Added a rain layer for atmosphere.

assets/imagebank.go

@@ -27,6 +27,10 @@ const (
 	Worm          ImgAssetName = "WormDefault"
 	Cloud         ImgAssetName = "Cloud"
 	Fireball      ImgAssetName = "Fireball"
+	Splash        ImgAssetName = "Splash"
+	LaserBeam     ImgAssetName = "LaserBeam"
+	ItemLaser     ImgAssetName = "ItemLaser"
+	RainSplash    ImgAssetName = "RainSplash"
 )
 
 var (
@@ -60,6 +64,14 @@ var (
 	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() {
@@ -79,6 +91,10 @@ func LoadImages() {
 	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)
 
 }
 

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/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
+}

gamedata/gameinputs.go

@@ -9,4 +9,5 @@ type GameInputs struct {
 	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/canvas.go

@@ -2,6 +2,7 @@ package gameelement
 
 import (
 	"fmt"
+	"image"
 	"image/color"
 	"math"
 	"math/rand/v2"
@@ -9,6 +10,7 @@ import (
 	"mover/elements"
 	"mover/fonts"
 	"mover/gamedata"
+	"mover/weapons"
 
 	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/hajimehoshi/ebiten/v2/text"
@@ -19,6 +21,7 @@ type Canvas struct {
 	Sprite            *ebiten.Image
 	collisionMask     *ebiten.Image
 	projectileMask    *ebiten.Image
+	laserMask         *ebiten.Image
 	heroCollisionMask *ebiten.Image
 	heroCollisionCpy  *ebiten.Image
 
@@ -31,12 +34,18 @@ type Canvas struct {
 	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 {
@@ -44,10 +53,12 @@ func NewCanvas(a gamedata.Area) *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,
@@ -55,8 +66,11 @@ func NewCanvas(a gamedata.Area) *Canvas {
 		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
 }
 
@@ -69,11 +83,16 @@ func (c *Canvas) Update() error {
 		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++
 	}
 
@@ -83,14 +102,17 @@ func (c *Canvas) Update() error {
 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)
@@ -116,6 +138,14 @@ func (c *Canvas) Draw(drawimg *ebiten.Image) {
 		}
 	}
 
+	//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()
@@ -143,15 +173,32 @@ func (c *Canvas) Draw(drawimg *ebiten.Image) {
 		}
 	}
 
+	//draw projectiles
 	for _, p := range c.projectiles {
-		//drawimg.DrawImage()
 		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.
 	}
@@ -175,6 +222,8 @@ func (c *Canvas) Draw(drawimg *ebiten.Image) {
 func (c *Canvas) Initialize() {
 
 	c.InitializeHero()
+	c.CleanSplashes()
+	c.ResetWeaponDrops()
 	c.enemies = c.enemies[:0]
 	c.gameover = false
 	c.initialized = true
@@ -186,6 +235,9 @@ func (c *Canvas) Initialize() {
 
 	//temporary
 	c.hero.Action = elements.HeroActionDefault
+
+	c.holster.SetActiveWeapon(gamedata.WeaponTypeGun)
+	c.laser.SetFiring(false)
 }
 
 func (c *Canvas) UpdateHero() {
@@ -193,7 +245,6 @@ func (c *Canvas) UpdateHero() {
 	if !c.gameover {
 		c.UpdateHeroPosition()
 		c.ComputeHeroCollisions()
-		c.AddProjectiles()
 	}
 }
 
@@ -241,13 +292,16 @@ func (c *Canvas) ComputeHeroCollisions() {
 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 {
@@ -257,6 +311,7 @@ func (c *Canvas) AddProjectiles() {
 		if c.eventmap[gamedata.GameEventNewShot] != nil {
 			c.eventmap[gamedata.GameEventNewShot]()
 		}
+
 	}
 
 }
@@ -282,8 +337,8 @@ func (c *Canvas) UpdateProjectiles() {
 		}
 
 		for _, e := range c.enemies {
-			if p.Pos.X >= e.GetPosition().X-48/2 && p.Pos.X <= e.GetPosition().X+48/2 &&
-				p.Pos.Y >= e.GetPosition().Y-48/2 && p.Pos.Y <= e.GetPosition().Y+48/2 &&
+			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)
@@ -318,6 +373,32 @@ func (c *Canvas) UpdateProjectiles() {
 
 }
 
+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 {
@@ -467,8 +548,20 @@ 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 {
+		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++
 		}
@@ -513,3 +606,383 @@ func (c *Canvas) GoblinFireballEvent() {
 
 	}
 }
+
+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/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]
+
+}

screenmanager/manager.go

@@ -26,7 +26,7 @@ func NewManager() Manager {
 	return Manager{
 		Info: gamedata.GameInfo{
 			Name:    "survive",
-			Version: "0.30",
+			Version: "0.34",
 			Dimensions: gamedata.Area{
 				Width:  defaultWidth,
 				Height: defaultHeight,

screens/primary.go

@@ -50,6 +50,11 @@ func NewPrimary() *Primary {
 	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()
@@ -155,6 +160,7 @@ func (p *Primary) CollectInputs() gamedata.GameInputs {
 
 	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)

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
+}