68 lines
1.2 KiB
Go
68 lines
1.2 KiB
Go
package engine
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import (
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"encoding/gob"
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"image"
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"github.com/hajimehoshi/ebiten/v2"
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)
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// Ensure Sprite satisfies interfaces.
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var (
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_ Identifier = &Sprite{}
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_ Drawer = &Sprite{}
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_ DrawOrderer = &Sprite{}
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_ Scanner = &Sprite{}
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_ Updater = &Sprite{}
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)
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func init() {
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gob.Register(&Sprite{})
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}
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// Sprite combines an Actor with the ability to Draw from a single spritesheet.
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type Sprite struct {
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ID
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Actor
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FrameSize image.Point
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FrameOffset image.Point
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Hidden
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Src ImageRef
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ZOrder
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anim *Anim
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}
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func (s *Sprite) Draw(screen *ebiten.Image, opts ebiten.DrawImageOptions) {
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if s.Hidden {
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return
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}
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dp := s.Pos.Add(s.FrameOffset)
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var geom ebiten.GeoM
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geom.Translate(float64(dp.X), float64(dp.Y))
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geom.Concat(opts.GeoM)
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opts.GeoM = geom
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frame := s.anim.CurrentFrame()
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src := s.Src.Image()
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w, _ := src.Size()
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sp := image.Pt((frame*s.FrameSize.X)%w, ((frame*s.FrameSize.X)/w)*s.FrameSize.Y)
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screen.DrawImage(src.SubImage(image.Rectangle{sp, sp.Add(s.FrameSize)}).(*ebiten.Image), &opts)
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}
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func (s *Sprite) Scan() []interface{} {
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return []interface{}{
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&s.Actor,
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&s.Src,
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}
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}
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func (s *Sprite) SetAnim(a *Anim) {
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if s.anim != a {
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a.Reset()
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}
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s.anim = a
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}
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func (s *Sprite) Update() error { return s.anim.Update() }
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