bubbles working yay!!!!!!!!! :)

engine/drawdag.go

@@ -65,7 +65,7 @@ func (d *DrawDAG) Draw(screen *ebiten.Image, opts *ebiten.DrawImageOptions) {
 		// Walk up game tree to find the nearest state in cache.
 		var st state
 		stack := []interface{}{x}
-		for p := d.game.Parent(x); ; p = d.game.Parent(p) {
+		for p := d.game.Parent(x); p != nil; p = d.game.Parent(p) {
 			if s, found := cache[p]; found {
 				st = s
 				break
@@ -236,6 +236,8 @@ func (d *DrawDAG) unregisterOne(x DrawBoxer) {
 	}
 	// Remove from reverse chunk map
 	delete(d.chunksRev, x)
+	// Remove from box cache
+	delete(d.boxCache, x)
 	// Remove from DAG
 	d.dag.removeVertex(x)
 }

engine/game.go

@@ -65,63 +65,29 @@ func (g *Game) Layout(outsideWidth, outsideHeight int) (w, h int) {
 
 // Update updates everything.
 func (g *Game) Update() error {
-	if g.Disabled() {
+	return g.updateRecursive(g)
+}
+
+// updateRecursive updates everything in a post-order traversal. It terminates recursion
+// early if the component reports it is Disabled.
+func (g *Game) updateRecursive(c interface{}) error {
+	if d, ok := c.(Disabler); ok && d.Disabled() {
 		return nil
 	}
-
+	if sc, ok := c.(Scanner); ok {
-	// Need to do a similar trick for Draw: disabling a parent object should
+		for _, x := range sc.Scan() {
-	// disable the child objects.
+			if err := g.updateRecursive(x); err != nil {
-	// cache memoises the disabled state for each component.
+				return err
-	cache := map[interface{}]bool{
+			}
-		g: false,
+		}
 	}
-
-	// Update everything that is not disabled.
-	return PostorderWalk(g, func(c, _ interface{}) error {
-		// Skip g (note g satisfies Updater, so this would infinitely recurse)
 	if c == g {
 		return nil
 	}
-		u, ok := c.(Updater)
+	if u, ok := c.(Updater); ok {
-		if !ok {
-			return nil
-		}
-
-		// Is u disabled itself?
-		if d, ok := u.(Disabler); ok && d.Disabled() {
-			cache[u] = true
-			return nil
-		}
-
-		// Walk up g.par to find the nearest state in accum.
-		var st bool
-		stack := []interface{}{u}
-		for p := g.par[u]; ; p = g.par[p] {
-			if s, found := cache[p]; found {
-				st = s
-				break
-			}
-			stack = append(stack, p)
-		}
-		// Unwind the stack, accumulating state along the way.
-		for len(stack) > 0 {
-			l1 := len(stack) - 1
-			p := stack[l1]
-			stack = stack[:l1]
-			if d, ok := p.(Disabler); ok {
-				st = st || d.Disabled()
-			}
-			cache[p] = st
-		}
-
-		// Skip updating if disabled.
-		if st {
-			return nil
-		}
-
-		// Update
 		return u.Update()
-	})
+	}
+	return nil
 }
 
 // Ident returns "__GAME__".
@@ -145,30 +111,31 @@ func (g *Game) Parent(c interface{}) interface{} {
 	return g.par[c]
 }
 
-// WalkUp visits the component, its parent, its parent, ..., and then g.
+func reverse(s []interface{}) {
-func (g *Game) WalkUp(component interface{}, visit func(interface{}) error) error {
+	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
-	for p := component; p != nil; p = g.Parent(p) {
+		s[i], s[j] = s[j], s[i]
-		if err := visit(p); err != nil {
-			return err
 	}
 }
-	return nil
-}
 
-// WalkDown visits g, the subcomponent of g, ..., and then the component.
+func (g *Game) Path(component interface{}) []interface{} {
-func (g *Game) WalkDown(component interface{}, visit func(interface{}) error) error {
 	var stack []interface{}
 	g.dbmu.RLock()
 	for p := component; p != nil; p = g.Parent(p) {
 		stack = append(stack, p)
 	}
 	g.dbmu.RUnlock()
-	for _, p := range stack {
+	reverse(stack)
-		if err := visit(p); err != nil {
+	return stack
-			return err
 }
+
+func (g *Game) ReversePath(component interface{}) []interface{} {
+	var stack []interface{}
+	g.dbmu.RLock()
+	for p := component; p != nil; p = g.Parent(p) {
+		stack = append(stack, p)
 	}
-	return nil
+	g.dbmu.RUnlock()
+	return stack
 }
 
 // Query looks for components having both a given ancestor and implementing

engine/misc.go

@@ -40,7 +40,7 @@ func (h *Hides) Hide() { *h = true }
 // Show sets h to false.
 func (h *Hides) Show() { *h = false }
 
-// Components implements Scan directly (as a slice of interface{}).
+// Components implements Scan directly (as itself!)
 type Components []interface{}
 
 // Scan returns c.

engine/scene.go

@@ -21,6 +21,7 @@ type scener interface {
 	Disabler
 	Hider
 	Identifier
+	Registrar
 	Scanner
 }
 
@@ -39,6 +40,21 @@ type Scene struct {
 	Hides
 }
 
+func (s *Scene) Register(component, parent interface{}) error {
+	if parent == s {
+		s.Components = append(s.Components, component)
+	}
+	return nil
+}
+
+func (s *Scene) Unregister(component interface{}) {
+	for i, c := range s.Components {
+		if c == component {
+			s.Components[i] = nil
+		}
+	}
+}
+
 // 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.

game/aw.go

@@ -125,16 +125,16 @@ func (aw *Awakeman) realUpdate() error {
 			}); err != nil {
 				return err
 			}
+			// Add bubble to same parent as aw
 			par := aw.game.Parent(aw)
-			if err := aw.game.WalkDown(par, func(c interface{}) error {
+			for _, c := range aw.game.Path(par) {
 				if r, ok := c.(engine.Registrar); ok {
-					return r.Register(bubble, par)
+					if err := r.Register(bubble, par); err != nil {
-				}
-				return nil
-			}); err != nil {
 						return err
 					}
-			if err := engine.PreorderWalk(bubble, func(c, _ interface{}) error {
+				}
+			}
+			if err := engine.PostorderWalk(bubble, func(c, _ interface{}) error {
 				if p, ok := c.(engine.Prepper); ok {
 					return p.Prepare(aw.game)
 				}

game/bubble.go

@@ -71,22 +71,24 @@ func (b *Bubble) Prepare(g *engine.Game) error {
 func (b *Bubble) Update() error {
 	b.Life--
 	if b.Life <= 0 {
-		if err := b.game.WalkUp(b, func(c interface{}) error {
+		for _, c := range b.game.ReversePath(b) {
-			b.game.Unregister(b)
+			if r, ok := c.(engine.Registrar); ok {
-			return nil
+				r.Unregister(b)
-		}); err != nil {
-			return err
 			}
 		}
-	if false { // not using MoveX/MoveY/... because collisions are unnecessary -
+	}
-		// this is an effect particle, if it overlaps a solid, who cares
+	if false {
+		// not using MoveX/MoveY/... because collisions are unnecessary -
+		// this is an effect particle; if it overlaps a solid, who cares
 		b.Sprite.Actor.Pos = b.Sprite.Actor.Pos.Add(geom.Pt3(
-			// --lint:ignore SA4000 one random minus another is not always zero...
+			//lint:ignore SA4000 one random minus another is not always zero...
-			rand.Intn(3)-1, rand.Intn(2)-1, 0, // rand.Intn(2)-rand.Intn(2),
+			rand.Intn(3)-1, rand.Intn(2)-1, rand.Intn(2)-rand.Intn(2),
 		))
 	} else {
 		b.Sprite.Actor.MoveX(float64(rand.Intn(3)-1), nil)
 		b.Sprite.Actor.MoveY(float64(rand.Intn(2)-1), nil)
+		//lint:ignore SA4000 one random minus another is not always zero...
+		b.Sprite.Actor.MoveZ(float64(rand.Intn(2)-rand.Intn(2)), nil)
 	}
 	return nil
 }