Breakout box2d学习代码

#include "HelloWorldScene.h" #include "GameOverLayer.h" #include "SimpleAudioEngine.h" using namespace cocos2d; #define PTM_RATIO 32 // 比例 HelloWorld::HelloWorld() { m_world = NULL; m_groundBody = NULL; m_bottomFixture = NULL; m_ballFixture = NULL; m_paddleBody = NULL; m_paddleFixture = NULL; m_mouseJoint = NULL; m_contactListener = NULL; } HelloWorld::~HelloWorld() { delete m_world; m_groundBody = NULL; m_paddleBody = NULL; delete m_contactListener; } CCScene* HelloWorld::scene() { CCScene * scene = NULL; do { // 'scene' is an autorelease object scene = CCScene::create(); CC_BREAK_IF(! scene); // 'layer' is an autorelease object HelloWorld *layer = HelloWorld::create(); CC_BREAK_IF(! layer); // add layer as a child to scene scene->addChild(layer); } while (0); // return the scene return scene; } // on "init" you need to initialize your instance bool HelloWorld::init() { bool bRet = false; do { CC_BREAK_IF(! CCLayer::init()); // quit menu CCMenuItemImage *pCloseItem = CCMenuItemImage::create( "CloseNormal.png", "CloseSelected.png", this, menu_selector(HelloWorld::menuCloseCallback)); CC_BREAK_IF(! pCloseItem); pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20)); CCMenu* pMenu = CCMenu::create(pCloseItem, NULL); pMenu->setPosition(CCPointZero); CC_BREAK_IF(! pMenu); this->addChild(pMenu, 1); // game world initWorld(); // draw block drawBlock(); setTouchEnabled(true); scheduleUpdate(); bRet = true; } while (0); return bRet; } void HelloWorld::initWorld() { CCSize winSize = CCDirector::sharedDirector()->getWinSize(); // create world b2Vec2 gravity = b2Vec2(0.0f, 0.0f); // 模仿真空 m_world = new b2World(gravity); m_world->SetAllowSleeping(true); // create edge around the screen b2BodyDef groundBodyDef; groundBodyDef.position.Set(0, 0); m_groundBody = m_world->CreateBody(&groundBodyDef); b2EdgeShape groundBox; b2FixtureDef groundBoxDef; groundBoxDef.shape = &groundBox; groundBox.Set(b2Vec2(0, 0), b2Vec2(winSize.width / PTM_RATIO, 0)); // bottom m_bottomFixture = m_groundBody->CreateFixture(&groundBoxDef); groundBox.Set(b2Vec2(0, 0), b2Vec2(0, winSize.height / PTM_RATIO)); // left m_groundBody->CreateFixture(&groundBoxDef); groundBox.Set(b2Vec2(0, winSize.height / PTM_RATIO), b2Vec2(winSize.width / PTM_RATIO, winSize.height / PTM_RATIO)); // up m_groundBody->CreateFixture(&groundBoxDef); groundBox.Set(b2Vec2(winSize.width / PTM_RATIO, 0), b2Vec2(winSize.width / PTM_RATIO, winSize.height / PTM_RATIO)); // right m_groundBody->CreateFixture(&groundBoxDef); // create sprite and add it to the layer CCSprite *ball = CCSprite::create("ball.jpg"); ball->setPosition(ccp(100, 100)); ball->setTag(1); this->addChild(ball); // create ball body b2BodyDef ballBodyDef; ballBodyDef.type = b2_dynamicBody; ballBodyDef.position.Set(100 / PTM_RATIO, 100 / PTM_RATIO); ballBodyDef.userData = ball; b2Body *ballBody = m_world->CreateBody(&ballBodyDef); // create circle shape b2CircleShape circle; circle.m_radius = 26.0 / PTM_RATIO; // create shape definition and add to body b2FixtureDef ballShapeDef; ballShapeDef.shape = &circle; ballShapeDef.density = 1.0f; ballShapeDef.friction = 0.0f; ballShapeDef.restitution = 1.0f; m_ballFixture = ballBody->CreateFixture(&ballShapeDef); // 施加一个冲量,作为球的初始动力 b2Vec2 force = b2Vec2(15, 15); ballBody->ApplyLinearImpulse(force, ballBodyDef.position); // create paddle and add it to the layer CCSprite *paddle = CCSprite::create("Paddle.jpg"); paddle->setPosition(ccp(winSize.width / 2, 50)); this->addChild(paddle); // create paddle body b2BodyDef paddleBodyDef; paddleBodyDef.type = b2_dynamicBody; paddleBodyDef.position.Set(winSize.width / 2 / PTM_RATIO, 50 / PTM_RATIO); paddleBodyDef.userData = paddle; m_paddleBody = m_world->CreateBody(&paddleBodyDef); // create paddle shape b2PolygonShape paddleShape; paddleShape.SetAsBox(paddle->getContentSize().width / PTM_RATIO / 2, paddle->getContentSize().height / PTM_RATIO / 2); b2FixtureDef paddleShapeDef; paddleShapeDef.shape = &paddleShape; paddleShapeDef.density = 10.0f; paddleShapeDef.friction = 0.4f; paddleShapeDef.restitution = 0.1f; m_paddleFixture = m_paddleBody->CreateFixture(&paddleShapeDef); // restrict paddle along the x axis b2PrismaticJointDef jointDef; b2Vec2 worldAxis(1.0f, 0.0f); // 限定的方向 jointDef.collideConnected = true; // 可能碰撞需要设置为true // 初始化四个参数：被限定物体，限定区域，限定点，限定方向 jointDef.Initialize(m_paddleBody, m_groundBody, m_paddleBody->GetWorldCenter(), worldAxis); m_world->CreateJoint(&jointDef); // create contact listener m_contactListener = new MyContactListener(); m_world->SetContactListener(m_contactListener); } void HelloWorld::drawBlock() { for (int i = 0; i < 10; i++) { for (int j = 0; j < 4; j++) { static int padding = 20; CCSprite *block = CCSprite::create("block.png"); int xOffset = padding + block->getContentSize().width / 2 + (block->getContentSize().width + padding) * i; block->setPosition(ccp(xOffset, 460 - j*40)); block->setTag(2); this->addChild(block); b2BodyDef blockBodyDef; blockBodyDef.type = b2_dynamicBody; blockBodyDef.position.Set(xOffset / PTM_RATIO, (450 - j*40)/ PTM_RATIO); blockBodyDef.userData = block; b2Body *blockBody = m_world->CreateBody(&blockBodyDef); b2PolygonShape blockShape; blockShape.SetAsBox(block->getContentSize().width / PTM_RATIO / 2, block->getContentSize().height / PTM_RATIO /2); b2FixtureDef blockShapeDef; blockShapeDef.shape = &blockShape; blockShapeDef.density = 10.0f; blockShapeDef.friction = 0.0f; blockShapeDef.restitution = 0.1f; blockBody->CreateFixture(&blockShapeDef); } } } void HelloWorld::menuCloseCallback(CCObject* pSender) { // "close" menu item clicked CCDirector::sharedDirector()->end(); } void HelloWorld::update(float dt) { m_world->Step(dt, 10, 10); for (b2Body *b = m_world->GetBodyList(); b; b = b->GetNext()) { if (b->GetUserData() != NULL) { CCSprite *sprite = (CCSprite*)b->GetUserData(); if (sprite->getTag() == 1) { int maxSpeed = 20; b2Vec2 velocity = b->GetLinearVelocity(); float32 speed = velocity.Length(); // 添加线性阻尼来限制速度 if (speed > maxSpeed) b->SetLinearDamping(0.8f); else if (speed < maxSpeed) b->SetLinearDamping(0.0f); } sprite->setPosition(ccp(b->GetPosition().x * PTM_RATIO, b->GetPosition().y * PTM_RATIO)); sprite->setRotation(-1 * CC_RADIANS_TO_DEGREES(b->GetAngle())); } } std::vector<MyContact>::iterator pos; // 碰撞 std::vector<b2Body*>toDestory; // 销毁的block for (pos = m_contactListener->m_contacts.begin(); pos != m_contactListener->m_contacts.end(); ++ pos) { // 碰撞到bottom MyContact contact = *pos; if (contact.fixtureA == m_bottomFixture && contact.fixtureB == m_ballFixture || contact.fixtureA == m_ballFixture && contact.fixtureB == m_bottomFixture) { // CCLog("Ball hit bottom!"); CocosDenshion::SimpleAudioEngine::sharedEngine()->playEffect("applause.wav"); CCScene *scene = CCScene::create(); scene->addChild(GameOverLayer::create()); CCDirector::sharedDirector()->replaceScene(CCTransitionFade::create(2.0f, scene,ccWHITE)); } // 碰撞到block b2Body *bodyA = contact.fixtureA->GetBody(); b2Body *bodyB = contact.fixtureB->GetBody(); if (bodyA->GetUserData() != NULL && bodyB->GetUserData() != NULL) { CCSprite *spriteA = (CCSprite*)bodyA->GetUserData(); CCSprite *spriteB = (CCSprite*)bodyB->GetUserData(); // spriteA is ball, spriteB is block if (spriteA->getTag() == 1 && spriteB->getTag() == 2) { if ( std::