cocos2d-x之box2d使用笔记

简介:

 下午学了一下box2d相关的内容,这里做个笔记。

1、创建头文件

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#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__
#include "cocos2d.h"
#include "GLES-Render.h"
USING_NS_CC;
class  HelloWorld :  public  cocos2d::CCLayer
{
public :
    HelloWorld();
    ~HelloWorld();
                      
     static  cocos2d::CCScene* scene();
     CCSize _screenSize;
     void  initPhysics();
     virtual  void  draw();
     void  update( float  dt);
     virtual  void  ccTouchesEnded(CCSet *pTouches, CCEvent *pEvent);
     void  addNewSpriteAtPosition(CCPoint p);
private :
     cocos2d::CCTexture2D* m_pSpriteTexture;
     b2World* world;
     GLESDebugDraw* m_debugDraw;
};
#endif // __HELLOWORLD_SCENE_H__


2、编写实现cpp

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#include "HelloWorldScene.h"
#include "VisibleRect.h"
USING_NS_CC;
#define PTM_RATIO 32.0f
enum {
     kTagParentNode = 1
};
HelloWorld::HelloWorld():m_pSpriteTexture(NULL),world(NULL){
     _screenSize = CCDirector::sharedDirector()->getVisibleSize();
     setTouchEnabled( true );
     this ->initPhysics();
     //使用批处理方式加载图片
     CCSpriteBatchNode *parent = CCSpriteBatchNode::create( "blocks.png" ,100);
     m_pSpriteTexture = parent->getTexture();
     addChild(parent,0,kTagParentNode);
     //在中间添加一个精灵
     addNewSpriteAtPosition(ccp(_screenSize.width/2,_screenSize.height/2));
     scheduleUpdate();
}
HelloWorld::~HelloWorld(){
     delete  world;
     world = NULL;
     delete  m_debugDraw;
}
void  HelloWorld::initPhysics(){
     b2Vec2 gravity;
     gravity.Set(0.0f,-10.0f);
     //创建世界
     world =  new  b2World(gravity);
     //允许睡眠
     world->SetAllowSleeping( true );
     world->SetContinuousPhysics( true );
     //创建GLESDebugDraw
      m_debugDraw =  new  GLESDebugDraw( PTM_RATIO );
      world->SetDebugDraw(m_debugDraw);
     uint32 flags = 0;
     flags += b2Draw::e_shapeBit;
     flags += b2Draw::e_jointBit;
      m_debugDraw->SetFlags(flags);
     //定义边框
     b2BodyDef groundBodyDef;
     groundBodyDef.position.Set(0,0);
     b2Body* groundBody = world->CreateBody(&groundBodyDef);
     //定义ground box shape
     b2EdgeShape groundBox;
     //bottom
     groundBox.Set(b2Vec2(0,0),
         b2Vec2(_screenSize.width/PTM_RATIO,0/PTM_RATIO));
     groundBody->CreateFixture(&groundBox,0);
     //top
     groundBox.Set(b2Vec2(0,_screenSize.height/PTM_RATIO),
         b2Vec2(_screenSize.width/PTM_RATIO,_screenSize.height/PTM_RATIO));
     groundBody->CreateFixture(&groundBox,0);
     //left
     groundBox.Set(b2Vec2(0,_screenSize.height/PTM_RATIO),
         b2Vec2(0,0));
     groundBody->CreateFixture(&groundBox,0);
     //right
     groundBox.Set(b2Vec2(_screenSize.width/PTM_RATIO,_screenSize.height/PTM_RATIO),
         b2Vec2(_screenSize.width/PTM_RATIO,0));
     groundBody->CreateFixture(&groundBox,0);
}
void  HelloWorld::draw(){
     CCLayer::draw();
          
     glDisable(GL_TEXTURE_2D);
     glDisableClientState(GL_COLOR_ARRAY);
     glDisableClientState(GL_TEXTURE_COORD_ARRAY);
      //进行绘制
      world->DrawDebugData();
     // restore default GL states
     glEnable(GL_TEXTURE_2D);
     glEnableClientState(GL_COLOR_ARRAY);
     glEnableClientState(GL_TEXTURE_COORD_ARRAY);  
}
void  HelloWorld::update( float  dt){
     world->Step(dt,8,1);
     //同步精灵的物理动作
     for (b2Body* b = world->GetBodyList();b;b=b->GetNext()){
         if (b->GetUserData()!=NULL){
             CCSprite* sprite = (CCSprite*)b->GetUserData();
             sprite->setPosition(ccp(b->GetPosition().x * PTM_RATIO,b->GetPosition().y*PTM_RATIO));
             sprite->setRotation(-1*CC_RADIANS_TO_DEGREES(b->GetAngle()));
         }
     }
}
CCScene* HelloWorld::scene()
{
     // 'scene' is an autorelease object
     CCScene *scene = CCScene::create();
             
     // 'layer' is an autorelease object
     HelloWorld *layer =  new  HelloWorld();
     // add layer as a child to scene
     scene->addChild(layer);
     layer->release();
     // return the scene
     return  scene;
}
/************************************************************************/
/* 触摸方法                                                                     */
/************************************************************************/
void  HelloWorld::ccTouchesEnded(CCSet *pTouches, CCEvent *pEvent){
     CCSetIterator it;
     CCTouch* touch;
     for (it = pTouches->begin();it!=pTouches->end();it++){
         touch = (CCTouch*)(*it);
         if (!touch){
             break ;
         }
         CCPoint location = touch->getLocation();
         //触摸后添加精灵
         addNewSpriteAtPosition(location);
     }
}
/************************************************************************/
/* 添加精灵                                                                     */
/************************************************************************/
void  HelloWorld::addNewSpriteAtPosition(CCPoint p){
     CCLOG( "Add sprite %0.2f x %02.f" ,p.x,p.y);
     CCNode* parent =  this ->getChildByTag(kTagParentNode);
     int  idx=(CCRANDOM_0_1()>0.5f?0:1);
     int  idy=(CCRANDOM_0_1()>0.5f?0:1);
     //随机创建精灵
     CCSprite* sprite = CCSprite::createWithTexture(m_pSpriteTexture,CCRectMake(32*idx,32*idy,32,32));
     sprite->setPosition(p);
     parent->addChild(sprite);
     //定义动态刚体
     b2BodyDef bodyDef;
     bodyDef.type = b2_dynamicBody;
     bodyDef.position.Set(p.x/PTM_RATIO,p.y/PTM_RATIO);
     bodyDef.userData = sprite;
     //创建刚体
     b2Body* body = world->CreateBody(&bodyDef);
     //创建长方形
     b2PolygonShape dynamicBox;
     dynamicBox.SetAsBox(sprite->getContentSize().width/PTM_RATIO/2,sprite->getContentSize().width/PTM_RATIO/2);
     //定义夹角
     b2FixtureDef fixtureDef;
     fixtureDef.shape = &dynamicBox;
     fixtureDef.density = 1.0f;  //密度
     fixtureDef.friction = 0.3f; //摩擦力
     body->CreateFixture(&fixtureDef);
          
}

素材来源与cocos2d-x自带demo

wKioL1MDKoTThQaHAABnByiZG-g802.jpg


本文转自xuzw13 51CTO博客,原文链接:http://blog.51cto.com/xuzhiwei/1360206,如需转载请自行联系原作者

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