Added a rain layer for atmosphere.

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "survive",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "main.go"
+        }        
+    ]
+}

assets/audiobank.go

@@ -0,0 +1,63 @@
+package assets
+
+import (
+	"bytes"
+	_ "embed"
+	"log"
+
+	"github.com/hajimehoshi/ebiten/v2/audio/wav"
+)
+
+type SndAssetName string
+
+const (
+	MainLoop SndAssetName = "MainLoop"
+	Explode  SndAssetName = "Explode"
+
+	sampleRate = 44100
+)
+
+var (
+	SoundBank map[SndAssetName]*wav.Stream
+
+	//go:embed loop.wav
+	mainloop_snd []byte
+	//go:embed explode.wav
+	explode_snd []byte
+
+	//go:embed explode.wav
+	Splode []byte
+	//go:embed hit.wav
+	TargetHit []byte
+	//go:embed herodeath.wav
+	HeroDeath []byte
+	//go:embed shot.wav
+	Shot []byte
+	//go:embed magic.wav
+	Magic []byte
+	//go:embed survive.wav
+	Survive []byte
+	//go:embed pausein.wav
+	PauseIn []byte
+	//go:embed pauseout.wav
+	PauseOut []byte
+	//go:embed flare.wav
+	Flare []byte
+)
+
+func LoadSounds() {
+	SoundBank = make(map[SndAssetName]*wav.Stream)
+
+	SoundBank[MainLoop] = LoadSoundFatal(sampleRate, mainloop_snd)
+	SoundBank[Explode] = LoadSoundFatal(sampleRate, explode_snd)
+}
+
+func LoadSoundFatal(rate int, obj []byte) *wav.Stream {
+
+	stream, err := wav.DecodeWithSampleRate(rate, bytes.NewReader(obj))
+	if err != nil {
+		log.Fatal("dead, jim")
+	}
+
+	return stream
+}

assets/imagebank.go

@@ -0,0 +1,107 @@
+package assets
+
+import (
+	"bytes"
+	"image"
+	"log"
+
+	_ "embed"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type ImgAssetName string
+
+const (
+	Title         ImgAssetName = "Title"
+	FlyEyeNormal  ImgAssetName = "FlyEyeNormal"
+	FlyEyeDamaged ImgAssetName = "FlyEyeDamaged"
+	FlyEyeDying   ImgAssetName = "FlyEyeDying"
+	FlyEyeShadow  ImgAssetName = "FlyEyeShadow"
+	HeroNormal    ImgAssetName = "HeroNormal"
+	HeroDying     ImgAssetName = "HeroDying"
+	TileSet       ImgAssetName = "TileSet"
+	Altar         ImgAssetName = "Altar"
+	Weapon        ImgAssetName = "Weapon"
+	WormDamaged   ImgAssetName = "WormDamaged"
+	Worm          ImgAssetName = "WormDefault"
+	Cloud         ImgAssetName = "Cloud"
+	Fireball      ImgAssetName = "Fireball"
+	Splash        ImgAssetName = "Splash"
+	LaserBeam     ImgAssetName = "LaserBeam"
+	ItemLaser     ImgAssetName = "ItemLaser"
+	RainSplash    ImgAssetName = "RainSplash"
+)
+
+var (
+	ImageBank map[ImgAssetName]*ebiten.Image
+
+	//go:embed title.png
+	title_img []byte
+	//go:embed fly-eye.png
+	flyeye_img []byte
+	//go:embed fly-eye2.png
+	flyeye_img2 []byte
+	//go:embed fly-eye3.png
+	flyeye_img3 []byte
+	//go:embed shadow.png
+	shadow_img []byte
+	//go:embed hero.png
+	hero_img []byte
+	//go:embed herodeath.png
+	herodeath_img []byte
+	//go:embed grasstile.png
+	tileset_img []byte
+	//go:embed altar.png
+	altar_img []byte
+	//go:embed weapon.png
+	weapon_img []byte
+	//go:embed worm.png
+	worm_img []byte
+	//go:embed wormdefault.png
+	wormdefault_img []byte
+	//go:embed cloud.png
+	cloud_img []byte
+	//go:embed hot.png
+	fireball_img []byte
+	//go:embed splash.png
+	splash_img []byte
+	//go:embed laserbeam.png
+	laserbeam_img []byte
+	//go:embed item-laser.png
+	itemlaser_img []byte
+	//go:embed rain-splash.png
+	rainsplash_img []byte
+)
+
+func LoadImages() {
+	ImageBank = make(map[ImgAssetName]*ebiten.Image)
+
+	ImageBank[Title] = LoadImagesFatal(title_img)
+	ImageBank[FlyEyeNormal] = LoadImagesFatal(flyeye_img)
+	ImageBank[FlyEyeDamaged] = LoadImagesFatal(flyeye_img2)
+	ImageBank[FlyEyeDying] = LoadImagesFatal(flyeye_img3)
+	ImageBank[FlyEyeShadow] = LoadImagesFatal(shadow_img)
+	ImageBank[HeroNormal] = LoadImagesFatal(hero_img)
+	ImageBank[HeroDying] = LoadImagesFatal(herodeath_img)
+	ImageBank[TileSet] = LoadImagesFatal(tileset_img)
+	ImageBank[Altar] = LoadImagesFatal(altar_img)
+	ImageBank[Weapon] = LoadImagesFatal(weapon_img)
+	ImageBank[WormDamaged] = LoadImagesFatal(worm_img)
+	ImageBank[Worm] = LoadImagesFatal(wormdefault_img)
+	ImageBank[Cloud] = LoadImagesFatal(cloud_img)
+	ImageBank[Fireball] = LoadImagesFatal(fireball_img)
+	ImageBank[Splash] = LoadImagesFatal(splash_img)
+	ImageBank[LaserBeam] = LoadImagesFatal(laserbeam_img)
+	ImageBank[ItemLaser] = LoadImagesFatal(itemlaser_img)
+	ImageBank[RainSplash] = LoadImagesFatal(rainsplash_img)
+
+}
+
+func LoadImagesFatal(b []byte) *ebiten.Image {
+	img, _, err := image.Decode(bytes.NewReader(b))
+	if err != nil {
+		log.Fatal(err)
+	}
+	return ebiten.NewImageFromImage(img)
+}

elements/boss.go

@@ -0,0 +1,130 @@
+package elements
+
+import (
+	"image"
+	"image/color"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Boss struct {
+	Sprite          *ebiten.Image
+	Maks            *ebiten.Image
+	MaskDest        *ebiten.Image
+	Spawned         bool
+	Pos             gamedata.Coordinates
+	Right           bool
+	Health          int
+	Touched         bool
+	damage          bool
+	cycle           int
+	Action          MoverAction
+	hitcount        int
+	damageduration  int
+	SplodeInitiated bool
+}
+
+func NewBoss() *Boss {
+	b := &Boss{
+		Sprite:   ebiten.NewImage(96, 96),
+		Spawned:  false,
+		Action:   MoverActionDefault,
+		hitcount: 0,
+		Maks:     ebiten.NewImage(96, 96),
+		MaskDest: ebiten.NewImage(96, 96),
+		Health:   100,
+		Touched:  false,
+	}
+	b.Maks.Fill(color.White)
+	return b
+}
+
+func (b *Boss) Update() {
+	if b.damage {
+		b.damageduration++
+		if b.damageduration > 30 {
+			b.damage = false
+			b.damageduration = 0
+		}
+	}
+	if b.Action == MoverActionDead {
+		b.Spawned = false
+	}
+	b.cycle++
+}
+
+func (b *Boss) Draw() {
+	b.Sprite.Clear()
+	b.MaskDest.Clear()
+
+	/*
+		//b.Sprite.Fill(color.RGBA{R: 0xFF, G: 0xFF, B: 0x00, A: 0xFF})
+		vector.DrawFilledCircle(b.Sprite, 48, 48, 48, color.RGBA{R: 0xFF, G: 0xFF, B: 0x00, A: 0xFF}, true)
+	*/
+
+	idx := (b.cycle / 8) % 4
+	x0 := 96 * idx
+	x1 := x0 + 96
+	y0 := 0
+	y1 := 96
+
+	op := &ebiten.DrawImageOptions{}
+	if b.Right {
+		op.GeoM.Scale(-1, 1)
+		op.GeoM.Translate(MOVER_WIDTH*2, 0)
+	}
+
+	switch b.Action {
+	case MoverActionDefault:
+		b.Sprite.DrawImage(assets.ImageBank[assets.Worm].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+	case MoverActionDamaged:
+		if (b.cycle/5)%2 == 0 && b.damage {
+			b.MaskDest.DrawImage(assets.ImageBank[assets.WormDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Reset()
+			op.Blend = ebiten.BlendSourceAtop
+			b.MaskDest.DrawImage(b.Maks, op)
+			b.Sprite.DrawImage(b.MaskDest, nil)
+		} else {
+			b.Sprite.DrawImage(assets.ImageBank[assets.WormDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		}
+	case MoverActionExploding:
+		op.GeoM.Scale(2, 2)
+		//op.GeoM.Translate(-48, -48)
+		b.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDying].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		if idx == 3 {
+			b.Action++
+		}
+	}
+
+}
+
+func (b *Boss) SetHit() {
+	b.hitcount++
+	b.damage = true
+	b.Health--
+
+	if b.Health <= 0 {
+		b.Action = MoverActionExploding
+		b.cycle = 0
+	}
+}
+
+func (b *Boss) Reset() {
+	b.hitcount = 0
+	b.damage = false
+	b.damageduration = 0
+	b.Action = MoverActionDefault
+	b.Spawned = false
+	b.Health = 100
+}
+
+func (b *Boss) ToggleColor() {
+	if b.Action == MoverActionDefault {
+		b.Action = MoverActionDamaged
+	} else if b.Action == MoverActionDamaged {
+		b.Action = MoverActionDefault
+	}
+}

elements/cloud.go

@@ -0,0 +1,62 @@
+package elements
+
+import (
+	"math"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Cloud struct {
+	Sprite   *ebiten.Image
+	position gamedata.Coordinates
+	angle    float64
+	velocity float64
+	Alpha    float64
+}
+
+func NewCloud(a gamedata.Area, angle, velocity float64) *Cloud {
+	c := &Cloud{
+		Sprite:   ebiten.NewImage(a.Width, a.Height),
+		angle:    angle, //rand.Float64() * (math.Pi * 2),
+		velocity: velocity,
+	}
+	return c
+}
+
+func (c *Cloud) Update() error {
+
+	c.position.X += c.velocity * math.Cos(c.angle)
+	c.position.Y += c.velocity * math.Sin(c.angle)
+	return nil
+}
+
+func (c *Cloud) Draw() {
+	c.Sprite.Clear()
+	//c.Sprite.Fill(color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff})
+	//c.Sprite.Fill(color.White)
+
+	cloudsprite := assets.ImageBank[assets.Cloud]
+
+	spritex := cloudsprite.Bounds().Dx()
+	spritey := cloudsprite.Bounds().Dy()
+
+	cloudx := c.Sprite.Bounds().Dx()
+	cloudy := c.Sprite.Bounds().Dy()
+
+	scalex := float64(cloudx) / float64(spritex)
+	scaley := float64(cloudy) / float64(spritey)
+
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Scale(scalex, scaley)
+	c.Sprite.DrawImage(assets.ImageBank[assets.Cloud], op)
+}
+
+func (c *Cloud) SetPosition(p gamedata.Coordinates) {
+	c.position = p
+}
+
+func (c *Cloud) GetPosition() gamedata.Coordinates {
+	return c.position
+}

elements/enemies.go

@@ -0,0 +1,28 @@
+package elements
+
+import (
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Enemies interface {
+	Update() error
+	Draw()
+	GetPosition() gamedata.Coordinates
+	SetPosition(gamedata.Coordinates)
+	SetTarget(gamedata.Coordinates)
+	GetSprite() *ebiten.Image
+	GetEnemyState() gamedata.EnemyState
+	SetHit()
+	SetToggle()
+	IsToggled() bool
+	SetTouched()
+	ClearTouched()
+	IsTouched() bool
+	ExplosionInitiated() bool
+	SetExplosionInitiated()
+	Health() int
+	MaxHealth() int
+	GetAngle() float64
+}

elements/explosion.go

@@ -1,8 +1,10 @@
-package main
+package elements
+
+import "mover/gamedata"
 
 type Explosion struct {
 	Radius float64
-	Origin Coordinates
+	Origin gamedata.Coordinates
 	cycle  int
 	Active bool
 }
@@ -27,7 +29,7 @@ func (e *Explosion) Update() {
 
 }
 
-func (e *Explosion) SetOrigin(origin Coordinates) {
+func (e *Explosion) SetOrigin(origin gamedata.Coordinates) {
 	e.Origin = origin
 }
 

elements/fireball.go

@@ -0,0 +1,118 @@
+package elements
+
+import (
+	"image"
+	"math"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type FireBall struct {
+	Sprite   *ebiten.Image
+	position gamedata.Coordinates
+	angle    float64
+	velocity float64
+	cycle    int
+}
+
+func NewFireBall(angle, velocity float64) *FireBall {
+	fb := &FireBall{
+		Sprite:   ebiten.NewImage(50, 50),
+		cycle:    0,
+		angle:    angle,
+		velocity: velocity,
+	}
+	return fb
+}
+
+func (fb *FireBall) Update() error {
+
+	fb.position.X += fb.velocity * math.Cos(fb.angle)
+	fb.position.Y += fb.velocity * math.Sin(fb.angle)
+
+	fb.cycle++
+	return nil
+}
+
+func (fb *FireBall) Draw() {
+	fb.Sprite.Clear()
+	//fb.Sprite.Fill(color.RGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff})
+
+	idx := fb.cycle / 8 % 5
+	x0 := idx * 50
+	x1 := x0 + 50
+	y0 := 0
+	y1 := 50
+
+	fb.Sprite.DrawImage(assets.ImageBank[assets.Fireball].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+}
+
+func (fb *FireBall) GetPosition() gamedata.Coordinates {
+	return fb.position
+}
+
+func (fb *FireBall) SetPosition(pos gamedata.Coordinates) {
+	fb.position = pos
+}
+
+func (fb *FireBall) SetTarget(gamedata.Coordinates) {
+
+}
+
+func (fb *FireBall) GetAngle() float64 {
+	return fb.angle
+}
+
+func (fb *FireBall) GetVelocity() float64 {
+	return fb.velocity
+}
+
+func (fb *FireBall) GetSprite() *ebiten.Image {
+	return fb.Sprite
+}
+
+func (fb *FireBall) ClearTouched() {
+
+}
+
+func (fb *FireBall) ExplosionInitiated() bool {
+	return false
+}
+
+func (fb *FireBall) GetEnemyState() gamedata.EnemyState {
+	return gamedata.EnemyStateDefault
+}
+
+func (fb *FireBall) SetHit() {
+
+}
+
+func (fb *FireBall) SetToggle() {
+
+}
+
+func (fb *FireBall) IsToggled() bool {
+	return false
+}
+
+func (fb *FireBall) SetTouched() {
+
+}
+
+func (fb *FireBall) IsTouched() bool {
+	return false
+}
+
+func (fb *FireBall) SetExplosionInitiated() {
+
+}
+
+func (fb *FireBall) Health() int {
+	return 0
+}
+
+func (fb *FireBall) MaxHealth() int {
+	return 1
+}

elements/flyeye.go

@@ -0,0 +1,180 @@
+package elements
+
+import (
+	"image"
+	"image/color"
+	"math"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type FlyEye struct {
+	Sprite     *ebiten.Image
+	Maks       *ebiten.Image
+	MaksDest   *ebiten.Image
+	position   gamedata.Coordinates
+	target     gamedata.Coordinates
+	state      gamedata.EnemyState
+	cycle      int
+	dyingcount int
+	health     int
+	hit        bool
+	touched    bool
+	toggle     bool
+	sploding   bool
+}
+
+func NewFlyEye() *FlyEye {
+	f := &FlyEye{
+		Sprite:     ebiten.NewImage(46, 46),
+		Maks:       ebiten.NewImage(48, 48),
+		MaksDest:   ebiten.NewImage(48, 48),
+		health:     0,
+		cycle:      0,
+		dyingcount: 0,
+		hit:        false,
+		touched:    false,
+		toggle:     false,
+		sploding:   false,
+	}
+	f.Maks.Fill(color.White)
+	return f
+}
+
+func (f *FlyEye) Update() error {
+
+	//close loop on target
+	if f.state <= gamedata.EnemyStateHit {
+		dx := f.target.X - f.position.X
+		dy := f.target.Y - f.position.Y
+		if math.Abs(dx) > 3 || math.Abs(dy) > 3 {
+			angle := math.Atan2(dy, dx)
+
+			f.position.X += math.Cos(angle) * 3
+			f.position.Y += math.Sin(angle) * 3
+		}
+	}
+
+	if f.state == gamedata.EnemyStateDying {
+		f.dyingcount++
+	}
+
+	f.cycle++
+
+	return nil
+}
+
+func (f *FlyEye) Draw() {
+	f.Sprite.Clear()
+	f.MaksDest.Clear()
+
+	idx := (f.cycle / 8) % 4
+
+	y0 := 0
+	y1 := 48
+	x0 := 48 * idx
+	x1 := x0 + 48
+
+	switch f.state {
+	case gamedata.EnemyStateDefault:
+		if !f.toggle {
+			f.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeNormal].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		} else {
+			f.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		}
+	case gamedata.EnemyStateDying:
+		//after some condition, set to exploding
+		if (f.cycle/5)%2 == 0 {
+
+			f.MaksDest.DrawImage(assets.ImageBank[assets.FlyEyeDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Reset()
+			op.Blend = ebiten.BlendSourceAtop
+			f.MaksDest.DrawImage(f.Maks, op)
+			f.Sprite.DrawImage(f.MaksDest, nil)
+
+		} else {
+			f.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		}
+		if f.dyingcount >= 31 {
+			f.cycle = 0
+			f.state = gamedata.EnemyStateExploding
+		}
+	case gamedata.EnemyStateExploding:
+		f.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDying].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		if idx == 3 {
+			f.state = gamedata.EnemyStateDead
+		}
+	}
+}
+
+func (f *FlyEye) GetPosition() gamedata.Coordinates {
+	return f.position
+}
+
+func (f *FlyEye) SetTarget(p gamedata.Coordinates) {
+	f.target = p
+}
+
+func (f *FlyEye) GetSprite() *ebiten.Image {
+	return f.Sprite
+}
+
+func (f *FlyEye) SetHit() {
+	f.hit = true
+	f.state = gamedata.EnemyStateDying
+	f.cycle = 0
+	f.health--
+}
+
+func (f *FlyEye) IsTouched() bool {
+	return f.touched
+}
+
+func (f *FlyEye) SetTouched() {
+	f.touched = true
+}
+
+func (f *FlyEye) ClearTouched() {
+	f.touched = false
+}
+
+func (f *FlyEye) SetToggle() {
+	f.toggle = !f.toggle
+}
+
+func (f *FlyEye) IsToggled() bool {
+	return f.toggle
+}
+
+func (f *FlyEye) GetEnemyState() gamedata.EnemyState {
+	return f.state
+}
+
+func (f *FlyEye) SetPosition(p gamedata.Coordinates) {
+	f.position = p
+}
+
+func (f *FlyEye) ExplosionInitiated() bool {
+	return f.sploding
+}
+
+func (f *FlyEye) SetExplosionInitiated() {
+	f.sploding = true
+}
+
+func (f *FlyEye) Health() int {
+	//health bars reserved for special enemies, flyeye is a one
+	//hitter so returning zero ensure no health bar is rendered
+	return f.health
+}
+
+func (f *FlyEye) MaxHealth() int {
+	return 1
+}
+
+func (f *FlyEye) GetAngle() float64 {
+	return 0
+}

elements/flygoblin.go

@@ -0,0 +1,218 @@
+package elements
+
+import (
+	"image"
+	"image/color"
+	"math/rand/v2"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const (
+	FG_MAXHEALTH = 100
+)
+
+type FlyGoblin struct {
+	Sprite           *ebiten.Image
+	Maks             *ebiten.Image
+	MaksDest         *ebiten.Image
+	position         gamedata.Coordinates
+	target           gamedata.Coordinates
+	state            gamedata.EnemyState
+	cycle            int
+	health           int
+	damageduration   int
+	right            bool
+	touched          bool
+	toggle           bool
+	sploding         bool
+	damage           bool
+	called           bool
+	deathcallback    func()
+	fireballcallback func()
+}
+
+func NewFlyGoblin() *FlyGoblin {
+	fg := &FlyGoblin{
+		Sprite:         ebiten.NewImage(96, 96),
+		Maks:           ebiten.NewImage(96, 96),
+		MaksDest:       ebiten.NewImage(96, 96),
+		health:         FG_MAXHEALTH,
+		damageduration: 0,
+		called:         false,
+	}
+	fg.Maks.Fill(color.White)
+	return fg
+}
+
+func (f *FlyGoblin) Update() error {
+
+	if f.damage {
+		f.damageduration++
+		if f.damageduration > 30 {
+			f.damage = false
+			f.damageduration = 0
+		}
+	}
+
+	if f.state < gamedata.EnemyStateDying {
+		dx := f.target.X - f.position.X
+		dy := f.target.Y - f.position.Y
+
+		f.right = dx/48 > 0
+
+		f.position.X += dx / 48
+		f.position.Y += dy / 48
+
+		//10% chance to summon fireball
+		fb := rand.Float64() >= 0.9
+
+		if (f.cycle/8)%4 == 0 && fb {
+			if f.fireballcallback != nil {
+				f.fireballcallback()
+			}
+		}
+
+	}
+
+	if f.state == gamedata.EnemyStateDead && !f.called {
+		f.called = true
+		if f.deathcallback != nil {
+			f.deathcallback()
+		}
+	}
+
+	f.cycle++
+	return nil
+}
+
+func (f *FlyGoblin) Draw() {
+	f.Sprite.Clear()
+	f.MaksDest.Clear()
+
+	idx := (f.cycle / 8) % 4
+	x0 := 96 * idx
+	x1 := x0 + 96
+	y0 := 0
+	y1 := 96
+
+	op := &ebiten.DrawImageOptions{}
+	if f.right {
+		op.GeoM.Scale(-1, 1)
+		op.GeoM.Translate(MOVER_WIDTH*2, 0)
+	}
+
+	switch f.state {
+	case gamedata.EnemyStateDefault:
+		if !f.toggle {
+			f.Sprite.DrawImage(assets.ImageBank[assets.Worm].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		} else {
+			f.Sprite.DrawImage(assets.ImageBank[assets.WormDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		}
+	case gamedata.EnemyStateHit:
+		if (f.cycle/5)%2 == 0 && f.damage {
+			f.MaksDest.DrawImage(assets.ImageBank[assets.WormDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Reset()
+			op.Blend = ebiten.BlendSourceAtop
+			f.MaksDest.DrawImage(f.Maks, op)
+			f.Sprite.DrawImage(f.MaksDest, nil)
+		} else {
+			f.Sprite.DrawImage(assets.ImageBank[assets.WormDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		}
+	case gamedata.EnemyStateExploding:
+		op.GeoM.Scale(2, 2)
+		//op.GeoM.Translate(-48, -48)
+		f.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDying].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		if idx == 3 {
+			f.state = gamedata.EnemyStateDead
+
+		}
+	}
+
+}
+
+func (f *FlyGoblin) GetPosition() gamedata.Coordinates {
+	return f.position
+}
+
+func (f *FlyGoblin) SetPosition(pos gamedata.Coordinates) {
+	f.position = pos
+}
+
+func (f *FlyGoblin) SetTarget(target gamedata.Coordinates) {
+	f.target = target
+}
+
+func (f *FlyGoblin) GetSprite() *ebiten.Image {
+	return f.Sprite
+}
+
+func (f *FlyGoblin) GetEnemyState() gamedata.EnemyState {
+	return f.state
+}
+
+func (f *FlyGoblin) SetHit() {
+	f.health--
+	f.damage = true
+	f.state = gamedata.EnemyStateHit
+
+	if f.health <= 0 {
+		f.state = gamedata.EnemyStateExploding
+		f.cycle = 0
+	}
+}
+
+func (f *FlyGoblin) SetToggle() {
+	f.toggle = !f.toggle
+
+	if !f.toggle {
+		f.state = gamedata.EnemyStateDefault
+	}
+}
+
+func (f *FlyGoblin) IsToggled() bool {
+	return f.toggle
+}
+
+func (f *FlyGoblin) SetTouched() {
+	f.touched = true
+}
+
+func (f *FlyGoblin) ClearTouched() {
+	f.touched = false
+}
+
+func (f *FlyGoblin) IsTouched() bool {
+	return f.touched
+}
+
+func (f *FlyGoblin) ExplosionInitiated() bool {
+	return f.sploding
+}
+
+func (f *FlyGoblin) SetExplosionInitiated() {
+	f.sploding = true
+}
+
+func (f *FlyGoblin) Health() int {
+	return f.health
+}
+
+func (f *FlyGoblin) MaxHealth() int {
+	return FG_MAXHEALTH
+}
+
+func (f *FlyGoblin) SetDeathEvent(somefunc func()) {
+	f.deathcallback = somefunc
+}
+
+func (f *FlyGoblin) SetFireballCallback(somefunc func()) {
+	f.fireballcallback = somefunc
+}
+
+func (f *FlyGoblin) GetAngle() float64 {
+	return 0
+}

elements/hero.go

@@ -1,9 +1,9 @@
-package main
+package elements
 
 import (
-	"bytes"
 	"image"
-	"log"
+	"mover/assets"
+	"mover/gamedata"
 
 	_ "embed"
 	"image/color"
@@ -12,15 +12,9 @@ import (
 	"github.com/hajimehoshi/ebiten/v2"
 )
 
-var (
-	heroImage *ebiten.Image
-	heroDeath *ebiten.Image
-
-	//go:embed hero.png
-	hero_img []byte
-
-	//go:embed herodeath.png
-	herodeath_img []byte
+const (
+	MOVER_WIDTH  = 48
+	MOVER_HEIGHT = 48
 )
 
 const (
@@ -34,47 +28,37 @@ const (
 
 type HeroAction uint
 
-func init() {
-	img, _, err := image.Decode(bytes.NewReader(hero_img))
-	if err != nil {
-		log.Fatal(err)
-	}
-	heroImage = ebiten.NewImageFromImage(img)
-
-	img, _, err = image.Decode(bytes.NewReader(herodeath_img))
-	if err != nil {
-		log.Fatal(err)
-	}
-	heroDeath = ebiten.NewImageFromImage(img)
-}
-
 type Hero struct {
 	Sprite     *ebiten.Image
 	Maks       *ebiten.Image
 	MaksDest   *ebiten.Image
 	Angle      float64
-	Pos        Coordinates
-	Origin     Coordinates
+	Pos        gamedata.Coordinates
+	Origin     gamedata.Coordinates
+	Lastpos    gamedata.Coordinates
 	Action     HeroAction
 	cycles     int
+	Upgrade    bool
 	rotating   bool
 	Toggled    bool
 	Hit        bool
 	Touched    bool
+	Left       bool
 	dyingcount int
 }
 
 func NewHero() *Hero {
 	m := &Hero{
-		Sprite:     ebiten.NewImage(48, 48),
-		Maks:       ebiten.NewImage(48, 48),
-		MaksDest:   ebiten.NewImage(48, 48),
+		Sprite:     ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT),
+		Maks:       ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT),
+		MaksDest:   ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT),
 		Action:     HeroActionDefault,
 		cycles:     4,
 		Angle:      0,
 		rotating:   false,
 		Toggled:    false,
 		dyingcount: 0,
+		Upgrade:    true,
 	}
 
 	m.Maks.Fill(color.White)
@@ -89,7 +73,7 @@ func (m *Hero) SetAngle(a float64) {
 	m.Angle = a
 }
 
-func (m *Hero) SetOrigin(coords Coordinates) {
+func (m *Hero) SetOrigin(coords gamedata.Coordinates) {
 	m.Origin = coords
 	m.Pos = coords
 }
@@ -105,18 +89,24 @@ func (m *Hero) Draw() {
 	x0 := 48 * idx
 	x1 := x0 + 48
 
+	op := &ebiten.DrawImageOptions{}
+	if m.Left {
+		op.GeoM.Scale(-1, 1)
+		op.GeoM.Translate(MOVER_WIDTH, 0)
+	}
+
 	switch m.Action {
 	case HeroActionDefault:
-		m.Sprite.DrawImage(heroImage.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		m.Sprite.DrawImage(assets.ImageBank[assets.HeroNormal].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
 	case HeroActionDying:
-		m.Sprite.DrawImage(heroDeath.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		m.Sprite.DrawImage(assets.ImageBank[assets.HeroDying].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
 
 		if m.dyingcount >= 31 {
 			m.cycles = 0
 			m.Action++
 		}
 	case HeroActionExploding:
-		m.Sprite.DrawImage(heroDeath.SubImage(image.Rect(48*3, 0, 48*4, 48)).(*ebiten.Image), nil)
+		m.Sprite.DrawImage(assets.ImageBank[assets.HeroDying].SubImage(image.Rect(48*3, 0, 48*4, 48)).(*ebiten.Image), op)
 	default:
 	}
 }
@@ -131,7 +121,7 @@ func (m *Hero) Update() {
 
 // one hit death for the hero
 func (m *Hero) SetHit() {
-	m.Action = MoverActionDying
+	m.Action = HeroActionDying
 	m.dyingcount = 0
 	m.Angle = 0
 	m.cycles = 0

elements/laser.go

@@ -0,0 +1,72 @@
+package elements
+
+import (
+	"image"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Laser struct {
+	Sprite    *ebiten.Image
+	position  gamedata.Coordinates
+	angle     float64
+	cycle     int
+	firing    bool
+	numcycles int
+}
+
+func NewLaser(pos gamedata.Coordinates, angle float64) *Laser {
+	l := &Laser{
+		Sprite:    ebiten.NewImage(200, 20),
+		angle:     angle,
+		cycle:     0,
+		position:  pos,
+		firing:    false,
+		numcycles: 5,
+	}
+	return l
+}
+
+func (l *Laser) Update() error {
+	l.cycle++
+	return nil
+}
+
+func (l *Laser) Draw() {
+	l.Sprite.Clear()
+	//l.Sprite.Fill(color.White)
+
+	idx := (l.cycle / 4) % l.numcycles
+	x0 := 0
+	y0 := 20 * idx
+	x1 := 200
+	y1 := y0 + 20
+
+	l.Sprite.DrawImage(assets.ImageBank[assets.LaserBeam].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+
+}
+
+func (l *Laser) GetPosition() gamedata.Coordinates {
+	return l.position
+}
+
+func (l *Laser) SetPosition(pos gamedata.Coordinates) {
+	l.position = pos
+}
+func (l *Laser) GetAngle() float64 {
+	return l.angle
+}
+
+func (l *Laser) SetAngle(a float64) {
+	l.angle = a
+}
+
+func (l *Laser) SetFiring(b bool) {
+	l.firing = b
+}
+
+func (l *Laser) IsFiring() bool {
+	return l.firing
+}

elements/mover.go

@@ -0,0 +1,147 @@
+package elements
+
+import (
+	"image"
+	"mover/assets"
+	"mover/gamedata"
+
+	_ "embed"
+	"image/color"
+	_ "image/png"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const (
+	MoverActionDefault = iota
+	MoverActionDamaged
+	MoverActionDying
+	MoverActionExploding
+	MoverActionDead
+	MoverActionMax
+)
+
+type MoverAction uint
+
+type Mover struct {
+	Sprite          *ebiten.Image
+	Maks            *ebiten.Image
+	MaksDest        *ebiten.Image
+	Angle           float64
+	Pos             gamedata.Coordinates
+	Origin          gamedata.Coordinates
+	Action          MoverAction
+	cycles          int
+	rotating        bool
+	Toggled         bool
+	Hit             bool
+	Touched         bool
+	SplodeInitiated bool
+	dyingcount      int
+}
+
+func NewMover() *Mover {
+	m := &Mover{
+		Sprite:          ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT),
+		Maks:            ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT),
+		MaksDest:        ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT),
+		Action:          MoverActionDefault,
+		cycles:          4,
+		Angle:           0,
+		rotating:        false,
+		Toggled:         false,
+		dyingcount:      0,
+		SplodeInitiated: false,
+	}
+
+	m.Maks.Fill(color.White)
+	return m
+}
+
+func (m *Mover) ToggleRotate() {
+	m.rotating = !m.rotating
+}
+
+func (m *Mover) SetAngle(a float64) {
+	m.Angle = a
+}
+
+func (m *Mover) SetOrigin(coords gamedata.Coordinates) {
+	m.Origin = coords
+	m.Pos = coords
+}
+
+func (m *Mover) Draw() {
+	m.Sprite.Clear()
+	m.MaksDest.Clear()
+
+	idx := (m.cycles / 8) % 4
+
+	y0 := 0
+	y1 := 48
+	x0 := 48 * idx
+	x1 := x0 + 48
+
+	switch m.Action {
+	case MoverActionDefault:
+		m.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeNormal].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+	case MoverActionDamaged:
+		m.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+	case MoverActionDying:
+
+		if (m.cycles/5)%2 == 0 {
+
+			m.MaksDest.DrawImage(assets.ImageBank[assets.FlyEyeDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Reset()
+			op.Blend = ebiten.BlendSourceAtop
+			m.MaksDest.DrawImage(m.Maks, op)
+			m.Sprite.DrawImage(m.MaksDest, nil)
+
+		} else {
+			m.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDamaged].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		}
+		if m.dyingcount >= 31 {
+			m.cycles = 0
+			m.SetHit()
+		}
+	case MoverActionExploding:
+		m.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeDying].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+		if idx == 3 {
+			m.SetHit()
+		}
+	default:
+	}
+}
+
+func (m *Mover) Update() error {
+	/*
+		dx := 0. //40 * math.Cos(float64(m.cycles)/16)
+		dy := 0. //40 * math.Sin(float64(m.cycles)/16)
+
+		m.Pos = Coordinates{X: m.Origin.X + dx, Y: m.Origin.Y + dy}
+	*/
+	/*
+		if m.rotating {
+			m.Angle = float64(m.cycles) / (math.Pi * 2)
+		}
+	*/
+	if m.Action == MoverActionDying {
+		m.dyingcount++
+	}
+	m.cycles++
+	return nil
+}
+
+func (m *Mover) SetHit() {
+	m.Action++ // = (m.Action + 1) % MoverActionMax
+}
+
+func (m *Mover) ToggleColor() {
+	//m.Toggled = !m.Toggled
+	if m.Action == MoverActionDefault {
+		m.Action = MoverActionDamaged
+	} else if m.Action == MoverActionDamaged {
+		m.Action = MoverActionDefault
+	}
+}

elements/projectile.go

@@ -1,14 +1,17 @@
-package main
+package elements
 
-import "math"
+import (
+	"math"
+	"mover/gamedata"
+)
 
 type Projectile struct {
-	Pos      Coordinates
+	Pos      gamedata.Coordinates
 	Velocity float64
 	a        float64
 }
 
-func NewProjectile(origin Coordinates, angle, velocity float64) *Projectile {
+func NewProjectile(origin gamedata.Coordinates, angle, velocity float64) *Projectile {
 	return &Projectile{
 		Velocity: velocity,
 		a:        angle,

elements/raindrop.go

@@ -0,0 +1,46 @@
+package elements
+
+import (
+	"image/color"
+	"math/rand/v2"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type RainDrop struct {
+	Sprite   *ebiten.Image
+	position gamedata.Coordinates
+	cycle    int
+}
+
+func NewRainDrop() *RainDrop {
+	rd := &RainDrop{
+		Sprite: ebiten.NewImage(2, 10),
+		cycle:  rand.IntN(30),
+	}
+	return rd
+}
+
+func (rd *RainDrop) Update() error {
+	rd.position.Y += 5
+	rd.cycle++
+	return nil
+}
+
+func (rd *RainDrop) Draw() {
+	rd.Sprite.Clear()
+	rd.Sprite.Fill(color.White)
+}
+
+func (rd *RainDrop) GetPosition() gamedata.Coordinates {
+	return rd.position
+}
+
+func (rd *RainDrop) SetPosition(pos gamedata.Coordinates) {
+	rd.position = pos
+}
+
+func (rd *RainDrop) Expired() bool {
+	return rd.cycle > 30
+}

elements/rainsplash.go

@@ -0,0 +1,58 @@
+package elements
+
+import (
+	"image"
+	"math/rand/v2"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type RainSplash struct {
+	Sprite   *ebiten.Image
+	position gamedata.Coordinates
+	cycle    int
+	counter  int
+}
+
+func NewRainSplash() *RainSplash {
+	rd := &RainSplash{
+		Sprite:  ebiten.NewImage(10, 4),
+		cycle:   rand.IntN(4),
+		counter: 0,
+	}
+	return rd
+}
+
+func (rd *RainSplash) Update() error {
+	rd.counter++
+	rd.cycle++
+	return nil
+}
+
+func (rd *RainSplash) Draw() {
+	rd.Sprite.Clear()
+	//rd.Sprite.Fill(color.White)
+
+	idx := (rd.cycle / 8) % 4
+	x0 := idx * 10
+	y0 := 0
+	x1 := x0 + 10
+	y1 := 4
+
+	rd.Sprite.DrawImage(assets.ImageBank[assets.RainSplash].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
+
+}
+
+func (rd *RainSplash) GetPosition() gamedata.Coordinates {
+	return rd.position
+}
+
+func (rd *RainSplash) SetPosition(pos gamedata.Coordinates) {
+	rd.position = pos
+}
+
+func (rd *RainSplash) Expired() bool {
+	return rd.counter > 30
+}

elements/splash.go

@@ -0,0 +1,112 @@
+package elements
+
+import (
+	"math"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const (
+	SPLASH_DIM          = 128
+	SPLASH_ELEMS        = 10
+	SPLASH_PRIMARY_SIZE = 46
+)
+
+type Splash struct {
+	Sprite   *ebiten.Image
+	position gamedata.Coordinates
+	cycle    int
+	opacity  float32
+}
+
+func NewSplash() *Splash {
+	sp := &Splash{
+		Sprite:  ebiten.NewImage(SPLASH_DIM, SPLASH_DIM),
+		cycle:   0,
+		opacity: 1,
+	}
+	return sp
+}
+
+func (sp *Splash) Update() error {
+	sp.cycle++
+
+	sp.opacity = sp.opacity - float32(sp.cycle)/(60*60)
+
+	return nil
+}
+
+func (sp *Splash) Draw() {
+	sp.Sprite.Clear()
+
+	/*
+		for i := SPLASH_ELEMS; i > 0; i-- {
+
+			percent := float64(i) / SPLASH_ELEMS
+
+			dx := 1 / percent * math.Cos(float64(sp.cycle)/(math.Pi*2))
+			dy := -float64(i - SPLASH_ELEMS) //math.Sin(float64(sp.cycle) / (math.Pi * 2))
+
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Translate(-SPLASH_DIM/2, -SPLASH_DIM/2)
+			op.GeoM.Scale(percent, percent)
+			//op.GeoM.Rotate(-(float64(sp.cycle - i*30)) / (math.Pi * 2))
+			op.GeoM.Translate(SPLASH_DIM/2+dx, SPLASH_DIM/2+dy)
+			//op.ColorScale.ScaleAlpha(float32(percent))
+			sp.Sprite.DrawImage(assets.ImageBank[assets.Splash], op)
+		}*/
+
+	for i := 0; i < SPLASH_ELEMS; i++ {
+
+		percent := float64(SPLASH_ELEMS-i) / SPLASH_ELEMS
+
+		dy := -float64(i)*4 - float64(sp.cycle)/60
+		dx := 2 / percent * math.Cos(float64(sp.cycle-i*10)/(math.Pi*2))
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(-48/2, -48/2)
+		op.GeoM.Scale(percent, percent)
+		op.GeoM.Rotate(-float64(sp.cycle) / (math.Pi * 4))
+		op.GeoM.Translate(SPLASH_DIM/2, SPLASH_DIM/2)
+		op.GeoM.Translate(dx, dy)
+
+		op.ColorScale.ScaleAlpha(sp.opacity)
+
+		sp.Sprite.DrawImage(assets.ImageBank[assets.Splash], op)
+	}
+
+	for i := 0; i < 5; i++ {
+
+		percent := float64(5-i) / 5
+
+		a := 9.8
+		time := float64(sp.cycle) / 8
+		v0 := 10.
+		dy := 1/2.*a*math.Pow(time-float64(i), 2) - v0*time
+		dx := -float64(sp.cycle)
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(-48/2, -48/2)
+		op.GeoM.Scale(percent, percent)
+		op.GeoM.Rotate(-float64(sp.cycle) / (math.Pi * 4))
+		op.GeoM.Translate(SPLASH_DIM/2, SPLASH_DIM/2)
+		op.GeoM.Translate(dx, dy)
+		sp.Sprite.DrawImage(assets.ImageBank[assets.Splash], op)
+		op.GeoM.Translate(-2*dx, 0)
+		sp.Sprite.DrawImage(assets.ImageBank[assets.Splash], op)
+	}
+}
+
+func (sp *Splash) GetPosition() gamedata.Coordinates {
+	return sp.position
+}
+
+func (sp *Splash) SetPosition(pos gamedata.Coordinates) {
+	sp.position = pos
+}
+
+func (sp *Splash) GetAlpha() float32 {
+	return sp.opacity
+}

elements/weapondrop.go

@@ -0,0 +1,66 @@
+package elements
+
+import (
+	"math"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type WeaponDrop struct {
+	Sprite     *ebiten.Image
+	position   gamedata.Coordinates
+	weapontype gamedata.WeaponType
+	cycle      int
+	collected  bool
+}
+
+func NewWeaponDrop(wt gamedata.WeaponType) *WeaponDrop {
+	wp := &WeaponDrop{
+		Sprite:     ebiten.NewImage(32, 32),
+		weapontype: wt,
+		cycle:      0,
+		collected:  false,
+	}
+	return wp
+}
+
+func (wp *WeaponDrop) SetPosition(pos gamedata.Coordinates) {
+	wp.position = pos
+}
+
+func (wp *WeaponDrop) GetPosition() gamedata.Coordinates {
+	return wp.position
+}
+
+func (wp *WeaponDrop) GetWeaponType() gamedata.WeaponType {
+	return wp.weapontype
+}
+
+func (wp *WeaponDrop) Update() error {
+	wp.cycle++
+	return nil
+}
+
+func (wp *WeaponDrop) Draw() {
+	wp.Sprite.Clear()
+
+	dy := 2 * math.Sin(float64(wp.cycle)/(math.Pi*2))
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Translate(0, dy)
+
+	switch wp.weapontype {
+	case gamedata.WeaponTypeLaser:
+		wp.Sprite.DrawImage(assets.ImageBank[assets.ItemLaser], op)
+	}
+
+}
+
+func (wp *WeaponDrop) SetCollected(c bool) {
+	wp.collected = c
+}
+
+func (wp *WeaponDrop) IsCollected() bool {
+	return wp.collected
+}

fonts/fonts.go

@@ -12,13 +12,14 @@ import (
 )
 
 const (
-	FontDPI            = 72
-	FontSizeStandard   = 16
-	FontSizeLarge      = 24
-	FontSizeBig        = 60
-	FontSizeArcade     = 12
-	FontSizeArcadeBig  = 40
-	FontSizeArcadeHuge = 80
+	FontDPI             = 72
+	FontSizeStandard    = 16
+	FontSizeLarge       = 24
+	FontSizeBig         = 60
+	FontSizeArcadeSmall = 8
+	FontSizeArcade      = 12
+	FontSizeArcadeBig   = 40
+	FontSizeArcadeHuge  = 80
 )
 
 type FontStruct struct {
@@ -29,6 +30,7 @@ type FontStruct struct {
 	Arcade      font.Face
 	ArcadeLarge font.Face
 	ArcadeHuge  font.Face
+	ArcadeSmall font.Face
 }
 
 var (
@@ -82,4 +84,5 @@ func init() {
 	SurviveFont.Arcade = GetFaceFatal(fnt3, FontDPI, FontSizeArcade)
 	SurviveFont.ArcadeLarge = GetFaceFatal(fnt3, FontDPI, FontSizeArcadeBig)
 	SurviveFont.ArcadeHuge = GetFaceFatal(fnt3, FontDPI, FontSizeArcadeHuge)
+	SurviveFont.ArcadeSmall = GetFaceFatal(fnt3, FontDPI, FontSizeArcadeSmall)
 }

game.go

@@ -1,487 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"image"
-	"image/color"
-	"log"
-	"math"
-	"math/rand/v2"
-	"mover/fonts"
-
-	_ "embed"
-
-	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/hajimehoshi/ebiten/v2/inpututil"
-	"github.com/hajimehoshi/ebiten/v2/text"
-	"github.com/hajimehoshi/ebiten/v2/vector"
-)
-
-const (
-	MOVER_WIDTH  = 48
-	MOVER_HEIGHT = 48
-)
-
-var (
-	tilesetImage *ebiten.Image
-	altarImage   *ebiten.Image
-
-	//go:embed grasstile.png
-	tileset_img []byte
-	//go:embed altar.png
-	altar_img []byte
-)
-
-type Game struct {
-	background        *ebiten.Image
-	collisionMask     *ebiten.Image
-	projectileMask    *ebiten.Image
-	heroCollisionMask *ebiten.Image
-	heroCollisionCpy  *ebiten.Image
-
-	Pos         Coordinates
-	Paused      bool
-	initialized bool
-	gameover    bool
-	reset       bool
-	runtime     float64
-	hero        *Hero
-	projectiles map[int]*Projectile
-	explosion   *Explosion
-
-	score   int
-	counter int
-	timer   int
-	targets []*Mover
-
-	gamepadIDsBuf []ebiten.GamepadID
-	gamepadIDs    map[ebiten.GamepadID]struct{}
-	//axes           map[ebiten.GamepadID][]string
-	//pressedButtons map[ebiten.GamepadID][]string
-}
-
-func init() {
-	img, _, err := image.Decode(bytes.NewReader(tileset_img))
-	if err != nil {
-		log.Fatal(err)
-	}
-	tilesetImage = ebiten.NewImageFromImage(img)
-
-	img, _, err = image.Decode(bytes.NewReader(altar_img))
-	if err != nil {
-		log.Fatal(err)
-	}
-	altarImage = ebiten.NewImageFromImage(img)
-}
-
-func (g *Game) Initialize() {
-
-	origin := Coordinates{X: 640 / 2, Y: 480 / 2}
-
-	g.ConstructBackground()
-	g.hero = NewHero()
-	g.hero.SetOrigin(origin)
-	g.hero.ToggleRotate()
-
-	g.gameover = false
-
-	g.collisionMask = ebiten.NewImage(screenWidth, screenHeight)
-	g.projectileMask = ebiten.NewImage(screenWidth, screenHeight)
-	g.heroCollisionMask = ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT)
-	g.heroCollisionCpy = ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT)
-
-	g.explosion = NewExplosion()
-	g.explosion.SetOrigin(origin)
-	g.score = 0
-	g.reset = false
-
-	//clean up all targets
-	for j := 0; j < len(g.targets); j++ {
-		g.targets[j] = nil
-	}
-	g.targets = g.targets[:0]
-
-	g.score = 0
-	g.counter = 0
-	g.timer = 0
-	g.runtime = 0.
-
-	g.projectiles = make(map[int]*Projectile)
-	g.initialized = true
-	g.reset = false
-
-}
-
-func (g *Game) Update() error {
-
-	if g.gamepadIDs == nil {
-		g.gamepadIDs = map[ebiten.GamepadID]struct{}{}
-	}
-
-	g.gamepadIDsBuf = inpututil.AppendJustConnectedGamepadIDs(g.gamepadIDsBuf[:0])
-	for _, id := range g.gamepadIDsBuf {
-		log.Printf("gamepad connected: id: %d, SDL ID: %s", id, ebiten.GamepadSDLID(id))
-		g.gamepadIDs[id] = struct{}{}
-	}
-	for id := range g.gamepadIDs {
-		if inpututil.IsGamepadJustDisconnected(id) {
-			log.Printf("gamepad disconnected: id: %d", id)
-			delete(g.gamepadIDs, id)
-		}
-	}
-
-	if !g.initialized || g.reset {
-		g.Initialize()
-	} else {
-		g.StepGame()
-	}
-
-	g.timer++
-
-	return nil
-}
-
-func (g *Game) Draw(screen *ebiten.Image) {
-
-	screen.Clear()
-	screen.DrawImage(g.background, nil)
-
-	g.hero.Draw()
-
-	op := &ebiten.DrawImageOptions{}
-
-	if !g.gameover {
-		g.runtime = float64(g.counter) / 60.
-	}
-
-	s := fmt.Sprintf("%02.3f", g.runtime)
-	if !g.gameover {
-		text.Draw(screen, "TIME: "+s, fonts.SurviveFont.Arcade, 640/2-250, 25, color.White)
-		text.Draw(screen, fmt.Sprintf("SCORE: %d", g.score*10), fonts.SurviveFont.Arcade, 640/2+100, 25, color.White)
-	} else {
-		if (g.counter/30)%2 == 0 {
-			text.Draw(screen, "TIME: "+s, fonts.SurviveFont.Arcade, 640/2-250, 25, color.White)
-			text.Draw(screen, fmt.Sprintf("SCORE: %d", g.score*10), fonts.SurviveFont.Arcade, 640/2+100, 25, color.White)
-		}
-	}
-
-	op.GeoM.Translate(-MOVER_WIDTH/2, -MOVER_HEIGHT/2)
-	op.GeoM.Rotate(g.hero.Angle)
-	op.GeoM.Translate(g.hero.Pos.X, g.hero.Pos.Y)
-	screen.DrawImage(g.hero.Sprite, op)
-
-	for _, target := range g.targets {
-		target.Draw()
-
-		op.GeoM.Reset()
-		op.GeoM.Translate(-MOVER_WIDTH/2, -MOVER_HEIGHT/2)
-		op.GeoM.Rotate(target.Angle)
-		op.GeoM.Translate(target.Pos.X, target.Pos.Y)
-		screen.DrawImage(target.Sprite, op)
-	}
-
-	g.projectileMask.Clear()
-
-	//ebitenutil.DrawCircle()
-	for _, p := range g.projectiles {
-		//vector.DrawFilledCircle(screen, float32(p.Pos.X), float32(p.Pos.Y), 3, color.White, true)
-		vector.DrawFilledCircle(g.projectileMask, float32(p.Pos.X), float32(p.Pos.Y), 3, color.White, true)
-	}
-
-	screen.DrawImage(g.projectileMask, nil)
-
-	vector.StrokeCircle(screen, float32(g.explosion.Origin.X), float32(g.explosion.Origin.Y), float32(g.explosion.Radius), 3, color.White, true)
-
-	/*for _, gamepad 	ebiten.StandardGamepadAxisValue(id, ebiten.StandardGamepadAxisRightStickHorizontal),
-	ebiten.StandardGamepadAxisValue(id, ebiten.StandardGamepadAxisRightStickVertical))*/
-
-}
-
-func (g *Game) Layout(width, height int) (int, int) {
-	return screenWidth, screenHeight
-}
-
-func (g *Game) CleanupTargets() {
-	// remove dead targets by 1) iterating over all targets
-	i := 0
-	for _, target := range g.targets {
-		//moving valid targets to the front of the slice
-		if target.Action < MoverActionDead {
-			g.targets[i] = target
-			i++
-		}
-	}
-
-	//then culling the last elements of the slice
-	if len(g.targets)-i > 0 {
-		//	fmt.Printf("Removing %d elements\n", len(g.targets)-i)
-		g.score += len(g.targets) - i
-	}
-
-	for j := i; j < len(g.targets); j++ {
-		g.targets[j] = nil
-	}
-	g.targets = g.targets[:i]
-}
-
-func (g *Game) StepGame() {
-
-	g.HandleInput()
-
-	if !g.Paused {
-
-		g.hero.Update()
-		g.explosion.Update()
-
-		g.UpdateTargets()
-		g.UpdateProjectiles()
-
-		if !g.gameover {
-			g.UpdateHeroPosition()
-			//append new projectiles
-			g.AppendProjectiles()
-			//add new target with increasing frequency
-			g.SpawnEnemies()
-			//handle pulsewave updates
-			g.HandlePulseWaveUpdate()
-		}
-
-		g.CleanupTargets()
-		g.counter++
-	}
-}
-
-func (g *Game) SpawnEnemies() {
-	f := 40000 / (g.counter + 1)
-	if g.counter%f == 0 {
-		g.targets = append(g.targets, NewMover())
-
-		x0 := rand.Float64() * 640
-		y0 := rand.Float64() * 480
-		quadrant := rand.IntN(3)
-
-		switch quadrant {
-		case 0:
-			g.targets[len(g.targets)-1].SetOrigin(Coordinates{X: x0, Y: -MOVER_HEIGHT})
-		case 1:
-			g.targets[len(g.targets)-1].SetOrigin(Coordinates{X: x0, Y: screenHeight + MOVER_HEIGHT})
-		case 2:
-			g.targets[len(g.targets)-1].SetOrigin(Coordinates{X: -MOVER_WIDTH, Y: y0})
-		case 3:
-			g.targets[len(g.targets)-1].SetOrigin(Coordinates{X: screenWidth + x0, Y: y0})
-		default:
-			g.targets[len(g.targets)-1].SetOrigin(Coordinates{X: x0, Y: y0})
-			fmt.Println("WTF " + string(quadrant))
-		}
-
-	}
-}
-
-func (g *Game) HandlePulseWaveUpdate() {
-	if g.explosion.Active {
-		if g.explosion.Radius > math.Sqrt(640*640+480*480) {
-			g.explosion.ToggleActivate()
-			g.explosion.Reset()
-			g.ResetTargetTouches()
-		}
-
-		//check collisions
-		for _, target := range g.targets {
-			dx := target.Pos.X - g.hero.Pos.X
-			dy := target.Pos.Y - g.hero.Pos.Y
-			r := math.Sqrt(dx*dx + dy*dy)
-
-			if r >= g.explosion.Radius-5 && r <= g.explosion.Radius+5 && target.Action <= MoverActionDamaged && !target.Touched {
-				target.ToggleColor()
-				target.Touched = true
-				//target.SetHit()
-			}
-		}
-	}
-}
-
-func (g *Game) UpdateProjectiles() {
-	for k, p := range g.projectiles {
-
-		//for i := 0; i < len(g.projectiles); i++ {
-		//	g.projectiles[i].Update()
-		p.Update()
-
-		//if g.projectiles[i].Pos.X < 5 || g.projectiles[i].Pos.X > 635 || g.projectiles[i].Pos.Y < 5 || g.projectiles[i].Pos.Y > 475 {
-		if p.Pos.X < 5 || p.Pos.X > 635 || p.Pos.Y < 5 || p.Pos.Y > 475 {
-			p.Velocity = 0
-			delete(g.projectiles, k)
-		}
-
-		//compute projectile collisions
-		for _, target := range g.targets {
-			//first, boundary check
-			if p.Pos.X >= target.Pos.X-MOVER_WIDTH/2 && p.Pos.X <= target.Pos.X+MOVER_WIDTH/2 && p.Pos.Y >= target.Pos.Y-MOVER_HEIGHT/2 && p.Pos.Y <= target.Pos.Y+MOVER_HEIGHT/2 && target.Action == MoverActionDamaged {
-				//fmt.Println("potential collision")
-
-				//the following computes total collisions in the image using a projectile mask that is a duplicate of what is on screen
-				//there's definitely room for optimization here
-				g.collisionMask.Clear()
-				g.collisionMask.DrawImage(g.projectileMask, nil)
-
-				op := &ebiten.DrawImageOptions{}
-				op.GeoM.Reset()
-				op.Blend = ebiten.BlendSourceIn
-				op.GeoM.Translate(target.Pos.X-MOVER_WIDTH/2, target.Pos.Y-MOVER_HEIGHT/2)
-				g.collisionMask.DrawImage(target.Sprite, op)
-
-				//var pixels []byte = make([]byte, MOVER_WIDTH*MOVER_HEIGHT*4)
-				var pixels []byte = make([]byte, screenWidth*screenHeight*4)
-				g.collisionMask.ReadPixels(pixels)
-				for i := 0; i < len(pixels); i = i + 4 {
-					if pixels[i+3] != 0 {
-						//fmt.Println("pixel collision")
-						delete(g.projectiles, k)
-						//target.ToggleColor()
-						target.SetHit()
-						//target.SetOrigin(Coordinates{X: rand.Float64() * 640, Y: rand.Float64() * 480})
-						target.Hit = true
-						break
-					}
-				}
-			}
-		}
-	}
-}
-
-func (g *Game) UpdateTargets() {
-	for _, target := range g.targets {
-
-		if !target.Hit && g.hero.Action < MoverActionDying {
-			dx := g.hero.Pos.X - target.Pos.X
-			dy := g.hero.Pos.Y - target.Pos.Y
-			angle := math.Atan2(dy, dx)
-
-			//maxspeed := (float64(g.counter) + 1.) / 1000.
-			maxspeed := 2.9
-			target.Pos.X += maxspeed * math.Cos(angle)
-			target.Pos.Y += maxspeed * math.Sin(angle)
-		}
-
-		//compute collision with hero
-		if g.hero.Pos.X >= target.Pos.X-MOVER_WIDTH/2 && g.hero.Pos.X <= target.Pos.X+MOVER_WIDTH/2 && g.hero.Pos.Y >= target.Pos.Y-MOVER_HEIGHT/2 && g.hero.Pos.Y <= target.Pos.Y+MOVER_HEIGHT/2 && target.Action < MoverActionDying && g.hero.Action < MoverActionDying {
-			g.heroCollisionMask.Clear()
-			g.heroCollisionMask.DrawImage(g.hero.Sprite, nil)
-
-			op := &ebiten.DrawImageOptions{}
-			op.GeoM.Reset()
-			op.Blend = ebiten.BlendSourceIn
-			op.GeoM.Translate((g.hero.Pos.X-target.Pos.X)-MOVER_WIDTH/2, (g.hero.Pos.Y-target.Pos.Y)-MOVER_HEIGHT/2)
-			g.heroCollisionMask.DrawImage(target.Sprite, op)
-
-			//var pixels []byte = make([]byte, MOVER_WIDTH*MOVER_HEIGHT*4)
-			var pixels []byte = make([]byte, MOVER_HEIGHT*MOVER_HEIGHT*4)
-			g.heroCollisionMask.ReadPixels(pixels)
-			for i := 0; i < len(pixels); i = i + 4 {
-				if pixels[i+3] != 0 {
-					//fmt.Println("pixel death")
-					g.hero.SetHit()
-					g.gameover = true
-					break
-				}
-			}
-		}
-
-		target.Update()
-	}
-}
-
-func (g *Game) ResetTargetTouches() {
-	for _, t := range g.targets {
-		t.Touched = false
-	}
-}
-
-func (g *Game) AppendProjectiles() {
-	if g.counter%14 == 0 && ebiten.IsGamepadButtonPressed(0, ebiten.GamepadButton7) {
-
-		g.projectiles[g.counter] = NewProjectile(Coordinates{X: g.hero.Pos.X, Y: g.hero.Pos.Y}, g.hero.Angle, 5.)
-		g.projectiles[g.counter+1] = NewProjectile(Coordinates{X: g.hero.Pos.X, Y: g.hero.Pos.Y}, g.hero.Angle+math.Pi, 5.)
-	}
-}
-
-func (g *Game) HandleInput() {
-	if len(g.gamepadIDs) > 0 {
-		if ebiten.IsGamepadButtonPressed(0, ebiten.GamepadButton11) {
-			if !g.explosion.Active && !g.gameover {
-				g.explosion.SetOrigin(g.hero.Pos)
-				g.explosion.Reset()
-				g.explosion.ToggleActivate()
-			}
-		}
-
-		if inpututil.IsGamepadButtonJustPressed(0, ebiten.GamepadButton9) {
-			if g.gameover {
-				g.reset = true
-			} else {
-				g.Paused = !g.Paused
-			}
-		}
-
-		//account for controller sensitivity
-		if !g.gameover {
-			xaxis := ebiten.StandardGamepadAxisValue(0, ebiten.StandardGamepadAxisRightStickHorizontal)
-			yaxis := ebiten.StandardGamepadAxisValue(0, ebiten.StandardGamepadAxisRightStickVertical)
-
-			if yaxis <= 0.09 && yaxis >= -0.09 {
-				yaxis = 0
-			}
-			if xaxis <= 0.09 && xaxis >= -0.09 {
-				xaxis = 0
-			}
-
-			inputangle := math.Atan2(yaxis, xaxis)
-			g.hero.SetAngle(inputangle)
-		}
-	}
-}
-
-func (g *Game) UpdateHeroPosition() {
-	//handle gamepad input
-	inpx := ebiten.GamepadAxisValue(0, 0)
-	inpy := ebiten.GamepadAxisValue(0, 1)
-	if inpx >= 0.15 || inpx <= -0.15 {
-		g.hero.Pos.X += ebiten.GamepadAxisValue(0, 0) * 5
-	}
-
-	if inpy >= 0.15 || inpy <= -0.15 {
-		g.hero.Pos.Y += ebiten.GamepadAxisValue(0, 1) * 5
-	}
-}
-
-func (g *Game) ConstructBackground() {
-	g.background = ebiten.NewImage(screenWidth, screenHeight)
-	BLOCK_SIZE := 32
-
-	for i := 0; i < 640/16; i++ {
-		for j := 0; j < 480/16; j++ {
-
-			//select random tile in x and y from tileset
-			idx_y := rand.IntN(256 / BLOCK_SIZE)
-			idx_x := rand.IntN(256 / BLOCK_SIZE)
-
-			x0 := BLOCK_SIZE * idx_x
-			y0 := BLOCK_SIZE * idx_y
-			x1 := x0 + BLOCK_SIZE
-			y1 := y0 + BLOCK_SIZE
-
-			//translate for grid element we're painting
-			op := &ebiten.DrawImageOptions{}
-			op.GeoM.Translate(float64(i)*16, float64(j)*16)
-			g.background.DrawImage(tilesetImage.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
-		}
-	}
-
-	ax := float64(rand.IntN(640/BLOCK_SIZE) * BLOCK_SIZE)
-	ay := float64(rand.IntN(480/BLOCK_SIZE) * BLOCK_SIZE)
-
-	op := &ebiten.DrawImageOptions{}
-	op.GeoM.Translate(ax, ay)
-	g.background.DrawImage(altarImage, op)
-}

gamedata/coordinates.go

@@ -1,4 +1,4 @@
-package main
+package gamedata
 
 type Coordinates struct {
 	X float64

gamedata/enemystates.go

@@ -0,0 +1,12 @@
+package gamedata
+
+type EnemyState int
+
+const (
+	EnemyStateDefault = iota
+	EnemyStateHit
+	EnemyStateDying
+	EnemyStateExploding
+	EnemyStateDead
+	EnemyStateMax
+)

gamedata/gameevents.go

@@ -0,0 +1,12 @@
+package gamedata
+
+type GameEvent int
+
+const (
+	GameEventPlayerDeath = iota
+	GameEventCharge
+	GameEventNewShot
+	GameEventTargetHit
+	GameEventExplosion
+	GameEventFireball
+)

gamedata/gameinfo.go

@@ -0,0 +1,16 @@
+package gamedata
+
+type Area struct {
+	Width  int
+	Height int
+}
+
+func (a *Area) Area() int {
+	return a.Height * a.Width
+}
+
+type GameInfo struct {
+	Name       string
+	Version    string
+	Dimensions Area
+}

gamedata/gameinputs.go

@@ -0,0 +1,13 @@
+package gamedata
+
+type GameInputs struct {
+	XAxis       float64
+	YAxis       float64
+	ShotAngle   float64
+	Shot        bool
+	Start       bool
+	Charge      bool
+	Quit        bool
+	Reset       bool
+	CycleWeapon bool
+}

gamedata/weapontype.go

@@ -0,0 +1,9 @@
+package gamedata
+
+type WeaponType int
+
+const (
+	WeaponTypeGun = iota
+	WeaponTypeLaser
+	WeaponTypeMax
+)

gameelement/background.go

@@ -0,0 +1,83 @@
+package gameelement
+
+import (
+	"image"
+	"math/rand/v2"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type Background struct {
+	Sprite      *ebiten.Image
+	initialized bool
+}
+
+func NewBackground(a gamedata.Area) *Background {
+	b := &Background{
+		Sprite:      ebiten.NewImage(a.Width, a.Height),
+		initialized: false,
+	}
+	return b
+}
+
+func (b *Background) SetInputs(gamedata.GameInputs) {
+
+}
+
+func (b *Background) Update() error {
+
+	if !b.initialized {
+		b.Initialize()
+	} else {
+
+	}
+
+	return nil
+}
+
+func (b *Background) Draw(drawimg *ebiten.Image) {
+	//all the stuff before
+	op := &ebiten.DrawImageOptions{}
+	drawimg.DrawImage(b.Sprite, op)
+}
+
+func (b *Background) Initialize() {
+	b.ConstructBackground()
+	b.initialized = true
+}
+
+func (b *Background) ConstructBackground() {
+	BLOCK_SIZE := 32
+
+	for i := 0; i < b.Sprite.Bounds().Dx()/BLOCK_SIZE; i++ {
+		for j := 0; j < b.Sprite.Bounds().Dy()/BLOCK_SIZE; j++ {
+
+			//select random tile in x and y from tileset
+			idx_y := rand.IntN(256 / BLOCK_SIZE)
+			idx_x := rand.IntN(256 / BLOCK_SIZE)
+
+			x0 := BLOCK_SIZE * idx_x
+			y0 := BLOCK_SIZE * idx_y
+			x1 := x0 + BLOCK_SIZE
+			y1 := y0 + BLOCK_SIZE
+
+			//translate for grid element we're painting
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Translate(float64(i*BLOCK_SIZE), float64(j*BLOCK_SIZE))
+			b.Sprite.DrawImage(assets.ImageBank[assets.TileSet].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		}
+	}
+
+	ax := float64(rand.IntN(b.Sprite.Bounds().Dx()/BLOCK_SIZE) * BLOCK_SIZE)
+	ay := float64(rand.IntN(b.Sprite.Bounds().Dy()/BLOCK_SIZE) * BLOCK_SIZE)
+
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Translate(ax, ay)
+	b.Sprite.DrawImage(assets.ImageBank[assets.Altar], op)
+}
+
+func (b *Background) RegisterEvents(e gamedata.GameEvent, f func()) {
+
+}

gameelement/canvas.go

@@ -0,0 +1,988 @@
+package gameelement
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"math"
+	"math/rand/v2"
+	"mover/assets"
+	"mover/elements"
+	"mover/fonts"
+	"mover/gamedata"
+	"mover/weapons"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/text"
+	"github.com/hajimehoshi/ebiten/v2/vector"
+)
+
+type Canvas struct {
+	Sprite            *ebiten.Image
+	collisionMask     *ebiten.Image
+	projectileMask    *ebiten.Image
+	laserMask         *ebiten.Image
+	heroCollisionMask *ebiten.Image
+	heroCollisionCpy  *ebiten.Image
+
+	eventmap map[gamedata.GameEvent]func()
+
+	initialized   bool
+	goblinspawned bool
+	goblindead    bool
+	lastInputs    gamedata.GameInputs
+	runtime       float64
+	counter       int
+	score         int
+	splashes      []*elements.Splash
+	wpdrops       []*elements.WeaponDrop
+	hero          *elements.Hero
+	charge        *elements.Explosion
+	goblin        *elements.FlyGoblin
+	enemies       []elements.Enemies
+	projectiles   []*elements.Projectile
+	laser         *elements.Laser
+	gameover      bool
+
+	lasercoords []gamedata.Coordinates
+	holster     *weapons.Holster
+}
+
+func NewCanvas(a gamedata.Area) *Canvas {
+	c := &Canvas{
+		Sprite:            ebiten.NewImage(a.Width, a.Height),
+		projectileMask:    ebiten.NewImage(a.Width, a.Height),
+		collisionMask:     ebiten.NewImage(a.Width, a.Height),
+		laserMask:         ebiten.NewImage(a.Width, a.Height),
+		heroCollisionMask: ebiten.NewImage(48, 48),
+		heroCollisionCpy:  ebiten.NewImage(48, 48),
+		hero:              elements.NewHero(),
+		charge:            elements.NewExplosion(),
+		laser:             elements.NewLaser(gamedata.Coordinates{X: 320, Y: 240}, 0),
+		initialized:       false,
+		gameover:          false,
+		goblinspawned:     false,
+		goblindead:        false,
+		score:             0,
+		runtime:           0.,
+		counter:           0,
+		holster:           weapons.NewHolster(),
+	}
+	c.laserMask.Clear()
+	c.eventmap = make(map[gamedata.GameEvent]func())
+	c.lasercoords = make([]gamedata.Coordinates, 4)
+	return c
+}
+
+func (c *Canvas) SetInputs(gi gamedata.GameInputs) {
+	c.lastInputs = gi
+}
+
+func (c *Canvas) Update() error {
+	if !c.initialized {
+		c.Initialize()
+	} else {
+		c.UpdateHero()
+		c.UpdateWeaponDrops()
+		c.UpdateWeapons()
+		c.UpdateProjectiles()
+		c.UpdateCharge()
+		c.UpdateEnemies()
+		c.SpawnEnemies()
+		c.CleanupTargets()
+		c.UpdateSplashes()
+		c.CleanSplashes()
+		c.CleanupDrops()
+		c.counter++
+	}
+
+	return nil
+}
+
+func (c *Canvas) Draw(drawimg *ebiten.Image) {
+	c.Sprite.Clear()
+	c.projectileMask.Clear()
+	//c.laserMask.Clear()
+
+	//vector.DrawFilledCircle(c.Sprite, float32(c.hero.Pos.X), float32(c.hero.Pos.Y), 100, color.White, true)
+
+	//render heor
+	c.hero.Draw()
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Translate(c.hero.Pos.X-48/2, c.hero.Pos.Y-48/2)
+	c.Sprite.DrawImage(c.hero.Sprite, op)
+
+	//render weapon
+	if !c.gameover {
+		op.GeoM.Reset()
+		op.GeoM.Translate(0, -16)
+		op.GeoM.Rotate(c.lastInputs.ShotAngle)
+		op.GeoM.Translate(c.hero.Pos.X, c.hero.Pos.Y)
+		c.Sprite.DrawImage(assets.ImageBank[assets.Weapon], op)
+	}
+
+	//draw enemy shadows
+	for _, es := range c.enemies {
+		if es.GetEnemyState() < gamedata.EnemyStateExploding {
+
+			dx := float64(assets.ImageBank[assets.FlyEyeShadow].Bounds().Dx()) / 2
+			dy := float64(assets.ImageBank[assets.FlyEyeShadow].Bounds().Dy()) / 2
+			sx := float64(es.GetSprite().Bounds().Dx()) / 48
+			sy := float64(es.GetSprite().Bounds().Dy()) / 48
+
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Translate(-dx, -dy)
+			op.GeoM.Scale(sx, sy)
+			op.GeoM.Translate(es.GetPosition().X, es.GetPosition().Y+float64(es.GetSprite().Bounds().Dx())/2)
+			c.Sprite.DrawImage(assets.ImageBank[assets.FlyEyeShadow], op)
+		}
+	}
+
+	//draw weapon drops
+	for _, drop := range c.wpdrops {
+		drop.Draw()
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(drop.GetPosition().X-float64(drop.Sprite.Bounds().Dx())/2, drop.GetPosition().Y-float64(drop.Sprite.Bounds().Dy())/2)
+		c.Sprite.DrawImage(drop.Sprite, op)
+	}
+
+	//draw enemies
+	for _, e := range c.enemies {
+		e.Draw()
+
+		xshift := float64(e.GetSprite().Bounds().Dx() / 2)
+		yshift := float64(e.GetSprite().Bounds().Dy() / 2)
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(-xshift, -yshift)
+		op.GeoM.Rotate(e.GetAngle())
+		op.GeoM.Translate(e.GetPosition().X, e.GetPosition().Y)
+
+		c.Sprite.DrawImage(e.GetSprite(), op)
+
+		//do we need a health bar for this enemy?
+		if e.Health() > 0 {
+
+			hbWidth := float64(e.MaxHealth())*2 + 4
+			p1 := float64(e.GetSprite().Bounds().Dx())
+			p0 := e.GetPosition().X - p1/2
+			x0 := p0 - (hbWidth-p1)/2
+			y0 := e.GetPosition().Y - 2/3.*float64(e.GetSprite().Bounds().Dy())
+			vector.DrawFilledRect(c.Sprite, float32(x0), float32(y0), float32(e.MaxHealth())*2+4, 12, color.Black, true)
+			vector.DrawFilledRect(c.Sprite, float32(x0+2), float32(y0+2), float32(e.Health())*2, 8, color.RGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, true)
+		}
+	}
+
+	//draw projectiles
+	for _, p := range c.projectiles {
+		vector.DrawFilledCircle(c.projectileMask, float32(p.Pos.X), float32(p.Pos.Y), 3, color.White, true)
+	}
+	c.Sprite.DrawImage(c.projectileMask, nil)
+
+	//draw laser(s)
+	if c.laser.IsFiring() {
+		c.laser.Draw()
+		c.Sprite.DrawImage(c.laserMask, nil)
+	}
+	//c.Sprite.DrawImage(c.laser.Sprite, op)
+
+	vector.StrokeCircle(c.Sprite, float32(c.charge.Origin.X), float32(c.charge.Origin.Y), float32(c.charge.Radius), 3, color.White, true)
+
+	//TEMPORARY let's see how far off the beam we are
+	//vector.StrokeLine(c.Sprite, float32(c.lasercoords[2].X), float32(c.lasercoords[2].Y), float32(c.lasercoords[3].X), float32(c.lasercoords[3].Y), 2, color.White, true)
+
+	//let's render our laser 'splashes'
+	for _, sp := range c.splashes {
+		sp.Draw()
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(sp.GetPosition().X-128/2, sp.GetPosition().Y-128/2)
+		c.Sprite.DrawImage(sp.Sprite, op)
+	}
+
+	if !c.gameover {
+		c.runtime = float64(c.counter) / 60.
+	}
+	s := fmt.Sprintf("%02.3f", c.runtime)
+	if !c.gameover {
+		text.Draw(c.Sprite, "TIME: "+s, fonts.SurviveFont.Arcade, 640/2-250, 25, color.White)
+		text.Draw(c.Sprite, fmt.Sprintf("SCORE: %d", c.score*10), fonts.SurviveFont.Arcade, 640/2+100, 25, color.White)
+	} else {
+		if (c.counter/30)%2 == 0 {
+			text.Draw(c.Sprite, "TIME: "+s, fonts.SurviveFont.Arcade, 640/2-250, 25, color.White)
+			text.Draw(c.Sprite, fmt.Sprintf("SCORE: %d", c.score*10), fonts.SurviveFont.Arcade, 640/2+100, 25, color.White)
+		}
+
+		text.Draw(c.Sprite, "PRESS START TO TRY AGAIN", fonts.SurviveFont.Arcade, 640/2-150, 480/2, color.White)
+	}
+
+	op.GeoM.Reset()
+	drawimg.DrawImage(c.Sprite, op)
+}
+
+func (c *Canvas) Initialize() {
+
+	c.InitializeHero()
+	c.CleanSplashes()
+	c.ResetWeaponDrops()
+	c.enemies = c.enemies[:0]
+	c.gameover = false
+	c.initialized = true
+	c.score = 0
+	c.counter = 0
+	c.runtime = 0.
+	c.goblinspawned = false
+	c.goblindead = false
+
+	//temporary
+	c.hero.Action = elements.HeroActionDefault
+
+	c.holster.SetActiveWeapon(gamedata.WeaponTypeGun)
+	c.laser.SetFiring(false)
+}
+
+func (c *Canvas) UpdateHero() {
+	c.hero.Update()
+	if !c.gameover {
+		c.UpdateHeroPosition()
+		c.ComputeHeroCollisions()
+	}
+}
+
+func (c *Canvas) UpdateHeroPosition() {
+	if c.lastInputs.XAxis >= 0.15 || c.lastInputs.XAxis <= -0.15 {
+		c.hero.Left = c.lastInputs.XAxis < 0
+		c.hero.Pos.X += c.lastInputs.XAxis * 5
+	}
+
+	if c.lastInputs.YAxis >= 0.15 || c.lastInputs.YAxis <= -0.15 {
+		c.hero.Pos.Y += c.lastInputs.YAxis * 5
+	}
+}
+
+func (c *Canvas) ComputeHeroCollisions() {
+	for _, e := range c.enemies {
+		//compute collision with hero
+		if c.hero.Pos.X >= e.GetPosition().X-float64(e.GetSprite().Bounds().Dx())/2 && c.hero.Pos.X <= e.GetPosition().X+float64(e.GetSprite().Bounds().Dx())/2 &&
+			c.hero.Pos.Y >= e.GetPosition().Y-float64(e.GetSprite().Bounds().Dy())/2 && c.hero.Pos.Y <= e.GetPosition().Y+float64(e.GetSprite().Bounds().Dy())/2 &&
+			e.GetEnemyState() < gamedata.EnemyStateDying {
+
+			// 			target.Action < elements.MoverActionDying && g.hero.Action < elements.HeroActionDying {
+
+			c.heroCollisionMask.Clear()
+			c.heroCollisionMask.DrawImage(c.hero.Sprite, nil)
+
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Reset()
+			op.Blend = ebiten.BlendSourceIn
+			op.GeoM.Translate((c.hero.Pos.X-e.GetPosition().X)-float64(e.GetSprite().Bounds().Dx())/2, (c.hero.Pos.Y-e.GetPosition().Y)-float64(e.GetSprite().Bounds().Dy())/2)
+			c.heroCollisionMask.DrawImage(e.GetSprite(), op)
+
+			if c.HasCollided(c.heroCollisionMask, 48*48*4) {
+				c.hero.SetHit()
+				c.gameover = true
+
+				if c.eventmap[gamedata.GameEventPlayerDeath] != nil {
+					c.eventmap[gamedata.GameEventPlayerDeath]()
+				}
+			}
+		}
+	}
+}
+
+func (c *Canvas) AddProjectiles() {
+
+	//add new projectiles
+
+	if c.lastInputs.Shot && c.counter%14 == 0 {
+
+		loc := gamedata.Coordinates{
+			X: c.hero.Pos.X,
+			Y: c.hero.Pos.Y,
+		}
+		angle := c.lastInputs.ShotAngle
+		velocity := 5.
+
+		c.projectiles = append(c.projectiles, elements.NewProjectile(loc, angle, velocity))
+
+		if c.hero.Upgrade {
+			c.projectiles = append(c.projectiles, elements.NewProjectile(loc, angle+math.Pi, velocity))
+		}
+
+		if c.eventmap[gamedata.GameEventNewShot] != nil {
+			c.eventmap[gamedata.GameEventNewShot]()
+		}
+
+	}
+
+}
+
+func (c *Canvas) InitializeHero() {
+	//recenter the hero
+	pos := gamedata.Coordinates{
+		X: float64(c.Sprite.Bounds().Dx() / 2),
+		Y: float64(c.Sprite.Bounds().Dy() / 2),
+	}
+	c.hero.SetOrigin(pos)
+}
+
+func (c *Canvas) UpdateProjectiles() {
+	i := 0
+	for _, p := range c.projectiles {
+		p.Update()
+
+		projectilevalid := true
+
+		if p.Pos.X < -640/2 || p.Pos.X > 1.5*640 || p.Pos.Y < -480/2 || p.Pos.Y > 1.5*480 {
+			projectilevalid = false
+		}
+
+		for _, e := range c.enemies {
+			if p.Pos.X >= e.GetPosition().X-float64(e.GetSprite().Bounds().Dx())/2 && p.Pos.X <= e.GetPosition().X+float64(e.GetSprite().Bounds().Dx())/2 &&
+				p.Pos.Y >= e.GetPosition().Y-float64(e.GetSprite().Bounds().Dy())/2 && p.Pos.Y <= e.GetPosition().Y+float64(e.GetSprite().Bounds().Dy())/2 &&
+				e.IsToggled() && e.GetEnemyState() < gamedata.EnemyStateDying {
+				c.collisionMask.Clear()
+				c.collisionMask.DrawImage(c.projectileMask, nil)
+
+				op := &ebiten.DrawImageOptions{}
+				op.GeoM.Reset()
+				op.Blend = ebiten.BlendSourceIn
+				op.GeoM.Translate(e.GetPosition().X-float64(e.GetSprite().Bounds().Dx())/2, e.GetPosition().Y-float64(e.GetSprite().Bounds().Dy())/2)
+				c.collisionMask.DrawImage(e.GetSprite(), op)
+
+				if c.HasCollided(c.collisionMask, 640*480*4) {
+					projectilevalid = false
+					e.SetHit()
+
+					if c.eventmap[gamedata.GameEventTargetHit] != nil {
+						c.eventmap[gamedata.GameEventTargetHit]()
+					}
+				}
+			}
+		}
+
+		if projectilevalid {
+			c.projectiles[i] = p
+			i++
+		}
+	}
+
+	for j := i; j < len(c.projectiles); j++ {
+		c.projectiles[j] = nil
+	}
+	c.projectiles = c.projectiles[:i]
+
+}
+
+func (c *Canvas) UpdateLaser() {
+	c.laser.Update()
+
+	c.laser.SetFiring(c.lastInputs.Shot)
+
+	if c.lastInputs.Shot {
+		c.laser.SetPosition(c.hero.Pos)
+		c.laser.SetAngle(c.lastInputs.ShotAngle)
+
+		c.laserMask.Clear()
+		lpos := c.laser.GetPosition()
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Reset()
+		//op.GeoM.Translate(-float64(c.laser.Sprite.Bounds().Dx())/2, -float64(c.laser.Sprite.Bounds().Dy())/2)
+		op.GeoM.Translate(0, -float64(c.laser.Sprite.Bounds().Dy())/2)
+		op.GeoM.Rotate(c.laser.GetAngle())
+		op.GeoM.Translate(lpos.X, lpos.Y)
+		c.laserMask.DrawImage(c.laser.Sprite, op)
+
+		//c.LaserAttempt1()
+		//c.LaserAttempt2()
+		//c.LaserAttempt3()
+		c.LaserAttempt4()
+	}
+}
+
+func (c *Canvas) UpdateCharge() {
+
+	if c.lastInputs.Charge && !c.charge.Active && !c.gameover {
+		c.charge.SetOrigin(c.hero.Pos)
+		c.charge.Reset()
+		c.charge.ToggleActivate()
+
+		if c.eventmap[gamedata.GameEventCharge] != nil {
+			c.eventmap[gamedata.GameEventCharge]()
+		}
+	}
+
+	c.charge.Update()
+	if c.charge.Active {
+		if c.charge.Radius > math.Sqrt(640*640+480*480) {
+			c.charge.ToggleActivate()
+			c.charge.Reset()
+			c.ResetTargetTouches()
+		}
+
+		for _, e := range c.enemies {
+			dx := e.GetPosition().X - c.hero.Pos.X
+			dy := e.GetPosition().Y - c.hero.Pos.Y
+			r := math.Sqrt(dx*dx + dy*dy)
+
+			if r >= c.charge.Radius-5 && r <= c.charge.Radius+5 &&
+				!e.IsTouched() && e.GetEnemyState() <= gamedata.EnemyStateHit {
+				e.SetToggle()
+				e.SetTouched()
+			}
+		}
+	}
+}
+
+func (c *Canvas) ResetTargetTouches() {
+	for _, e := range c.enemies {
+		e.ClearTouched()
+	}
+}
+
+func (c *Canvas) UpdateEnemies() {
+	//update existing enemies
+	for _, e := range c.enemies {
+		if !c.gameover {
+			e.SetTarget(c.hero.Pos)
+
+			if e.GetEnemyState() == gamedata.EnemyStateExploding && !e.ExplosionInitiated() {
+				if c.eventmap[gamedata.GameEventExplosion] != nil {
+					c.eventmap[gamedata.GameEventExplosion]()
+				}
+				e.SetExplosionInitiated()
+			}
+		} else {
+			e.SetTarget(e.GetPosition())
+		}
+
+		e.Update()
+	}
+
+}
+
+func (c *Canvas) SpawnEnemies() {
+	if !c.gameover {
+
+		if !c.goblinspawned || c.goblindead {
+			c.SpawnFlyEyes()
+		}
+
+		if !c.goblinspawned && c.counter > 2400 && !c.goblindead {
+			c.SpawnGoblin()
+		}
+
+	}
+}
+
+func (c *Canvas) SpawnFlyEyes() {
+	//spawn new enemies
+	f := 40000 / (c.counter + 1)
+
+	if c.counter%f == 0 {
+		newenemy := elements.NewFlyEye()
+
+		x0 := rand.Float64() * 640
+		y0 := rand.Float64() * 480
+		quadrant := rand.IntN(3)
+
+		switch quadrant {
+		case 0:
+			newenemy.SetPosition(gamedata.Coordinates{X: x0, Y: -48})
+		case 1:
+			newenemy.SetPosition(gamedata.Coordinates{X: x0, Y: 480 + 48})
+		case 2:
+			newenemy.SetPosition(gamedata.Coordinates{X: -48, Y: y0})
+		case 3:
+			newenemy.SetPosition(gamedata.Coordinates{X: 640 + x0, Y: y0})
+		}
+
+		newenemy.SetTarget(c.hero.Pos)
+
+		c.enemies = append(c.enemies, newenemy)
+	}
+}
+
+func (c *Canvas) SpawnGoblin() {
+	newfg := elements.NewFlyGoblin()
+	newfg.SetDeathEvent(c.GoblinDeathEvent)
+	newfg.SetFireballCallback(c.GoblinFireballEvent)
+
+	x0 := rand.Float64() * 640
+	y0 := rand.Float64() * 480
+	quadrant := rand.IntN(3)
+
+	switch quadrant {
+	case 0:
+		newfg.SetPosition(gamedata.Coordinates{X: x0, Y: -96})
+	case 1:
+		newfg.SetPosition(gamedata.Coordinates{X: x0, Y: 480 + 48})
+	case 2:
+		newfg.SetPosition(gamedata.Coordinates{X: -96, Y: y0})
+	case 3:
+		newfg.SetPosition(gamedata.Coordinates{X: 640 + x0, Y: y0})
+	}
+
+	c.goblin = newfg
+	c.enemies = append(c.enemies, newfg)
+	c.goblinspawned = true
+}
+
+func (c *Canvas) HasCollided(mask *ebiten.Image, size int) bool {
+	var result bool = false
+	var pixels []byte = make([]byte, size)
+	mask.ReadPixels(pixels)
+	for i := 0; i < len(pixels); i = i + 4 {
+		if pixels[i+3] != 0 {
+			result = true
+			break
+		}
+	}
+	return result
+}
+
+func (c *Canvas) RegisterEvents(e gamedata.GameEvent, f func()) {
+	c.eventmap[e] = f
+}
+
+func (c *Canvas) CleanupTargets() {
+	// remove dead targets by iterating over all targets
+	i := 0
+	for _, e := range c.enemies {
+
+		//compute odds for dropping an item on dead enemies
+		if e.GetEnemyState() == elements.MoverActionDead {
+			if rand.Float64() > 0.98 {
+				drop := elements.NewWeaponDrop(gamedata.WeaponTypeLaser)
+				drop.SetPosition(e.GetPosition())
+				c.wpdrops = append(c.wpdrops, drop)
+			}
+		}
+
+		//moving valid targets to the front of the slice
+		if e.GetEnemyState() < elements.MoverActionDead &&
+			!(e.GetPosition().X < -640*2 || e.GetPosition().X > 640*2 ||
+				e.GetPosition().Y > 480*2 || e.GetPosition().Y < -480*2) {
+			c.enemies[i] = e
+			i++
+		}
+	}
+
+	//then culling the last elements of the slice, and conveniently we can update
+	//our base score with the number of elements removed (bonuses calculated elsewhere)
+	if len(c.enemies)-i > 0 {
+		c.score += len(c.enemies) - i
+	}
+
+	for j := i; j < len(c.enemies); j++ {
+		c.enemies[j] = nil
+	}
+	c.enemies = c.enemies[:i]
+}
+
+func (c *Canvas) GoblinDeathEvent() {
+	c.goblindead = true
+	c.goblinspawned = false
+	c.score += 10
+}
+
+func (c *Canvas) GoblinFireballEvent() {
+
+	if !c.gameover {
+		velocity := 8.
+		dx := c.hero.Pos.X - c.goblin.GetPosition().X
+		dy := c.hero.Pos.Y - c.goblin.GetPosition().Y
+		angle := math.Atan2(dy, dx)
+
+		//add some randomness to the angle
+		arand := rand.Float64() * math.Pi / 3
+
+		newfb := elements.NewFireBall(angle+arand, velocity)
+		newfb.SetPosition(c.goblin.GetPosition())
+		c.enemies = append(c.enemies, newfb)
+
+		if c.eventmap[gamedata.GameEventFireball] != nil {
+			c.eventmap[gamedata.GameEventFireball]()
+		}
+
+	}
+}
+
+func IsPixelColliding(img1, img2 *ebiten.Image, offset1, offset2 image.Point) bool {
+	// Get the pixel data from both images
+	bounds1 := img1.Bounds()
+	bounds2 := img2.Bounds()
+
+	// Create slices to hold the pixel data
+	pixels1 := make([]byte, 4*bounds1.Dx()*bounds1.Dy()) // RGBA (4 bytes per pixel)
+	pixels2 := make([]byte, 4*bounds2.Dx()*bounds2.Dy())
+
+	// Read pixel data from the images
+	img1.ReadPixels(pixels1)
+	img2.ReadPixels(pixels2)
+
+	// Determine the overlapping rectangle
+	rect1 := bounds1.Add(offset1)
+	rect2 := bounds2.Add(offset2)
+	intersection := rect1.Intersect(rect2)
+
+	if intersection.Empty() {
+		return false // No overlap
+	}
+
+	// Check pixel data in the overlapping region
+	for y := intersection.Min.Y; y < intersection.Max.Y; y++ {
+		for x := intersection.Min.X; x < intersection.Max.X; x++ {
+			// Calculate the indices in the pixel slices
+			idx1 := ((y-offset1.Y)*bounds1.Dx() + (x - offset1.X)) * 4
+			idx2 := ((y-offset2.Y)*bounds2.Dx() + (x - offset2.X)) * 4
+
+			// Extract alpha values (transparency)
+			alpha1 := pixels1[idx1+3]
+			alpha2 := pixels2[idx2+3]
+
+			// If both pixels are non-transparent, there's a collision
+			if alpha1 > 0 && alpha2 > 0 {
+				return true
+			}
+		}
+	}
+
+	return false // No collision detected
+}
+
+// RotatePoint rotates a point (x, y) around an origin (ox, oy) by a given angle (in radians).
+func RotatePoint(x, y, ox, oy, angle float64) (float64, float64) {
+	sin, cos := math.Sin(angle), math.Cos(angle)
+	dx, dy := x-ox, y-oy
+	return ox + dx*cos - dy*sin, oy + dx*sin + dy*cos
+}
+
+// IsPixelCollidingWithRotation checks for pixel-perfect collision between two rotated images.
+func IsPixelCollidingWithRotation(img1, img2 *ebiten.Image, center1, center2 image.Point, angle1, angle2 float64) bool {
+	// Get pixel data
+	bounds1 := img1.Bounds()
+	bounds2 := img2.Bounds()
+
+	pixels1 := make([]byte, 4*bounds1.Dx()*bounds1.Dy())
+	pixels2 := make([]byte, 4*bounds2.Dx()*bounds2.Dy())
+
+	img1.ReadPixels(pixels1)
+	img2.ReadPixels(pixels2)
+
+	// Loop through all pixels in the bounding boxes of the first image
+	for y1 := bounds1.Min.Y; y1 < bounds1.Max.Y; y1++ {
+		for x1 := bounds1.Min.X; x1 < bounds1.Max.X; x1++ {
+			// Get alpha for the pixel in img1
+			idx1 := (y1*bounds1.Dx() + x1) * 4
+			alpha1 := pixels1[idx1+3]
+			if alpha1 == 0 {
+				continue // Skip transparent pixels
+			}
+
+			// Rotate this pixel to its global position
+			globalX, globalY := RotatePoint(float64(x1), float64(y1), float64(bounds1.Dx()/2), float64(bounds1.Dy()/2), angle1)
+			globalX += float64(center1.X)
+			globalY += float64(center1.Y)
+
+			// Transform global position to img2's local space
+			localX, localY := RotatePoint(globalX-float64(center2.X), globalY-float64(center2.Y), 0, 0, -angle2)
+
+			// Check if the transformed position is within img2's bounds
+			lx, ly := int(localX)+bounds2.Dx()/2, int(localY)+bounds2.Dy()/2
+			if lx < 0 || ly < 0 || lx >= bounds2.Dx() || ly >= bounds2.Dy() {
+				continue
+			}
+
+			// Get alpha for the pixel in img2
+			idx2 := (ly*bounds2.Dx() + lx) * 4
+			alpha2 := pixels2[idx2+3]
+			if alpha2 > 0 {
+				return true // Collision detected
+			}
+		}
+	}
+
+	return false // No collision
+}
+
+func (c *Canvas) LaserAttempt1() {
+	//for _, e := range c.enemies {
+	/*
+		rgba1 := c.laserMask.SubImage(c.laserMask.Bounds()).(*image.RGBA)
+		rgba2 := e.GetSprite().SubImage(e.GetSprite().Bounds()).(*image.RGBA)
+	*/
+
+	// Check collision
+	/*
+		if IsPixelCollidingWithRotation(c.laser.Sprite,
+			e.GetSprite(),
+			image.Pt(int(c.laser.GetPosition().X), int(c.laser.GetPosition().Y)),
+			image.Pt(int(e.GetPosition().X), int(e.GetPosition().Y)),
+			c.laser.GetAngle(),
+			0,
+		) {
+			println("Pixel-perfect collision detected!")
+		}
+	*/
+	/*
+		c.collisionMask.Clear()
+		c.collisionMask.DrawImage(c.laserMask, nil)
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Reset()
+		op.Blend = ebiten.BlendDestinationIn
+		op.GeoM.Translate(e.GetPosition().X-float64(e.GetSprite().Bounds().Dx())/2, e.GetPosition().Y-float64(e.GetSprite().Bounds().Dy())/2)
+		c.collisionMask.DrawImage(e.GetSprite(), op)
+	*/
+
+	/*
+		if c.HasCollided(c.collisionMask, 640*480*4) {
+
+				if c.eventmap[gamedata.GameEventTargetHit] != nil {
+					c.eventmap[gamedata.GameEventTargetHit]()
+				}
+
+			fmt.Println("enemy sliced")
+		}
+	*/
+	//}
+}
+
+// try to find if the enemy is along the laser line first, then apply pixel collision
+func (c *Canvas) LaserAttempt2() {
+	for _, e := range c.enemies {
+
+		a := c.lastInputs.ShotAngle
+
+		x0 := c.hero.Pos.X
+		y0 := c.hero.Pos.Y
+
+		thresh := 25.
+		x := e.GetPosition().X
+		y := math.Tan(a)*(x-x0) + y0
+		var laserd bool = false
+		if !math.IsNaN(math.Tan(a)) {
+			if math.Abs(e.GetPosition().Y-y) <= thresh {
+				laserd = true
+			} else {
+				if math.Abs(e.GetPosition().X-x0) <= thresh {
+					laserd = true
+				}
+			}
+		}
+		if laserd {
+			//check for pixel collision
+
+			if IsPixelColliding(c.laserMask, e.GetSprite(),
+				image.Pt(0, 0),
+				image.Pt(int(e.GetPosition().X), int(e.GetPosition().Y))) {
+				e.SetHit()
+
+				if c.eventmap[gamedata.GameEventTargetHit] != nil {
+					c.eventmap[gamedata.GameEventTargetHit]()
+				}
+				fmt.Println("laser'd")
+			}
+		}
+	}
+}
+
+// straight up just pixel collision check, expensive though
+func (c *Canvas) LaserAttempt3() {
+	for _, e := range c.enemies {
+
+		if IsPixelColliding(c.laserMask, e.GetSprite(),
+			image.Pt(0, 0),
+			image.Pt(int(e.GetPosition().X), int(e.GetPosition().Y))) {
+			e.SetHit()
+
+			if c.eventmap[gamedata.GameEventTargetHit] != nil {
+				c.eventmap[gamedata.GameEventTargetHit]()
+			}
+			fmt.Println("laser'd")
+		}
+	}
+}
+
+// straight up just pixel collision check, expensive though
+func (c *Canvas) LaserAttempt4() {
+	for _, e := range c.enemies {
+
+		c.lasercoords[2] = e.GetPosition()
+
+		x0 := c.hero.Pos.X
+		y0 := c.hero.Pos.Y
+
+		x1 := e.GetPosition().X
+		y1 := e.GetPosition().Y
+
+		a := c.lastInputs.ShotAngle
+
+		var d float64 = 100
+
+		/*
+			if !math.IsNaN(math.Tan(a)) {
+
+				m0 := math.Tan(a)
+				if m0 == 0 {
+					d = math.Abs(y1 - y0)
+					fmt.Printf("horizontal beam\n")
+					c.lasercoords[3] = gamedata.Coordinates{X: x1, Y: y0}
+				} else {
+					m1 := -1 / m0
+
+					if (m0 - m1) != 0 {
+						xi := (y1 + x0*m0 - y0 - m1*x1) / (m0 - m1)
+						yi := xi*m0 - x0*m0 + y0
+
+						c.lasercoords[3] = gamedata.Coordinates{X: xi, Y: yi}
+
+						d = math.Sqrt(math.Pow(x1-xi, 2) + math.Pow(y1-yi, 2))
+						fmt.Printf("%f \n", d)
+					} else {
+					}
+				}
+				fmt.Printf("%f \n", a)
+			} else {
+				c.lasercoords[3] = gamedata.Coordinates{X: x1, Y: y1}
+				d = math.Abs(x1 - x0)
+				fmt.Printf("vertical beam\n")
+			}
+		*/
+
+		if math.Abs(math.Mod(a, math.Pi)) == math.Pi/2 { // Check for vertical beam
+			d = math.Abs(x1 - x0)
+			c.lasercoords[3] = gamedata.Coordinates{X: x0, Y: y1} // Align on x-axis
+			//fmt.Printf("vertical beam\n")
+		} else if math.Tan(a) == 0 { // Check for horizontal beam
+			d = math.Abs(y1 - y0)
+			c.lasercoords[3] = gamedata.Coordinates{X: x1, Y: y0} // Align on y-axis
+			//fmt.Printf("horizontal beam\n")
+		} else { // General case
+			m0 := math.Tan(a)
+			m1 := -1 / m0
+			xi := (y1 + x0*m0 - y0 - m1*x1) / (m0 - m1)
+			yi := xi*m0 - x0*m0 + y0
+			c.lasercoords[3] = gamedata.Coordinates{X: xi, Y: yi}
+			d = math.Sqrt(math.Pow(x1-xi, 2) + math.Pow(y1-yi, 2))
+			//fmt.Printf("%f \n", d)
+		}
+		//fmt.Printf("%f \n", a)
+
+		if d <= float64(e.GetSprite().Bounds().Dx()) && e.GetEnemyState() <= gamedata.EnemyStateHit {
+
+			if IsPixelColliding(c.laserMask, e.GetSprite(),
+				image.Pt(0, 0),
+				image.Pt(int(e.GetPosition().X), int(e.GetPosition().Y))) {
+				e.SetHit()
+
+				newsplash := elements.NewSplash()
+				//newsplash.SetPosition(c.lasercoords[3])
+				newsplash.SetPosition(e.GetPosition())
+				c.splashes = append(c.splashes, newsplash)
+
+				if c.eventmap[gamedata.GameEventTargetHit] != nil {
+					c.eventmap[gamedata.GameEventTargetHit]()
+				}
+				//fmt.Println("laser'd")
+			}
+		}
+	}
+}
+
+func (c *Canvas) UpdateSplashes() {
+	for _, sp := range c.splashes {
+		sp.Update()
+	}
+}
+
+func (c *Canvas) CleanSplashes() {
+	i := 0
+	for _, sp := range c.splashes {
+		if sp.GetAlpha() > 0 {
+			c.splashes[i] = sp
+			i++
+		}
+	}
+
+	for j := i; j < len(c.splashes); j++ {
+		c.splashes[j] = nil
+	}
+
+	c.splashes = c.splashes[:i]
+}
+
+func (c *Canvas) CleanupDrops() {
+	i := 0
+	for _, drop := range c.wpdrops {
+		if !drop.IsCollected() {
+			c.wpdrops[i] = drop
+			i++
+		}
+	}
+
+	for j := i; j < len(c.wpdrops); j++ {
+		c.wpdrops[j] = nil
+	}
+
+	c.wpdrops = c.wpdrops[:i]
+}
+
+func (c *Canvas) UpdateWeapons() {
+	if !c.gameover {
+		//check for weapon inputs
+		if c.lastInputs.CycleWeapon {
+			c.holster.CycleWeapon()
+		}
+
+		//now let's update some shit based on the weapon
+		switch c.holster.GetActiveWeapon().GetWeaponType() {
+		case gamedata.WeaponTypeGun:
+			c.AddProjectiles()
+		case gamedata.WeaponTypeLaser:
+			c.UpdateLaser()
+		}
+	} else {
+		c.laser.SetFiring(false)
+	}
+
+}
+
+func (c *Canvas) UpdateWeaponDrops() {
+	//do we have any drops? let's calculate the chances
+	//
+
+	for _, drop := range c.wpdrops {
+		drop.Update()
+
+		//has the hero collided with any? add to holster
+		//boundary box collision check
+		if c.hero.Pos.X >= drop.GetPosition().X-float64(drop.Sprite.Bounds().Dx())/2 &&
+			c.hero.Pos.X <= drop.GetPosition().X+float64(drop.Sprite.Bounds().Dx())/2 &&
+			c.hero.Pos.Y >= drop.GetPosition().Y-float64(drop.Sprite.Bounds().Dy())/2 &&
+			c.hero.Pos.Y <= drop.GetPosition().Y+float64(drop.Sprite.Bounds().Dy())/2 {
+			//fmt.Println("hero trying to pick up weapon maybe")
+
+			if IsPixelColliding(
+				c.hero.Sprite,
+				drop.Sprite,
+				image.Pt(int(c.hero.Pos.X), int(c.hero.Pos.Y)),
+				image.Pt(int(drop.GetPosition().X), int(drop.GetPosition().Y)),
+			) {
+				fmt.Println("weapon acquired")
+				drop.SetCollected(true)
+				c.holster.AddWeapon(weapons.NewLaser())
+			}
+
+		}
+	}
+
+}
+
+func (c *Canvas) ResetWeaponDrops() {
+	for i := range c.wpdrops {
+		c.wpdrops[i] = nil
+	}
+	c.wpdrops = c.wpdrops[:0]
+	c.holster = weapons.NewHolster()
+}

gameelement/cloudlayer.go

@@ -0,0 +1,109 @@
+package gameelement
+
+import (
+	"math"
+	"math/rand/v2"
+	"mover/elements"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type CloudLayer struct {
+	Sprite     *ebiten.Image
+	clouds     []*elements.Cloud
+	dimensions gamedata.Area
+	cycle      int
+}
+
+func NewCloudLayer(a gamedata.Area) *CloudLayer {
+	c := &CloudLayer{
+		Sprite:     ebiten.NewImage(a.Width, a.Height),
+		cycle:      0,
+		dimensions: a,
+	}
+	return c
+}
+
+func (c *CloudLayer) SetInputs(gamedata.GameInputs) {
+}
+
+func (c *CloudLayer) Update() error {
+	c.cycle++
+
+	for _, cloud := range c.clouds {
+		cloud.Update()
+
+		cpos := cloud.GetPosition()
+		if cpos.X > float64(c.dimensions.Width)+float64(cloud.Sprite.Bounds().Dx()) {
+			dx := -float64(cloud.Sprite.Bounds().Dx())
+			cloud.SetPosition(gamedata.Coordinates{X: dx, Y: cloud.GetPosition().Y})
+		}
+		if cpos.X < -float64(cloud.Sprite.Bounds().Dx()) {
+			dx := float64(c.dimensions.Width + cloud.Sprite.Bounds().Dx())
+			cloud.SetPosition(gamedata.Coordinates{X: dx, Y: cloud.GetPosition().Y})
+		}
+		if cpos.Y > float64(c.dimensions.Height)+float64(cloud.Sprite.Bounds().Dy()) {
+			dy := -float64(cloud.Sprite.Bounds().Dy())
+			cloud.SetPosition(gamedata.Coordinates{X: cloud.GetPosition().X, Y: dy})
+		}
+		if cpos.Y < -float64(cloud.Sprite.Bounds().Dy()) {
+			dy := float64(c.dimensions.Height + cloud.Sprite.Bounds().Dy())
+			cloud.SetPosition(gamedata.Coordinates{X: cloud.GetPosition().X, Y: dy})
+		}
+	}
+
+	return nil
+}
+
+func (c *CloudLayer) Draw(drawimg *ebiten.Image) {
+	c.Sprite.Clear()
+
+	for _, cloud := range c.clouds {
+		cloud.Draw()
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(cloud.GetPosition().X, cloud.GetPosition().Y)
+		op.ColorScale.ScaleAlpha(float32(cloud.Alpha))
+		c.Sprite.DrawImage(cloud.Sprite, op)
+	}
+
+	drawimg.DrawImage(c.Sprite, nil)
+}
+
+func (c *CloudLayer) Initialize() {
+
+	//cull previous cloud layer
+	for i := 0; i < len(c.clouds); i++ {
+		c.clouds[i] = nil
+	}
+	c.clouds = c.clouds[:0]
+
+	numclouds := rand.IntN(20)
+	angle := rand.Float64() * math.Pi * 2
+
+	for i := 0; i < numclouds; i++ {
+
+		a := gamedata.Area{
+			Height: rand.IntN(c.dimensions.Width/2) + 1,
+			Width:  rand.IntN(c.dimensions.Height/2) + 1,
+		}
+
+		velocity := rand.Float64() * 3
+		//velocity := 0.
+
+		newcloud := elements.NewCloud(a, angle, velocity)
+
+		newcloud.Alpha = rand.Float64() / 2
+
+		newcloud.SetPosition(gamedata.Coordinates{
+			X: rand.Float64() * float64(c.dimensions.Width),
+			Y: rand.Float64() * float64(c.dimensions.Height),
+		})
+
+		c.clouds = append(c.clouds, newcloud)
+	}
+}
+
+func (c *CloudLayer) RegisterEvents(e gamedata.GameEvent, f func()) {
+
+}

gameelement/gameelement.go

@@ -0,0 +1,15 @@
+package gameelement
+
+import (
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type GameElement interface {
+	SetInputs(gamedata.GameInputs)
+	Update() error
+	Draw(drawimg *ebiten.Image)
+	Initialize()
+	RegisterEvents(e gamedata.GameEvent, f func())
+}

gameelement/rainlayer.go

@@ -0,0 +1,149 @@
+package gameelement
+
+import (
+	"math/rand/v2"
+	"mover/elements"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type RainLayer struct {
+	Sprite       *ebiten.Image
+	lastInputs   gamedata.GameInputs
+	raindrops    []*elements.RainDrop
+	nextsplashes []gamedata.Coordinates
+	rainsplashes []*elements.RainSplash
+	dimensions   gamedata.Area
+	cycle        int
+}
+
+func NewRainLayer(a gamedata.Area) *RainLayer {
+	rl := &RainLayer{
+		Sprite:     ebiten.NewImage(a.Width, a.Height),
+		dimensions: a,
+	}
+
+	for i := 0; i < 50; i++ {
+		nrd := elements.NewRainDrop()
+		nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(a.Width), Y: rand.Float64() * float64(a.Height)})
+		rl.raindrops = append(rl.raindrops, nrd)
+	}
+
+	for i := 0; i < 50; i++ {
+		nrd := elements.NewRainSplash()
+		nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(a.Width), Y: rand.Float64() * float64(a.Height)})
+		rl.rainsplashes = append(rl.rainsplashes, nrd)
+	}
+	return rl
+}
+
+func (r *RainLayer) SetInputs(inputs gamedata.GameInputs) {
+	r.lastInputs = inputs
+}
+
+func (r *RainLayer) Update() error {
+
+	r.UpdateDrops()
+	r.UpdateSplashes()
+
+	r.cycle++
+	return nil
+}
+
+func (r *RainLayer) Draw(drawimg *ebiten.Image) {
+	r.Sprite.Clear()
+
+	for _, drop := range r.raindrops {
+		drop.Draw()
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(drop.GetPosition().X, drop.GetPosition().Y)
+		op.ColorScale.ScaleAlpha(0.5)
+		r.Sprite.DrawImage(drop.Sprite, op)
+	}
+
+	for _, drop := range r.rainsplashes {
+		drop.Draw()
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(drop.GetPosition().X, drop.GetPosition().Y)
+		op.ColorScale.ScaleAlpha(0.5)
+		r.Sprite.DrawImage(drop.Sprite, op)
+	}
+
+	drawimg.DrawImage(r.Sprite, nil)
+
+}
+
+func (r *RainLayer) Initialize() {
+
+}
+
+func (r *RainLayer) RegisterEvents(e gamedata.GameEvent, f func()) {
+
+}
+
+func (r *RainLayer) UpdateDrops() {
+	i := 0
+	for _, drop := range r.raindrops {
+		drop.Update()
+
+		if !drop.Expired() {
+			r.raindrops[i] = drop
+			i++
+		} else {
+			r.nextsplashes = append(r.nextsplashes, drop.GetPosition())
+		}
+	}
+
+	var j int = i
+	var newdrops int = 0
+	for ; j < len(r.raindrops); j++ {
+		r.raindrops[j] = nil
+	}
+	newdrops = len(r.raindrops) - i
+	r.raindrops = r.raindrops[:i]
+
+	for k := 0; k < newdrops; k++ {
+		nrd := elements.NewRainDrop()
+		nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(r.dimensions.Width), Y: rand.Float64() * float64(r.dimensions.Height)})
+		r.raindrops = append(r.raindrops, nrd)
+	}
+}
+
+func (r *RainLayer) UpdateSplashes() {
+	i := 0
+	for _, drop := range r.rainsplashes {
+		drop.Update()
+
+		if !drop.Expired() {
+			r.rainsplashes[i] = drop
+			i++
+		}
+	}
+
+	var j int = i
+	//var newdrops int = 0
+	for ; j < len(r.rainsplashes); j++ {
+		r.rainsplashes[j] = nil
+	}
+	//newdrops = len(r.rainsplashes) - i
+	r.rainsplashes = r.rainsplashes[:i]
+
+	/*
+		for k := 0; k < newdrops; k++ {
+			nrd := elements.NewRainSplash()
+			nrd.SetPosition(gamedata.Coordinates{X: rand.Float64() * float64(r.dimensions.Width), Y: rand.Float64() * float64(r.dimensions.Height)})
+			r.rainsplashes = append(r.rainsplashes, nrd)
+		}*/
+
+	for _, splashloc := range r.nextsplashes {
+		nrd := elements.NewRainSplash()
+		nrd.SetPosition(splashloc)
+		r.rainsplashes = append(r.rainsplashes, nrd)
+	}
+
+	r.nextsplashes = r.nextsplashes[:0]
+
+}

go.mod

@@ -13,6 +13,7 @@ require (
 require (
 	github.com/ebitengine/gomobile v0.0.0-20240911145611-4856209ac325 // indirect
 	github.com/ebitengine/hideconsole v1.0.0 // indirect
+	github.com/ebitengine/oto/v3 v3.3.1 // indirect
 	github.com/ebitengine/purego v0.8.0 // indirect
 	github.com/jezek/xgb v1.1.1 // indirect
 	golang.org/x/sync v0.8.0 // indirect

main.go

@@ -1,8 +1,11 @@
 package main
 
 import (
-	"fmt"
 	"log"
+	"mover/assets"
+	"mover/gamedata"
+	"mover/screenmanager"
+	"mover/screens"
 
 	"github.com/hajimehoshi/ebiten/v2"
 )
@@ -13,17 +16,26 @@ const (
 )
 
 func main() {
-	ver := "survive v0.10"
-
-	fmt.Println(ver)
-
-	moverGame := &Game{}
+	//moverGame := &Game{}
+	moverGame := screenmanager.NewManager()
+	moverGame.SetDimensions(gamedata.Area{Width: screenWidth, Height: screenHeight})
 
 	ebiten.SetWindowSize(screenWidth*1.5, screenHeight*1.5)
-	ebiten.SetWindowTitle(ver)
+	ebiten.SetWindowTitle(moverGame.Info.Name + ": v" + moverGame.Info.Version)
 
-	if err := ebiten.RunGame(moverGame); err != nil {
+	loadScreens(&moverGame)
+
+	if err := ebiten.RunGame(&moverGame); err != nil {
 		log.Fatal(err)
 	}
 
 }
+
+func loadScreens(m *screenmanager.Manager) {
+	assets.LoadImages()
+	assets.LoadSounds()
+	m.AddScene(screens.NewStartScreen())
+	//m.AddScene(screens.NewGame())
+	m.AddScene(screens.NewPrimary())
+	m.ResetScenes()
+}

mover.go

@@ -1,192 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"image"
-	"log"
-
-	_ "embed"
-	"image/color"
-	_ "image/png"
-
-	"github.com/hajimehoshi/ebiten/v2"
-)
-
-var (
-	flyeyeImage  *ebiten.Image
-	flyeyeImage2 *ebiten.Image
-	flyeyeImage3 *ebiten.Image
-	shadow       *ebiten.Image
-
-	//go:embed fly-eye.png
-	flyeye_img []byte
-	//go:embed fly-eye2.png
-	flyeye_img2 []byte
-	//go:embed fly-eye3.png
-	flyeye_img3 []byte
-	//go:embed shadow.png
-	shadow_img []byte
-)
-
-const (
-	MoverActionDefault = iota
-	MoverActionDamaged
-	MoverActionDying
-	MoverActionExploding
-	MoverActionDead
-	MoverActionMax
-)
-
-type MoverAction uint
-
-func init() {
-	img, _, err := image.Decode(bytes.NewReader(flyeye_img))
-	if err != nil {
-		log.Fatal(err)
-	}
-	flyeyeImage = ebiten.NewImageFromImage(img)
-
-	img, _, err = image.Decode(bytes.NewReader(flyeye_img2))
-	if err != nil {
-		log.Fatal(err)
-	}
-	flyeyeImage2 = ebiten.NewImageFromImage(img)
-
-	img, _, err = image.Decode(bytes.NewReader(flyeye_img3))
-	if err != nil {
-		log.Fatal(err)
-	}
-	flyeyeImage3 = ebiten.NewImageFromImage(img)
-
-	img, _, err = image.Decode(bytes.NewReader(shadow_img))
-	if err != nil {
-		log.Fatal(err)
-	}
-	shadow = ebiten.NewImageFromImage(img)
-}
-
-type Mover struct {
-	Sprite     *ebiten.Image
-	Maks       *ebiten.Image
-	MaksDest   *ebiten.Image
-	Angle      float64
-	Pos        Coordinates
-	Origin     Coordinates
-	Action     MoverAction
-	cycles     int
-	rotating   bool
-	Toggled    bool
-	Hit        bool
-	Touched    bool
-	dyingcount int
-}
-
-func NewMover() *Mover {
-	m := &Mover{
-		Sprite:     ebiten.NewImage(48, 48),
-		Maks:       ebiten.NewImage(48, 48),
-		MaksDest:   ebiten.NewImage(48, 48),
-		Action:     MoverActionDefault,
-		cycles:     4,
-		Angle:      0,
-		rotating:   false,
-		Toggled:    false,
-		dyingcount: 0,
-	}
-
-	m.Maks.Fill(color.White)
-	return m
-}
-
-func (m *Mover) ToggleRotate() {
-	m.rotating = !m.rotating
-}
-
-func (m *Mover) SetAngle(a float64) {
-	m.Angle = a
-}
-
-func (m *Mover) SetOrigin(coords Coordinates) {
-	m.Origin = coords
-	m.Pos = coords
-}
-
-func (m *Mover) Draw() {
-	m.Sprite.Clear()
-	m.MaksDest.Clear()
-
-	idx := (m.cycles / 8) % 4
-
-	y0 := 0
-	y1 := 48
-	x0 := 48 * idx
-	x1 := x0 + 48
-
-	switch m.Action {
-	case MoverActionDefault:
-		op := &ebiten.DrawImageOptions{}
-		op.GeoM.Translate(14, 40)
-		m.Sprite.DrawImage(shadow, op)
-		m.Sprite.DrawImage(flyeyeImage.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
-	case MoverActionDamaged:
-		op := &ebiten.DrawImageOptions{}
-		op.GeoM.Translate(14, 40)
-		m.Sprite.DrawImage(shadow, op)
-		m.Sprite.DrawImage(flyeyeImage2.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
-	case MoverActionDying:
-
-		if (m.cycles/5)%2 == 0 {
-
-			m.MaksDest.DrawImage(flyeyeImage2.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
-			op := &ebiten.DrawImageOptions{}
-			op.GeoM.Reset()
-			op.Blend = ebiten.BlendSourceAtop
-			m.MaksDest.DrawImage(m.Maks, op)
-			m.Sprite.DrawImage(m.MaksDest, nil)
-
-		} else {
-			m.Sprite.DrawImage(flyeyeImage2.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
-		}
-		if m.dyingcount >= 31 {
-			m.cycles = 0
-			m.SetHit()
-		}
-	case MoverActionExploding:
-		m.Sprite.DrawImage(flyeyeImage3.SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), nil)
-		if idx == 3 {
-			m.SetHit()
-		}
-	default:
-	}
-}
-
-func (m *Mover) Update() {
-	/*
-		dx := 0. //40 * math.Cos(float64(m.cycles)/16)
-		dy := 0. //40 * math.Sin(float64(m.cycles)/16)
-
-		m.Pos = Coordinates{X: m.Origin.X + dx, Y: m.Origin.Y + dy}
-	*/
-	/*
-		if m.rotating {
-			m.Angle = float64(m.cycles) / (math.Pi * 2)
-		}
-	*/
-	if m.Action == MoverActionDying {
-		m.dyingcount++
-	}
-	m.cycles++
-}
-
-func (m *Mover) SetHit() {
-	m.Action++ // = (m.Action + 1) % MoverActionMax
-}
-
-func (m *Mover) ToggleColor() {
-	//m.Toggled = !m.Toggled
-	if m.Action == MoverActionDefault {
-		m.Action = MoverActionDamaged
-	} else if m.Action == MoverActionDamaged {
-		m.Action = MoverActionDefault
-	}
-}

screenmanager/manager.go

@@ -0,0 +1,136 @@
+package screenmanager
+
+import (
+	"mover/gamedata"
+	"mover/screens"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const (
+	defaultWidth  = 1024
+	defaultHeight = 768
+)
+
+type Manager struct {
+	Info           gamedata.GameInfo
+	currentScene   screens.Screen
+	currentSceneId uint
+	nextSceneId    uint
+	screens        []screens.Screen
+	internalerr    error
+}
+
+// can be used to create default manager instance
+func NewManager() Manager {
+	return Manager{
+		Info: gamedata.GameInfo{
+			Name:    "survive",
+			Version: "0.34",
+			Dimensions: gamedata.Area{
+				Width:  defaultWidth,
+				Height: defaultHeight,
+			},
+		},
+		currentSceneId: 0,
+		nextSceneId:    1,
+		internalerr:    nil,
+	}
+}
+
+// ebitengine update proxy on behalf of current scene
+func (m *Manager) Update() error {
+	if m.currentScene == nil {
+		return nil
+	}
+
+	err := m.currentScene.Update()
+	if err != nil {
+		return err
+	}
+
+	return m.internalerr
+}
+
+// shutdown application
+func (m *Manager) Quit() {
+	m.internalerr = ebiten.Termination
+}
+
+// calls current scene's draw method if the currentscene is valid
+func (m *Manager) Draw(screen *ebiten.Image) {
+	if m.currentScene != nil {
+		m.currentScene.Draw(screen)
+	}
+}
+
+// ebitengine proxy for layout
+func (m *Manager) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
+	return m.Info.Dimensions.Width, m.Info.Dimensions.Height
+}
+
+// appends scene to the managed screens
+func (m *Manager) AddScene(s screens.Screen) {
+	setDefaultHandlers(m, s)
+	s.SetDimensions(m.Info.Dimensions)
+	m.screens = append(m.screens, s)
+}
+
+// sets the default callback handlers for a given scene within manager
+// Default Handling behaviours:
+//
+//	reset: sets (scene, nextscene) to {0, 1}
+//	scene completion: sets (scene, nextscene) to {nextscene, nextscene+1}
+//	end game: shutdown groovy
+//
+//	note: NOOP and RELOAD are purposefully not mapped; they are scene
+//	specific and should be mapped to by user of groovy
+func setDefaultHandlers(m *Manager, s screens.Screen) {
+	s.SetEventHandler(screens.EventReset, func() { m.ResetScenes() })
+	s.SetEventHandler(screens.EventCompleted, func() { m.TransitionScene() })
+	s.SetEventHandler(screens.EventEndgame, func() { m.Quit() })
+}
+
+// we're going to reset the scene to the first one
+func (m *Manager) ResetScenes() {
+	m.currentSceneId = 0
+	m.nextSceneId = 1
+	m.SetCurrentScene(0)
+}
+
+// sets the current scene, based on sceneindex n
+// n > scenelist, quit
+// otherwise, scene = n
+func (m *Manager) SetCurrentScene(sceneId uint) {
+	if sceneId >= uint(len(m.screens)) {
+		m.Quit()
+	} else {
+		m.currentSceneId = sceneId
+		m.currentScene = m.screens[sceneId]
+		m.nextSceneId = m.currentSceneId + 1
+	}
+}
+
+// handle scene transition
+func (m *Manager) TransitionScene() {
+	m.SetCurrentScene(m.nextSceneId)
+}
+
+// set new sceneId as the successor
+func (m *Manager) SetNextScene(sceneId uint) {
+	m.nextSceneId = sceneId
+}
+
+// sets sene dimensions
+func (m *Manager) SetDimensions(a gamedata.Area) {
+	m.Info.Dimensions = a
+}
+
+// report number of total screens
+func (m *Manager) SceneCount() uint {
+	return uint(len(m.screens))
+}
+
+func (m *Manager) GetScene(sceneId uint) screens.Screen {
+	return m.screens[sceneId]
+}

screens/game.go

@@ -0,0 +1,729 @@
+package screens
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"math"
+	"math/rand/v2"
+	"mover/assets"
+	"mover/elements"
+	"mover/fonts"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/audio"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+	"github.com/hajimehoshi/ebiten/v2/text"
+	"github.com/hajimehoshi/ebiten/v2/vector"
+)
+
+const (
+	MOVER_WIDTH  = 48
+	MOVER_HEIGHT = 48
+	sampleRate   = 44100
+)
+
+type Game struct {
+	events            map[ScreenManagerEvent]func()
+	background        *ebiten.Image
+	collisionMask     *ebiten.Image
+	projectileMask    *ebiten.Image
+	heroCollisionMask *ebiten.Image
+	heroCollisionCpy  *ebiten.Image
+
+	dimensions       gamedata.Area
+	Pos              gamedata.Coordinates
+	Paused           bool
+	initialized      bool
+	gameover         bool
+	reset            bool
+	musicInitialized bool
+	runtime          float64
+	hero             *elements.Hero
+	projectiles      map[int]*elements.Projectile
+	explosion        *elements.Explosion
+	audioplayer      *audio.Player
+
+	score   int
+	counter int
+	timer   int
+	targets []*elements.Mover
+	boss    *elements.Boss
+}
+
+var (
+	audioContext = audio.NewContext(sampleRate)
+)
+
+func NewGame() *Game {
+	g := &Game{
+		events:           make(map[ScreenManagerEvent]func()),
+		musicInitialized: false,
+		boss:             elements.NewBoss(),
+	}
+
+	return g
+}
+
+func (g *Game) Initialize() {
+
+	if !g.musicInitialized {
+		s := audio.NewInfiniteLoop(assets.SoundBank[assets.MainLoop], assets.SoundBank[assets.MainLoop].Length())
+		g.audioplayer, _ = audioContext.NewPlayer(s)
+		g.audioplayer.Play()
+		g.musicInitialized = true
+	}
+
+	origin := gamedata.Coordinates{X: 640 / 2, Y: 480 / 2}
+
+	g.ConstructBackground()
+	g.hero = elements.NewHero()
+	g.hero.SetOrigin(origin)
+	g.hero.ToggleRotate()
+
+	g.gameover = false
+
+	g.collisionMask = ebiten.NewImage(g.dimensions.Width, g.dimensions.Height)
+	g.projectileMask = ebiten.NewImage(g.dimensions.Width, g.dimensions.Height)
+	g.heroCollisionMask = ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT)
+	g.heroCollisionCpy = ebiten.NewImage(MOVER_WIDTH, MOVER_HEIGHT)
+
+	g.explosion = elements.NewExplosion()
+	g.explosion.SetOrigin(origin)
+	g.score = 0
+	g.reset = false
+
+	//clean up all targets
+	for j := 0; j < len(g.targets); j++ {
+		g.targets[j] = nil
+	}
+	g.targets = g.targets[:0]
+
+	g.score = 0
+	g.counter = 0
+	g.timer = 0
+	g.runtime = 0.
+
+	g.boss.Reset()
+
+	g.projectiles = make(map[int]*elements.Projectile)
+	g.initialized = true
+	g.reset = false
+
+}
+
+func (g *Game) Update() error {
+	if !g.initialized || g.reset {
+		g.Initialize()
+	} else {
+		g.StepGame()
+	}
+
+	g.timer++
+
+	return nil
+}
+
+func (g *Game) Draw(screen *ebiten.Image) {
+
+	screen.Clear()
+
+	if g.initialized {
+		screen.DrawImage(g.background, nil)
+
+		g.hero.Draw()
+
+		op := &ebiten.DrawImageOptions{}
+
+		if !g.gameover {
+			g.runtime = float64(g.counter) / 60.
+		}
+
+		op.GeoM.Translate(-MOVER_WIDTH/2, -MOVER_HEIGHT/2)
+		op.GeoM.Translate(g.hero.Pos.X, g.hero.Pos.Y)
+		screen.DrawImage(g.hero.Sprite, op)
+
+		op.GeoM.Reset()
+		op.GeoM.Translate(0, -16)
+		op.GeoM.Rotate(g.hero.Angle)
+		op.GeoM.Translate(g.hero.Pos.X, g.hero.Pos.Y)
+		screen.DrawImage(assets.ImageBank[assets.Weapon], op)
+
+		//secondary/upgraded weapon sprite; in testing proves sort of distracting
+		/*
+			if g.hero.Upgrade {
+				op.GeoM.Reset()
+				op.GeoM.Translate(-16, -16)
+				op.GeoM.Scale(0.75, 0.75)
+				op.GeoM.Translate(16, 0)
+				op.GeoM.Rotate(g.hero.Angle + math.Pi)
+				op.GeoM.Translate(g.hero.Pos.X, g.hero.Pos.Y)
+				screen.DrawImage(weaponImage, op)
+			}
+		*/
+
+		//draw shadows--------------------------------------------------------------
+		for _, target := range g.targets {
+			if target.Action < elements.MoverActionExploding {
+				op := &ebiten.DrawImageOptions{}
+				op.GeoM.Translate(target.Pos.X-10, target.Pos.Y+10)
+				screen.DrawImage(assets.ImageBank[assets.FlyEyeShadow], op)
+			}
+		}
+
+		if g.boss.Spawned && g.boss.Action < elements.MoverActionExploding {
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Scale(4, 2)
+			op.GeoM.Translate(g.boss.Pos.X-96/2, g.boss.Pos.Y+96/2-10)
+			screen.DrawImage(assets.ImageBank[assets.FlyEyeShadow], op)
+		}
+
+		//draw enemies--------------------------------------------------------------
+		for _, target := range g.targets {
+			target.Draw()
+
+			op.GeoM.Reset()
+			op.GeoM.Translate(-MOVER_WIDTH/2, -MOVER_HEIGHT/2)
+			op.GeoM.Rotate(target.Angle)
+			op.GeoM.Translate(target.Pos.X, target.Pos.Y)
+			screen.DrawImage(target.Sprite, op)
+		}
+
+		if g.boss.Spawned {
+			g.boss.Draw()
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Translate(-MOVER_WIDTH, -MOVER_HEIGHT)
+			op.GeoM.Translate(g.boss.Pos.X, g.boss.Pos.Y)
+			screen.DrawImage(g.boss.Sprite, op)
+
+			//text.Draw(screen, fmt.Sprintf("%d", g.boss.Health), fonts.SurviveFont.Arcade, 100, 50, color.White)
+
+			//boss health bar
+			x0 := g.boss.Pos.X - 96
+			y0 := g.boss.Pos.Y - 60
+			vector.DrawFilledRect(screen, float32(x0), float32(y0), 204, 12, color.Black, true)
+			vector.DrawFilledRect(screen, float32(x0+2), float32(y0+2), float32(g.boss.Health)*2, 8, color.RGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, true)
+		}
+
+		g.projectileMask.Clear()
+
+		for _, p := range g.projectiles {
+			vector.DrawFilledCircle(g.projectileMask, float32(p.Pos.X), float32(p.Pos.Y), 3, color.White, true)
+		}
+
+		screen.DrawImage(g.projectileMask, nil)
+
+		/*
+			op.GeoM.Reset()
+			op.GeoM.Scale(0.25, 0.25)
+			screen.DrawImage(g.collisionMask, op)
+		*/
+
+		vector.StrokeCircle(screen, float32(g.explosion.Origin.X), float32(g.explosion.Origin.Y), float32(g.explosion.Radius), 3, color.White, true)
+
+		s := fmt.Sprintf("%02.3f", g.runtime)
+		if !g.gameover {
+			text.Draw(screen, "TIME: "+s, fonts.SurviveFont.Arcade, 640/2-250, 25, color.White)
+			text.Draw(screen, fmt.Sprintf("SCORE: %d", g.score*10), fonts.SurviveFont.Arcade, 640/2+100, 25, color.White)
+		} else {
+			if (g.counter/30)%2 == 0 {
+				text.Draw(screen, "TIME: "+s, fonts.SurviveFont.Arcade, 640/2-250, 25, color.White)
+				text.Draw(screen, fmt.Sprintf("SCORE: %d", g.score*10), fonts.SurviveFont.Arcade, 640/2+100, 25, color.White)
+			}
+
+			text.Draw(screen, "PRESS START TO TRY AGAIN", fonts.SurviveFont.Arcade, 640/2-150, 480/2, color.White)
+		}
+	}
+}
+
+func (g *Game) Layout(width, height int) (int, int) {
+	return g.dimensions.Width, g.dimensions.Height
+}
+
+func (g *Game) CleanupTargets() {
+	// remove dead targets by 1) iterating over all targets
+	i := 0
+	for _, target := range g.targets {
+		//moving valid targets to the front of the slice
+		if target.Action < elements.MoverActionDead {
+			g.targets[i] = target
+			i++
+		}
+	}
+
+	//then culling the last elements of the slice
+	if len(g.targets)-i > 0 {
+		//	fmt.Printf("Removing %d elements\n", len(g.targets)-i)
+		g.score += len(g.targets) - i
+	}
+
+	for j := i; j < len(g.targets); j++ {
+		g.targets[j] = nil
+	}
+	g.targets = g.targets[:i]
+}
+
+func (g *Game) StepGame() {
+
+	g.HandleInput()
+
+	if !g.Paused {
+
+		if !g.audioplayer.IsPlaying() {
+			g.audioplayer.Play()
+		}
+
+		g.hero.Update()
+		g.explosion.Update()
+
+		g.UpdateTargets()
+		if g.boss.Spawned {
+			g.UpdateBoss()
+		}
+
+		g.UpdateProjectiles()
+
+		if !g.gameover {
+			g.UpdateHeroPosition()
+			//append new projectiles
+			g.AppendProjectiles()
+
+			//handle pulsewave updates
+			g.HandlePulseWaveUpdate()
+
+			if !g.boss.Spawned {
+				//add new target with increasing frequency
+				g.SpawnEnemies()
+				if g.counter > 2000 {
+					g.SpawnBoss()
+				}
+			}
+
+		}
+
+		g.CleanupTargets()
+		g.counter++
+	} else {
+		g.audioplayer.Pause()
+	}
+}
+
+func (g *Game) SpawnEnemies() {
+	f := 40000 / (g.counter + 1)
+	if g.counter%f == 0 {
+		g.targets = append(g.targets, elements.NewMover())
+
+		x0 := rand.Float64() * 640
+		y0 := rand.Float64() * 480
+		quadrant := rand.IntN(3)
+
+		switch quadrant {
+		case 0:
+			g.targets[len(g.targets)-1].SetOrigin(gamedata.Coordinates{X: x0, Y: -MOVER_HEIGHT})
+		case 1:
+			g.targets[len(g.targets)-1].SetOrigin(gamedata.Coordinates{X: x0, Y: float64(g.dimensions.Height) + MOVER_HEIGHT})
+		case 2:
+			g.targets[len(g.targets)-1].SetOrigin(gamedata.Coordinates{X: -MOVER_WIDTH, Y: y0})
+		case 3:
+			g.targets[len(g.targets)-1].SetOrigin(gamedata.Coordinates{X: float64(g.dimensions.Width) + x0, Y: y0})
+		default:
+			g.targets[len(g.targets)-1].SetOrigin(gamedata.Coordinates{X: x0, Y: y0})
+			fmt.Println("WTF " + string(quadrant))
+		}
+
+	}
+}
+
+func (g *Game) HandlePulseWaveUpdate() {
+	if g.explosion.Active {
+		if g.explosion.Radius > math.Sqrt(640*640+480*480) {
+			g.explosion.ToggleActivate()
+			g.explosion.Reset()
+			g.ResetTargetTouches()
+		}
+
+		//check collisions
+		for _, target := range g.targets {
+			dx := target.Pos.X - g.hero.Pos.X
+			dy := target.Pos.Y - g.hero.Pos.Y
+			r := math.Sqrt(dx*dx + dy*dy)
+
+			if r >= g.explosion.Radius-5 && r <= g.explosion.Radius+5 &&
+				target.Action <= elements.MoverActionDamaged && !target.Touched {
+				target.ToggleColor()
+				target.Touched = true
+				//target.SetHit()
+			}
+		}
+
+		//check for boss
+		if g.boss.Spawned {
+			dx := g.boss.Pos.X - g.hero.Pos.X
+			dy := g.boss.Pos.Y - g.hero.Pos.Y
+			r := math.Sqrt(dx*dx + dy*dy)
+
+			if r >= g.explosion.Radius-40 && r <= g.explosion.Radius+40 &&
+				g.boss.Action <= elements.MoverActionDamaged && !g.boss.Touched {
+				g.boss.ToggleColor()
+				g.boss.Touched = true
+				//target.SetHit()
+			}
+		}
+	}
+}
+
+func (g *Game) UpdateProjectiles() {
+	for k, p := range g.projectiles {
+
+		p.Update()
+
+		//cleanup projectiles at boundaries
+		if p.Pos.X < -640/2 || p.Pos.X > 1.5*640 || p.Pos.Y < -480/2 || p.Pos.Y > 1.5*480 {
+			p.Velocity = 0
+			delete(g.projectiles, k)
+		}
+
+		//compute projectile collisions
+		for _, target := range g.targets {
+			//first, boundary check
+			if p.Pos.X >= target.Pos.X-MOVER_WIDTH/2 && p.Pos.X <= target.Pos.X+MOVER_WIDTH/2 &&
+				p.Pos.Y >= target.Pos.Y-MOVER_HEIGHT/2 && p.Pos.Y <= target.Pos.Y+MOVER_HEIGHT/2 &&
+				target.Action == elements.MoverActionDamaged {
+				//fmt.Println("potential collision")
+
+				//the following computes total collisions in the image using a projectile mask that is a duplicate of what is on screen
+				//there's definitely room for optimization here
+				g.collisionMask.Clear()
+				g.collisionMask.DrawImage(g.projectileMask, nil)
+
+				op := &ebiten.DrawImageOptions{}
+				op.GeoM.Reset()
+				op.Blend = ebiten.BlendSourceIn
+				op.GeoM.Translate(target.Pos.X-MOVER_WIDTH/2, target.Pos.Y-MOVER_HEIGHT/2)
+				g.collisionMask.DrawImage(target.Sprite, op)
+
+				if g.HasCollided(g.collisionMask, g.dimensions.Width*g.dimensions.Height*4) {
+					//fmt.Println("pixel collision")
+					delete(g.projectiles, k)
+					//target.ToggleColor()
+					target.SetHit()
+					//target.SetOrigin(gamedata.Coordinates{X: rand.Float64() * 640, Y: rand.Float64() * 480})
+					target.Hit = true
+
+					player := audioContext.NewPlayerFromBytes(assets.TargetHit)
+					player.Play()
+				}
+			}
+		}
+
+		//boss check: first, boundary check
+		if p.Pos.X >= g.boss.Pos.X-MOVER_WIDTH && p.Pos.X <= g.boss.Pos.X+MOVER_WIDTH &&
+			p.Pos.Y >= g.boss.Pos.Y-MOVER_HEIGHT && p.Pos.Y <= g.boss.Pos.Y+MOVER_HEIGHT &&
+			g.boss.Action == elements.MoverActionDamaged {
+			//fmt.Println("potential collision")
+
+			//the following computes total collisions in the image using a projectile mask that is a duplicate of what is on screen
+			//there's definitely room for optimization here
+			g.collisionMask.Clear()
+			g.collisionMask.DrawImage(g.projectileMask, nil)
+
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Reset()
+			op.Blend = ebiten.BlendSourceIn
+			op.GeoM.Translate(g.boss.Pos.X-MOVER_WIDTH/2, g.boss.Pos.Y-MOVER_HEIGHT/2)
+			g.collisionMask.DrawImage(g.boss.Sprite, op)
+
+			if g.HasCollided(g.collisionMask, g.dimensions.Width*g.dimensions.Height*4) {
+				//fmt.Println("pixel collision")
+				delete(g.projectiles, k)
+				//target.ToggleColor()
+				g.boss.SetHit()
+				//target.SetOrigin(gamedata.Coordinates{X: rand.Float64() * 640, Y: rand.Float64() * 480})
+				//g.boss.Hit = true
+
+				player := audioContext.NewPlayerFromBytes(assets.TargetHit)
+				player.Play()
+			}
+		}
+	}
+
+}
+
+func (g *Game) UpdateTargets() {
+	for _, target := range g.targets {
+
+		if target.Action == elements.MoverActionExploding && !target.SplodeInitiated {
+			player := audioContext.NewPlayerFromBytes(assets.Splode)
+			player.Play()
+			target.SplodeInitiated = true
+		}
+
+		if !target.Hit && g.hero.Action < elements.HeroActionDying {
+			dx := g.hero.Pos.X - target.Pos.X
+			dy := g.hero.Pos.Y - target.Pos.Y
+			angle := math.Atan2(dy, dx)
+
+			//maxspeed := (float64(g.counter) + 1.) / 1000.
+			maxspeed := 2.9
+			target.Pos.X += maxspeed * math.Cos(angle)
+			target.Pos.Y += maxspeed * math.Sin(angle)
+		}
+
+		//compute collision with hero
+		if g.hero.Pos.X >= target.Pos.X-MOVER_WIDTH/2 && g.hero.Pos.X <= target.Pos.X+MOVER_WIDTH/2 &&
+			g.hero.Pos.Y >= target.Pos.Y-MOVER_HEIGHT/2 && g.hero.Pos.Y <= target.Pos.Y+MOVER_HEIGHT/2 &&
+			target.Action < elements.MoverActionDying && g.hero.Action < elements.HeroActionDying {
+			g.heroCollisionMask.Clear()
+			g.heroCollisionMask.DrawImage(g.hero.Sprite, nil)
+
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Reset()
+			op.Blend = ebiten.BlendSourceIn
+			op.GeoM.Translate((g.hero.Pos.X-target.Pos.X)-MOVER_WIDTH/2, (g.hero.Pos.Y-target.Pos.Y)-MOVER_HEIGHT/2)
+			g.heroCollisionMask.DrawImage(target.Sprite, op)
+
+			if g.HasCollided(g.heroCollisionMask, MOVER_HEIGHT*MOVER_HEIGHT*4) {
+				g.hero.SetHit()
+				g.gameover = true
+
+				player := audioContext.NewPlayerFromBytes(assets.HeroDeath)
+				player.Play()
+			}
+		}
+
+		target.Update()
+	}
+}
+
+func (g *Game) ResetTargetTouches() {
+	for _, t := range g.targets {
+		t.Touched = false
+	}
+	g.boss.Touched = false
+}
+
+func (g *Game) AppendProjectiles() {
+	if g.counter%14 == 0 && ebiten.IsStandardGamepadButtonPressed(0, ebiten.StandardGamepadButtonFrontBottomRight) {
+
+		g.projectiles[g.counter] = elements.NewProjectile(gamedata.Coordinates{X: g.hero.Pos.X, Y: g.hero.Pos.Y}, g.hero.Angle, 5.)
+
+		if g.hero.Upgrade {
+			g.projectiles[g.counter+1] = elements.NewProjectile(gamedata.Coordinates{X: g.hero.Pos.X, Y: g.hero.Pos.Y}, g.hero.Angle+math.Pi, 5.)
+		}
+
+		player := audioContext.NewPlayerFromBytes(assets.Shot)
+		player.Play()
+	}
+}
+
+func (g *Game) HandleInput() {
+	//if len(g.gamepadIDs) > 0 {
+	if inpututil.IsStandardGamepadButtonJustPressed(0, ebiten.StandardGamepadButtonRightStick) {
+		if !g.explosion.Active && !g.gameover {
+			g.explosion.SetOrigin(g.hero.Pos)
+			g.explosion.Reset()
+			g.explosion.ToggleActivate()
+			player := audioContext.NewPlayerFromBytes(assets.Magic)
+			player.Play()
+		}
+	}
+
+	if inpututil.IsStandardGamepadButtonJustPressed(0, ebiten.StandardGamepadButtonCenterRight) {
+		if g.gameover {
+			g.reset = true
+		} else {
+			g.Paused = !g.Paused
+			var player *audio.Player
+			if g.Paused {
+				player = audioContext.NewPlayerFromBytes(assets.PauseIn)
+			} else {
+				player = audioContext.NewPlayerFromBytes(assets.PauseOut)
+			}
+			player.Play()
+		}
+	}
+
+	//account for controller sensitivity
+	if !g.gameover && !g.Paused {
+		xaxis := ebiten.StandardGamepadAxisValue(0, ebiten.StandardGamepadAxisRightStickHorizontal)
+		yaxis := ebiten.StandardGamepadAxisValue(0, ebiten.StandardGamepadAxisRightStickVertical)
+
+		if yaxis <= 0.09 && yaxis >= -0.09 {
+			yaxis = 0
+		}
+		if xaxis <= 0.09 && xaxis >= -0.09 {
+			xaxis = 0
+		}
+
+		inputangle := math.Atan2(yaxis, xaxis)
+		g.hero.SetAngle(inputangle)
+	}
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyQ) {
+		g.events[EventEndgame]()
+	}
+	//}
+}
+
+func (g *Game) UpdateHeroPosition() {
+	//handle gamepad input
+	inpx := ebiten.GamepadAxisValue(0, 0)
+	inpy := ebiten.GamepadAxisValue(0, 1)
+
+	//handle wasd input
+	if ebiten.IsKeyPressed(ebiten.KeyD) {
+		inpx = 1
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyA) {
+		inpx = -1
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyS) {
+		inpy = 1
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyW) {
+		inpy = -1
+	}
+
+	if inpx >= 0.15 || inpx <= -0.15 {
+		g.hero.Left = inpx < 0
+		g.hero.Pos.X += inpx * 5
+	}
+
+	if inpy >= 0.15 || inpy <= -0.15 {
+		g.hero.Pos.Y += inpy * 5
+	}
+
+}
+
+func (g *Game) ConstructBackground() {
+	g.background = ebiten.NewImage(g.dimensions.Width, g.dimensions.Height)
+	BLOCK_SIZE := 32
+
+	for i := 0; i < 640/BLOCK_SIZE; i++ {
+		for j := 0; j < 480/BLOCK_SIZE; j++ {
+
+			//select random tile in x and y from tileset
+			idx_y := rand.IntN(256 / BLOCK_SIZE)
+			idx_x := rand.IntN(256 / BLOCK_SIZE)
+
+			x0 := BLOCK_SIZE * idx_x
+			y0 := BLOCK_SIZE * idx_y
+			x1 := x0 + BLOCK_SIZE
+			y1 := y0 + BLOCK_SIZE
+
+			//translate for grid element we're painting
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Translate(float64(i*BLOCK_SIZE), float64(j*BLOCK_SIZE))
+			g.background.DrawImage(assets.ImageBank[assets.TileSet].SubImage(image.Rect(x0, y0, x1, y1)).(*ebiten.Image), op)
+		}
+	}
+
+	ax := float64(rand.IntN(640/BLOCK_SIZE) * BLOCK_SIZE)
+	ay := float64(rand.IntN(480/BLOCK_SIZE) * BLOCK_SIZE)
+
+	op := &ebiten.DrawImageOptions{}
+	op.GeoM.Translate(ax, ay)
+	g.background.DrawImage(assets.ImageBank[assets.Altar], op)
+}
+
+func (g *Game) SetDimensions(a gamedata.Area) {
+	g.dimensions = a
+}
+
+func (g *Game) SetEventHandler(e ScreenManagerEvent, f func()) {
+	g.events[e] = f
+}
+
+func (g *Game) SpawnBoss() {
+	x0 := rand.Float64() * 640
+	y0 := rand.Float64() * 480
+	quadrant := rand.IntN(3)
+
+	switch quadrant {
+	case 0:
+		g.boss.Pos = gamedata.Coordinates{X: x0, Y: -(MOVER_HEIGHT * 2)}
+	case 1:
+		g.boss.Pos = gamedata.Coordinates{X: x0, Y: float64(g.dimensions.Height) + (MOVER_HEIGHT * 2)}
+	case 2:
+		g.boss.Pos = gamedata.Coordinates{X: -(MOVER_HEIGHT * 2), Y: y0}
+	case 3:
+		g.boss.Pos = gamedata.Coordinates{X: float64(g.dimensions.Width) + x0, Y: y0}
+	default:
+		g.boss.Pos = gamedata.Coordinates{X: x0, Y: y0}
+		fmt.Println("WTF " + string(quadrant))
+	}
+	//g.boss.Pos = gamedata.Coordinates{X: 640 / 2, Y: 480 / 2}
+	g.boss.Spawned = true
+}
+
+func (g *Game) UpdateBoss() {
+	g.boss.Update()
+
+	if g.boss.Action == elements.MoverActionExploding && !g.boss.SplodeInitiated {
+		g.score += 10
+		player := audioContext.NewPlayerFromBytes(assets.Splode)
+		player.Play()
+		g.boss.SplodeInitiated = true
+	}
+	/*
+		if g.boss.Action >= elements.MoverActionDying {
+			g.boss.Spawned = false
+		}*/
+
+	if g.boss.Action >= elements.MoverActionDead {
+		g.boss.Pos = gamedata.Coordinates{X: -96, Y: -96}
+	}
+
+	if g.boss.Action < elements.MoverActionDying {
+		dx := g.hero.Pos.X - g.boss.Pos.X
+		dy := g.hero.Pos.Y - g.boss.Pos.Y
+
+		g.boss.Right = dx/48 > 0
+
+		g.boss.Pos = gamedata.Coordinates{
+			X: g.boss.Pos.X + dx/48,
+			Y: g.boss.Pos.Y + dy/48,
+		}
+	}
+
+	//compute collision with hero
+	if g.hero.Pos.X >= g.boss.Pos.X-MOVER_WIDTH && g.hero.Pos.X <= g.boss.Pos.X+MOVER_WIDTH &&
+		g.hero.Pos.Y >= g.boss.Pos.Y-MOVER_HEIGHT && g.hero.Pos.Y <= g.boss.Pos.Y+MOVER_HEIGHT &&
+		g.boss.Action < elements.MoverActionDying && g.hero.Action < elements.HeroActionDying {
+		g.heroCollisionMask.Clear()
+		g.heroCollisionMask.DrawImage(g.hero.Sprite, nil)
+
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Reset()
+		op.Blend = ebiten.BlendSourceIn
+		op.GeoM.Translate((g.hero.Pos.X-g.boss.Pos.X)-MOVER_WIDTH, (g.hero.Pos.Y-g.boss.Pos.Y)-MOVER_HEIGHT)
+		g.heroCollisionMask.DrawImage(g.boss.Sprite, op)
+
+		if g.HasCollided(g.heroCollisionMask, MOVER_HEIGHT*MOVER_HEIGHT*4) {
+			g.hero.SetHit()
+			g.gameover = true
+
+			player := audioContext.NewPlayerFromBytes(assets.HeroDeath)
+			player.Play()
+		}
+
+	}
+}
+
+func (g *Game) HasCollided(mask *ebiten.Image, size int) bool {
+	var result bool = false
+	var pixels []byte = make([]byte, size)
+	mask.ReadPixels(pixels)
+	for i := 0; i < len(pixels); i = i + 4 {
+		if pixels[i+3] != 0 {
+			result = true
+			break
+		}
+	}
+	return result
+}
+
+func (g *Game) SetInputs(gamedata.GameInputs) {
+
+}

screens/primary.go

@@ -0,0 +1,250 @@
+package screens
+
+import (
+	"math"
+	"mover/assets"
+	"mover/gamedata"
+	"mover/gameelement"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/audio"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+type Primary struct {
+	events     map[ScreenManagerEvent]func()
+	dimensions gamedata.Area
+	elements   []gameelement.GameElement
+	gameevents map[gamedata.GameEvent]bool
+
+	paused           bool
+	gameover         bool
+	musicInitialized bool
+
+	audioplayer *audio.Player
+}
+
+func NewPrimary() *Primary {
+	p := &Primary{
+		events:           make(map[ScreenManagerEvent]func()),
+		paused:           false,
+		gameover:         false,
+		musicInitialized: false,
+	}
+
+	gamearea := gamedata.Area{Width: 640, Height: 480}
+
+	//initialize our layer map
+	p.gameevents = make(map[gamedata.GameEvent]bool)
+
+	//create background layer
+	p.elements = append(p.elements, gameelement.NewBackground(gamearea))
+
+	//create canvas (game) layer
+	canvas := gameelement.NewCanvas(gamearea)
+	canvas.RegisterEvents(gamedata.GameEventPlayerDeath, p.EventHandlerPlayerDeath)
+	canvas.RegisterEvents(gamedata.GameEventCharge, p.EventHandlerCharge)
+	canvas.RegisterEvents(gamedata.GameEventNewShot, p.EventHandlerNewShot)
+	canvas.RegisterEvents(gamedata.GameEventTargetHit, p.EventHandlerTargetHit)
+	canvas.RegisterEvents(gamedata.GameEventExplosion, p.EventHandlerExplosion)
+	canvas.RegisterEvents(gamedata.GameEventFireball, p.EventHandlerFireball)
+	p.elements = append(p.elements, canvas)
+
+	//rainlayer
+	rain := gameelement.NewRainLayer(gamearea)
+	rain.Initialize()
+	p.elements = append(p.elements, rain)
+
+	//create foreground cloud layer
+	clouds := gameelement.NewCloudLayer(gamearea)
+	clouds.Initialize()
+	p.elements = append(p.elements, clouds)
+
+	return p
+}
+
+func (p *Primary) Update() error {
+
+	if !p.musicInitialized {
+		s := audio.NewInfiniteLoop(assets.SoundBank[assets.MainLoop], assets.SoundBank[assets.MainLoop].Length())
+		p.audioplayer, _ = audioContext.NewPlayer(s)
+		p.audioplayer.Play()
+		p.musicInitialized = true
+	}
+
+	//collect all inputs
+	inputs := p.CollectInputs()
+	if inputs.Quit {
+		p.events[EventEndgame]()
+	}
+
+	if inputs.Reset {
+		p.Reset()
+	}
+
+	p.ProcessEventAudio()
+
+	if inputs.Start {
+		if p.gameover {
+			p.Reset()
+		} else {
+			p.TogglePause()
+		}
+	}
+
+	//primary game loop, for each element pass along the inputs
+	//and process its update logic
+	if !p.paused {
+		for _, ge := range p.elements {
+			ge.SetInputs(inputs)
+			ge.Update()
+		}
+	}
+
+	return nil
+}
+
+func (p *Primary) Draw(screen *ebiten.Image) {
+	//here we simply call each game elements draw function
+	//as a layer on top of each other
+	for _, ge := range p.elements {
+		ge.Draw(screen)
+	}
+}
+
+func (p *Primary) SetEventHandler(e ScreenManagerEvent, f func()) {
+	p.events[e] = f
+}
+
+func (p *Primary) SetDimensions(a gamedata.Area) {
+	p.dimensions = a
+}
+
+func (p *Primary) CollectInputs() gamedata.GameInputs {
+	if inpututil.IsKeyJustPressed(ebiten.KeyQ) {
+		p.events[EventEndgame]()
+	}
+
+	gi := gamedata.GameInputs{}
+
+	//axes
+	inpx := ebiten.GamepadAxisValue(0, 0)
+	inpy := ebiten.GamepadAxisValue(0, 1)
+
+	//handle wasd input
+	if ebiten.IsKeyPressed(ebiten.KeyD) {
+		inpx = 1
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyA) {
+		inpx = -1
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyS) {
+		inpy = 1
+	}
+	if ebiten.IsKeyPressed(ebiten.KeyW) {
+		inpy = -1
+	}
+
+	gi.XAxis = inpx
+	gi.YAxis = inpy
+
+	xaxis := ebiten.StandardGamepadAxisValue(0, ebiten.StandardGamepadAxisRightStickHorizontal)
+	yaxis := ebiten.StandardGamepadAxisValue(0, ebiten.StandardGamepadAxisRightStickVertical)
+
+	if yaxis <= 0.09 && yaxis >= -0.09 {
+		yaxis = 0
+	}
+	if xaxis <= 0.09 && xaxis >= -0.09 {
+		xaxis = 0
+	}
+
+	gi.ShotAngle = math.Atan2(yaxis, xaxis)
+
+	gi.CycleWeapon = inpututil.IsStandardGamepadButtonJustPressed(0, ebiten.StandardGamepadButtonFrontTopRight)
+	gi.Charge = inpututil.IsStandardGamepadButtonJustPressed(0, ebiten.StandardGamepadButtonRightStick)
+	gi.Start = inpututil.IsStandardGamepadButtonJustPressed(0, ebiten.StandardGamepadButtonCenterRight)
+	gi.Shot = ebiten.IsStandardGamepadButtonPressed(0, ebiten.StandardGamepadButtonFrontBottomRight)
+	gi.Quit = inpututil.IsKeyJustPressed(ebiten.KeyQ)
+	gi.Reset = inpututil.IsKeyJustPressed(ebiten.KeyR)
+
+	return gi
+}
+
+func (p *Primary) TogglePause() {
+	p.paused = !p.paused
+	var player *audio.Player
+	if p.paused {
+		player = audioContext.NewPlayerFromBytes(assets.PauseIn)
+		p.audioplayer.Pause()
+	} else {
+		player = audioContext.NewPlayerFromBytes(assets.PauseOut)
+		p.audioplayer.Play()
+	}
+	player.Play()
+}
+
+func (p *Primary) Reset() {
+	p.paused = false
+	p.gameover = false
+
+	for _, ge := range p.elements {
+		ge.Initialize()
+	}
+}
+
+func (p *Primary) ProcessEventAudio() {
+	for event, occurred := range p.gameevents {
+		if occurred {
+			p.PlayAudio(event)
+			p.gameevents[event] = false
+		}
+	}
+}
+
+func (p *Primary) PlayAudio(e gamedata.GameEvent) {
+	switch e {
+	case gamedata.GameEventPlayerDeath:
+		player := audioContext.NewPlayerFromBytes(assets.HeroDeath)
+		player.Play()
+	case gamedata.GameEventCharge:
+		player := audioContext.NewPlayerFromBytes(assets.Magic)
+		player.Play()
+	case gamedata.GameEventNewShot:
+		player := audioContext.NewPlayerFromBytes(assets.Shot)
+		player.Play()
+	case gamedata.GameEventTargetHit:
+		player := audioContext.NewPlayerFromBytes(assets.TargetHit)
+		player.Play()
+	case gamedata.GameEventExplosion:
+		player := audioContext.NewPlayerFromBytes(assets.Splode)
+		player.Play()
+	case gamedata.GameEventFireball:
+		player := audioContext.NewPlayerFromBytes(assets.Flare)
+		player.Play()
+	}
+}
+
+func (p *Primary) EventHandlerPlayerDeath() {
+	p.gameevents[gamedata.GameEventPlayerDeath] = true
+	p.gameover = true
+}
+
+func (p *Primary) EventHandlerCharge() {
+	p.gameevents[gamedata.GameEventCharge] = true
+}
+
+func (p *Primary) EventHandlerNewShot() {
+	p.gameevents[gamedata.GameEventNewShot] = true
+}
+
+func (p *Primary) EventHandlerTargetHit() {
+	p.gameevents[gamedata.GameEventTargetHit] = true
+}
+
+func (p *Primary) EventHandlerExplosion() {
+	p.gameevents[gamedata.GameEventExplosion] = true
+}
+
+func (p *Primary) EventHandlerFireball() {
+	p.gameevents[gamedata.GameEventFireball] = true
+}

screens/scene.go

@@ -0,0 +1,25 @@
+package screens
+
+import (
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+type ScreenManagerEvent int
+
+const (
+	EventNoop      ScreenManagerEvent = iota
+	EventReset                        // reset to initial scene
+	EventLoad                         // loading elements
+	EventReload                       // reload current scene
+	EventCompleted                    // current scene has completed
+	EventEndgame                      // shutdown all scenes
+)
+
+type Screen interface {
+	Update() error
+	Draw(screen *ebiten.Image)
+	SetEventHandler(e ScreenManagerEvent, f func())
+	SetDimensions(a gamedata.Area)
+}

screens/start.go

@@ -0,0 +1,102 @@
+package screens
+
+import (
+	"image/color"
+	"math"
+	"mover/assets"
+	"mover/fonts"
+	"mover/gamedata"
+	"mover/touch"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/audio"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+	"github.com/hajimehoshi/ebiten/v2/text"
+)
+
+type StartScreen struct {
+	eHandler      map[ScreenManagerEvent]func()
+	dimensions    gamedata.Area
+	target        gamedata.Coordinates
+	current       gamedata.Coordinates
+	targetreached bool
+	audioplayed   bool
+	cycle         int
+	audioplayer   *audio.Player
+}
+
+func NewStartScreen() *StartScreen {
+	s := &StartScreen{
+		eHandler:      make(map[ScreenManagerEvent]func()),
+		target:        gamedata.Coordinates{X: 640/2 - 150, Y: 480 / 2},
+		current:       gamedata.Coordinates{X: 640/2 - 150, Y: -100},
+		targetreached: false,
+		cycle:         0,
+		audioplayed:   false,
+	}
+	return s
+}
+
+func (s *StartScreen) Update() error {
+
+	touch.UpdateTouchIDs()
+
+	ids := touch.GetTouchIDs()
+	var touched bool = false
+	for _, id := range ids {
+		touched = touch.IsTouchJustPressed(id)
+		if touched {
+			break
+		}
+	}
+
+	if inpututil.IsKeyJustPressed(ebiten.KeyEnter) ||
+		ebiten.IsStandardGamepadButtonPressed(0, ebiten.StandardGamepadButtonCenterRight) ||
+		touched {
+		s.eHandler[EventCompleted]()
+		if s.audioplayer.IsPlaying() {
+			s.audioplayer.Close()
+		}
+	}
+
+	if !s.audioplayed {
+		s.audioplayer = audioContext.NewPlayerFromBytes(assets.Survive)
+		s.audioplayer.Play()
+		s.audioplayed = true
+	}
+
+	if !s.targetreached {
+		s.current.X += (s.target.X - s.current.X) / 8
+		s.current.Y += (s.target.Y - s.current.Y) / 8
+	} else {
+		s.current.Y += 0.5 * math.Sin(float64(s.cycle)/(math.Pi*8))
+	}
+
+	if math.Abs(s.current.Y-s.target.Y) < 1 && !s.targetreached {
+		s.targetreached = true
+	}
+
+	s.cycle++
+	return nil
+}
+
+func (s *StartScreen) Draw(screen *ebiten.Image) {
+	screen.Clear()
+	screen.DrawImage(assets.ImageBank[assets.Title], nil)
+	text.Draw(screen, "survive", fonts.SurviveFont.ArcadeLarge, int(s.current.X), int(s.current.Y), color.Black)
+
+	if s.targetreached && (s.cycle/16)%4 < 2 {
+		text.Draw(screen, "press start", fonts.SurviveFont.Arcade, 640/2-25, 300, color.Black)
+	}
+
+	text.Draw(screen, "©bsoft games", fonts.SurviveFont.ArcadeSmall, 640/2+25, 180, color.Black)
+
+}
+
+func (s *StartScreen) SetEventHandler(e ScreenManagerEvent, f func()) {
+	s.eHandler[e] = f
+}
+
+func (s *StartScreen) SetDimensions(a gamedata.Area) {
+	s.dimensions = a
+}

touch/touch.go

@@ -0,0 +1,51 @@
+package touch
+
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+	"golang.org/x/exp/maps"
+)
+
+var (
+	allTouchIDs          []ebiten.TouchID
+	currentTouchIDs      map[ebiten.TouchID]bool
+	justPressedTouchIDs  map[ebiten.TouchID]bool
+	justReleasedTouchIDs map[ebiten.TouchID]bool
+)
+
+func UpdateTouchIDs() {
+	newPressedTouchIDs := []ebiten.TouchID{}
+	newPressedTouchIDs = inpututil.AppendJustPressedTouchIDs(newPressedTouchIDs)
+	justPressedTouchIDs = map[ebiten.TouchID]bool{}
+	for i := 0; i < len(newPressedTouchIDs); i++ {
+		justPressedTouchIDs[newPressedTouchIDs[i]] = true
+		currentTouchIDs[newPressedTouchIDs[i]] = true
+	}
+	justReleasedTouchIDs = map[ebiten.TouchID]bool{}
+	allTouchIDs = maps.Keys(currentTouchIDs)
+	newReleasedTouchIDs := []ebiten.TouchID{}
+	newReleasedTouchIDs = inpututil.AppendJustReleasedTouchIDs(newReleasedTouchIDs)
+	for i := 0; i < len(newReleasedTouchIDs); i++ {
+		justReleasedTouchIDs[newReleasedTouchIDs[i]] = true
+		delete(currentTouchIDs, newReleasedTouchIDs[i])
+	}
+}
+
+func GetTouchIDs() []ebiten.TouchID {
+	return allTouchIDs
+}
+
+func IsTouchJustPressed(touchID ebiten.TouchID) bool {
+	return justPressedTouchIDs[touchID]
+}
+
+func IsTouchJustReleased(touchID ebiten.TouchID) bool {
+	return justReleasedTouchIDs[touchID]
+}
+
+func init() {
+	allTouchIDs = []ebiten.TouchID{}
+	currentTouchIDs = map[ebiten.TouchID]bool{}
+	justPressedTouchIDs = map[ebiten.TouchID]bool{}
+	justReleasedTouchIDs = map[ebiten.TouchID]bool{}
+}

weapons/gun.go

@@ -0,0 +1,26 @@
+package weapons
+
+import "mover/gamedata"
+
+type Gun struct {
+	active bool
+}
+
+func NewGun() *Gun {
+	g := &Gun{
+		active: false,
+	}
+	return g
+}
+
+func (g *Gun) IsActive() bool {
+	return g.active
+}
+
+func (g *Gun) SetActivity(active bool) {
+	g.active = active
+}
+
+func (g *Gun) GetWeaponType() gamedata.WeaponType {
+	return gamedata.WeaponTypeGun
+}

weapons/holster.go

@@ -0,0 +1,59 @@
+package weapons
+
+import "mover/gamedata"
+
+type Holster struct {
+	activewp gamedata.WeaponType
+	guns     map[gamedata.WeaponType]Weapon
+}
+
+func NewHolster() *Holster {
+	holster := &Holster{
+		guns:     make(map[gamedata.WeaponType]Weapon),
+		activewp: gamedata.WeaponTypeGun,
+	}
+	holster.AddWeapon(NewGun())
+	//holster.AddWeapon(NewLaser())
+	return holster
+}
+
+func (h *Holster) SetActiveWeapon(wt gamedata.WeaponType) {
+	_, ok := h.guns[wt]
+	if ok {
+		h.activewp = wt
+	}
+}
+
+func (h *Holster) GetActiveWeapon() Weapon {
+	return h.guns[h.activewp]
+}
+
+func (h *Holster) GetActiveWeaponType() gamedata.WeaponType {
+	return h.guns[h.activewp].GetWeaponType()
+}
+
+func (h *Holster) AddWeapon(w Weapon) {
+	_, ok := h.guns[w.GetWeaponType()]
+	if !ok {
+		h.guns[w.GetWeaponType()] = w
+	}
+}
+
+func (h *Holster) CycleWeapon() {
+	//no weapons, nothing to do
+	if len(h.guns) == 0 {
+		return
+	}
+
+	//keep searching until we find the next weapon that exists
+	var nextwp gamedata.WeaponType = h.activewp
+	for ok := false; !ok; {
+		nextwp = (nextwp + 1) % gamedata.WeaponTypeMax
+		_, ok = h.guns[nextwp]
+		if ok {
+			h.activewp = nextwp
+		}
+
+	}
+
+}

weapons/laser.go

@@ -0,0 +1,26 @@
+package weapons
+
+import "mover/gamedata"
+
+type Laser struct {
+	active bool
+}
+
+func NewLaser() *Laser {
+	l := &Laser{
+		active: false,
+	}
+	return l
+}
+
+func (g *Laser) IsActive() bool {
+	return g.active
+}
+
+func (g *Laser) SetActivity(active bool) {
+	g.active = active
+}
+
+func (g *Laser) GetWeaponType() gamedata.WeaponType {
+	return gamedata.WeaponTypeLaser
+}

weapons/weapon.go

@@ -0,0 +1,9 @@
+package weapons
+
+import "mover/gamedata"
+
+type Weapon interface {
+	IsActive() bool
+	SetActivity(bool)
+	GetWeaponType() gamedata.WeaponType
+}