Minor tweaks to flygoblin.

elements/enemies.go

@@ -22,4 +22,5 @@ type Enemies interface {
 	IsTouched() bool
 	ExplosionInitiated() bool
 	SetExplosionInitiated()
+	Health() int
 }

elements/flyeye.go

@@ -161,3 +161,7 @@ func (f *FlyEye) ExplosionInitiated() bool {
 func (f *FlyEye) SetExplosionInitiated() {
 	f.sploding = true
 }
+
+func (f *FlyEye) Health() int {
+	return 0
+}

elements/flygoblin.go

@@ -0,0 +1,178 @@
+package elements
+
+import (
+	"image"
+	"image/color"
+	"mover/assets"
+	"mover/gamedata"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+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
+	dyingcount     int
+	damageduration int
+	right          bool
+	hit            bool
+	touched        bool
+	toggle         bool
+	sploding       bool
+	damage         bool
+}
+
+func NewFlyGoblin() *FlyGoblin {
+	fg := &FlyGoblin{
+		Sprite:         ebiten.NewImage(96, 96),
+		Maks:           ebiten.NewImage(96, 96),
+		MaksDest:       ebiten.NewImage(96, 96),
+		health:         100,
+		damageduration: 0,
+	}
+	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
+
+	}
+
+	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
+}

gameelement/canvas.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"image/color"
 	"math"
-	"math/rand/v2"
 	"mover/assets"
 	"mover/elements"
 	"mover/fonts"
@@ -25,6 +24,7 @@ type Canvas struct {
 	eventmap map[gamedata.GameEvent]func()
 
 	initialized   bool
+	goblinspawned bool
 	lastInputs    gamedata.GameInputs
 	runtime       float64
 	counter       int
@@ -41,12 +41,13 @@ 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),
-		heroCollisionMask: ebiten.NewImage(46, 46),
-		heroCollisionCpy:  ebiten.NewImage(46, 46),
+		heroCollisionMask: ebiten.NewImage(48, 48),
+		heroCollisionCpy:  ebiten.NewImage(48, 48),
 		hero:              elements.NewHero(),
 		charge:            elements.NewExplosion(),
 		initialized:       false,
 		gameover:          false,
+		goblinspawned:     false,
 		score:             0,
 		runtime:           0.,
 	}
@@ -97,8 +98,16 @@ func (c *Canvas) Draw(drawimg *ebiten.Image) {
 	for _, e := range c.enemies {
 		e.Draw()
 		op := &ebiten.DrawImageOptions{}
-		op.GeoM.Translate(e.GetPosition().X-46/2, e.GetPosition().Y-46/2)
+		op.GeoM.Translate(e.GetPosition().X-float64(e.GetSprite().Bounds().Dx())/2, e.GetPosition().Y-float64(e.GetSprite().Bounds().Dy())/2)
 		c.Sprite.DrawImage(e.GetSprite(), op)
+
+		//do we need a health bar for this enemy?
+		if e.Health() > 0 {
+			x0 := e.GetPosition().X - float64(e.GetSprite().Bounds().Dx())
+			y0 := e.GetPosition().Y - 2/3.*float64(e.GetSprite().Bounds().Dy())
+			vector.DrawFilledRect(c.Sprite, float32(x0), float32(y0), 204, 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)
+		}
 	}
 
 	for _, p := range c.projectiles {
@@ -140,6 +149,7 @@ func (c *Canvas) Initialize() {
 	c.score = 0
 	c.counter = 0
 	c.runtime = 0.
+	c.goblinspawned = false
 
 	//temporary
 	c.hero.Action = elements.HeroActionDefault
@@ -168,8 +178,8 @@ func (c *Canvas) UpdateHeroPosition() {
 func (c *Canvas) ComputeHeroCollisions() {
 	for _, e := range c.enemies {
 		//compute collision with hero
-		if c.hero.Pos.X >= e.GetPosition().X-46/2 && c.hero.Pos.X <= e.GetPosition().X+46/2 &&
-			c.hero.Pos.Y >= e.GetPosition().Y-46/2 && c.hero.Pos.Y <= e.GetPosition().Y+46/2 &&
+		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 {
@@ -183,7 +193,7 @@ func (c *Canvas) ComputeHeroCollisions() {
 			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, 46*46*4) {
+			if c.HasCollided(c.heroCollisionMask, 48*48*4) {
 				c.hero.SetHit()
 				c.gameover = true
 
@@ -341,6 +351,7 @@ func (c *Canvas) UpdateEnemies() {
 		e.Update()
 	}
 	if !c.gameover {
+		/*
 			//spawn new enemies
 			f := 40000 / (c.counter + 1)
 
@@ -365,6 +376,12 @@ func (c *Canvas) UpdateEnemies() {
 				newenemy.SetTarget(c.hero.Pos)
 
 				c.enemies = append(c.enemies, newenemy)
+			}*/
+
+		if !c.goblinspawned {
+			newfg := elements.NewFlyGoblin()
+			c.enemies = append(c.enemies, newfg)
+			c.goblinspawned = true
 		}
 	}
 }