1  /* Copyright (c) 2006-2007 Christopher J. W. Lloyd
 2  
 3  Permission is hereby granted, free of charge, to any person obtaining a copy of
 4  this software and associated documentation files (the "Software"), to deal in
 5  the Software without restriction, including without limitation the rights to
 6  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 7  the Software, and to permit persons to whom the Software is furnished to do so,
 8  subject to the following conditions:
 9  
10  The above copyright notice and this permission notice shall be included in all
11  copies or substantial portions of the Software.
12  
13  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
15  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
16  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
17  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
18  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
19  
20  #import <CoreGraphics/CGGeometry.h>
21  #import <CoreGraphics/CoreGraphicsExport.h>
22  
23  typedef struct {
24      CGFloat a;
25      CGFloat b;
26      CGFloat c;
27      CGFloat d;
28      CGFloat tx;
29      CGFloat ty;
30  } CGAffineTransform;
31  
32  COREGRAPHICS_EXPORT const CGAffineTransform CGAffineTransformIdentity;
33  
34  COREGRAPHICS_EXPORT bool CGAffineTransformIsIdentity(CGAffineTransform xform);
35  
36  static CGAffineTransform __CGAffineTransformMake(CGFloat a, CGFloat b, CGFloat c,
37                                          CGFloat d, CGFloat tx, CGFloat ty)
38  {
39      CGAffineTransform xform = {a, b, c, d, tx, ty};
40      return xform;
41  }
42  #define CGAffineTransformMake __CGAffineTransformMake
43  
44  COREGRAPHICS_EXPORT CGAffineTransform
45  CGAffineTransformMakeRotation(CGFloat radians);
46  COREGRAPHICS_EXPORT CGAffineTransform
47  CGAffineTransformMakeScale(CGFloat scalex, CGFloat scaley);
48  COREGRAPHICS_EXPORT CGAffineTransform
49  CGAffineTransformMakeTranslation(CGFloat tx, CGFloat ty);
50  
51  COREGRAPHICS_EXPORT CGAffineTransform
52  CGAffineTransformConcat(CGAffineTransform xform, CGAffineTransform append);
53  COREGRAPHICS_EXPORT CGAffineTransform
54  CGAffineTransformInvert(CGAffineTransform xform);
55  
56  COREGRAPHICS_EXPORT CGAffineTransform
57  CGAffineTransformRotate(CGAffineTransform xform, CGFloat radians);
58  COREGRAPHICS_EXPORT CGAffineTransform
59  CGAffineTransformScale(CGAffineTransform xform, CGFloat scalex, CGFloat scaley);
60  COREGRAPHICS_EXPORT CGAffineTransform
61  CGAffineTransformTranslate(CGAffineTransform xform, CGFloat tx, CGFloat ty);
62  
63  static CGPoint __CGPointApplyAffineTransform(CGPoint point, CGAffineTransform xform) {
64      CGPoint p;
65  
66      p.x = xform.a * point.x + xform.c * point.y + xform.tx;
67      p.y = xform.b * point.x + xform.d * point.y + xform.ty;
68  
69      return p;
70  }
71  #define CGPointApplyAffineTransform __CGPointApplyAffineTransform
72  
73  static CGSize __CGSizeApplyAffineTransform(CGSize size, CGAffineTransform xform) {
74      CGSize s;
75  
76      s.width = xform.a * size.width + xform.c * size.height;
77      s.height = xform.b * size.width + xform.d * size.height;
78  
79      return s;
80  }
81  #define CGSizeApplyAffineTransform __CGSizeApplyAffineTransform
82  
83  COREGRAPHICS_EXPORT CGRect CGRectApplyAffineTransform(CGRect rect,
84                                                        CGAffineTransform t);