问题
I've recently come across Pixel-Perfect collision between two sprites from this link: http://www.cocos2d-iphone.org/forum/topic/18522.
I'm just wondering if its possible to implement this using 1 sprite and CGPoint(touch). If this is, can anybody explain how to implement it that way? Thank you
来源：https://stackoverflow.com/questions/14699400/pixel-perfect-collision-for-ignoring-transparent-areas-of-sprites