复习Core Graphics-2

1.CGRectInfinite poisition 看作在负无穷处，整个矩形无穷大 CGRectNull, position看作在正无穷处，矩形面积为0，和CGRectNull union 返回原矩形

2.CGPointCreateDictionaryRepresentation CGPointMakeWithDictionaryRepresentation ， CGSize, CGRect 同

3.CGRectIsEmpty() CGRectIsNull()  CGRectIsInfinite()  CGAffineTransformIsIdentity() 

4.CGPointEqualToPoint(p1,p2) ,  CGSize,CGRect,CGAffinieTransformEqualToTransform 同

5.CGRectContainsPoint(rect,point) CGRectContainsRect(rect,rect) CGRectIntersectsRect(r1,r2)

6.CGRectInset,offset,GetMidX,Union,Intersection,Integral,Standardize,Divide

7.CGRectDivide(rect,&sliceRect,&remainRect,amount,edge); CGRectMinXEdge,CGRectMinYEdge,CGRectMaxXEdge,CGRectMaxYEdge