File: transform.cc

package info (click to toggle)
nam 1.15-5
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 29,240 kB
  • sloc: cpp: 17,338; tcl: 10,655; sh: 2,997; ansic: 1,252; makefile: 139; perl: 66
file content (276 lines) | stat: -rw-r--r-- 7,101 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/*
 * Copyright (c) 1993 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This code derived from InterViews library which is covered
 * by the copyright below.
 */
/*
 * Copyright (c) 1987, 1988, 1989, 1990, 1991 Stanford University
 * Copyright (c) 1991 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Stanford and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Stanford and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 *
 * IN NO EVENT SHALL STANFORD OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * Implementation of transformation matrix operations.
 */

#include "sincos.h"
#include "transform.h"

static const double RADPERDEG = M_PI/180.0;

Transform::Transform()
{
	clear();
}

void Transform::clear()
{
	identity_ = 1;
	mat00 = mat11 = 1;
	mat01 = mat10 = mat20 = mat21 = 0;
}

Transform::Transform(const Transform& t)
{
	mat00 = t.mat00;	mat01 = t.mat01;
	mat10 = t.mat10;	mat11 = t.mat11;
	mat20 = t.mat20;	mat21 = t.mat21;
	update();
}

Transform::Transform(float a00, float a01, float a10,
		     float a11, float a20, float a21)
{
	mat00 = a00;	mat01 = a01;
	mat10 = a10;	mat11 = a11;
	mat20 = a20;	mat21 = a21;
	update();
}

int Transform::operator ==(const Transform& t) const
{
	if (identity_)
		return t.identity_;

	if (t.identity_)
		return (0);

	return (mat00 == t.mat00 && mat01 == t.mat01 &&
		mat10 == t.mat10 && mat11 == t.mat11 &&
		mat20 == t.mat20 && mat21 == t.mat21);
}

int Transform::operator !=(const Transform& t) const
{
	if (identity_)
		return (!t.identity_);

	if (t.identity_)
		return (1);

	return (mat00 != t.mat00 || mat01 != t.mat01 ||
		mat10 != t.mat10 || mat11 != t.mat11 ||
		mat20 != t.mat20 || mat21 != t.mat21);
}

Transform& Transform::operator =(const Transform& t)
{
	mat00 = t.mat00;
	mat01 = t.mat01;
	mat10 = t.mat10;
	mat11 = t.mat11;
	mat20 = t.mat20;
	mat21 = t.mat21;
	update();
	return (*this);
}

void Transform::update()
{
	identity_ = (
		     mat00 == 1 && mat11 == 1 &&
		     mat01 == 0 && mat10 == 0 && mat20 == 0 && mat21 == 0
		     );
}

void Transform::translate(float dx, float dy)
{
	mat20 += dx;
	mat21 += dy;
	update();
}

void Transform::scale(float sx, float sy)
{
	mat00 *= sx;
	mat01 *= sy;
	mat10 *= sx;
	mat11 *= sy;
	mat20 *= sx;
	mat21 *= sy;
	update();
}

void Transform::skew(float sx, float sy)
{
	mat01 += mat00*sy;
	mat10 += mat11*sx;
    update();
}

void Transform::rotate(float angle)
{
	float tmp1, tmp2, m00, m01, m10, m11, m20, m21;

	angle *= RADPERDEG;
	tmp1 = cos(angle);
	tmp2 = sin(angle);
    
	m00 = mat00*tmp1;
	m01 = mat01*tmp2;
	m10 = mat10*tmp1;
	m11 = mat11*tmp2;
	m20 = mat20*tmp1;
	m21 = mat21*tmp2;

	mat01 = mat00*tmp2 + mat01*tmp1;
	mat11 = mat10*tmp2 + mat11*tmp1;
	mat21 = mat20*tmp2 + mat21*tmp1;
	mat00 = m00 - m01;
	mat10 = m10 - m11;
	mat20 = m20 - m21;
	update();
}

void Transform::premultiply(const Transform& t)
{
	float tmp1 = mat00;
	float tmp2 = mat10;
	
	mat00  = t.mat00*tmp1 + t.mat01*tmp2;
	mat10  = t.mat10*tmp1 + t.mat11*tmp2;
	mat20 += t.mat20*tmp1 + t.mat21*tmp2;
	
	tmp1 = mat01;
	tmp2 = mat11;
	
	mat01  = t.mat00*tmp1 + t.mat01*tmp2;
	mat11  = t.mat10*tmp1 + t.mat11*tmp2;
	mat21 += t.mat20*tmp1 + t.mat21*tmp2;
	update();
}

void Transform::postmultiply(const Transform& t)
{
	float tmp = mat00*t.mat01 + mat01*t.mat11;
	mat00 = mat00*t.mat00 + mat01*t.mat10;
	mat01 = tmp;
	
	tmp = mat10*t.mat01 + mat11*t.mat11;
	mat10 = mat10*t.mat00 + mat11*t.mat10;
	mat11 = tmp;
	
	tmp = mat20*t.mat01 + mat21*t.mat11;
	mat20 = mat20*t.mat00 + mat21*t.mat10;
	mat21 = tmp;
	
	mat20 += t.mat20;
	mat21 += t.mat21;
	update();
}    

void Transform::invert()
{
	float d = det();
	float t00 = mat00;
	float t20 = mat20;
	
	mat20 = (mat10*mat21 - mat11*mat20)/d;
	mat21 = (mat01*t20 - mat00*mat21)/d;
	mat00 = mat11/d;
	mat11 = t00/d;
	mat10 = -mat10/d;
	mat01 = -mat01/d;
	update();
}

void Transform::map(float& x, float& y) const
{
	float tx = x;
	x = tx*mat00 + y*mat10 + mat20;
	y = tx*mat01 + y*mat11 + mat21;
}

void Transform::map(float x, float y, float& tx, float& ty) const
{
	tx = x*mat00 + y*mat10 + mat20;
	ty = x*mat01 + y*mat11 + mat21;
}

void Transform::imap(float& tx, float& ty) const
{
	float d = det();
	float a = (tx - mat20) / d;
	float b = (ty - mat21) / d;
	
	tx = a*mat11 - b*mat10;
	ty = b*mat00 - a*mat01;
}

void Transform::imap(float tx, float ty, float& x, float& y) const
{
	float d = det();
	float a = (tx - mat20) / d;
	float b = (ty - mat21) / d;
	
	x = a*mat11 - b*mat10;
	y = b*mat00 - a*mat01;
}