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

#ifndef _BOX2D_TEST_H_
#define _BOX2D_TEST_H_
#include "cocos2d.h"
#include "Box2D\Box2D.h"
USING_NS_CC;
class Box2dTest:public Node{
public:
    Box2dTest();
    ~Box2dTest();
    virtual bool init();
    void update(float) override;
    virtual void draw(Renderer *renderer, const Mat4& transform, uint32_t flags) override;
    CREATE_FUNC(Box2dTest);
private:
    b2World* _world;
};
#endif

Box2dTest.cpp

#include "Box2dTest.h"
#include "GLES-Render.h"

#define PTM_RATIO 32

Box2dTest::Box2dTest(){
    
}

Box2dTest::~Box2dTest(){
    CC_SAFE_DELETE(_world);
}

bool Box2dTest::init(){
    if (!Node::init())return false;
    _world = new b2World(b2Vec2(0.0f, 0.0f));

    //创建一个矩形刚体
    b2BodyDef boxDef;
    boxDef.position.Set(500/PTM_RATIO,350/PTM_RATIO);
    b2Body* box = _world->CreateBody(&boxDef);
    b2PolygonShape boxShape;
    boxShape.SetAsBox(40/PTM_RATIO, 40/PTM_RATIO);
    box->CreateFixture(&boxShape,1);
    
    //调试视图
    GLESDebugDraw* debugDraw = new GLESDebugDraw(PTM_RATIO);
    _world->SetDebugDraw(debugDraw);
    uint32 flags = 0;
    flags += b2Draw::e_shapeBit;
    flags += b2Draw::e_pairBit;
    flags += b2Draw::e_centerOfMassBit;
    debugDraw->SetFlags(flags);

    scheduleUpdate();
    return true;
}

void Box2dTest::update(float delta){
    _world->Step(30.0f, 10, 10);
}

void Box2dTest::draw(Renderer *renderer, const Mat4& transform, uint32_t flags){
    Node::draw(renderer, transform, flags);

    ccGLEnableVertexAttribs(kCCVertexAttribFlag_Position);
    kmGLPushMatrix();
    _world->DrawDebugData();
    kmGLPopMatrix();
    CHECK_GL_ERROR_DEBUG();
}

HelloWorld.cpp下的init()函数下添加：

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