[nacltoons] Use box2d sensors to detect collisions.

nacltoons/src/physics_layer.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"
 
 #ifdef COCOS2D_DEBUG
 #include "GLES-Render.h"
 #endif
 
 USING_NS_CC;
 
 typedef std::vector<cocos2d::CCPoint> PointList;
 
 /**
  * Physics layer that the user interacts with.
  */
-class PhysicsLayer : public CCLayerColor {
+class PhysicsLayer : public CCLayerColor, b2ContactListener {

[binji, 2013/03/04 19:31:13]

public b2ContactListener

[Sam Clegg, 2013/03/04 20:08:18]

Done.

  public:
   PhysicsLayer();
   ~PhysicsLayer();
 
   // Add static create() method which encapsulates new + init
   CREATE_FUNC(PhysicsLayer);
 
   virtual bool init();
   virtual void draw();
   virtual bool ccTouchBegan(CCTouch* touch, CCEvent* event);
   virtual void ccTouchMoved(CCTouch* touch, CCEvent* event);
   virtual void ccTouchEnded(CCTouch* touch, CCEvent* event);
   virtual void registerWithTouchDispatcher();
 
   b2World* GetWorld() { return box2d_world_; }
 
   // Add the current (most recently created) instance.
   // Unfortunately this is needed by the lua bindings so the it can access the
   // GetWorld method.
   // TODO(sbc): find a way to do without this.
   static PhysicsLayer* GetCurrent() { return current_instance_; }
 
 #ifdef COCOS2D_DEBUG
   void ToggleDebug();
 #endif
 
+  // Called by box2d when contact occurs
+  void BeginContact(b2Contact* contact);
  private:
   // Called by ccTouchesMoved to draw between two points
   void DrawLine(CCPoint& start, CCPoint& end);
   // Called by ccTouchesBegan to draw a single point.
   void DrawPoint(CCPoint& location);
   // Clamp brush location to within the visible area
   void ClampBrushLocation(CCPoint& point);
 
   void AddLineToBody(b2Body *body, CCPoint start, CCPoint end);
   void AddSphereToBody(b2Body *body, CCPoint* location);
@@ skipping 41 matching lines @@
 
 #ifdef COCOS2D_DEBUG
   // Debug drawing support for Box2D.
   GLESDebugDraw* box2d_debug_draw_;
   // Flag to enable drawing of Box2D debug data.
   bool debug_enabled_;
 #endif
 };
 
 #endif  // PHYSICS_LAYER_H_