ichigo/engine/sceneref.go

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2.4 KiB
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package engine
import (
"compress/gzip"
"encoding/gob"
"image"
"io/fs"
"github.com/hajimehoshi/ebiten/v2"
)
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// Ensure SceneRef satisfies interfaces.
var (
_ Loader = &SceneRef{}
_ Scener = &SceneRef{}
)
// SceneRef loads a gzipped, gob-encoded Scene from the asset FS.
// After Load, Scene is usable.
// This is mostly useful for scenes that refer to other scenes, e.g.
//
// var sc = &Scene{
// Components: []interface{}{
// SceneRef{Path: "assets/foo.gob.gz"}
// },
// }
type SceneRef struct {
Path string
scene *Scene // not exported for gob reasons
}
// Load loads the scene from the file.
func (r *SceneRef) Load(assets fs.FS) error {
f, err := assets.Open(r.Path)
if err != nil {
return err
}
defer f.Close()
gz, err := gzip.NewReader(f)
if err != nil {
return err
}
sc := new(Scene)
if err := gob.NewDecoder(gz).Decode(sc); err != nil {
return err
}
r.scene = sc
return nil
}
// The rest of the methods forward to r.scene, as such they will
// panic if the scene isn't loaded.
// BoundingRect returns the Bounds from the scene.
func (r SceneRef) BoundingRect() image.Rectangle { return r.scene.BoundingRect() }
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// IsDisabled returns the value of IsDisabled from the scene.
func (r SceneRef) IsDisabled() bool { return r.scene.IsDisabled() }
// Disable calls Disable on the scene.
func (r SceneRef) Disable() { r.scene.Disable() }
// Enable calls Enable on the scene.
func (r SceneRef) Enable() { r.scene.Enable() }
// Draw draws the scene.
func (r SceneRef) Draw(screen *ebiten.Image, opts ebiten.DrawImageOptions) {
r.scene.Draw(screen, opts)
}
// DrawOrder returns the value of DrawOrder from the scene.
func (r SceneRef) DrawOrder() float64 { return r.scene.DrawOrder() }
// IsHidden returns the value of IsHidden from the scene.
func (r SceneRef) IsHidden() bool { return r.scene.IsHidden() }
// Hide calls Hide on the scene.
func (r SceneRef) Hide() { r.scene.Hide() }
// Show calls Show on the scene.
func (r SceneRef) Show() { r.scene.Show() }
// Ident returns the value of Ident from the scene.
func (r SceneRef) Ident() string { return r.scene.Ident() }
// Prepare prepares the scene.
func (r SceneRef) Prepare(g *Game) { r.scene.Prepare(g) }
// Scan returns the components in the scene.
func (r SceneRef) Scan() []interface{} { return r.scene.Scan() }
// Update updates the scene.
func (r SceneRef) Update() error { return r.scene.Update() }