圖： UI坐標系

圖： GL坐標系

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

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

Coordinate.h

#ifndef __COORDINATE_H__

#define __COORDINATE_H__

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#include "cocos2d.h"

USING_NS_CC;

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//坐標體系

class Coordinate :public CCLayer

{

public:

??? static CCScene * scene();

??? CREATE_FUNC(Coordinate);

??? bool init();

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??? //觸摸事件開始的一個事件，第二個參數只是為了做蘋果的兼容才保留的

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

};

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#endif

Coordinate.cpp

#include "Coordinate.h"

#include "AppMacros.h"

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CCScene * Coordinate::scene() {

??? CCScene * scene = CCScene::create();

??? Coordinate * layer = Coordinate::create();

??? scene->addChild(layer);

??? return scene;

}

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bool Coordinate::init()

{

??? CCLayer::init();

??? //打開觸摸開關

??? setTouchEnabled(true);

???

??? //下面的kCCTouchesOneByOne是一個枚舉：

??? //typedef enum {

??? //? kCCTouchesAllAtOnce,

??? //? kCCTouchesOneByOne,

??? //} ccTouchesMode;

??? setTouchMode(kCCTouchesOneByOne);

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??? //創建一個精靈

??? CCSprite *big = CCSprite::create();

??? big->setColor(ccRED);

??? //設置錨點

??? big->setAnchorPoint(ccp(0, 0));

??? //表示的是一個矩形,CCRectMake是一個宏

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

??? big->setPosition(ccp(100,100));

??? addChild(big);

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??? CCSprite *little = CCSprite::create();

??? little->setColor(ccYELLOW);

??? little->setAnchorPoint(ccp(0,0));

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

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

??? //從下面可以知道一個精靈中可以添加另外一個精靈

??? big->addChild(little);

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??? 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);

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??? 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);

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??? 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);

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

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

??? //最后一個NULL是一個哨兵

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

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

???

??? //第一個參數是：duration

??? //第二個參數是：移動位置.表示上下移動

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

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

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

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

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??? return true;

}

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//觸摸事件開始

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

{

??? CCLog("ccTouchBegan");

??? //基于OpenGL的世界坐標

??? CCPoint pGl = pTouch->getLocation();

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

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??? //基于UI屏幕的坐標

??? CCPoint pUi = pTouch->getLocationInView();

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

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??? //將基于GL的坐標轉換成為UI的屏幕坐標

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

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

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??? //將屏幕坐標的轉換成為本地坐標

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

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

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??? //轉換成節點坐標

??? CCPoint node = this->convertToNodeSpace(pGl);

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

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??? return false;

}

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