| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: image.c,v 2.54 2022/01/13 00:26:09 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" |
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|
| 12 |
#include <ctype.h> |
| 13 |
#include "rtio.h" |
| 14 |
#include "rtmath.h" |
| 15 |
#include "paths.h" |
| 16 |
#include "view.h" |
| 17 |
|
| 18 |
VIEW stdview = STDVIEW; /* default view parameters */ |
| 19 |
|
| 20 |
static gethfunc gethview; |
| 21 |
|
| 22 |
|
| 23 |
char * |
| 24 |
setview( /* set hvec and vvec, return message on error */ |
| 25 |
VIEW *v |
| 26 |
) |
| 27 |
{ |
| 28 |
static char ill_horiz[] = "illegal horizontal view size"; |
| 29 |
static char ill_vert[] = "illegal vertical view size"; |
| 30 |
|
| 31 |
if ((v->vfore < -FTINY) | (v->vaft < -FTINY) || |
| 32 |
(v->vaft > FTINY) & (v->vaft <= v->vfore)) |
| 33 |
return("illegal fore/aft clipping plane"); |
| 34 |
|
| 35 |
if (v->vdist <= FTINY) |
| 36 |
return("illegal view distance"); |
| 37 |
v->vdist *= normalize(v->vdir); /* normalize direction */ |
| 38 |
if (v->vdist == 0.0) |
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return("zero view direction"); |
| 40 |
|
| 41 |
if (normalize(v->vup) == 0.0) /* normalize view up */ |
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return("zero view up vector"); |
| 43 |
|
| 44 |
fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
| 45 |
|
| 46 |
if (normalize(v->hvec) == 0.0) |
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return("view up parallel to view direction"); |
| 48 |
|
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fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
| 50 |
|
| 51 |
if (v->horiz <= FTINY) |
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return(ill_horiz); |
| 53 |
if (v->vert <= FTINY) |
| 54 |
return(ill_vert); |
| 55 |
|
| 56 |
switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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v->hn2 = v->horiz; |
| 59 |
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); |
| 64 |
if (v->vert >= 180.0-FTINY) |
| 65 |
return(ill_vert); |
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v->hn2 = 2.0 * tan(v->horiz*(PI/360.)); |
| 67 |
v->vn2 = 2.0 * tan(v->vert*(PI/360.)); |
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break; |
| 69 |
case VT_CYL: /* cylindrical panorama */ |
| 70 |
if (v->horiz > 360.0+FTINY) |
| 71 |
return(ill_horiz); |
| 72 |
if (v->vert >= 180.0-FTINY) |
| 73 |
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/360.)); |
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break; |
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case VT_ANG: /* angular fisheye */ |
| 78 |
if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
| 80 |
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 */ |
| 86 |
if (v->horiz > 180.0+FTINY) |
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return(ill_horiz); |
| 88 |
if (v->vert > 180.0+FTINY) |
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return(ill_vert); |
| 90 |
v->hn2 = 2.0 * sin(v->horiz*(PI/360.)); |
| 91 |
v->vn2 = 2.0 * sin(v->vert*(PI/360.)); |
| 92 |
break; |
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case VT_PLS: /* planispheric fisheye */ |
| 94 |
if (v->horiz >= 360.0-FTINY) |
| 95 |
return(ill_horiz); |
| 96 |
if (v->vert >= 360.0-FTINY) |
| 97 |
return(ill_vert); |
| 98 |
v->hn2 = 2.*sin(v->horiz*(PI/360.)) / |
| 99 |
(1.0 + cos(v->horiz*(PI/360.))); |
| 100 |
v->vn2 = 2.*sin(v->vert*(PI/360.)) / |
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(1.0 + cos(v->vert*(PI/360.))); |
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break; |
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default: |
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return("unknown view type"); |
| 105 |
} |
| 106 |
if (v->type != VT_ANG && v->type != VT_PLS) { |
| 107 |
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; |
| 117 |
v->vn2 *= v->vn2; |
| 118 |
|
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return(NULL); |
| 120 |
} |
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|
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|
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char * |
| 124 |
cropview( /* crop a view to the indicated bounds */ |
| 125 |
VIEW *v, |
| 126 |
double x0, |
| 127 |
double y0, |
| 128 |
double x1, |
| 129 |
double y1 |
| 130 |
) |
| 131 |
{ |
| 132 |
static char ill_hemi[] = "illegal crop for hemispherical view"; |
| 133 |
double d; |
| 134 |
/* order crop extrema */ |
| 135 |
if (x0 > x1) { d=x0; x0=x1; x1=d; } |
| 136 |
if (y0 > y1) { d=y0; y0=y1; y1=d; } |
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|
| 138 |
if ((x1-x0 <= FTINY) | (y1-y0 <= FTINY)) |
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return("zero crop area"); |
| 140 |
|
| 141 |
d = x1 - x0; /* adjust horizontal size? */ |
| 142 |
if (!FABSEQ(d, 1.)) |
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switch (v->type) { |
| 144 |
case VT_PER: |
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v->horiz = 360./PI*atan( d*tan(PI/360.*v->horiz) ); |
| 146 |
break; |
| 147 |
case VT_PAR: |
| 148 |
case VT_ANG: |
| 149 |
case VT_CYL: |
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v->horiz *= d; |
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break; |
| 152 |
case VT_HEM: |
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d *= sin(PI/360.*v->horiz); |
| 154 |
if (d > 1.) |
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return(ill_hemi); |
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v->horiz = 360./PI*asin( d ); |
| 157 |
break; |
| 158 |
case VT_PLS: |
| 159 |
d *= sin(PI/360.*v->horiz) / |
| 160 |
(1. + cos(PI/360.*v->horiz)); |
| 161 |
v->horiz = 360./PI*acos( (1. - d*d) / (1. + d*d) ); |
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break; |
| 163 |
} |
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|
| 165 |
d = y1 - y0; /* adjust vertical size? */ |
| 166 |
if (!FABSEQ(d, 1.)) |
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switch (v->type) { |
| 168 |
case VT_PER: |
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case VT_CYL: |
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v->vert = 360./PI*atan( d*tan(PI/360.*v->vert) ); |
| 171 |
break; |
| 172 |
case VT_PAR: |
| 173 |
case VT_ANG: |
| 174 |
v->vert *= d; |
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break; |
| 176 |
case VT_HEM: |
| 177 |
d *= sin(PI/360.*v->vert); |
| 178 |
if (d > 1.) |
| 179 |
return(ill_hemi); |
| 180 |
v->vert = 360./PI*asin( d ); |
| 181 |
break; |
| 182 |
case VT_PLS: |
| 183 |
d *= sin(PI/360.*v->vert) / |
| 184 |
(1. + cos(PI/360.*v->vert)); |
| 185 |
v->vert = 360./PI*acos( (1. - d*d) / (1. + d*d) ); |
| 186 |
break; |
| 187 |
} |
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/* adjust offsets */ |
| 189 |
v->hoff = ((x0 + x1)*.5 - .5 + v->hoff) / (x1 - x0); |
| 190 |
v->voff = ((y0 + y1)*.5 - .5 + v->voff) / (y1 - y0); |
| 191 |
|
| 192 |
return(setview(v)); /* final error checks & set-up */ |
| 193 |
} |
| 194 |
|
| 195 |
|
| 196 |
void |
| 197 |
normaspect( /* fix pixel aspect or resolution */ |
| 198 |
double va, /* view aspect ratio */ |
| 199 |
double *ap, /* pixel aspect in (or out if 0) */ |
| 200 |
int *xp, |
| 201 |
int *yp /* x and y resolution in (or out if *ap!=0) */ |
| 202 |
) |
| 203 |
{ |
| 204 |
if (*ap <= FTINY) |
| 205 |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
| 206 |
else if (va * *xp > *ap * *yp) |
| 207 |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
| 208 |
else |
| 209 |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
| 210 |
} |
| 211 |
|
| 212 |
|
| 213 |
double |
| 214 |
viewray( /* compute ray origin and direction */ |
| 215 |
FVECT orig, |
| 216 |
FVECT direc, |
| 217 |
VIEW *v, |
| 218 |
double x, |
| 219 |
double y |
| 220 |
) |
| 221 |
{ |
| 222 |
double d, z; |
| 223 |
|
| 224 |
x += v->hoff - 0.5; |
| 225 |
y += v->voff - 0.5; |
| 226 |
|
| 227 |
switch(v->type) { |
| 228 |
case VT_PAR: /* parallel view */ |
| 229 |
orig[0] = v->vp[0] + v->vfore*v->vdir[0] |
| 230 |
+ x*v->hvec[0] + y*v->vvec[0]; |
| 231 |
orig[1] = v->vp[1] + v->vfore*v->vdir[1] |
| 232 |
+ x*v->hvec[1] + y*v->vvec[1]; |
| 233 |
orig[2] = v->vp[2] + v->vfore*v->vdir[2] |
| 234 |
+ x*v->hvec[2] + y*v->vvec[2]; |
| 235 |
VCOPY(direc, v->vdir); |
| 236 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
| 237 |
case VT_PER: /* perspective view */ |
| 238 |
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 239 |
direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 240 |
direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 241 |
VSUM(orig, v->vp, direc, v->vfore); |
| 242 |
d = normalize(direc); |
| 243 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
| 244 |
case VT_HEM: /* hemispherical fisheye */ |
| 245 |
z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
| 246 |
if (z < 0.0) |
| 247 |
return(-1.0); |
| 248 |
z = sqrt(z); |
| 249 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 250 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 251 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 252 |
VSUM(orig, v->vp, direc, v->vfore); |
| 253 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
| 254 |
case VT_CYL: /* cylindrical panorama */ |
| 255 |
d = x * v->horiz * (PI/180.0); |
| 256 |
z = cos(d); |
| 257 |
x = sin(d); |
| 258 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 259 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 260 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 261 |
VSUM(orig, v->vp, direc, v->vfore); |
| 262 |
d = normalize(direc); |
| 263 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
| 264 |
case VT_ANG: /* angular fisheye */ |
| 265 |
x *= (1.0/180.0)*v->horiz; |
| 266 |
y *= (1.0/180.0)*v->vert; |
| 267 |
d = x*x + y*y; |
| 268 |
if (d > 1.0) |
| 269 |
return(-1.0); |
| 270 |
d = sqrt(d); |
| 271 |
z = cos(PI*d); |
| 272 |
d = d <= FTINY ? PI : sqrt(1.0 - z*z)/d; |
| 273 |
x *= d; |
| 274 |
y *= d; |
| 275 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 276 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 277 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 278 |
VSUM(orig, v->vp, direc, v->vfore); |
| 279 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
| 280 |
case VT_PLS: /* planispheric fisheye */ |
| 281 |
x *= sqrt(v->hn2); |
| 282 |
y *= sqrt(v->vn2); |
| 283 |
d = x*x + y*y; |
| 284 |
z = (1. - d)/(1. + d); |
| 285 |
x *= (1. + z); |
| 286 |
y *= (1. + z); |
| 287 |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
| 288 |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
| 289 |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
| 290 |
VSUM(orig, v->vp, direc, v->vfore); |
| 291 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
| 292 |
} |
| 293 |
return(-1.0); |
| 294 |
} |
| 295 |
|
| 296 |
|
| 297 |
int |
| 298 |
viewloc( /* find image location for point */ |
| 299 |
FVECT ip, |
| 300 |
VIEW *v, |
| 301 |
FVECT p |
| 302 |
) /* Use VL_* flags to interpret return value */ |
| 303 |
{ |
| 304 |
int rflags = VL_GOOD; |
| 305 |
double d, d2; |
| 306 |
FVECT disp; |
| 307 |
|
| 308 |
VSUB(disp, p, v->vp); |
| 309 |
|
| 310 |
switch (v->type) { |
| 311 |
case VT_PAR: /* parallel view */ |
| 312 |
ip[2] = DOT(disp,v->vdir) - v->vfore; |
| 313 |
break; |
| 314 |
case VT_PER: /* perspective view */ |
| 315 |
d = DOT(disp,v->vdir); |
| 316 |
rflags |= VL_BEYOND*((v->vaft > FTINY) & |
| 317 |
(d >= v->vaft)); |
| 318 |
ip[2] = VLEN(disp); |
| 319 |
if (d < -FTINY) { /* fold pyramid */ |
| 320 |
ip[2] = -ip[2]; |
| 321 |
d = -d; |
| 322 |
} else if (d <= FTINY) |
| 323 |
return(VL_BAD); /* at infinite edge */ |
| 324 |
d = 1.0/d; |
| 325 |
disp[0] *= d; |
| 326 |
disp[1] *= d; |
| 327 |
disp[2] *= d; |
| 328 |
if (ip[2] < 0.0) d = -d; |
| 329 |
ip[2] *= (1.0 - v->vfore*d); |
| 330 |
break; |
| 331 |
case VT_HEM: /* hemispherical fisheye */ |
| 332 |
d = normalize(disp); |
| 333 |
if (DOT(disp,v->vdir) < 0.0) |
| 334 |
ip[2] = -d; |
| 335 |
else |
| 336 |
ip[2] = d; |
| 337 |
ip[2] -= v->vfore; |
| 338 |
break; |
| 339 |
case VT_CYL: /* cylindrical panorama */ |
| 340 |
d = DOT(disp,v->hvec); |
| 341 |
d2 = DOT(disp,v->vdir); |
| 342 |
ip[0] = 180.0/PI * atan2(d,d2) / v->horiz + 0.5 - v->hoff; |
| 343 |
d2 = d*d + d2*d2; |
| 344 |
if (d2 <= FTINY*FTINY) |
| 345 |
return(VL_BAD); /* at pole */ |
| 346 |
rflags |= VL_BEYOND*((v->vaft > FTINY) & |
| 347 |
(d2 >= v->vaft*v->vaft)); |
| 348 |
d = 1.0/sqrt(d2); |
| 349 |
ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff; |
| 350 |
ip[2] = VLEN(disp); |
| 351 |
ip[2] *= (1.0 - v->vfore*d); |
| 352 |
goto gotall; |
| 353 |
case VT_ANG: /* angular fisheye */ |
| 354 |
ip[0] = 0.5 - v->hoff; |
| 355 |
ip[1] = 0.5 - v->voff; |
| 356 |
ip[2] = normalize(disp) - v->vfore; |
| 357 |
d = DOT(disp,v->vdir); |
| 358 |
if (d >= 1.0-FTINY) |
| 359 |
goto gotall; |
| 360 |
if (d <= -(1.0-FTINY)) { |
| 361 |
ip[0] += 180.0/v->horiz; |
| 362 |
goto gotall; |
| 363 |
} |
| 364 |
d = (180.0/PI)*acos(d) / sqrt(1.0 - d*d); |
| 365 |
ip[0] += DOT(disp,v->hvec)*d/v->horiz; |
| 366 |
ip[1] += DOT(disp,v->vvec)*d/v->vert; |
| 367 |
goto gotall; |
| 368 |
case VT_PLS: /* planispheric fisheye */ |
| 369 |
ip[0] = 0.5 - v->hoff; |
| 370 |
ip[1] = 0.5 - v->voff; |
| 371 |
ip[2] = normalize(disp) - v->vfore; |
| 372 |
d = DOT(disp,v->vdir); |
| 373 |
if (d >= 1.0-FTINY) |
| 374 |
goto gotall; |
| 375 |
if (d <= -(1.0-FTINY)) |
| 376 |
return(VL_BAD); |
| 377 |
ip[0] += DOT(disp,v->hvec)/((1. + d)*sqrt(v->hn2)); |
| 378 |
ip[1] += DOT(disp,v->vvec)/((1. + d)*sqrt(v->vn2)); |
| 379 |
goto gotall; |
| 380 |
default: |
| 381 |
return(VL_BAD); |
| 382 |
} |
| 383 |
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
| 384 |
ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
| 385 |
gotall: /* add appropriate return flags */ |
| 386 |
if (ip[2] <= 0.0) |
| 387 |
rflags |= VL_BEHIND; |
| 388 |
else if ((v->type != VT_PER) & (v->type != VT_CYL)) |
| 389 |
rflags |= VL_BEYOND*((v->vaft > FTINY) & |
| 390 |
(ip[2] >= v->vaft - v->vfore)); |
| 391 |
rflags |= VL_OUTSIDE*((0.0 >= ip[0]) | (ip[0] >= 1.0) | |
| 392 |
(0.0 >= ip[1]) | (ip[1] >= 1.0)); |
| 393 |
return(rflags); |
| 394 |
} |
| 395 |
|
| 396 |
|
| 397 |
void |
| 398 |
pix2loc( /* compute image location from pixel pos. */ |
| 399 |
RREAL loc[2], |
| 400 |
RESOLU *rp, |
| 401 |
int px, |
| 402 |
int py |
| 403 |
) |
| 404 |
{ |
| 405 |
int x, y; |
| 406 |
|
| 407 |
if (rp->rt & YMAJOR) { |
| 408 |
x = px; |
| 409 |
y = py; |
| 410 |
} else { |
| 411 |
x = py; |
| 412 |
y = px; |
| 413 |
} |
| 414 |
if (rp->rt & XDECR) |
| 415 |
x = rp->xr-1 - x; |
| 416 |
if (rp->rt & YDECR) |
| 417 |
y = rp->yr-1 - y; |
| 418 |
loc[0] = (x+.5)/rp->xr; |
| 419 |
loc[1] = (y+.5)/rp->yr; |
| 420 |
} |
| 421 |
|
| 422 |
|
| 423 |
void |
| 424 |
loc2pix( /* compute pixel pos. from image location */ |
| 425 |
int pp[2], |
| 426 |
RESOLU *rp, |
| 427 |
double lx, |
| 428 |
double ly |
| 429 |
) |
| 430 |
{ |
| 431 |
int x, y; |
| 432 |
|
| 433 |
x = (int)(lx*rp->xr + .5 - (lx < 0.0)); |
| 434 |
y = (int)(ly*rp->yr + .5 - (ly < 0.0)); |
| 435 |
|
| 436 |
if (rp->rt & XDECR) |
| 437 |
x = rp->xr-1 - x; |
| 438 |
if (rp->rt & YDECR) |
| 439 |
y = rp->yr-1 - y; |
| 440 |
if (rp->rt & YMAJOR) { |
| 441 |
pp[0] = x; |
| 442 |
pp[1] = y; |
| 443 |
} else { |
| 444 |
pp[0] = y; |
| 445 |
pp[1] = x; |
| 446 |
} |
| 447 |
} |
| 448 |
|
| 449 |
|
| 450 |
int |
| 451 |
getviewopt( /* process view argument */ |
| 452 |
VIEW *v, |
| 453 |
int ac, |
| 454 |
char *av[] |
| 455 |
) |
| 456 |
{ |
| 457 |
#define check(c,l) if ((av[0][c]&&!isspace(av[0][c])) || \ |
| 458 |
badarg(ac-1,av+1,l)) return(-1) |
| 459 |
|
| 460 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
| 461 |
return(-1); |
| 462 |
switch (av[0][2]) { |
| 463 |
case 't': /* type */ |
| 464 |
if (!av[0][3] || isspace(av[0][3])) |
| 465 |
return(-1); |
| 466 |
check(4,""); |
| 467 |
v->type = av[0][3]; |
| 468 |
return(0); |
| 469 |
case 'p': /* point */ |
| 470 |
check(3,"fff"); |
| 471 |
v->vp[0] = atof(av[1]); |
| 472 |
v->vp[1] = atof(av[2]); |
| 473 |
v->vp[2] = atof(av[3]); |
| 474 |
return(3); |
| 475 |
case 'd': /* direction */ |
| 476 |
check(3,"fff"); |
| 477 |
v->vdir[0] = atof(av[1]); |
| 478 |
v->vdir[1] = atof(av[2]); |
| 479 |
v->vdir[2] = atof(av[3]); |
| 480 |
v->vdist = 1.; |
| 481 |
return(3); |
| 482 |
case 'u': /* up */ |
| 483 |
check(3,"fff"); |
| 484 |
v->vup[0] = atof(av[1]); |
| 485 |
v->vup[1] = atof(av[2]); |
| 486 |
v->vup[2] = atof(av[3]); |
| 487 |
return(3); |
| 488 |
case 'h': /* horizontal size */ |
| 489 |
check(3,"f"); |
| 490 |
v->horiz = atof(av[1]); |
| 491 |
return(1); |
| 492 |
case 'v': /* vertical size */ |
| 493 |
check(3,"f"); |
| 494 |
v->vert = atof(av[1]); |
| 495 |
return(1); |
| 496 |
case 'o': /* fore clipping plane */ |
| 497 |
check(3,"f"); |
| 498 |
v->vfore = atof(av[1]); |
| 499 |
return(1); |
| 500 |
case 'a': /* aft clipping plane */ |
| 501 |
check(3,"f"); |
| 502 |
v->vaft = atof(av[1]); |
| 503 |
return(1); |
| 504 |
case 's': /* shift */ |
| 505 |
check(3,"f"); |
| 506 |
v->hoff = atof(av[1]); |
| 507 |
return(1); |
| 508 |
case 'l': /* lift */ |
| 509 |
check(3,"f"); |
| 510 |
v->voff = atof(av[1]); |
| 511 |
return(1); |
| 512 |
default: |
| 513 |
return(-1); |
| 514 |
} |
| 515 |
#undef check |
| 516 |
} |
| 517 |
|
| 518 |
|
| 519 |
int |
| 520 |
sscanview( /* get view parameters from string */ |
| 521 |
VIEW *vp, |
| 522 |
char *s |
| 523 |
) |
| 524 |
{ |
| 525 |
int ac; |
| 526 |
char *av[4]; |
| 527 |
int na; |
| 528 |
int nvopts = 0; |
| 529 |
|
| 530 |
while (isspace(*s)) |
| 531 |
if (!*s++) |
| 532 |
return(0); |
| 533 |
while (*s) { |
| 534 |
ac = 0; |
| 535 |
do { |
| 536 |
if (ac || *s == '-') |
| 537 |
av[ac++] = s; |
| 538 |
while (*s && !isspace(*s)) |
| 539 |
s++; |
| 540 |
while (isspace(*s)) |
| 541 |
s++; |
| 542 |
} while (*s && ac < 4); |
| 543 |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
| 544 |
if (na+1 < ac) |
| 545 |
s = av[na+1]; |
| 546 |
nvopts++; |
| 547 |
} else if (ac > 1) |
| 548 |
s = av[1]; |
| 549 |
} |
| 550 |
return(nvopts); |
| 551 |
} |
| 552 |
|
| 553 |
|
| 554 |
void |
| 555 |
fprintview( /* write out view parameters */ |
| 556 |
VIEW *vp, |
| 557 |
FILE *fp |
| 558 |
) |
| 559 |
{ |
| 560 |
fprintf(fp, " -vt%c", vp->type); |
| 561 |
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
| 562 |
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0]*vp->vdist, |
| 563 |
vp->vdir[1]*vp->vdist, |
| 564 |
vp->vdir[2]*vp->vdist); |
| 565 |
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
| 566 |
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
| 567 |
fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
| 568 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
| 569 |
} |
| 570 |
|
| 571 |
|
| 572 |
char * |
| 573 |
viewopt( /* translate to minimal view string */ |
| 574 |
VIEW *vp |
| 575 |
) |
| 576 |
{ |
| 577 |
static char vwstr[128]; |
| 578 |
char *cp = vwstr; |
| 579 |
|
| 580 |
*cp = '\0'; |
| 581 |
if (vp->type != stdview.type) { |
| 582 |
sprintf(cp, " -vt%c", vp->type); |
| 583 |
cp += strlen(cp); |
| 584 |
} |
| 585 |
if (!VABSEQ(vp->vp,stdview.vp)) { |
| 586 |
sprintf(cp, " -vp %.6g %.6g %.6g", |
| 587 |
vp->vp[0], vp->vp[1], vp->vp[2]); |
| 588 |
cp += strlen(cp); |
| 589 |
} |
| 590 |
if (!FABSEQ(vp->vdist,stdview.vdist) || !VABSEQ(vp->vdir,stdview.vdir)) { |
| 591 |
sprintf(cp, " -vd %.6g %.6g %.6g", |
| 592 |
vp->vdir[0]*vp->vdist, |
| 593 |
vp->vdir[1]*vp->vdist, |
| 594 |
vp->vdir[2]*vp->vdist); |
| 595 |
cp += strlen(cp); |
| 596 |
} |
| 597 |
if (!VABSEQ(vp->vup,stdview.vup)) { |
| 598 |
sprintf(cp, " -vu %.6g %.6g %.6g", |
| 599 |
vp->vup[0], vp->vup[1], vp->vup[2]); |
| 600 |
cp += strlen(cp); |
| 601 |
} |
| 602 |
if (!FABSEQ(vp->horiz,stdview.horiz)) { |
| 603 |
sprintf(cp, " -vh %.6g", vp->horiz); |
| 604 |
cp += strlen(cp); |
| 605 |
} |
| 606 |
if (!FABSEQ(vp->vert,stdview.vert)) { |
| 607 |
sprintf(cp, " -vv %.6g", vp->vert); |
| 608 |
cp += strlen(cp); |
| 609 |
} |
| 610 |
if (!FABSEQ(vp->vfore,stdview.vfore)) { |
| 611 |
sprintf(cp, " -vo %.6g", vp->vfore); |
| 612 |
cp += strlen(cp); |
| 613 |
} |
| 614 |
if (!FABSEQ(vp->vaft,stdview.vaft)) { |
| 615 |
sprintf(cp, " -va %.6g", vp->vaft); |
| 616 |
cp += strlen(cp); |
| 617 |
} |
| 618 |
if (!FABSEQ(vp->hoff,stdview.hoff)) { |
| 619 |
sprintf(cp, " -vs %.6g", vp->hoff); |
| 620 |
cp += strlen(cp); |
| 621 |
} |
| 622 |
if (!FABSEQ(vp->voff,stdview.voff)) { |
| 623 |
sprintf(cp, " -vl %.6g", vp->voff); |
| 624 |
cp += strlen(cp); |
| 625 |
} |
| 626 |
return(vwstr); |
| 627 |
} |
| 628 |
|
| 629 |
|
| 630 |
int |
| 631 |
isview( /* is this a view string? */ |
| 632 |
char *s |
| 633 |
) |
| 634 |
{ |
| 635 |
static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL}; |
| 636 |
extern char *progname; |
| 637 |
char *cp; |
| 638 |
char **an; |
| 639 |
/* add program name to list */ |
| 640 |
if (altname[0] == NULL) { |
| 641 |
for (cp = progname; *cp; cp++) |
| 642 |
; |
| 643 |
while (cp > progname && !ISDIRSEP(cp[-1])) |
| 644 |
cp--; |
| 645 |
altname[0] = cp; |
| 646 |
} |
| 647 |
/* skip leading path */ |
| 648 |
cp = s; |
| 649 |
while (*cp && !isspace(*cp)) |
| 650 |
cp++; |
| 651 |
while (cp > s && !ISDIRSEP(cp[-1])) |
| 652 |
cp--; |
| 653 |
for (an = altname; *an != NULL; an++) |
| 654 |
if (!strncmp(*an, cp, strlen(*an))) |
| 655 |
return(1); |
| 656 |
return(0); |
| 657 |
} |
| 658 |
|
| 659 |
|
| 660 |
struct myview { |
| 661 |
VIEW *hv; |
| 662 |
int ok; |
| 663 |
}; |
| 664 |
|
| 665 |
|
| 666 |
static int |
| 667 |
gethview( /* get view from header */ |
| 668 |
char *s, |
| 669 |
void *v |
| 670 |
) |
| 671 |
{ |
| 672 |
if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0) |
| 673 |
((struct myview*)v)->ok++; |
| 674 |
return(0); |
| 675 |
} |
| 676 |
|
| 677 |
|
| 678 |
int |
| 679 |
viewfile( /* get view from file */ |
| 680 |
char *fname, |
| 681 |
VIEW *vp, |
| 682 |
RESOLU *rp |
| 683 |
) |
| 684 |
{ |
| 685 |
struct myview mvs; |
| 686 |
FILE *fp; |
| 687 |
|
| 688 |
if (fname == NULL || !strcmp(fname, "-")) |
| 689 |
fp = stdin; |
| 690 |
else if ((fp = fopen(fname, "r")) == NULL) |
| 691 |
return(-1); |
| 692 |
|
| 693 |
mvs.hv = vp; |
| 694 |
mvs.ok = 0; |
| 695 |
|
| 696 |
getheader(fp, gethview, &mvs); |
| 697 |
|
| 698 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
| 699 |
mvs.ok = 0; |
| 700 |
|
| 701 |
if (fp != stdin) |
| 702 |
fclose(fp); |
| 703 |
|
| 704 |
return(mvs.ok); |
| 705 |
} |
