more wrappers around bool values

engine/fill.go

@@ -11,10 +11,10 @@ var _ Drawer = &Fill{}
 
 // Fill fills the screen with a colour.
 type Fill struct {
-	Color color.Color
-	ZOrder
-	Hidden bool
 	ID
+	Color color.Color
+	Hidden
+	ZOrder
 }
 
 func (f *Fill) Draw(screen *ebiten.Image, opts ebiten.DrawImageOptions) {

engine/image.go

@@ -23,6 +23,7 @@ func init() {
 // Image draws an image at a position.
 type Image struct {
 	ID
+	Hidden
 	Parallax
 	Pos image.Point
 	Src ImageRef
@@ -31,6 +32,9 @@ type Image struct {
 
 // Draw draws the image.
 func (i *Image) Draw(screen *ebiten.Image, opts ebiten.DrawImageOptions) {
+	if i.Hidden {
+		return
+	}
 	var geom ebiten.GeoM
 	geom.Translate(float64(i.Pos.X), float64(i.Pos.Y))
 	geom.Concat(opts.GeoM)

engine/interface.go

@@ -17,6 +17,13 @@ type Collider interface {
 	CollidesWith(image.Rectangle) bool
 }
 
+// Disabler components can be disabled.
+type Disabler interface {
+	IsDisabled() bool
+	Disable()
+	Enable()
+}
+
 // Drawer components can draw themselves. Draw is called often.
 // Each component is responsible for calling Draw on its child components
 // (so that hiding the parent can hide the children, etc).
@@ -88,6 +95,7 @@ type Scener interface {
 	// It seems cleaner to let the engine assert only for the interface it needs at that moment.
 
 	Bounder
+	Disabler
 	Drawer
 	DrawOrderer
 	Hider

engine/misc.go

@@ -14,6 +14,18 @@ type Bounds image.Rectangle
 // BoundingRect returns b as an image.Rectangle.
 func (b Bounds) BoundingRect() image.Rectangle { return image.Rectangle(b) }
 
+// Disabled implements Disabler directly (as a bool).
+type Disabled bool
+
+// IsHidden returns h as a bool.
+func (d Disabled) IsDisabled() bool { return bool(d) }
+
+// Hide sets h to true.
+func (d *Disabled) Disable() { *d = true }
+
+// Show sets h to false.
+func (d *Disabled) Enable() { *d = false }
+
 // Hidden implements Hider directly (as a bool).
 type Hidden bool
 

engine/scene.go

@@ -20,7 +20,7 @@ type Scene struct {
 	ID
 	Bounds     // world coordinates
 	Components []interface{}
-	Disabled   bool
+	Disabled
 	Hidden
 	ZOrder
 }

engine/sceneref.go

@@ -56,6 +56,15 @@ func (r *SceneRef) Load(assets fs.FS) error {
 // BoundingRect returns the Bounds from the scene.
 func (r SceneRef) BoundingRect() image.Rectangle { return r.scene.BoundingRect() }
 
+// 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)

engine/sprite.go

@@ -22,13 +22,13 @@ func init() {
 
 // Sprite combines an Actor with the ability to Draw from a single spritesheet.
 type Sprite struct {
+	ID
 	Actor
-	ZOrder
 	FrameSize   image.Point
 	FrameOffset image.Point
-	Hidden      bool
+	Hidden
-	ID
 	Src ImageRef
+	ZOrder
 
 	anim *Anim
 }

engine/tiles.go

@@ -27,14 +27,14 @@ func init() {
 // Tilemap renders a grid of tiles.
 type Tilemap struct {
 	ID
-	Disabled bool
+	Disabled
-	ZOrder
 	Hidden
 	Map      map[image.Point]Tile
 	Ersatz   bool        // "fake wall"
 	Offset   image.Point // world coordinates
 	Src      ImageRef
 	TileSize int
+	ZOrder
 }
 
 // CollidesWith implements Collider.