cocos2d-x——坐标系统

#include "HelloWorldScene.h"

using namespace cocos2d;

CCScene* HelloWorld::scene()
{
    CCScene * scene = NULL;
    do 
    {
        // 'scene' is an autorelease object
        scene = CCScene::node();
        CC_BREAK_IF(! scene);

        // 'layer' is an autorelease object
        HelloWorld *layer = HelloWorld::node();
        CC_BREAK_IF(! layer);

        // add layer as a child to scene
        scene->addChild(layer);
    } while (0);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    bool bRet = false;
    do 
    {
        //////////////////////////////////////////////////////////////////////////
        // super init first
        //////////////////////////////////////////////////////////////////////////

        CC_BREAK_IF(! CCLayer::init());

        //////////////////////////////////////////////////////////////////////////
        // add your codes below...
        //////////////////////////////////////////////////////////////////////////
        
		/*
		颜色涂层
		*/
		CCLayerColor* colorLayer = CCLayerColor::layerWithColor(ccc4f(255,255,0,255));
		//this->addChild(colorLayer);


		/*
		渐变色图层
		CCLayerGradient::layerWithColor(ccc4f(255,0,0,255),ccc4f(0,255,0,255),ccp(0.8,0.8))
		3个参数分别为：开始颜色、结束颜色、颜色改变的点
		需要注意的是颜色改变的点的两个参数都以比例的形式给出。

		如这里的ccp(0.8,0.8)中的0.8是指占x轴的0.8
		*/
		CCLayerGradient* gradientLayer = CCLayerGradient::layerWithColor(ccc4f(255,0,0,255),ccc4f(0,255,0,255),ccp(0.8,0.8));
		//this->addChild(gradientLayer);

		//CCLayerMultiplex* grounLayer = CCLayerMultiplex::layerWithLayers(colorLayer,gradientLayer);
		//this->addChild(grounLayer);
		//grounLayer->switchTo(1);//切换到索引为1的图层。(索引从0开始算)
		//grounLayer->switchToAndReleaseMe(1);//与上一个的不同之处在于这个切换后会释放该图层的空间,而且可能会产生异常

		/*
		CCLog():用于向控制台打印日志
		this->getAnchorPoint() :获取当前图层或精灵的锚点
		
		结论：图层或精灵（其他的也是这样，例如什么CCLayer）的默认锚点都是0.5、0.5
		*/
		//CCSprite* sprite = CCSprite::spriteWithFile("CloseNormal.png");
		//CCLog("layer:(%f , %f)",this->getAnchorPoint().x,this->getAnchorPoint().y);
		//CCLog("sprite:(%f , %f)",sprite->getAnchorPoint().x,this->getAnchorPoint().y);


		CCLayerColor* colorLayer1 = CCLayerColor::layerWithColorWidthHeight(ccc4f(255,0,0,255),480,320);
		this->addChild(colorLayer1);
		CCLog("colorLayer = (%f , %f)",colorLayer1->getAnchorPoint().x,colorLayer1->getAnchorPoint().y);
		colorLayer1->setPosition(ccp(240,160));//这两行的意思是：采用锚点作为作用点，将作用点的位置设为100,100
		colorLayer1->setIsRelativeAnchorPoint(true);//如果不加这一行,那么意思就变成了“将当前作用点的位置设为100,100（默认是左下角）”
		colorLayer1->setAnchorPoint(ccp(0,0));//加上这一句话后,这三句话的意思就变成了：将锚点的坐标设为0,0；采用锚点作为作用点；将锚点移至240,160

        bRet = true;
    } while (0);

    return bRet;
}

void HelloWorld::menuCloseCallback(CCObject* pSender)
{
    // "close" menu item clicked
    CCDirector::sharedDirector()->end();
}