make billboard more complicated
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parent
146e713fd7
commit
0981350993
2 changed files with 48 additions and 8 deletions
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@ -2,7 +2,6 @@ package engine
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import (
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import (
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"encoding/gob"
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"encoding/gob"
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"image"
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"drjosh.dev/gurgle/geom"
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"drjosh.dev/gurgle/geom"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2"
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@ -10,6 +9,7 @@ import (
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// Ensure Billboard satisfies interfaces.
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// Ensure Billboard satisfies interfaces.
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var _ interface {
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var _ interface {
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BoundingBoxer
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Identifier
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Identifier
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Drawer
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Drawer
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Scanner
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Scanner
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@ -24,9 +24,19 @@ func init() {
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type Billboard struct {
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type Billboard struct {
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ID
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ID
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Hides
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Hides
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Pos image.Point
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Pos geom.Int3
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Src ImageRef
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Src ImageRef
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ZPosition
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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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}
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// Draw draws the image.
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// Draw draws the image.
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@ -34,10 +44,41 @@ func (b *Billboard) Draw(screen *ebiten.Image, opts *ebiten.DrawImageOptions) {
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screen.DrawImage(b.Src.Image(), opts)
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screen.DrawImage(b.Src.Image(), opts)
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}
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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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// Scan returns a slice containing Src.
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func (b *Billboard) Scan() []interface{} { return []interface{}{&b.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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func (b *Billboard) Transform() (opts ebiten.DrawImageOptions) {
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opts.GeoM.Translate(geom.CFloat(b.Pos))
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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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return opts
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}
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}
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@ -22,10 +22,9 @@ func Level1() *engine.Scene {
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&engine.Parallax{
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&engine.Parallax{
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CameraID: "game_camera",
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CameraID: "game_camera",
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Child: &engine.Billboard{
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Child: &engine.Billboard{
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ID: "bg_image",
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ID: "bg_image",
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ZPosition: -900,
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Pos: geom.Pt3(-160, -120, -1),
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Pos: image.Pt(-160, -120),
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Src: engine.ImageRef{Path: "assets/space.png"},
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Src: engine.ImageRef{Path: "assets/space.png"},
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},
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},
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Factor: 0.5,
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Factor: 0.5,
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},
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},
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