cocos2dx视频教程进阶篇--第2天--打砖块游戏-box2d物理引擎

感谢大家的鼓励和支持，今天进阶篇2奉献给大家。

不了解cocos2dx基本概念的朋友，请移步

http://blog.csdn.net/s_xing/article/details/18557631。

转载请注明出处http://blog.csdn.net/s_xing/article/details/20165097

感觉直接看代码太枯燥的,请关注视频讲解

更新:高清avi视频和源代码已经提供下载：

百度网盘：http://pan.baidu.com/s/1ELk78里面的进阶篇。

今天一共讲了五堂课，学习的是老外的一个游戏。原文地址：http://www.raywenderlich.com/28602/intro-to-box2d-with-cocos2d-2-x-tutorial-bouncing-balls。源代码如下

1. 主场景

#include "HelloWorldScene.h"
#include "Box2dUtils.h"
#include "MyContactListener.h"
#include "GameOverScense.h"
#include "SimpleAudioEngine.h"USING_NS_CC;#define PTM_RATIO 32.0fCCScene* HelloWorld::scene()
{// 'scene' is an autorelease objectCCScene *scene = CCScene::create();// 'layer' is an autorelease objectHelloWorld *layer = HelloWorld::create();// add layer as a child to scenescene->addChild(layer);// return the scenereturn scene;
}// on "init" you need to initialize your instance
bool HelloWorld::init()
{//// 1. super init firstif ( !CCLayer::init() ){return false;}CCSize screenSize = CCDirector::sharedDirector()->getVisibleSize();CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();// 创建球的cocos2d图形_ballSprite  = CCSprite::create("ball.png");_ballSprite->setPosition(ccp(39, 300));this->addChild(_ballSprite);_paddleSprite = CCSprite::create("paddle.png");_paddleSprite->setPosition(ccp(120, 50));this->addChild(_paddleSprite);// 创建box2d世界_world = new b2World(b2Vec2(0, 0));// 创建球_ball = Box2dUtils::createDynamicBody(_ballSprite->getPositionX() / PTM_RATIO,_ballSprite->getPositionY() / PTM_RATIO,_ballSprite,_world);b2CircleShape circle;circle.m_radius = _ballSprite->getContentSize().width / 2 / PTM_RATIO;Box2dUtils::createFixture(&circle,10, 0, 1.0, _ball);_ball->ApplyLinearImpulse(_ball->GetMass() * b2Vec2(11, 22), _ball->GetWorldCenter());// 添加底座_paddle = Box2dUtils::createDynamicBody(_paddleSprite->getPositionX() / PTM_RATIO,_paddleSprite->getPositionY() / PTM_RATIO,_paddleSprite,_world);b2PolygonShape boxShape;boxShape.SetAsBox(_paddleSprite->getContentSize().width / 2.0f / PTM_RATIO,_paddleSprite->getContentSize().height / 2.0f / PTM_RATIO);Box2dUtils::createFixture(&boxShape,8, 0, 0.5, _paddle);// 添加目标   被打击的砖块const int padding  = 10; float offsetX = 150.0f;for (int i = 0; i < 4; i ++){CCSprite* block = CCSprite::create("block.png");block->setPosition(ccp(offsetX, 400.0));block->setTag(3);this->addChild(block);//物理 实体b2Body* blockBody = Box2dUtils::createDynamicBody(offsetX/ PTM_RATIO, 400 / PTM_RATIO,block,_world);b2PolygonShape blockBox;blockBox.SetAsBox(block->getContentSize().width / 2.0f / PTM_RATIO,block->getContentSize().height / 2.0f / PTM_RATIO);Box2dUtils::createFixture(&blockBox,10.0f, 0.0f, 0.2f, blockBody);offsetX += (padding + block->getContentSize().width);}// 创建4面墙// b2BodyDef -->b2Bodyb2BodyDef groundBodyDef;groundBodyDef.type = b2_staticBody;groundBodyDef.position.Set(0, 0); // 相当于cocos2d 中的锚点_groundBody = _world->CreateBody(&groundBodyDef);// b2FixtureDef -->b2Fixtureb2EdgeShape groundShape;groundShape.Set(b2Vec2(0, 0), b2Vec2(screenSize.width / PTM_RATIO, 0));b2FixtureDef groundFixDef;groundFixDef.shape = &groundShape;groundFixDef.friction = 0.9f;_bottom = _groundBody->CreateFixture(&groundFixDef);// 创建左面 墙b2EdgeShape leftWall;leftWall.Set(b2Vec2(0, 0), b2Vec2(0, screenSize.height / PTM_RATIO));groundFixDef.shape = &leftWall;_groundBody->CreateFixture(&groundFixDef);// 创建右面的墙b2EdgeShape rightWall;rightWall.Set(b2Vec2(screenSize.width / PTM_RATIO, 0), b2Vec2(screenSize.width / PTM_RATIO, screenSize.height / PTM_RATIO));groundFixDef.shape = &rightWall;_groundBody->CreateFixture(&groundFixDef);// 创建 顶部b2EdgeShape top;top.Set(b2Vec2(0, screenSize.height / PTM_RATIO), b2Vec2(screenSize.width / PTM_RATIO, screenSize.height / PTM_RATIO));groundFixDef.shape = ⊤_groundBody->CreateFixture(&groundFixDef);this->scheduleUpdate();// 实现  指哪打哪  鼠标拖动到哪里 指定的物体移动到哪里// box2d joint 关节  this->setTouchEnabled(true);CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);_mouseJoint = NULL;// 平移关节 限制底座 只能水平方向移动b2PrismaticJointDef primaticJointDef;primaticJointDef.Initialize(_world->CreateBody(new b2BodyDef),_paddle,_paddle->GetWorldCenter(),b2Vec2(3.0, 0));_world->CreateJoint(&primaticJointDef);listener = new MyContactListener;_world->SetContactListener(listener);_score = 0;CocosDenshion::SimpleAudioEngine::sharedEngine()->playBackgroundMusic("background-music-aac.WAV", true);return true;
}bool HelloWorld::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent){CCPoint touchPos = pTouch->getLocation();b2Vec2  touchPhysicsPos(touchPos.x / PTM_RATIO,touchPos.y / PTM_RATIO);b2Fixture* paddleFix = _paddle->GetFixtureList(); //得到底座的 fixture ---包含了形状信息/*CCRect paddleRect;   // 在cocos2d 世界中判断paddleRect.containsPoint(touchPos);*/if (paddleFix->TestPoint(touchPhysicsPos)){ //触摸点在paddle的范围内  在物理世界中判断// 鼠标关节  鼠标控制我们的底座    applyLinearImpulseb2MouseJointDef mouseJointDef;mouseJointDef.bodyA = _world->CreateBody(new b2BodyDef);mouseJointDef.bodyB = _paddle;mouseJointDef.maxForce = 1000.0 * _paddle->GetMass();mouseJointDef.target = touchPhysicsPos; //设置物体的目标位置_mouseJoint = (b2MouseJoint*)_world->CreateJoint(&mouseJointDef);//CCLog("touch began true.\n");return true;// 该 touch 代理上的ccTouchMoved  ccTouchEnded 会得到执行}CCLog("touch began false.\n");return false; // 该 touch 代理上的ccTouchMoved  ccTouchEnded 不会得到执行
}void HelloWorld::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent){if (_mouseJoint){CCPoint touchPos = pTouch->getLocation();b2Vec2  touchPhysicsPos(touchPos.x / PTM_RATIO,touchPos.y / PTM_RATIO);_mouseJoint->SetTarget(touchPhysicsPos);//设置物体的目标位置}//CCLog("touch ccTouchMoved func.\n");
}void HelloWorld::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent){if (_mouseJoint){_world->DestroyJoint(_mouseJoint);_mouseJoint = NULL;}//CCLog("touch ccTouchEnded func.\n");
}int _getTagForBody(b2Body* body){if (body->GetUserData()){CCSprite* sp = (CCSprite*) body->GetUserData();return sp->getTag();}return -1;
}void HelloWorld::update(float delta){_world->Step(delta, 6, 6);for(b2Body* body = _world->GetBodyList(); body != NULL; body = body->GetNext()){if (body->GetUserData()){CCSprite* sp = (CCSprite*)body->GetUserData();if (sp == _ballSprite){ // 限制球速b2Vec2 spped = body->GetLinearVelocity();if (spped.LengthSquared() > 200){body->SetLinearDamping(0.9); //设置 减震之后 持续生效}else if (spped.LengthSquared() <200){body->SetLinearDamping(0.0); //设置 减震之后 持续生效if  (spped.LengthSquared() < 60){body->ApplyLinearImpulse(body->GetMass() * 5.0 * spped,body->GetWorldCenter());}}}sp->setPosition(ccp(body->GetPosition().x * PTM_RATIO,body->GetPosition().y *PTM_RATIO));}}b2Body* bodyToDestroy = NULL;vector<MyContactPeer>::iterator it;for (it = listener->_contacts.begin();it != listener->_contacts.end();it ++){MyContactPeer curContact = *it;b2Body*   bodyA = curContact.fixA->GetBody();b2Body*  bodyB = curContact.fixB->GetBody();int tagA, tagB;tagA = _getTagForBody(bodyA);tagB = _getTagForBody(bodyB);// 小球和地面碰撞 失败if (bodyA == _ball && curContact.fixB == _bottom){//CCLog("fail");CCDirector::sharedDirector()->replaceScene(GameOverScene::scenseWithWin(false));}else if (bodyB == _ball && curContact.fixA == _bottom){//CCLog("fail");CCDirector::sharedDirector()->replaceScene(GameOverScene::scenseWithWin(false));}else if (bodyA == _ball && 3 == tagB){//CCLog("kill block");bodyToDestroy = bodyB;}else if (bodyB == _ball && 3 == tagA){//CCLog("kill block");//CCLog("kill block");bodyToDestroy = bodyA;}}if (bodyToDestroy){((CCSprite*)bodyToDestroy->GetUserData())->removeFromParentAndCleanup(true);_world->DestroyBody(bodyToDestroy);                _score ++;CocosDenshion::SimpleAudioEngine::sharedEngine()->playEffect("blip.WAV");CCLog("_score is %d", _score);if (_score >= 4){CCDirector::sharedDirector()->replaceScene(GameOverScene::scenseWithWin(true));}}}void HelloWorld::menuCloseCallback(CCObject* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
#elseCCDirector::sharedDirector()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)exit(0);
#endif
#endif
}

转载注明出处:http://blog.csdn.net/s_xing/article/details/20836727

csdn不给力,文章长度限制,所以请大家跳到续篇-- http://blog.csdn.net/s_xing/article/details/20836693

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