70 lines
1.3 KiB
Go
70 lines
1.3 KiB
Go
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package main
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import (
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"bytes"
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_ "embed"
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"image"
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_ "image/png"
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"log"
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"github.com/hajimehoshi/ebiten/v2"
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)
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const (
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FLAME_ANIMATION_CYCLES = 8
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FLAME_WIDTH = 24
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FLAME_HEIGHT = 32
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)
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var (
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//go:embed resources/images/hot.png
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flameAssets_png []byte
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assetsFlame *ebiten.Image
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)
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type Flame struct {
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Sprite *ebiten.Image //our principle sprite representing the flame
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cycle int //current animation cycle for the character
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}
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func NewFlame() *Flame {
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return &Flame{
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cycle: 0,
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Sprite: ebiten.NewImage(FLAME_WIDTH, FLAME_HEIGHT),
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}
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}
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func (f *Flame) CycleUpdate() {
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f.cycle = (f.cycle + 1) % CHARACTER_ANIMATION_CYCLES
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}
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func (f *Flame) Animate() {
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//compute start and end location of asset to use for animation frame cycle
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sx := FLAME_WIDTH * f.cycle
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sy := 0
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ex := FLAME_WIDTH * (f.cycle + 1)
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ey := FLAME_HEIGHT
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f.Sprite.Clear()
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f.Sprite.DrawImage(assetsFlame.SubImage(image.Rect(sx, sy, ex, ey)).(*ebiten.Image), nil)
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f.CycleUpdate()
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}
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func (f *Flame) GetWidth() int {
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return f.Sprite.Bounds().Dx()
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}
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func (f *Flame) GetHeight() int {
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return f.Sprite.Bounds().Dy()
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}
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func init() {
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img, _, err := image.Decode(bytes.NewReader(flameAssets_png))
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if err != nil {
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log.Fatal(err)
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}
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assetsFlame = ebiten.NewImageFromImage(img)
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}
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