chore: remove event listeners on shape destroy

packages/physics/circle.js

@@ -12,9 +12,7 @@ export class CircleShape extends decorate(Shape) {
 
   constructor() {
     super();
-    this.on('radiusChanged', () => {
-      this.emit('aabbChanged');
-    });
+    this.on('radiusChanged', this.onAabbChanged, this);
   }
 
   get aabb() {
@@ -28,6 +26,11 @@ export class CircleShape extends decorate(Shape) {
     ];
   }
 
+  destroy() {
+    super.destroy();
+    this.off('radiusChanged', this.onAabbChanged);
+  }
+
   fromJSON(json) {
     super.fromJSON(json);
     if (json.radius) {
@@ -36,6 +39,10 @@ export class CircleShape extends decorate(Shape) {
     return this;
   }
 
+  onAabbChanged() {
+    this.emit('aabbChanged');
+  }
+
   toJSON() {
     return {
       ...super.toJSON(),

packages/physics/list.js

@@ -8,29 +8,22 @@ export class ShapeList extends Shape {
   constructor() {
     super();
     this._shapes = [];
-    this.on('shapesChanged', () => {
-      this._shapes.forEach((shape) => {
-        shape.off('aabbChanged');
-        shape.on('aabbChanged', () => {
-          this.emit('aabbChanged');
-        });
-      });
-    });
-    this.on('originChanged', (oldOrigin) => {
-      this._shapes.forEach((shape) => {
-        shape.emit('parentOriginChanged', oldOrigin, this.origin);
-      });
-    });
-    this.on('rotationChanged', (oldRotation) => {
-      this._shapes.forEach((shape) => {
-        shape.emit('parentRotationChanged', oldRotation, this.rotation);
-      });
-    });
-    this.on('scaleChanged', (oldScale) => {
-      this._shapes.forEach((shape) => {
-        shape.emit('parentScaleChanged', oldScale, this.scale);
-      });
-    });
+    this.on('shapesChanged', this.onShapesChanged, this);
+    this.on('originChanged', this.onOriginChanged, this);
+    this.on('rotationChanged', this.onRotationChanged, this);
+    this.on('scaleChanged', this.onScaleChanged, this);
+  }
+
+  destroy() {
+    super.destroy();
+    this.off('shapesChanged', this.onShapesChanged);
+    this.off('originChanged', this.onOriginChanged);
+    this.off('rotationChanged', this.onRotationChanged);
+    this.off('scaleChanged', this.onScaleChanged);
+    for (let i = 0; i < this._shapes.length; i++) {
+      const shape = this._shapes[i];
+      shape.destroy();
+    }
   }
 
   *[Symbol.iterator]() {
@@ -58,6 +51,12 @@ export class ShapeList extends Shape {
     );
   }
 
+  addShape(shape) {
+    const oldShapes = [...this._shapes];
+    this._shapes.push(shape);
+    this.emit('shapesChanged', oldShapes, this._shapes);
+  }
+
   fromJSON(json) {
     super.fromJSON(json);
     if (json.shapes) {
@@ -65,17 +64,13 @@ export class ShapeList extends Shape {
       json.shapes.forEach((shape) => {
         shapes.push(shapeFromJSON(shape));
       });
+      const oldShapes = [...this._shapes];
       this._shapes = shapes;
-      this.emit('shapesChanged');
+      this.emit('shapesChanged', oldShapes, this._shapes);
     }
     return this;
   }
 
-  addShape(shape) {
-    this._shapes.push(shape);
-    this.emit('shapesChanged');
-  }
-
   intersects(list) {
     if (0 === this._shapes.length) {
       return false;
@@ -97,6 +92,37 @@ export class ShapeList extends Shape {
     return false;
   }
 
+  onChildAabbChanged() {
+    this.emit('aabbChanged');
+  }
+
+  onOriginChanged(oldOrigin) {
+    this._shapes.forEach((shape) => {
+      shape.emit('parentOriginChanged', oldOrigin, this.origin);
+    });
+  }
+
+  onRotationChanged(oldRotation) {
+    this._shapes.forEach((shape) => {
+      shape.emit('parentRotationChanged', oldRotation, this.rotation);
+    });
+  }
+
+  onScaleChanged(oldScale) {
+    this._shapes.forEach((shape) => {
+      shape.emit('parentScaleChanged', oldScale, this.scale);
+    });
+  }
+
+  onShapesChanged(oldShapes) {
+    oldShapes.forEach((shape) => {
+      shape.off('aabbChanged');
+    });
+    this._shapes.forEach((shape) => {
+      shape.on('aabbChanged', this.onChildAabbChanged, this);
+    });
+  }
+
   toJSON() {
     return {
       ...super.toJSON(),

packages/physics/polygon.js

@@ -16,18 +16,20 @@ export class PolygonShape extends Shape {
       'rotationChanged',
       'scaleChanged',
       'verticesChanged',
-    ], () => {
-      const parentOrigin = this.parent ? this.parent.origin : [0, 0];
-      const origin = Vector.add(this.origin, parentOrigin);
-      const parentRotation = this.parent ? this.parent.rotation : 0;
-      const rotation = this.rotation + parentRotation;
-      const parentScale = this.parent ? this.parent.scale : 1;
-      const scale = this.scale * parentScale;
-      this._translatedVertices = this._vertices.map((vertice) => {
-        return Vertice.translate(vertice, origin, rotation, scale);
-      });
-      this.emit('aabbChanged');
-    });
+    ], this.onRecalculateVertices, this);
+  }
+
+  destroy() {
+    super.destroy();
+    this.off([
+      'parentOriginChanged',
+      'parentRotationChanged',
+      'parentScaleChanged',
+      'originChanged',
+      'rotationChanged',
+      'scaleChanged',
+      'verticesChanged',
+    ], this.onRecalculateVertices);
   }
 
   *[Symbol.iterator]() {
@@ -62,6 +64,19 @@ export class PolygonShape extends Shape {
     return this;
   }
 
+  onRecalculateVertices() {
+    const parentOrigin = this.parent ? this.parent.origin : [0, 0];
+    const origin = Vector.add(this.origin, parentOrigin);
+    const parentRotation = this.parent ? this.parent.rotation : 0;
+    const rotation = this.rotation + parentRotation;
+    const parentScale = this.parent ? this.parent.scale : 1;
+    const scale = this.scale * parentScale;
+    this._translatedVertices = this._vertices.map((vertice) => {
+      return Vertice.translate(vertice, origin, rotation, scale);
+    });
+    this.emit('aabbChanged');
+  }
+
   get vertices() {
     return this._vertices;
   }

packages/physics/rectangle.js

@@ -14,18 +14,12 @@ export class RectangleShape extends decorate(PolygonShape) {
 
   constructor() {
     super();
-    this.on(['positionChanged', 'sizeChanged'], () => {
-      const halfSize = Vector.scale(this.size, 0.5);
-      const width = this.width - 0.001;
-      const height = this.height - 0.001;
-      const position = Vector.add(this.position, Vector.scale(halfSize, -1));
-      this.vertices = [
-        position,
-        Vector.add(position, [width, 0]),
-        Vector.add(position, [width, height]),
-        Vector.add(position, [0, height]),
-      ];
-    });
+    this.on(['positionChanged', 'sizeChanged'], this.onVerticesChanged, this);
+  }
+
+  destroy() {
+    super.destroy();
+    this.off(['positionChanged', 'sizeChanged'], this.onVerticesChanged);
   }
 
   fromJSON(json) {
@@ -41,6 +35,19 @@ export class RectangleShape extends decorate(PolygonShape) {
     return this;
   }
 
+  onVerticesChanged() {
+    const halfSize = Vector.scale(this.size, 0.5);
+    const width = this.width - 0.001;
+    const height = this.height - 0.001;
+    const position = Vector.add(this.position, Vector.scale(halfSize, -1));
+    this.vertices = [
+      position,
+      Vector.add(position, [width, 0]),
+      Vector.add(position, [width, height]),
+      Vector.add(position, [0, height]),
+    ];
+  }
+
   toJSON() {
     return {
       ...super.toJSON(),

packages/physics/shape-view.js

@@ -12,15 +12,11 @@ export class ShapeView extends Renderable {
     this.shape = shape;
     if (shape instanceof PolygonShape) {
       this.redrawPolygonLines();
-      shape.on('aabbChanged', () => {
-        this.redrawPolygonLines();
-      });
+      shape.on('aabbChanged', this.onPolygonShapeAabbChanged, this);
     }
     if (shape instanceof CircleShape) {
       this.redrawCircle();
-      shape.on('aabbChanged', () => {
-        this.redrawCircle();
-      });
+      shape.on('aabbChanged', this.onCircleShapeAabbChanged, this);
     }
     if (shape instanceof ShapeList) {
       for (const child of shape) {
@@ -29,15 +25,36 @@ export class ShapeView extends Renderable {
       }
     }
     this.container.position = shape.position;
-    shape.on('positionChanged', () => {
-      this.container.position = shape.position;
-    })
+    shape.on('positionChanged', this.onShapePositionChanged, this);
+  }
+
+  destroy() {
+    super.destroy();
+    if (shape instanceof PolygonShape) {
+      this.shape.off('aabbChanged', this.onPolygonShapeAabbChanged);
+    }
+    if (shape instanceof CircleShape) {
+      this.shape.off('aabbChanged', this.onCircleShapeAabbChanged);
+    }
+    this.shape.off('aabbChanged', this.onShapePositionChanged);
   }
 
   get internal() {
     return this.container.internal;
   }
 
+  onPolygonShapeAabbChanged() {
+    this.redrawPolygonLines();
+  }
+
+  onCircleShapeAabbChanged() {
+    this.redrawCircle();
+  }
+
+  onShapePositionChanged() {
+    this.container.position = shape.position;
+  }
+
   redrawCircle() {
     const primitives = new Primitives();
     primitives.drawCircle(

packages/physics/shape.js

@@ -30,15 +30,21 @@ export class Shape extends decorate(class {}) {
       'originChanged',
       'rotationChanged',
       'scaleChanged',
-    ], () => {
-      this.emit('aabbChanged');
-    });
+    ], this.onAabbChanged, this);
   }
 
   get aabb() {
     return [0, 0, 0, 0];
   }
 
+  destroy() {
+    this.off([
+      'originChanged',
+      'rotationChanged',
+      'scaleChanged',
+    ], this.onAabbChanged);
+  }
+
   fromJSON(json) {
     const keys = [
       'origin',
@@ -54,6 +60,10 @@ export class Shape extends decorate(class {}) {
     return this;
   }
 
+  onAabbChanged() {
+    this.emit('aabbChanged');
+  }
+
   toJSON() {
     return {
       origin: this.origin,

packages/physics/traits/shaped.trait.js

@@ -21,10 +21,11 @@ export class Shaped extends decorate(Trait) {
   }
 
   destroy() {
+    this._shape.destroy();
     if (this.shapeView) {
       this.shapeView.destroy();
+      this.shapeView = undefined;
     }
-    this.shapeView = undefined;
   }
 
   get shape() {