84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
package engine
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import (
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"encoding/gob"
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"drjosh.dev/gurgle/geom"
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"github.com/hajimehoshi/ebiten/v2"
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)
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// Ensure Billboard satisfies interfaces.
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var _ interface {
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BoundingBoxer
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Identifier
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Drawer
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Scanner
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Transformer
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} = &Billboard{}
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func init() {
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gob.Register(&Billboard{})
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}
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// Billboard draws an image at a position.
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type Billboard struct {
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ID
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Hides
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Pos geom.Int3
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Src ImageRef
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game *Game
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}
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// BoundingBox returns a 0-depth box incorporating the image size.
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func (b *Billboard) BoundingBox() geom.Box {
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sx, sy := b.Src.Image().Size()
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return geom.Box{
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Min: b.Pos,
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Max: b.Pos.Add(geom.Pt3(sx, sy, 0)),
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}
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}
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// Draw draws the image.
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func (b *Billboard) Draw(screen *ebiten.Image, opts *ebiten.DrawImageOptions) {
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screen.DrawImage(b.Src.Image(), opts)
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}
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// DrawAfter reports if b.Pos.Z >= x.Max.Z.
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func (b *Billboard) DrawAfter(x Drawer) bool {
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switch x := x.(type) {
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case BoundingBoxer:
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return b.Pos.Z >= x.BoundingBox().Max.Z
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case ZPositioner:
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return b.Pos.Z > x.ZPos()
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}
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return false
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}
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// DrawBefore reports if b.Pos.Z < x.Min.Z.
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func (b *Billboard) DrawBefore(x Drawer) bool {
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switch x := x.(type) {
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case BoundingBoxer:
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return b.Pos.Z < x.BoundingBox().Min.Z
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case ZPositioner:
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return b.Pos.Z < x.ZPos()
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}
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return false
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}
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// Prepare saves the reference to Game.
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func (b *Billboard) Prepare(g *Game) error {
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b.game = g
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return nil
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}
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// Scan returns a slice containing Src.
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func (b *Billboard) Scan() []interface{} { return []interface{}{&b.Src} }
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// Transform returns a translation by the projected position.
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func (b *Billboard) Transform() (opts ebiten.DrawImageOptions) {
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opts.GeoM.Translate(geom.CFloat(
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b.game.Projection.Project(b.Pos),
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))
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return opts
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}
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