用构造函数来直接创建一个CCRect对象
class CC_DLL CCRect
{
public:
CCPoint origin;
CCSize size;
public:
CCRect();
CCRect(float x, float y, float width, float height);
};
#define CCRectMake(x, y, width, height) CCRect((float)(x), (float)(y), (float)(width), (float)(height))
