cocos2d-x3.x 像素碰撞

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
using namespace cocos2d;

class HelloWorld : public cocos2d::Layer
{
public:
// there's no 'id' in cpp, so we recommend returning the class instance pointer
static cocos2d::Scene* createScene();

// Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
virtual bool init();

// a selector callback
void menuCloseCallback(cocos2d::Ref* pSender);

// implement the "static create()" method manually
CREATE_FUNC(HelloWorld);

cocos2d::EventListenerTouchOneByOne *_listener;
cocos2d::Sprite *bulletForTower12;
cocos2d::Sprite *m_imgMan;
cocos2d::RenderTexture *m_pRenderTexture;
cocos2d::Label *m_pLabTips;

virtual bool onTouchBegan(Touch *touch, Event *unused_event);
virtual void onTouchEnded(Touch *touch, Event *unused_event);

};

#endif // __HELLOWORLD_SCENE_H__

<pre name="code" class="cpp">#include "HelloWorldScene.h"USING_NS_CC;Scene* HelloWorld::createScene(){// 'scene' is an autorelease objectauto scene = Scene::create();// 'layer' is an autorelease objectauto layer = HelloWorld::create();// add layer as a child to scenescene->addChild(layer);// return the scenereturn scene;}// on "init" you need to initialize your instancebool HelloWorld::init(){//////////////////////////////// 1. super init firstif ( !Layer::init() ){return false;}m_imgMan = Sprite::create("tangfa09/tafang09-1-zidan0002.png");m_imgMan->setPosition(Vec2(400, 200));this->addChild(m_imgMan, 1);m_pRenderTexture = RenderTexture::create(m_imgMan->getContentSize().width, m_imgMan->getContentSize().height, Texture2D::PixelFormat::RGBA8888);m_pRenderTexture->ignoreAnchorPointForPosition(true);m_pRenderTexture->setPosition(Vec2(400, 200));m_pRenderTexture->setAnchorPoint(Vec2::ZERO);this->addChild(m_pRenderTexture, 0, 1);m_pRenderTexture->setVisible(false); //将绘制出来的图片隐藏_listener=EventListenerTouchOneByOne::create();_listener->onTouchBegan = CC_CALLBACK_2(HelloWorld::onTouchBegan, this);_listener->onTouchEnded=CC_CALLBACK_2(HelloWorld::onTouchEnded, this);Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(_listener, this);return true;}bool HelloWorld::onTouchBegan(Touch *touch, Event *unused_event){bool isTouched = false;auto touchPoint = touch->getLocationInView();auto glPoint = Director::getInstance()->convertToGL(touchPoint);if (m_imgMan->boundingBox().containsPoint(glPoint)) {Color4B color4B = {0, 0, 0, 0};Point nodePos = m_imgMan->convertTouchToNodeSpace(touch);unsigned int x = nodePos.x;unsigned int y = m_imgMan->getContentSize().height - nodePos.y;Point point = m_imgMan->getPosition();//开始准备绘制//绘制完成后清理画布的内容m_pRenderTexture->beginWithClear(0, 0, 0, 0);//绘制使用的临时精灵，与原图是同一图片auto pTempSpr = Sprite::createWithSpriteFrame(m_imgMan->displayFrame());pTempSpr->setPosition(Vec2(pTempSpr->getContentSize().width / 2, pTempSpr->getContentSize().height / 2));//绘制pTempSpr->visit();//结束绘制m_pRenderTexture->end();//通过画布拿到这张画布上每个像素点的信息，封装到CCImage中Image* pImage = m_pRenderTexture->newImage();//获取像素数据unsigned char* data_ = pImage->getData();unsigned int *pixel = (unsigned int *)data_;pixel = pixel + (y * (int)pTempSpr->getContentSize().width) * 1 + x * 1;//R通道color4B.r = *pixel & 0xff;//G通道color4B.g = (*pixel >> 8) & 0xff;//B通道color4B.b = (*pixel >> 16) & 0xff;//Alpha通道，我们有用的就是Alphacolor4B.a = (*pixel >> 24) & 0xff;CCLOG("当前点击的点的: alpha = %d", color4B.a);if (color4B.a > 50) {isTouched = true;} else {isTouched = false;}}if (m_pLabTips) {m_pLabTips->removeFromParentAndCleanup(true);m_pLabTips = NULL;}return isTouched;}void HelloWorld::onTouchEnded(Touch *touch, Event *unused_event){if (m_pLabTips) {m_pLabTips->removeFromParentAndCleanup(true);m_pLabTips = NULL;}m_pLabTips = Label::createWithTTF("NO", "fonts/Marker Felt.ttf", 30);m_pLabTips->setAnchorPoint(Vec2::ZERO);m_pLabTips->setPosition(Vec2(300.0f, 100.0f));m_pLabTips->setColor(Color3B::YELLOW);this->addChild(m_pLabTips, 1);}