105 lines
2.0 KiB
Go
105 lines
2.0 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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REWARD_HEIGHT = 32
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REWARD_WIDTH = 32
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SHINY_ANIMATION_CYCLES = 9
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SHINY_ROW_INDEX = 11
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SPARKLE_ROW_INDEX = 7
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)
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var (
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//go:embed resources/images/gold.png
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assetsReward_png []byte
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rewardsImage *ebiten.Image
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//go:embed resources/images/shiny.png
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assetsShiny_png []byte
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shinyImage *ebiten.Image
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)
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type Reward struct {
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Sprite *ebiten.Image
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scratch *ebiten.Image
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cycle int
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}
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func NewReward() *Reward {
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r := &Reward{
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cycle: 0,
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}
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r.Sprite = ebiten.NewImageFromImage(rewardsImage)
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r.scratch = ebiten.NewImageFromImage(rewardsImage)
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return r
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}
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func (r *Reward) Animate() {
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r.scratch.Clear()
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r.Sprite.Clear()
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r.scratch.DrawImage(rewardsImage.SubImage(image.Rect(0, 0, REWARD_WIDTH, REWARD_HEIGHT)).(*ebiten.Image), nil)
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if r.cycle < SHINY_ANIMATION_CYCLES {
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//add sheen
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op := &ebiten.DrawImageOptions{}
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op.Blend = ebiten.BlendSourceAtop
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sx := r.cycle * REWARD_WIDTH
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sy := REWARD_HEIGHT * SHINY_ROW_INDEX
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ex := sx + REWARD_WIDTH
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ey := sy + REWARD_HEIGHT
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r.scratch.DrawImage(shinyImage.SubImage(image.Rect(sx, sy, ex, ey)).(*ebiten.Image), op)
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//add sparkle
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spsy := REWARD_HEIGHT * SPARKLE_ROW_INDEX
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spey := spsy + REWARD_HEIGHT
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op.GeoM.Translate(REWARD_WIDTH/2, REWARD_HEIGHT/2)
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r.scratch.DrawImage(shinyImage.SubImage(image.Rect(sx, spsy, ex, spey)).(*ebiten.Image), nil)
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}
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r.Sprite.DrawImage(r.scratch, nil)
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r.CycleUpdate()
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}
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func (r *Reward) CycleUpdate() {
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r.cycle = (r.cycle + 1) % (SHINY_ANIMATION_CYCLES * 8)
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}
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func (r *Reward) Width() int {
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return REWARD_WIDTH
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}
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func (r *Reward) Height() int {
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return REWARD_HEIGHT
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}
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func init() {
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img, _, err := image.Decode(bytes.NewReader(assetsReward_png))
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if err != nil {
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log.Fatal(err)
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}
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rewardsImage = ebiten.NewImageFromImage(img)
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img, _, err = image.Decode(bytes.NewReader(assetsShiny_png))
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if err != nil {
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log.Fatal(err)
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}
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shinyImage = ebiten.NewImageFromImage(img)
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}
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