首页 > 代码库 > 编写小游戏《贪头蛇》第三篇
编写小游戏《贪头蛇》第三篇
源码下载地址:http://download.csdn.net/detail/oyangyufu/7492917
点击NEW GAME按钮,进入游戏主场景
代码:
游戏背景
layer = (CCLayer*)this->getChildren()->objectAtIndex(SnakeConstants::LAYER_BACKGROUND); layer->setTouchEnabled(false); //游戏背景 CCSize size = CCDirector::sharedDirector()->getWinSize(); CCTMXTiledMap *pTMXTiledMap = CCTMXTiledMap::create("map.tmx"); pTMXTiledMap->setAnchorPoint( ccp(0.5f, 0.5f) ); pTMXTiledMap->setPosition(ccp(size.width/2 , size.height/2)); layer->addChild(pTMXTiledMap);
退出键
layer = (CCLayer*)this->getChildren()->objectAtIndex(SnakeConstants::LAYER_UI); CCMenuItemImage *pCloseItem = CCMenuItemImage::create( "CloseNormal.png", "CloseSelected.png", this, menu_selector(SnakeScene::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); layer->addChild(pMenu);
4个方向键:
CCMenuItemImage* pUpImage = CCMenuItemImage::create("u1.png", "u2.png", this, menu_selector(SnakeScene::upCallBack)); pUpImage->setAnchorPoint(ccp(0.5, 0)); pUpImage->setPositionY(6.0f); CCMenuItemImage* pDownImage = CCMenuItemImage::create("d1.png", "d2.png", this, menu_selector(SnakeScene::downCallBack)); pDownImage->setAnchorPoint(ccp(0.5, 1)); pDownImage->setPositionY(-6.0f); CCMenuItemImage* pLeftImage = CCMenuItemImage::create("b1.png", "b2.png", this, menu_selector(SnakeScene::leftCallBack)); pLeftImage->setAnchorPoint(ccp(1, 0.5)); pLeftImage->setPositionX(-6.0f); CCMenuItemImage* pRightImage = CCMenuItemImage::create("f1.png", "f2.png", this, menu_selector(SnakeScene::rightCallBack)); pRightImage->setAnchorPoint(ccp(0, 0.5)); pRightImage->setPositionX(6.0f); CCMenu* ArrowMenu = CCMenu::create(pUpImage, pDownImage, pLeftImage, pRightImage, NULL); ArrowMenu->setPosition(50, 50); layer->addChild(ArrowMenu);
游戏分数:
mScoreText = CCLabelTTF::create("Score: 0", "Plok.ttf", 20); mScoreText->setPosition(ccp(0, size.height - 10)); mScoreText->setAnchorPoint(ccp(0, 0.5)); layer->addChild(mScoreText);游戏开始语
mTitleText = CCLabelTTF::create("Play Game Snake!", "Plok.ttf", 30); mTitleText->setPosition(ccp(size.width/2, size.height/2)); layer->addChild(mTitleText); mTitleText->setScale(0.0f);
游戏结束语
mGameOverText = new CCLabelTTF(); mGameOverText->initWithString("Game Over!", "Plok.ttf", 30); mGameOverText->setPosition(ccp(size.width/2, size.height/2)); mGameOverText->retain(); mGameOverText->autorelease();
两个定时器
schedule(schedule_selector(SnakeScene::ScheduleTick1), 0.4f); //播放游戏开始语 schedule(schedule_selector(SnakeScene::GameCircle), 0.5f); //判断游戏是否结束
//游戏开始语 void SnakeScene::ScheduleTick1( float dt ) { float scale = mTitleText->getScale(); if(scale < 0.8)//从0倍缩放到0.8倍 { mTitleText->setScale(scale+0.1); } else //删除游戏开始语 { CCLayer* layer = (CCLayer*)this->getChildren()->objectAtIndex(SnakeConstants::LAYER_UI); unschedule(schedule_selector(SnakeScene::ScheduleTick1)); layer->removeChild(mTitleText); m_bGameRunning = true;//开始运行游戏 } }
0.5秒蛇移动一次
void SnakeScene::GameCircle( float dt ) { if(m_bGameRunning) { if(!mSnake->Move())//0结束 { OnGameOver(); } HandleNewSnakePosition(); } }
蛇的称动及碰撞检测
boolean Snake::Move() { mLastMoveDirection = mDirection; if(m_bGrow) { m_bGrow = false; /* If the snake should grow, * simply add a new part in the front of the tail, * where the head currently is. */ SnakeTailPart* newTailPart = new SnakeTailPart(m_pSnakeHead);//每一节 newTailPart->setScale(0.6f); this->addChild(newTailPart); marrTail.insertObject(newTailPart, 0);//marrTail管理整条蛇 } else { if(marrTail.count() > 0) { /* First move the end of the tail to where the head currently is. */ SnakeTailPart* tailEnd = (SnakeTailPart*)marrTail.lastObject(); marrTail.removeLastObject(false); tailEnd->SetCell(*m_pSnakeHead); marrTail.insertObject(tailEnd, 0); } } /* The move the head into the direction of the snake. 重设蛇头的位置*/ m_pSnakeHead->SetCell(GetNextX(), GetNextY()); //检查蛇头跟蛇尾相撞 for(int i = marrTail.count() - 1; i >= 0; i--) { if(m_pSnakeHead->IsInSameCell(*(SnakeTailPart*)marrTail.objectAtIndex(i))) { return false; } } return true; }创建蛇与青蛙
//主角蛇 mSnake = new Snake(RIGHT, 0, SnakeConstants::CELLS_VERTICAL/2); mSnake->autorelease(); mSnake->GetHead()->Animate(1); mSnake->Grow(); layer = (CCLayer*)this->getChildren()->objectAtIndex(SnakeConstants::LAYER_SNAKE); layer->addChild(mSnake); //青蛙 mFrog = new Frog(0, 0); mFrog->autorelease(); mFrog->Animate(1); this->SetFrogToRandomCell();//随机出现一个青蛙 layer = (CCLayer*)this->getChildren()->objectAtIndex(SnakeConstants::LAYER_FOOD); layer->addChild(mFrog);
检测蛇是否吃了青蛙
void SnakeScene::HandleNewSnakePosition() { const SnakeHead* snakeHead = mSnake->GetHead(); if(snakeHead->GetCellX() < 0 || snakeHead->GetCellX() >= SnakeConstants::CELLS_HORIZON || snakeHead->GetCellY() < 0 || snakeHead->GetCellY() >= SnakeConstants::CELLS_VERTICAL) //蛇活动的区域 { OnGameOver(); } else if(snakeHead->IsInSameCell(*mFrog))//蛇吃了青蛙加分、显示下一个青蛙 { m_nScore += 50; char score[128] = {0}; sprintf(score, "Score: %d", m_nScore); mScoreText->setString(score); mSnake->Grow(); PlayMunchSound();//吃到的声音 this->SetFrogToRandomCell();//随机显示下一个青蛙
方向键回调函数,根据上下左右键方向旋转蛇的方向
void SnakeScene::upCallBack( CCObject* sender ) { mSnake->SetDirection(UP); } void SnakeScene::downCallBack( CCObject* sender ) { mSnake->SetDirection(DOWN); } void SnakeScene::leftCallBack( CCObject* sender ) { mSnake->SetDirection(LEFT); } void SnakeScene::rightCallBack( CCObject* sender ) { mSnake->SetDirection(RIGHT);
void Snake::SetDirection( const Direction dirction ) { if(mLastMoveDirection != Opposite(dirction)) { mDirection = dirction; m_pSnakeHead->SetRotation(dirction); } }蛇的方向度
void SnakeHead::SetRotation(const Direction dirction) { switch(dirction) { case UP: this->setRotation(180); break; case DOWN: this->setRotation(0); break; case LEFT: this->setRotation(90); break; case RIGHT: this->setRotation(270); break; } }
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