cocos2dx 精灵的碰撞检测和消灭

在上一篇的基础上增加了一点内容，必要的注释都写在代码里了，，就直接贴代码吧，我也懒得写详细的过程。

HelloWorldSence.h

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#ifndef __HELLOWORLD_SCENE_H__

#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

using namespace cocos2d;

class HelloWorld : public cocos2d::CCLayerColor

{

public:

// Method 'init' in cocos2d-x returns bool, instead of 'id' in cocos2d-iphone (an object pointer)

virtual bool init();

// there's no 'id' in cpp, so we recommend to return the class instance pointer

static cocos2d::CCScene* scene();

// a selector callback

void menuCloseCallback(CCObject* pSender);

// preprocessor macro for "static create()" constructor ( node() deprecated )

CREATE_FUNC(HelloWorld);

void addTarget();

void spriteMoveFinished(CCNode *sender);

void gameLogic(cocos2d::CCTime dt);

void ccTouchesEnded(CCSet *touches, CCEvent *event);

CCArray *aarayTarget;//敌人

CCArray *arrayProjectile;//飞镖

void update(CCTime dt);

};

#endif // __HELLOWORLD_SCENE_H__

HelloWorldScence.cpp

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#include "HelloWorldScene.h"

#include "SimpleAudioEngine.h"

using namespace cocos2d;

using namespace CocosDenshion;

CCScene* HelloWorld::scene()

{

// 'scene' is an autorelease object

CCScene *scene = CCScene::create();

// 'layer' is an autorelease object

HelloWorld *layer = HelloWorld::create();

// add layer as a child to scene

scene->addChild(layer);

// return the scene

return scene;

}

// on "init" you need to initialize your instance

bool HelloWorld::init()

{

//////////////////////////////

// 1. super init first

if ( CCLayerColor::initWithColor(ccc4(255, 255, 255, 255)) )

{

CCSize winSize = CCDirector::sharedDirector()->getWinSize();//获取屏幕大小

arrayProjectile = CCArray::create();

aarayTarget = CCArray::create();

float sprite_scale = 2.0;

CCSprite *Player = CCSprite::create("Player.png");

Player->setScale(sprite_scale);

Player->setPosition(ccp(Player->getContentSize().width*sprite_scale/2.0, winSize.height/2.0));

this->addChild(Player);

aarayTarget->retain();

arrayProjectile->retain();

this->schedule(schedule_selector(HelloWorld::gameLogic), 1.0);

this->schedule(schedule_selector(HelloWorld::update));

this->setTouchEnabled(true);

return true;

}

else{

return false;

}

}

void HelloWorld::gameLogic(cocos2d::CCTime dt){

this->addTarget();

}

void HelloWorld::addTarget(){

CCSize winSize = CCDirector::sharedDirector()->getWinSize();

CCSprite *target = CCSprite::create("Target.png");

//随机位置

int minY = target->getContentSize().height/2.0;

int maxY = winSize.height - target->getContentSize().height/2.0;

int rangeY = maxY - minY;

int actualY = rand()%rangeY + minY;

target->setPosition(ccp(winSize.width - target->getContentSize().width/2.0, actualY));

target->setTag(1);

this->addChild(target);

aarayTarget->addObject(target);

//随机速度

float minDuration = 2.0;

float maxDuration = 4.0;

int rangeDuration = maxDuration - minDuration;

float actualDuration = rand()%rangeDuration + minDuration;

CCFiniteTimeAction *actionMove = CCMoveTo::create(actualDuration, ccp(0 - target->getContentSize().width/2.0, actualY));//0代表屏幕外，这句表示在3秒内从初始位置移动到屏幕外

//增加一个回调函数，回收移动到屏幕外的精灵

CCFiniteTimeAction *actionMoveDone = CCCallFuncN::create(this, callfuncN_selector(HelloWorld::spriteMoveFinished));

target->runAction(CCSequence::create(actionMove,actionMoveDone,NULL));

}

void HelloWorld::spriteMoveFinished(cocos2d::CCNode *sender){

CCSprite *sprite = (CCSprite *)sender;

// this->removeChild(sprite, true);

if (sprite->getTag() == 1) {

aarayTarget->removeObject(sprite);//清除敌人

}else if(sprite->getTag() == 2){

arrayProjectile->removeObject(sprite);//清除飞镖

}

}

//发射飞镖

void HelloWorld::ccTouchesEnded(cocos2d::CCSet *touches, cocos2d::CCEvent *event){

CCTouch *touch = (CCTouch *)touches->anyObject();

CCPoint location = touch->getLocationInView();

location = this->convertTouchToNodeSpace(touch);

CCSize winSize = CCDirector::sharedDirector()->getWinSize();

CCSprite *projectile = CCSprite::create("Projectile.png");

projectile->setPosition(ccp(20, winSize.height/2));

float offX = location.x - projectile->getPositionX();

float offY = location.y - projectile->getPositionY();

if (offX <= 0) {

return;

}

projectile->setTag(2);

this->addChild(projectile);

arrayProjectile->addObject(projectile);

float angle = offY/offX;

float realX= winSize.width + projectile->getContentSize().width/2;

float realY = realX * angle + projectile->getPositionY();

CCPoint finalPosition = ccp(realX, realY);

//获取飞镖飞行时间

float length = sqrtf(realX *realX + realY*realY);

float velocity = 480;

float realMoveDuration = length/velocity;

projectile->runAction(CCSequence::create(CCMoveTo::create(realMoveDuration, finalPosition),CCCallFuncN::create(this, callfuncN_selector(HelloWorld::spriteMoveFinished)),NULL));

}

//碰撞检测，消除飞镖和敌人

void HelloWorld::update(cocos2d::CCTime dt){

for (int i = 0; i < aarayTarget->count(); i++) {

CCSprite *target = (CCSprite *)aarayTarget->objectAtIndex(i);

for (int j = 0; j < arrayProjectile->count(); j++) {

CCSprite *projectile = (CCSprite *)arrayProjectile->objectAtIndex(j);

if (target->boundingBox().intersectsRect(projectile->boundingBox())) {

aarayTarget->removeObjectAtIndex(i);

arrayProjectile->removeObjectAtIndex(j);

this->removeChild(target);

this->removeChild(projectile);

break;

}

}

}

}

void HelloWorld::menuCloseCallback(CCObject* pSender)

{

CCDirector::sharedDirector()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)

exit(0);

#endif

}

运行结果截图：