2.cocos2d-x坐标体系（UI坐标系，GL坐标系，本地坐标，世界坐标，节点坐标）

图： UI坐标系

图： GL坐标系

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

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

Coordinate.h

#ifndef __COORDINATE_H__

#define __COORDINATE_H__

#include "cocos2d.h"

USING_NS_CC;

//坐标体系

class Coordinate :public CCLayer

{

public:

    static CCScene * scene();

    CREATE_FUNC(Coordinate);

    bool init();

    //触摸事件开始的一个事件，第二个参数只是为了做苹果的兼容才保留的

    virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);

};

#endif

Coordinate.cpp

#include "Coordinate.h"

#include "AppMacros.h"

CCScene * Coordinate::scene() {

    CCScene * scene = CCScene::create();

    Coordinate * layer = Coordinate::create();

    scene->addChild(layer);

    return scene;

}

bool Coordinate::init()

{

    CCLayer::init();

    //打开触摸开关

    setTouchEnabled(true);

    //下面的kCCTouchesOneByOne是一个枚举：

    //typedef enum {

    //  kCCTouchesAllAtOnce,

    //  kCCTouchesOneByOne,

    //} ccTouchesMode;

    setTouchMode(kCCTouchesOneByOne);

    //创建一个精灵

    CCSprite *big = CCSprite::create();

    big->setColor(ccRED);

    //设置锚点

    big->setAnchorPoint(ccp(0, 0));

    //表示的是一个矩形,CCRectMake是一个宏

    big->setTextureRect(CCRectMake(0,0,150,150));

    big->setPosition(ccp(100,100));

    addChild(big);

    CCSprite *little = CCSprite::create();

    little->setColor(ccYELLOW);

    little->setAnchorPoint(ccp(0,0));

    little->setTextureRect(CCRectMake(0, 0, 50, 50));

    little->setPosition(ccp(100,100));

    //从下面可以知道一个精灵中可以添加另外一个精灵

    big->addChild(little);

    CCLog("little x = %f,y = %f", little->getPositionX(), little->getPositionY());

    CCPoint toWorld = big->convertToWorldSpace(little->getPosition());

    CCLog("toWorld x = %f,y=%f", toWorld.x, toWorld.y);

    CCSprite *little2 = CCSprite::create();

    little2->setColor(ccGREEN);

    little2->setAnchorPoint(ccp(0, 0));

    little2->setTextureRect(CCRectMake(0,0,50,50));

    little2->setPosition(ccp(0,0));

    addChild(little2);

    CCPoint toNode = big->convertToNodeSpace(little2->getPosition());

    CCLog("little2 x = %f,y = %f", little2->getPositionX(), little2->getPositionY());

    CCLog("toNode x = %f,y = %f", toNode.x, toNode.y);

    CCMoveBy *by = CCMoveBy::create(2,ccp(200,0));

    CCMoveBy *by2 = (CCMoveBy *)by->reverse();

    //最后一个NULL是一个哨兵

    CCSequence *seq = CCSequence::create(by, by2, NULL);

    big->runAction(CCRepeatForever::create(seq));

    //第一个参数是：duration

    //第二个参数是：移动位置.表示上下移动

    CCMoveBy *lby = CCMoveBy::create(2, ccp(0, -100));

    CCMoveBy *lby2 = (CCMoveBy *)lby->reverse();

    CCSequence *lseq = CCSequence::create(lby, lby2, NULL);

    little->runAction(CCRepeatForever::create(lseq));

    return true;

}

//触摸事件开始

bool Coordinate::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)

{

    CCLog("ccTouchBegan");

    //基于OpenGL的世界坐标

    CCPoint pGl = pTouch->getLocation();

    CCLog("GL:x = %f,y = %f", pGl.x, pGl);

    //基于UI屏幕的坐标

    CCPoint pUi = pTouch->getLocationInView();

    CCLog("UI:x = %f,y = %f", pUi.x, pUi.y);

    //将基于GL的坐标转换成为UI的屏幕坐标

    CCPoint toUi = CCDirector::sharedDirector()->convertToUI(pGl);

    CCLog("ToUix = %f ,y = %f", toUi.x, toUi.y);

    //将屏幕坐标的转换成为本地坐标

    CCPoint toGL = CCDirector::sharedDirector()->convertToGL(pUi);

    CCLog("ToGLx = %f,y=%f", toGL.x, toGL.y);

    //转换成节点坐标

    CCPoint node = this->convertToNodeSpace(pGl);

    CCLog("Node:x = %f,y = %f", node.x, node.y);

    return false;

}

运行结果：