1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: image.c,v 2.30 2005/02/07 20:13:55 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* image.c - routines for image generation. |
6 |
* |
7 |
* External symbols declared in view.h |
8 |
*/ |
9 |
|
10 |
#include "copyright.h" |
11 |
|
12 |
#include "rtio.h" |
13 |
#include "rtmath.h" |
14 |
#include "paths.h" |
15 |
#include "view.h" |
16 |
|
17 |
|
18 |
#define FEQ(x,y) (fabs((x)-(y)) <= FTINY) |
19 |
#define VEQ(v,w) (FEQ((v)[0],(w)[0]) && FEQ((v)[1],(w)[1]) \ |
20 |
&& FEQ((v)[2],(w)[2])) |
21 |
|
22 |
VIEW stdview = STDVIEW; /* default view parameters */ |
23 |
|
24 |
static gethfunc gethview; |
25 |
|
26 |
|
27 |
char * |
28 |
setview(v) /* set hvec and vvec, return message on error */ |
29 |
register VIEW *v; |
30 |
{ |
31 |
static char ill_horiz[] = "illegal horizontal view size"; |
32 |
static char ill_vert[] = "illegal vertical view size"; |
33 |
|
34 |
if (v->vaft < -FTINY || (v->vaft > FTINY && v->vaft <= v->vfore)) |
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return("illegal fore/aft clipping plane"); |
36 |
|
37 |
if (v->vdist <= FTINY) |
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return("illegal view distance"); |
39 |
v->vdist *= normalize(v->vdir); /* normalize direction */ |
40 |
if (v->vdist == 0.0) |
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return("zero view direction"); |
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|
43 |
if (normalize(v->vup) == 0.0) /* normalize view up */ |
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return("zero view up vector"); |
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|
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fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
47 |
|
48 |
if (normalize(v->hvec) == 0.0) |
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return("view up parallel to view direction"); |
50 |
|
51 |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
52 |
|
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if (v->horiz <= FTINY) |
54 |
return(ill_horiz); |
55 |
if (v->vert <= FTINY) |
56 |
return(ill_vert); |
57 |
|
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switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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v->hn2 = v->horiz; |
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v->vn2 = v->vert; |
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break; |
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case VT_PER: /* perspective view */ |
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if (v->horiz >= 180.0-FTINY) |
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return(ill_horiz); |
66 |
if (v->vert >= 180.0-FTINY) |
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return(ill_vert); |
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v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
71 |
case VT_CYL: /* cylindrical panorama */ |
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if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
74 |
if (v->vert >= 180.0-FTINY) |
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return(ill_vert); |
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v->hn2 = v->horiz * (PI/180.0); |
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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
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case VT_ANG: /* angular fisheye */ |
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if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
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if (v->vert > 360.0+FTINY) |
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return(ill_vert); |
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v->hn2 = v->horiz * (PI/180.0); |
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v->vn2 = v->vert * (PI/180.0); |
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break; |
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case VT_HEM: /* hemispherical fisheye */ |
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if (v->horiz > 180.0+FTINY) |
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return(ill_horiz); |
90 |
if (v->vert > 180.0+FTINY) |
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return(ill_vert); |
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v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0)); |
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v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0)); |
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break; |
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default: |
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return("unknown view type"); |
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} |
98 |
if (v->type != VT_ANG) { |
99 |
if (v->type != VT_CYL) { |
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v->hvec[0] *= v->hn2; |
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v->hvec[1] *= v->hn2; |
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v->hvec[2] *= v->hn2; |
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} |
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v->vvec[0] *= v->vn2; |
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v->vvec[1] *= v->vn2; |
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v->vvec[2] *= v->vn2; |
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} |
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v->hn2 *= v->hn2; |
109 |
v->vn2 *= v->vn2; |
110 |
|
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return(NULL); |
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} |
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|
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|
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void |
116 |
normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
117 |
double va; /* view aspect ratio */ |
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double *ap; /* pixel aspect in (or out if 0) */ |
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int *xp, *yp; /* x and y resolution in (or out if *ap!=0) */ |
120 |
{ |
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if (*ap <= FTINY) |
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*ap = va * *xp / *yp; /* compute pixel aspect */ |
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else if (va * *xp > *ap * *yp) |
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*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
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else |
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*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
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} |
128 |
|
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|
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double |
131 |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
132 |
FVECT orig, direc; |
133 |
register VIEW *v; |
134 |
double x, y; |
135 |
{ |
136 |
double d, z; |
137 |
|
138 |
x += v->hoff - 0.5; |
139 |
y += v->voff - 0.5; |
140 |
|
141 |
switch(v->type) { |
142 |
case VT_PAR: /* parallel view */ |
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orig[0] = v->vp[0] + v->vfore*v->vdir[0] |
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+ x*v->hvec[0] + y*v->vvec[0]; |
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orig[1] = v->vp[1] + v->vfore*v->vdir[1] |
146 |
+ x*v->hvec[1] + y*v->vvec[1]; |
147 |
orig[2] = v->vp[2] + v->vfore*v->vdir[2] |
148 |
+ x*v->hvec[2] + y*v->vvec[2]; |
149 |
VCOPY(direc, v->vdir); |
150 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
151 |
case VT_PER: /* perspective view */ |
152 |
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
153 |
direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
154 |
direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
157 |
orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
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return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
160 |
case VT_HEM: /* hemispherical fisheye */ |
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z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
162 |
if (z < 0.0) |
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return(-1.0); |
164 |
z = sqrt(z); |
165 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
166 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
170 |
orig[2] = v->vp[2] + v->vfore*direc[2]; |
171 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
172 |
case VT_CYL: /* cylindrical panorama */ |
173 |
d = x * v->horiz * (PI/180.0); |
174 |
z = cos(d); |
175 |
x = sin(d); |
176 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
177 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
178 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
179 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
180 |
orig[1] = v->vp[1] + v->vfore*direc[1]; |
181 |
orig[2] = v->vp[2] + v->vfore*direc[2]; |
182 |
d = normalize(direc); |
183 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
184 |
case VT_ANG: /* angular fisheye */ |
185 |
x *= v->horiz/180.0; |
186 |
y *= v->vert/180.0; |
187 |
d = x*x + y*y; |
188 |
if (d > 1.0) |
189 |
return(-1.0); |
190 |
d = sqrt(d); |
191 |
z = cos(PI*d); |
192 |
d = d <= FTINY ? PI : sqrt(1 - z*z)/d; |
193 |
x *= d; |
194 |
y *= d; |
195 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
196 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
197 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
199 |
orig[1] = v->vp[1] + v->vfore*direc[1]; |
200 |
orig[2] = v->vp[2] + v->vfore*direc[2]; |
201 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
202 |
} |
203 |
return(-1.0); |
204 |
} |
205 |
|
206 |
|
207 |
void |
208 |
viewloc(ip, v, p) /* find image location for point */ |
209 |
FVECT ip; |
210 |
register VIEW *v; |
211 |
FVECT p; |
212 |
{ |
213 |
double d, d2; |
214 |
FVECT disp; |
215 |
|
216 |
disp[0] = p[0] - v->vp[0]; |
217 |
disp[1] = p[1] - v->vp[1]; |
218 |
disp[2] = p[2] - v->vp[2]; |
219 |
|
220 |
switch (v->type) { |
221 |
case VT_PAR: /* parallel view */ |
222 |
ip[2] = DOT(disp,v->vdir) - v->vfore; |
223 |
break; |
224 |
case VT_PER: /* perspective view */ |
225 |
d = DOT(disp,v->vdir); |
226 |
ip[2] = VLEN(disp); |
227 |
if (d < 0.0) { /* fold pyramid */ |
228 |
ip[2] = -ip[2]; |
229 |
d = -d; |
230 |
} |
231 |
if (d > FTINY) { |
232 |
d = 1.0/d; |
233 |
disp[0] *= d; |
234 |
disp[1] *= d; |
235 |
disp[2] *= d; |
236 |
} |
237 |
ip[2] *= (1.0 - v->vfore*d); |
238 |
break; |
239 |
case VT_HEM: /* hemispherical fisheye */ |
240 |
d = normalize(disp); |
241 |
if (DOT(disp,v->vdir) < 0.0) |
242 |
ip[2] = -d; |
243 |
else |
244 |
ip[2] = d; |
245 |
ip[2] -= v->vfore; |
246 |
break; |
247 |
case VT_CYL: /* cylindrical panorama */ |
248 |
d = DOT(disp,v->hvec); |
249 |
d2 = DOT(disp,v->vdir); |
250 |
ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff; |
251 |
d = 1.0/sqrt(d*d + d2*d2); |
252 |
ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff; |
253 |
ip[2] = VLEN(disp); |
254 |
ip[2] *= (1.0 - v->vfore*d); |
255 |
return; |
256 |
case VT_ANG: /* angular fisheye */ |
257 |
ip[0] = 0.5 - v->hoff; |
258 |
ip[1] = 0.5 - v->voff; |
259 |
ip[2] = normalize(disp) - v->vfore; |
260 |
d = DOT(disp,v->vdir); |
261 |
if (d >= 1.0-FTINY) |
262 |
return; |
263 |
if (d <= -(1.0-FTINY)) { |
264 |
ip[0] += 180.0/v->horiz; |
265 |
return; |
266 |
} |
267 |
d = acos(d)/PI / sqrt(1.0 - d*d); |
268 |
ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz; |
269 |
ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert; |
270 |
return; |
271 |
} |
272 |
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
273 |
ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
274 |
} |
275 |
|
276 |
|
277 |
void |
278 |
pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */ |
279 |
RREAL loc[2]; |
280 |
register RESOLU *rp; |
281 |
int px, py; |
282 |
{ |
283 |
register int x, y; |
284 |
|
285 |
if (rp->rt & YMAJOR) { |
286 |
x = px; |
287 |
y = py; |
288 |
} else { |
289 |
x = py; |
290 |
y = px; |
291 |
} |
292 |
if (rp->rt & XDECR) |
293 |
x = rp->xr-1 - x; |
294 |
if (rp->rt & YDECR) |
295 |
y = rp->yr-1 - y; |
296 |
loc[0] = (x+.5)/rp->xr; |
297 |
loc[1] = (y+.5)/rp->yr; |
298 |
} |
299 |
|
300 |
|
301 |
void |
302 |
loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */ |
303 |
int pp[2]; |
304 |
register RESOLU *rp; |
305 |
double lx, ly; |
306 |
{ |
307 |
register int x, y; |
308 |
|
309 |
x = lx * rp->xr; |
310 |
y = ly * rp->yr; |
311 |
if (rp->rt & XDECR) |
312 |
x = rp->xr-1 - x; |
313 |
if (rp->rt & YDECR) |
314 |
y = rp->yr-1 - y; |
315 |
if (rp->rt & YMAJOR) { |
316 |
pp[0] = x; |
317 |
pp[1] = y; |
318 |
} else { |
319 |
pp[0] = y; |
320 |
pp[1] = x; |
321 |
} |
322 |
} |
323 |
|
324 |
|
325 |
int |
326 |
getviewopt(v, ac, av) /* process view argument */ |
327 |
register VIEW *v; |
328 |
int ac; |
329 |
register char *av[]; |
330 |
{ |
331 |
#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
332 |
badarg(ac-1,av+1,l)) return(-1) |
333 |
|
334 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
335 |
return(-1); |
336 |
switch (av[0][2]) { |
337 |
case 't': /* type */ |
338 |
if (!av[0][3] || av[0][3]==' ') |
339 |
return(-1); |
340 |
check(4,""); |
341 |
v->type = av[0][3]; |
342 |
return(0); |
343 |
case 'p': /* point */ |
344 |
check(3,"fff"); |
345 |
v->vp[0] = atof(av[1]); |
346 |
v->vp[1] = atof(av[2]); |
347 |
v->vp[2] = atof(av[3]); |
348 |
return(3); |
349 |
case 'd': /* direction */ |
350 |
check(3,"fff"); |
351 |
v->vdir[0] = atof(av[1]); |
352 |
v->vdir[1] = atof(av[2]); |
353 |
v->vdir[2] = atof(av[3]); |
354 |
v->vdist = 1.; |
355 |
return(3); |
356 |
case 'u': /* up */ |
357 |
check(3,"fff"); |
358 |
v->vup[0] = atof(av[1]); |
359 |
v->vup[1] = atof(av[2]); |
360 |
v->vup[2] = atof(av[3]); |
361 |
return(3); |
362 |
case 'h': /* horizontal size */ |
363 |
check(3,"f"); |
364 |
v->horiz = atof(av[1]); |
365 |
return(1); |
366 |
case 'v': /* vertical size */ |
367 |
check(3,"f"); |
368 |
v->vert = atof(av[1]); |
369 |
return(1); |
370 |
case 'o': /* fore clipping plane */ |
371 |
check(3,"f"); |
372 |
v->vfore = atof(av[1]); |
373 |
return(1); |
374 |
case 'a': /* aft clipping plane */ |
375 |
check(3,"f"); |
376 |
v->vaft = atof(av[1]); |
377 |
return(1); |
378 |
case 's': /* shift */ |
379 |
check(3,"f"); |
380 |
v->hoff = atof(av[1]); |
381 |
return(1); |
382 |
case 'l': /* lift */ |
383 |
check(3,"f"); |
384 |
v->voff = atof(av[1]); |
385 |
return(1); |
386 |
default: |
387 |
return(-1); |
388 |
} |
389 |
#undef check |
390 |
} |
391 |
|
392 |
|
393 |
int |
394 |
sscanview(vp, s) /* get view parameters from string */ |
395 |
VIEW *vp; |
396 |
register char *s; |
397 |
{ |
398 |
int ac; |
399 |
char *av[4]; |
400 |
int na; |
401 |
int nvopts = 0; |
402 |
|
403 |
while (*s == ' ') |
404 |
s++; |
405 |
if (*s != '-') |
406 |
s = sskip2(s,1); |
407 |
while (*s) { |
408 |
ac = 0; |
409 |
do { |
410 |
if (ac || *s == '-') |
411 |
av[ac++] = s; |
412 |
while (*s && *s != ' ') |
413 |
s++; |
414 |
while (*s == ' ') |
415 |
s++; |
416 |
} while (*s && ac < 4); |
417 |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
418 |
if (na+1 < ac) |
419 |
s = av[na+1]; |
420 |
nvopts++; |
421 |
} else if (ac > 1) |
422 |
s = av[1]; |
423 |
} |
424 |
return(nvopts); |
425 |
} |
426 |
|
427 |
|
428 |
void |
429 |
fprintview(vp, fp) /* write out view parameters */ |
430 |
register VIEW *vp; |
431 |
FILE *fp; |
432 |
{ |
433 |
fprintf(fp, " -vt%c", vp->type); |
434 |
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
435 |
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist, |
436 |
vp->vdir[1]*vp->vdist, |
437 |
vp->vdir[2]*vp->vdist); |
438 |
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
439 |
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
440 |
fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
441 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
442 |
} |
443 |
|
444 |
|
445 |
char * |
446 |
viewopt(vp) /* translate to minimal view string */ |
447 |
register VIEW *vp; |
448 |
{ |
449 |
static char vwstr[128]; |
450 |
register char *cp = vwstr; |
451 |
|
452 |
if (vp->type != stdview.type) { |
453 |
sprintf(cp, " -vt%c", vp->type); |
454 |
cp += strlen(cp); |
455 |
} |
456 |
if (!VEQ(vp->vp,stdview.vp)) { |
457 |
sprintf(cp, " -vp %.6g %.6g %.6g", |
458 |
vp->vp[0], vp->vp[1], vp->vp[2]); |
459 |
cp += strlen(cp); |
460 |
} |
461 |
if (!FEQ(vp->vdist,stdview.vdist) || !VEQ(vp->vdir,stdview.vdir)) { |
462 |
sprintf(cp, " -vd %.6g %.6g %.6g", |
463 |
vp->vdir[0]*vp->vdist, |
464 |
vp->vdir[1]*vp->vdist, |
465 |
vp->vdir[2]*vp->vdist); |
466 |
cp += strlen(cp); |
467 |
} |
468 |
if (!VEQ(vp->vup,stdview.vup)) { |
469 |
sprintf(cp, " -vu %.6g %.6g %.6g", |
470 |
vp->vup[0], vp->vup[1], vp->vup[2]); |
471 |
cp += strlen(cp); |
472 |
} |
473 |
if (!FEQ(vp->horiz,stdview.horiz)) { |
474 |
sprintf(cp, " -vh %.6g", vp->horiz); |
475 |
cp += strlen(cp); |
476 |
} |
477 |
if (!FEQ(vp->vert,stdview.vert)) { |
478 |
sprintf(cp, " -vv %.6g", vp->vert); |
479 |
cp += strlen(cp); |
480 |
} |
481 |
if (!FEQ(vp->vfore,stdview.vfore)) { |
482 |
sprintf(cp, " -vo %.6g", vp->vfore); |
483 |
cp += strlen(cp); |
484 |
} |
485 |
if (!FEQ(vp->vaft,stdview.vaft)) { |
486 |
sprintf(cp, " -va %.6g", vp->vaft); |
487 |
cp += strlen(cp); |
488 |
} |
489 |
if (!FEQ(vp->hoff,stdview.hoff)) { |
490 |
sprintf(cp, " -vs %.6g", vp->hoff); |
491 |
cp += strlen(cp); |
492 |
} |
493 |
if (!FEQ(vp->voff,stdview.voff)) { |
494 |
sprintf(cp, " -vl %.6g", vp->voff); |
495 |
cp += strlen(cp); |
496 |
} |
497 |
return(vwstr); |
498 |
} |
499 |
|
500 |
|
501 |
int |
502 |
isview(s) /* is this a view string? */ |
503 |
char *s; |
504 |
{ |
505 |
static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL}; |
506 |
extern char *progname; |
507 |
register char *cp; |
508 |
register char **an; |
509 |
/* add program name to list */ |
510 |
if (altname[0] == NULL) { |
511 |
for (cp = progname; *cp; cp++) |
512 |
; |
513 |
while (cp > progname && !ISDIRSEP(cp[-1])) |
514 |
cp--; |
515 |
altname[0] = cp; |
516 |
} |
517 |
/* skip leading path */ |
518 |
cp = s; |
519 |
while (*cp && *cp != ' ') |
520 |
cp++; |
521 |
while (cp > s && !ISDIRSEP(cp[-1])) |
522 |
cp--; |
523 |
for (an = altname; *an != NULL; an++) |
524 |
if (!strncmp(*an, cp, strlen(*an))) |
525 |
return(1); |
526 |
return(0); |
527 |
} |
528 |
|
529 |
|
530 |
struct myview { |
531 |
VIEW *hv; |
532 |
int ok; |
533 |
}; |
534 |
|
535 |
|
536 |
static int |
537 |
gethview( /* get view from header */ |
538 |
char *s, |
539 |
void *v |
540 |
) |
541 |
{ |
542 |
if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0) |
543 |
((struct myview*)v)->ok++; |
544 |
return(0); |
545 |
} |
546 |
|
547 |
|
548 |
int |
549 |
viewfile(fname, vp, rp) /* get view from file */ |
550 |
char *fname; |
551 |
VIEW *vp; |
552 |
RESOLU *rp; |
553 |
{ |
554 |
struct myview mvs; |
555 |
FILE *fp; |
556 |
|
557 |
if (fname == NULL || !strcmp(fname, "-")) |
558 |
fp = stdin; |
559 |
else if ((fp = fopen(fname, "r")) == NULL) |
560 |
return(-1); |
561 |
|
562 |
mvs.hv = vp; |
563 |
mvs.ok = 0; |
564 |
|
565 |
getheader(fp, gethview, &mvs); |
566 |
|
567 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
568 |
mvs.ok = 0; |
569 |
|
570 |
fclose(fp); |
571 |
|
572 |
return(mvs.ok); |
573 |
} |