仿射變換(CGAffineTransform)使用小結

一、理論基礎

請參考CGAffineTransform簡單分析

二、效果演示

三、實現代碼

3.1：位移變換

-(void)positionAnimation{ _demoView.transform = CGAffineTransformIdentity; [UIView animateWithDuration:1.0f animations:^{ _demoView.transform = CGAffineTransformMakeTranslation(100, 100); }]; }

3.2：縮放變換

-(void)scaleAnimation{ _demoView.transform = CGAffineTransformIdentity; [UIView animateWithDuration:1.0f animations:^{ _demoView.transform = CGAffineTransformMakeScale(2, 2); }]; }

3.3：旋轉變換

-(void)rotateAnimation{ _demoView.transform = CGAffineTransformIdentity; [UIView animateWithDuration:1.0f animations:^{ _demoView.transform = CGAffineTransformMakeRotation(M_PI); }]; }

3.4：組合變換

-(void)combinationAnimation{
    //仿射變換的組合使用 _demoView.transform = CGAffineTransformIdentity; [UIView animateWithDuration:1.0f animations:^{ CGAffineTransform transform1 = CGAffineTransformMakeRotation(M_PI); CGAffineTransform transform2 = CGAffineTransformScale(transform1, 0.5, 0.5); _demoView.transform = CGAffineTransformTranslate(transform2, 100, 100); }]; }

 

3.5：矩陣的反轉

-(void)invertAnimation{
    _demoView.transform = CGAffineTransformIdentity; [UIView animateWithDuration:1.0f animations:^{ //矩陣反轉 _demoView.transform = CGAffineTransformInvert(CGAffineTransformMakeScale(2, 2)); }]; }

 

 

四、補充

• CGAffineTransformIdentity ： 單位矩陣變換，一般用於仿射變換的初始化或者還原。

• CGAffineTransformEqualToTransform(CGAffineTransform t1, 
  CGAffineTransform t2) ： 判斷兩個變換矩陣是否相等

• CGAffineTransformConcat(CGAffineTransform t1, 
  CGAffineTransform t2) ： 得到兩個矩陣相加后得到的最終矩陣

• CGPoint CGPointApplyAffineTransform(CGPoint point, 
  CGAffineTransform t) ： 某點通過矩陣變換之后的點

• CGSize CGSizeApplyAffineTransform(CGSize size, CGAffineTransform t) ： 某個size通過矩陣變換之后的size

• CGRect CGRectApplyAffineTransform(CGRect rect, CGAffineTransform t) ： 某個Rect通過矩陣變換之后的區域

五、Demo下載地址

github下載地址 

 

轉自：http://blog.csdn.net/yixiangboy