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greg |
1.1 |
#ifndef lint |
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greg |
2.6 |
static const char RCSid[] = "$Id: xf.c,v 2.5 2003/02/25 02:47:22 greg Exp $"; |
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1.1 |
#endif |
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/* |
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* xf.c - routines to convert transform arguments into 4X4 matrix. |
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* |
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greg |
2.6 |
* External symbols declared in rtmath.h |
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2.4 |
*/ |
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2.6 |
#include "rtmath.h" |
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#include "rtio.h" |
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1.1 |
|
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1.6 |
#define d2r(a) ((PI/180.)*(a)) |
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1.1 |
|
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1.12 |
#define checkarg(a,l) if (av[i][a] || badarg(ac-i-1,av+i+1,l)) goto done |
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1.1 |
|
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1.2 |
|
18 |
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1.1 |
int |
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1.9 |
xf(ret, ac, av) /* get transform specification */ |
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register XF *ret; |
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greg |
1.1 |
int ac; |
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char *av[]; |
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{ |
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1.11 |
MAT4 xfmat, m4; |
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1.7 |
double xfsca, dtmp; |
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1.5 |
int i, icnt; |
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1.1 |
|
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1.9 |
setident4(ret->xfm); |
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ret->sca = 1.0; |
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1.4 |
|
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1.8 |
icnt = 1; |
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1.4 |
setident4(xfmat); |
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xfsca = 1.0; |
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greg |
1.1 |
for (i = 0; i < ac && av[i][0] == '-'; i++) { |
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setident4(m4); |
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switch (av[i][1]) { |
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case 't': /* translate */ |
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greg |
1.12 |
checkarg(2,"fff"); |
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1.1 |
m4[3][0] = atof(av[++i]); |
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m4[3][1] = atof(av[++i]); |
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m4[3][2] = atof(av[++i]); |
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break; |
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case 'r': /* rotate */ |
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switch (av[i][2]) { |
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case 'x': |
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1.12 |
checkarg(3,"f"); |
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1.7 |
dtmp = d2r(atof(av[++i])); |
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m4[1][1] = m4[2][2] = cos(dtmp); |
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m4[2][1] = -(m4[1][2] = sin(dtmp)); |
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1.1 |
break; |
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case 'y': |
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1.12 |
checkarg(3,"f"); |
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1.7 |
dtmp = d2r(atof(av[++i])); |
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m4[0][0] = m4[2][2] = cos(dtmp); |
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m4[0][2] = -(m4[2][0] = sin(dtmp)); |
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1.1 |
break; |
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case 'z': |
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1.12 |
checkarg(3,"f"); |
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1.7 |
dtmp = d2r(atof(av[++i])); |
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m4[0][0] = m4[1][1] = cos(dtmp); |
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m4[1][0] = -(m4[0][1] = sin(dtmp)); |
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1.1 |
break; |
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default: |
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2.3 |
goto done; |
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1.1 |
} |
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break; |
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case 's': /* scale */ |
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1.12 |
checkarg(2,"f"); |
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1.7 |
dtmp = atof(av[i+1]); |
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if (dtmp == 0.0) goto done; |
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i++; |
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1.4 |
xfsca *= |
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1.1 |
m4[0][0] = |
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m4[1][1] = |
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1.7 |
m4[2][2] = dtmp; |
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1.1 |
break; |
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case 'm': /* mirror */ |
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switch (av[i][2]) { |
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case 'x': |
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1.12 |
checkarg(3,""); |
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1.4 |
xfsca *= |
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1.1 |
m4[0][0] = -1.0; |
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break; |
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case 'y': |
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greg |
1.12 |
checkarg(3,""); |
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1.4 |
xfsca *= |
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1.1 |
m4[1][1] = -1.0; |
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break; |
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case 'z': |
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greg |
1.12 |
checkarg(3,""); |
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1.4 |
xfsca *= |
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1.1 |
m4[2][2] = -1.0; |
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break; |
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default: |
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greg |
2.3 |
goto done; |
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greg |
1.1 |
} |
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break; |
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1.4 |
case 'i': /* iterate */ |
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1.12 |
checkarg(2,"i"); |
108 |
greg |
1.5 |
while (icnt-- > 0) { |
109 |
greg |
1.9 |
multmat4(ret->xfm, ret->xfm, xfmat); |
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ret->sca *= xfsca; |
111 |
greg |
1.4 |
} |
112 |
greg |
1.8 |
icnt = atoi(av[++i]); |
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greg |
1.4 |
setident4(xfmat); |
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xfsca = 1.0; |
115 |
greg |
1.8 |
continue; |
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greg |
1.4 |
|
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greg |
1.1 |
default: |
118 |
greg |
2.3 |
goto done; |
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greg |
1.1 |
|
120 |
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} |
121 |
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multmat4(xfmat, xfmat, m4); |
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} |
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greg |
1.4 |
done: |
124 |
greg |
1.8 |
while (icnt-- > 0) { |
125 |
greg |
1.9 |
multmat4(ret->xfm, ret->xfm, xfmat); |
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ret->sca *= xfsca; |
127 |
greg |
1.8 |
} |
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greg |
1.1 |
return(i); |
129 |
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} |
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132 |
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int |
133 |
greg |
1.9 |
invxf(ret, ac, av) /* invert transform specification */ |
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register XF *ret; |
135 |
greg |
1.1 |
int ac; |
136 |
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char *av[]; |
137 |
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{ |
138 |
greg |
1.11 |
MAT4 xfmat, m4; |
139 |
greg |
1.7 |
double xfsca, dtmp; |
140 |
greg |
1.5 |
int i, icnt; |
141 |
greg |
1.1 |
|
142 |
greg |
1.9 |
setident4(ret->xfm); |
143 |
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ret->sca = 1.0; |
144 |
greg |
1.4 |
|
145 |
greg |
1.8 |
icnt = 1; |
146 |
greg |
1.4 |
setident4(xfmat); |
147 |
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xfsca = 1.0; |
148 |
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|
149 |
greg |
1.1 |
for (i = 0; i < ac && av[i][0] == '-'; i++) { |
150 |
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151 |
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setident4(m4); |
152 |
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153 |
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switch (av[i][1]) { |
154 |
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155 |
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case 't': /* translate */ |
156 |
greg |
1.12 |
checkarg(2,"fff"); |
157 |
greg |
1.1 |
m4[3][0] = -atof(av[++i]); |
158 |
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m4[3][1] = -atof(av[++i]); |
159 |
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m4[3][2] = -atof(av[++i]); |
160 |
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break; |
161 |
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162 |
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case 'r': /* rotate */ |
163 |
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switch (av[i][2]) { |
164 |
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case 'x': |
165 |
greg |
1.12 |
checkarg(3,"f"); |
166 |
greg |
1.7 |
dtmp = -d2r(atof(av[++i])); |
167 |
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m4[1][1] = m4[2][2] = cos(dtmp); |
168 |
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m4[2][1] = -(m4[1][2] = sin(dtmp)); |
169 |
greg |
1.1 |
break; |
170 |
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case 'y': |
171 |
greg |
1.12 |
checkarg(3,"f"); |
172 |
greg |
1.7 |
dtmp = -d2r(atof(av[++i])); |
173 |
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m4[0][0] = m4[2][2] = cos(dtmp); |
174 |
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m4[0][2] = -(m4[2][0] = sin(dtmp)); |
175 |
greg |
1.1 |
break; |
176 |
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case 'z': |
177 |
greg |
1.12 |
checkarg(3,"f"); |
178 |
greg |
1.7 |
dtmp = -d2r(atof(av[++i])); |
179 |
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m4[0][0] = m4[1][1] = cos(dtmp); |
180 |
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m4[1][0] = -(m4[0][1] = sin(dtmp)); |
181 |
greg |
1.1 |
break; |
182 |
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default: |
183 |
greg |
2.3 |
goto done; |
184 |
greg |
1.1 |
} |
185 |
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break; |
186 |
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187 |
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case 's': /* scale */ |
188 |
greg |
1.12 |
checkarg(2,"f"); |
189 |
greg |
1.7 |
dtmp = atof(av[i+1]); |
190 |
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if (dtmp == 0.0) goto done; |
191 |
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i++; |
192 |
greg |
1.5 |
xfsca *= |
193 |
greg |
1.1 |
m4[0][0] = |
194 |
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m4[1][1] = |
195 |
greg |
1.7 |
m4[2][2] = 1.0 / dtmp; |
196 |
greg |
1.1 |
break; |
197 |
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198 |
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case 'm': /* mirror */ |
199 |
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switch (av[i][2]) { |
200 |
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case 'x': |
201 |
greg |
1.12 |
checkarg(3,""); |
202 |
greg |
1.5 |
xfsca *= |
203 |
greg |
1.1 |
m4[0][0] = -1.0; |
204 |
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break; |
205 |
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case 'y': |
206 |
greg |
1.12 |
checkarg(3,""); |
207 |
greg |
1.5 |
xfsca *= |
208 |
greg |
1.1 |
m4[1][1] = -1.0; |
209 |
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break; |
210 |
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case 'z': |
211 |
greg |
1.12 |
checkarg(3,""); |
212 |
greg |
1.5 |
xfsca *= |
213 |
greg |
1.1 |
m4[2][2] = -1.0; |
214 |
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break; |
215 |
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default: |
216 |
greg |
2.3 |
goto done; |
217 |
greg |
1.1 |
} |
218 |
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break; |
219 |
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|
220 |
greg |
1.4 |
case 'i': /* iterate */ |
221 |
greg |
1.12 |
checkarg(2,"i"); |
222 |
greg |
1.5 |
while (icnt-- > 0) { |
223 |
greg |
1.9 |
multmat4(ret->xfm, xfmat, ret->xfm); |
224 |
|
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ret->sca *= xfsca; |
225 |
greg |
1.4 |
} |
226 |
greg |
1.8 |
icnt = atoi(av[++i]); |
227 |
greg |
1.4 |
setident4(xfmat); |
228 |
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xfsca = 1.0; |
229 |
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break; |
230 |
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|
231 |
greg |
1.1 |
default: |
232 |
greg |
2.3 |
goto done; |
233 |
greg |
1.1 |
|
234 |
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} |
235 |
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multmat4(xfmat, m4, xfmat); /* left multiply */ |
236 |
greg |
1.4 |
} |
237 |
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done: |
238 |
greg |
1.8 |
while (icnt-- > 0) { |
239 |
greg |
1.9 |
multmat4(ret->xfm, xfmat, ret->xfm); |
240 |
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ret->sca *= xfsca; |
241 |
greg |
1.8 |
} |
242 |
greg |
1.1 |
return(i); |
243 |
greg |
1.9 |
} |
244 |
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245 |
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246 |
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int |
247 |
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fullxf(fx, ac, av) /* compute both forward and inverse */ |
248 |
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FULLXF *fx; |
249 |
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int ac; |
250 |
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char *av[]; |
251 |
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{ |
252 |
|
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xf(&fx->f, ac, av); |
253 |
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return(invxf(&fx->b, ac, av)); |
254 |
greg |
1.1 |
} |