1 /****************************************************************************\
2 Part of the XeTeX typesetting system
3 Copyright (c) 1994-2008 by SIL International
4 Copyright (c) 2009 by Jonathan Kew
5
6 SIL Author(s): Jonathan Kew
7
8 Permission is hereby granted, free of charge, to any person obtaining
9 a copy of this software and associated documentation files (the
10 "Software"), to deal in the Software without restriction, including
11 without limitation the rights to use, copy, modify, merge, publish,
12 distribute, sublicense, and/or sell copies of the Software, and to
13 permit persons to whom the Software is furnished to do so, subject to
14 the following conditions:
15
16 The above copyright notice and this permission notice shall be
17 included in all copies or substantial portions of the Software.
18
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE
23 FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
24 CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26
27 Except as contained in this notice, the name of the copyright holders
28 shall not be used in advertising or otherwise to promote the sale,
29 use or other dealings in this Software without prior written
30 authorization from the copyright holders.
31 \****************************************************************************/
32
33 #include "trans.h"
34
makeidentity(transform * t)35 void makeidentity(transform* t)
36 {
37 t->a = 1.0;
38 t->b = 0.0;
39 t->c = 0.0;
40 t->d = 1.0;
41 t->x = 0.0;
42 t->y = 0.0;
43 }
44
makescale(transform * t,double xscale,double yscale)45 void makescale(transform* t, double xscale, double yscale)
46 {
47 t->a = xscale;
48 t->b = 0.0;
49 t->c = 0.0;
50 t->d = yscale;
51 t->x = 0.0;
52 t->y = 0.0;
53 }
54
maketranslation(transform * t,double dx,double dy)55 void maketranslation(transform* t, double dx, double dy)
56 {
57 t->a = 1.0;
58 t->b = 0.0;
59 t->c = 0.0;
60 t->d = 1.0;
61 t->x = dx;
62 t->y = dy;
63 }
64 #include <stdio.h>
makerotation(transform * t,double a)65 void makerotation(transform* t, double a)
66 {
67 t->a = cos(a);
68 t->b = sin(a);
69 t->c = -sin(a);
70 t->d = cos(a);
71 t->x = 0.0;
72 t->y = 0.0;
73 }
74
transformpoint(realpoint * p,const transform * t)75 void transformpoint(realpoint* p, const transform* t)
76 {
77 realpoint r;
78 r.x = t->a * p->x + t->c * p->y + t->x;
79 r.y = t->b * p->x + t->d * p->y + t->y;
80 *p = r;
81 }
82
transformconcat(transform * t1,const transform * t2)83 void transformconcat(transform* t1, const transform* t2)
84 {
85 transform r;
86 r.a = t1->a * t2->a + t1->b * t2->c + 0.0 * t2->x;
87 r.b = t1->a * t2->b + t1->b * t2->d + 0.0 * t2->y;
88 r.c = t1->c * t2->a + t1->d * t2->c + 0.0 * t2->x;
89 r.d = t1->c * t2->b + t1->d * t2->d + 0.0 * t2->y;
90 r.x = t1->x * t2->a + t1->y * t2->c + 1.0 * t2->x;
91 r.y = t1->x * t2->b + t1->y * t2->d + 1.0 * t2->y;
92 *t1 = r;
93 }
94