CGAffineTransform的使用

typedef struct CGAffineTransform CGAffineTransform;

struct CGAffineTransform {

  CGFloat a, b, c, d;

  CGFloat tx, ty;

};

 const CGAffineTransform CGAffineTransformIdentity；

 

CGAffineTransform CGAffineTransformMake(CGFloat a, CGFloat b,

  CGFloat c, CGFloat d, CGFloat tx, CGFloat ty)；

 

CGAffineTransform CGAffineTransformMakeTranslation(CGFloat tx,

  CGFloat ty) ;

//大小变化

CGAffineTransform CGAffineTransformMakeScale(CGFloat sx, CGFloat sy)；

//旋转

CGAffineTransform CGAffineTransformMakeRotation(CGFloat angle)；

 

bool CGAffineTransformIsIdentity(CGAffineTransform t)；

 

CGAffineTransform CGAffineTransformTranslate(CGAffineTransform t,

  CGFloat tx, CGFloat ty)；

//在t的基础上放大变化

CGAffineTransform CGAffineTransformScale(CGAffineTransform t,

  CGFloat sx, CGFloat sy) ；

 

CGAffineTransform CGAffineTransformInvert(CGAffineTransform t)；

 

CGAffineTransform CGAffineTransformConcat(CGAffineTransform t1,

  CGAffineTransform t2)；

 

bool CGAffineTransformEqualToTransform(CGAffineTransform t1,

  CGAffineTransform t2)；

 

CGPoint CGPointApplyAffineTransform(CGPoint point,

  CGAffineTransform t)；

 

GSize CGSizeApplyAffineTransform(CGSize size, CGAffineTransform t)；

 

CGRect CGRectApplyAffineTransform(CGRect rect, CGAffineTransform t)；