新增相机bounds与可渲染组件bounds 并添加可渲染组件的剔除方法

source/src/ECS/Components/RenderableComponent.ts

@@ -2,5 +2,48 @@
  * 所有可渲染组件的基类 
  */
 abstract class RenderableComponent extends Component {
-    
+    private _isVisible: boolean;
+    private _areBoundsDirty = true;
+    private _bounds: Rectangle;
+    private _localOffset: Vector2;
+
+    public get width(){
+        return this.bounds.width;
+    }
+
+    public get height(){
+        return this.bounds.height;
+    }
+
+    public get isVisible(){
+        return this._isVisible;
+    }
+
+    public set isVisible(value: boolean){
+        this._isVisible = value;
+
+        if (this._isVisible)
+            this.onBecameVisible();
+        else
+            this.onBecameInvisible();
+    }
+
+    public get bounds(): Rectangle{
+        if (this._areBoundsDirty){
+            this._bounds.calculateBounds(this.entity.transform.position, this._localOffset, Vector2.Zero,
+                this.entity.transform.scale, this.entity.transform.rotation, this.width, this.height);
+            this._areBoundsDirty = false;
+        }
+
+        return this._bounds;
+    }
+
+    protected onBecameVisible(){}
+
+    protected onBecameInvisible(){}
+
+    public isVisibleFromCamera(camera: Camera): boolean{
+        this.isVisible = camera.bounds.intersects(this.bounds);
+        return this.isVisible;
+    }
 }