cocos2d-x 3.10 显示Box2d 调试视图

1.将cocos2d-x-3.10\tests\cpp-tests\Classes\Box2DTestBed目录下的GLES-Render.h和GLES-Render.cpp拷贝到当前项目的Classes目录下。

2.在visual studio2013打开当前项目解决方案，在解决方案资源管理器的src下右键->添加->现有项，选择刚才拷贝到Classes目录下GLES-Render.h和GLES-Render.cpp。

Box2dTest.h

 1 #ifndef _BOX2D_TEST_H_
 2 #define _BOX2D_TEST_H_
 3 #include "cocos2d.h"
 4 #include "Box2D\Box2D.h"
 5 USING_NS_CC;
 6 class Box2dTest:public Node{
 7 public:
 8     Box2dTest();
 9     ~Box2dTest();
10     virtual bool init();
11     void update(float) override;
12     virtual void draw(Renderer *renderer, const Mat4& transform, uint32_t flags) override;
13     CREATE_FUNC(Box2dTest);
14 private:
15     b2World* _world;
16 };
17 #endif

Box2dTest.cpp

 1 #include "Box2dTest.h"
 2 #include "GLES-Render.h"
 3 
 4 #define PTM_RATIO 32
 5 
 6 Box2dTest::Box2dTest(){
 7     
 8 }
 9 
10 Box2dTest::~Box2dTest(){
11     CC_SAFE_DELETE(_world);
12 }
13 
14 bool Box2dTest::init(){
15     if (!Node::init())return false;
16     _world = new b2World(b2Vec2(0.0f, 0.0f));
17 
18     //创建一个矩形刚体
19     b2BodyDef boxDef;
20     boxDef.position.Set(500/PTM_RATIO,350/PTM_RATIO);
21     b2Body* box = _world->CreateBody(&boxDef);
22     b2PolygonShape boxShape;
23     boxShape.SetAsBox(40/PTM_RATIO, 40/PTM_RATIO);
24     box->CreateFixture(&boxShape,1);
25     
26     //调试视图
27     GLESDebugDraw* debugDraw = new GLESDebugDraw(PTM_RATIO);
28     _world->SetDebugDraw(debugDraw);
29     uint32 flags = 0;
30     flags += b2Draw::e_shapeBit;
31     flags += b2Draw::e_pairBit;
32     flags += b2Draw::e_centerOfMassBit;
33     debugDraw->SetFlags(flags);
34 
35     scheduleUpdate();
36     return true;
37 }
38 
39 void Box2dTest::update(float delta){
40     _world->Step(30.0f, 10, 10);
41 }
42 
43 void Box2dTest::draw(Renderer *renderer, const Mat4& transform, uint32_t flags){
44     Node::draw(renderer, transform, flags);
45 
46     ccGLEnableVertexAttribs(kCCVertexAttribFlag_Position);
47     kmGLPushMatrix();
48     _world->DrawDebugData();
49     kmGLPopMatrix();
50     CHECK_GL_ERROR_DEBUG();
51 }

HelloWorld.cpp下的init()函数下添加：

1 Box2dTest* box2dTest=Box2dTest::create();
2 addChild(box2dTest);