【麦可网】Cocos2d-X跨平台游戏开发学习笔记---第二十五课：Cocos2D-X物理引擎之Box2D8-10

概述【麦可网】Cocos2d-X跨平台游戏开发---学习笔记 第二十五课：Cocos2D-X物理引擎之Box2D8-10 =============================================================================================================================================

【麦可网】Cocos2d-X跨平台游戏开发---学习笔记

第二十五课：Cocos2D-X物理引擎之Box2D8-10

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课程目标：

-学习Box2D

课程重点：

-Box2D概念

-Box2D常用 *** 作

-使用物理编辑器

考核目标：

-能够使用Box2D常用 *** 作

-使用物理编辑器完成物理对象编辑

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一、物理编辑器

1.vertexHelper（mac）

2.PhysicsEditor

二、使用PhysicsEditor的实例

HelloPhysicEditor.h-------------------------------------#pragma once#include "cocos2d.h"#include "Box2D/Box2D.h"USING_NS_CC;class HelloPhysicEditor : public cocos2d::cclayer{private:	CCTexture2D* m_pSpriteTexture;	b2World* world;public:	HelloPhysicEditor();	~HelloPhysicEditor();	// Here's a difference. Method 'init' in cocos2d-x returns bool,instead of returning 'ID' in cocos2d-iphone	virtual bool init();  	// there's no 'ID' in cpp,so we recommend returning the class instance pointer	static cocos2d::CCScene* scene();	// a selector callback	voID menuCloseCallback(CCObject* pSender);	// implement the "static node()" method manually	CREATE_FUNC(HelloPhysicEditor);	virtual voID cctouchesEnded(CCSet *ptouches,CCEvent *pEvent);	voID initPhysics();	voID addNewSpriteAtposition(CCPoint p);	voID updata(float dt);};HelloPhysicEditor.cpp-------------------------------------#include "HelloPhysicEditor.h"#include "cocos-ext.h"#include "GB2ShapeCache-x.h"using namespace cocos2d::extension;USING_NS_CC;enum{	kTagparentNode = 1,};#define PTM_RATIO 32.0fstring names[] = {	"hotdog","drink","icecream","icecream2","icecream3","hamburger","orange"};CCScene* HelloPhysicEditor::scene(){	// 'scene' is an autorelease object	CCScene *scene = CCScene::create();	// 'layer' is an autorelease object	HelloPhysicEditor *layer = HelloPhysicEditor::create();	// add layer as a child to scene	scene->addChild(layer);	// return the scene	return scene;}HelloPhysicEditor::HelloPhysicEditor():m_pSpriteTexture(NulL),world(NulL){//加载physicsEditor生成的文件	GB2ShapeCache::sharedGB2ShapeCache()->addShapesWithfile("physic_all.pList");}HelloPhysicEditor::~HelloPhysicEditor(){	CC_SAFE_DELETE(world);}// on "init" you need to initialize your instancebool HelloPhysicEditor::init(){	//////////////////////////////	// 1. super init first	if ( !cclayer::init() )	{		return false;	}	settouchEnabled(true);	setAccelerometerEnabled(true);	this->initPhysics();	CCSpriteBatchNode* blocks = CCSpriteBatchNode::create("blocks.png",100);	m_pSpriteTexture = blocks->getTexture();	addChild(blocks,kTagparentNode);	//scheduleUpdate();	this->schedule(schedule_selector(HelloPhysicEditor::updata));	return true;}voID HelloPhysicEditor::menuCloseCallback(CCObject* pSender){}voID HelloPhysicEditor::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();		addNewSpriteAtposition( location );	}}voID HelloPhysicEditor::initPhysics(){	b2Vec2 gravity; 	gravity.Set(0.0f,-10.0f);	world = new b2World(gravity);	world->SetAllowSleePing(true);	world->SetContinuousPhysics(true);	//创建物理空间的范围	b2BodyDef groundBodyDef;	groundBodyDef.position.Set(0,0);	//创建刚体	b2Body* groundBody = world->CreateBody(&groundBodyDef);	//创建形状	b2EdgeShape groundBox;	//创建夹具	//将形状绑定到刚体上	//button	groundBox.Set(b2Vec2(0,0),b2Vec2(480/PTM_RATIO,0));	groundBody->CreateFixture(&groundBox,0);	//top	groundBox.Set(b2Vec2(0,320/PTM_RATIO),320/PTM_RATIO));	groundBody->CreateFixture(&groundBox,0);	//left	groundBox.Set(b2Vec2(0,b2Vec2(0,0);	//right	groundBox.Set(b2Vec2(480/PTM_RATIO,0);}voID HelloPhysicEditor::addNewSpriteAtposition(CCPoint p){	string name = names[rand()%7];	//定义刚体	b2BodyDef bodyDef;	bodyDef.type = b2_dynamicBody;	bodyDef.position.Set(p.x/PTM_RATIO,p.y/PTM_RATIO);	b2Body *body = world->CreateBody(&bodyDef);	//定义多边形// 	b2polygonShape dynamicBox;// 	dynamicBox.SetAsBox(.5f,.5f);	GB2ShapeCache* sc = GB2ShapeCache::sharedGB2ShapeCache();	sc->addFixturesToBody(body,name.c_str());	//定义夹具// 	b2FixtureDef fixtureDef;// 	fixtureDef.shape = &dynamicBox;		//形状// 	fixtureDef.density = 1.0f;			//密度// 	fixtureDef.friction = 0.3f;			//摩擦系数// 	body->CreateFixture(&fixtureDef);// // 	CCNode* parent = this->getChildByTag(kTagparentNode);// // 	int IDx = (CCRANDOM_0_1() < 0.5 ? 0 : 1);// 	int IDy = (CCRANDOM_0_1() < 0.5 ? 0 : 1);// 	if (IDx==0 && IDy==0)// 	{// 		int a =100;// 		body->SetUserData(&a);// 	}// 	CCPhysicssprite* sprite = CCPhysicssprite::createWithTexture(m_pSpriteTexture,CCRectMake(32*IDx,32*IDy,32,32));// 	parent->addChild(sprite);// 	sprite->setB2Body(body);// 	sprite->setPTMRatio(PTM_RATIO);	//sprite->setposition( ccp( p.x,p.y) );//添加上这句在快速创建物理精灵时会出错	CCPhysicssprite* sprite = CCPhysicssprite::create( (name+".png").c_str());	this->addChild(sprite);	sprite->setB2Body(body);	sprite->setPTMRatio(PTM_RATIO);	//sprite->setposition( ccp(p.x,p.y) );	sprite->setAnchorPoint(sc->anchorPointForShape(name.c_str()));}voID HelloPhysicEditor::updata(float dt){	int veLocityIterations = 8;	int positionIterations = 1;	world->Step(dt,veLocityIterations,positionIterations);#if 0	//遍历刚体	for (b2Body* b=world->GetbodyList(); b; b=b->GetNext())	{		int* tmp = (int*)b->GetUserData();		if (*tmp == 100)		{			//千万不要在这里直接删除b指向的body对象，缓存后在后面删除			cclOG("body is a");		}	}	//遍历碰撞点	for ( b2Contact* c=world->GetContactList(); c; c=c->GetNext() )	{		////千万不要在这里直接删除c指向的碰撞点对象，缓存后在后面删除	}#endif	}视频中GB2ShapeCache-x.cpp的下载地址：http://download.csdn.net/download/yclmy/8408533

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总结：

物理编辑器真的太方便啦！

开心一刻：

蝙蝠深爱麻雀，却被拒绝，

蝙蝠：“为什么，这一切都是为什么？”

麻雀：“俺妈说了，长得黑也就算了，总爱晚上出去的男人都不是好鸟！”

【麦可网】Cocos2d-X跨平台游戏开发---教程下载:http://pan.baIDu.com/s/1kTio1Av

【麦可网】Cocos2d-X跨平台游戏开发---笔记系列:http://blog.csdn.net/qiulanzhu

总结

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