[nacltoons] Add initial frontend and physics game scenes.

nacltoons/src/PhysicsLayer.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+#ifndef PHYSICS_LAYER_H_
+#define PHYSICS_LAYER_H_
+
+#include "cocos2d.h"
+#include "Box2D/Box2D.h"
+
+USING_NS_CC;
+
+/**
+ * Physics layer that the user interacts with.
+ */
+class PhysicsLayer : public CCLayerColor {
+ public:
+  PhysicsLayer() {}
+  ~PhysicsLayer();
+  CREATE_FUNC(PhysicsLayer);
+  virtual bool init();
+  virtual void ccTouchesEnded(CCSet* touches, CCEvent* event);
+
+ private:
+  void AddNewSpriteAtPosition(CCPoint p);
+  void UpdateWorld(float dt);
+  bool InitPhysics();
+
+  CCTexture2D* sprite_texture_;
+  b2World* world_;
+};
+
+#endif // !PHYSICS_LAYER_H_