Add some helper methods Clamp and IsNear to CCPoint.
Add some helper methods Clamp and IsNear to CCPoint.

TukekeSoft/CocosSharp,netonjm/CocosSharp,hig-ag/CocosSharp,haithemaraissia/CocosSharp,TukekeSoft/CocosSharp,zmaruo/CocosSharp,MSylvia/CocosSharp,MSylvia/CocosSharp,hig-ag/CocosSharp,zmaruo/CocosSharp,mono/CocosSharp,mono/CocosSharp,netonjm/CocosSharp,haithemaraissia/CocosSharp