CCDirector->convertToGL()　　//将屏幕坐标系转换为GL坐标系CCDirector->convertToUI()　　//将GL坐标系转换为屏幕坐标系

CCPoint convertToNodeSpace(const CCPoint& worldPoint);   //将orignPosition转换为相对于spriteParent的本地坐标
CCPoint convertToWorldSpace(const CCPoint& nodePoint);   //将orignPosition转换为相对于spriteParent的世界坐标
CCPoint convertToNodeSpaceAR(const CCPoint& worldPoint); //将spriteParent的坐标系原点设置在spriteParent的锚点位置,然后orignPosition转换为相对于spriteParent的本地坐标
CCPoint convertToWorldSpaceAR(const CCPoint& nodePoint); //将spriteParent的坐标系原点设置在spriteParent的锚点位置,然后orignPosition转换为相对于spriteParent的世界坐标

CCSprite *sprite1 = CCSprite::spriteWithFile("CloseNormal.png");
sprite1->setPosition(ccp(20,40));
sprite1->setAnchorPoint(ccp(0,0));
this->addChild(sprite1);
CCSprite *sprite2 = CCSprite::spriteWithFile("CloseNormal.png");
sprite2->setPosition(ccp(-5,-20));
sprite2->setAnchorPoint(ccp(1,1));
this->addChild(sprite2);
CCPoint point1 = sprite1->convertToNodeSpace(sprite2->getPosition());
CCPoint point2 = sprite1->convertToWorldSpace(sprite2->getPosition());
CCPoint point3 = sprite1->convertToNodeSpaceAR(sprite2->getPosition());
CCPoint point4 = sprite1->convertToWorldSpaceAR(sprite2->getPosition());
CCLog("position = (%f,%f)",point1.x,point1.y);
CCLog("position = (%f,%f)",point2.x,point2.y);
CCLog("position = (%f,%f)",point3.x,point3.y);
CCLog("position = (%f,%f)",point4.x,point4.y);

运行结果：

position = (-25.000000,-60.000000)
position = (15.000000,20.000000)
position = (-25.000000,-60.000000)
position = (15.000000,20.000000)

和预期的一样，这里在将sprite1的锚点设置成（0.5,0.5),对convertToNodeSpaceAR和convertToWorldSpaceAR进行了进一步的测试

sprite1->setAnchorPoint(ccp(0.5,0.5));
sprite1->setPosition(ccp(100,100));
CCPoint point5 = sprite1->convertToNodeSpaceAR(sprite2->getPosition());
CCPoint point6 = sprite1->convertToWorldSpaceAR(sprite2->getPosition());
CCLog("position = (%f,%f)",point5.x,point5.y);
CCLog("position = (%f,%f)",point6.x,point5.y);

运算结果：

size = (40.000000,40.000000)
position = (-105.000000,-120.000000)
position = (95.000000,80.000000)

分析：重置的sprite1的坐标为(100,100），锚点为（0.5,0.5)所以对于convertToNodeSpaceAR和convertToWorldSpaceAR这两个方法的坐标系为原点(100,100),所以用convertToNodeSpaceAR转化之后的坐标为（-105,-120）用convertToWorldSpaceAR化之后的坐标为（95,80），和运算结果一样。

convertToNodeSpace：调用CCPoint point = node1->convertToNodeSpace(node2->getPosition());

将node2的坐标转化成相对于node1的本地坐标

比如坐标如上图所示，node1的锚点为（0,0），node2的锚点为（1,1），转化之后，node2的坐标变成了（-25，-60），即相对于node1的锚点的偏移。

而convertToWorldSpace：调用CCPoint point = node1->convertToWorldSpace(node2->getPosition());