Performance optimizations and refacturing.

js/Camera.js

@@ -1,4 +1,5 @@
 import GeometryPoint from "./geometry/GeometryPoint.js";
+import GeometryRect from "./geometry/GeometryRect.js";
 
 export default class Camera
 {
@@ -114,4 +115,20 @@ export default class Camera
             }
         }
     }
+
+    getViewAsRect()
+    {
+        return new GeometryRect(this.position.x, this.position.y, this.width, this.height);
+    }
+
+    isMovableInsideView(movable)
+    {
+        let viewRect = this.getViewAsRect();
+        let distanceMovable = movable.getRect().getDiagonal().getLength() * 0.5;
+        let distanceCamera = viewRect.getDiagonal().getLength() * 0.5;
+
+        let distanceMin = distanceMovable + distanceCamera;
+
+        return movable.getCenter().getDistanceToPoint(viewRect.getCenter()) < distanceMin;
+    }
 }