1 |
greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* image.c - routines for image generation. |
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* |
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* 10/17/85 |
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*/ |
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#include "standard.h" |
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#include "view.h" |
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greg |
1.5 |
VIEW stdview = STDVIEW; /* default view parameters */ |
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greg |
1.1 |
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char * |
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greg |
1.5 |
setview(v) /* set hvec and vvec, return message on error */ |
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register VIEW *v; |
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greg |
1.3 |
{ |
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greg |
1.12 |
static char ill_horiz[] = "illegal horizontal view size"; |
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static char ill_vert[] = "illegal vertical view size"; |
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greg |
1.1 |
if (normalize(v->vdir) == 0.0) /* normalize direction */ |
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return("zero view direction"); |
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greg |
1.14 |
if (normalize(v->vup) == 0.0) /* normalize view up */ |
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return("zero view up vector"); |
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greg |
1.5 |
fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
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if (normalize(v->hvec) == 0.0) |
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greg |
1.14 |
return("view up parallel to view direction"); |
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greg |
1.1 |
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greg |
1.5 |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
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greg |
1.12 |
if (v->horiz <= FTINY) |
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return(ill_horiz); |
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if (v->vert <= FTINY) |
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return(ill_vert); |
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switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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greg |
1.5 |
v->hn2 = v->horiz; |
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greg |
1.12 |
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); |
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if (v->vert >= 180.0-FTINY) |
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return(ill_vert); |
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greg |
1.5 |
v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
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greg |
1.12 |
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 / 90.0; |
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v->vn2 = v->vert / 90.0; |
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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); |
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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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greg |
1.1 |
return("unknown view type"); |
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greg |
1.12 |
} |
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greg |
1.13 |
if (v->type != VT_ANG) { |
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greg |
1.12 |
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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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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greg |
1.5 |
v->hn2 *= v->hn2; |
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v->vn2 *= v->vn2; |
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greg |
1.1 |
|
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return(NULL); |
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} |
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greg |
1.7 |
normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
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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) */ |
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greg |
1.6 |
{ |
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if (*ap <= FTINY) |
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greg |
1.7 |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
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greg |
1.6 |
else if (va * *xp > *ap * *yp) |
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greg |
1.10 |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
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greg |
1.6 |
else |
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greg |
1.10 |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
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greg |
1.6 |
} |
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greg |
1.5 |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
107 |
greg |
1.1 |
FVECT orig, direc; |
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register VIEW *v; |
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double x, y; |
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{ |
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greg |
1.12 |
double d, z; |
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greg |
1.5 |
x += v->hoff - 0.5; |
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y += v->voff - 0.5; |
115 |
greg |
1.1 |
|
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greg |
1.12 |
switch(v->type) { |
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case VT_PAR: /* parallel view */ |
118 |
greg |
1.5 |
orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0]; |
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orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1]; |
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orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2]; |
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greg |
1.1 |
VCOPY(direc, v->vdir); |
122 |
greg |
1.12 |
return(0); |
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case VT_PER: /* perspective view */ |
124 |
greg |
1.1 |
VCOPY(orig, v->vp); |
125 |
greg |
1.5 |
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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greg |
1.1 |
normalize(direc); |
129 |
greg |
1.12 |
return(0); |
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case VT_HEM: /* hemispherical fisheye */ |
131 |
greg |
1.13 |
z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
132 |
greg |
1.12 |
if (z < 0.0) |
133 |
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return(-1); |
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z = sqrt(z); |
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VCOPY(orig, v->vp); |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
138 |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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return(0); |
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case VT_ANG: /* angular fisheye */ |
141 |
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x *= v->horiz/180.0; |
142 |
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y *= v->vert/180.0; |
143 |
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d = x*x + y*y; |
144 |
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if (d > 1.0) |
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return(-1); |
146 |
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VCOPY(orig, v->vp); |
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if (d <= FTINY) { |
148 |
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VCOPY(direc, v->vdir); |
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return(0); |
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} |
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d = sqrt(d); |
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z = cos(PI*d); |
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d = sqrt(1 - z*z)/d; |
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x *= d; |
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y *= d; |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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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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return(0); |
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greg |
1.1 |
} |
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greg |
1.12 |
return(-1); |
162 |
greg |
1.1 |
} |
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greg |
1.5 |
viewpixel(xp, yp, zp, v, p) /* find image location for point */ |
166 |
greg |
1.3 |
double *xp, *yp, *zp; |
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register VIEW *v; |
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FVECT p; |
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{ |
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double d; |
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FVECT disp; |
172 |
greg |
1.5 |
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greg |
1.3 |
disp[0] = p[0] - v->vp[0]; |
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disp[1] = p[1] - v->vp[1]; |
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disp[2] = p[2] - v->vp[2]; |
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greg |
1.12 |
switch (v->type) { |
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case VT_PAR: /* parallel view */ |
179 |
greg |
1.3 |
if (zp != NULL) |
180 |
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*zp = DOT(disp,v->vdir); |
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greg |
1.13 |
break; |
182 |
greg |
1.12 |
case VT_PER: /* perspective view */ |
183 |
greg |
1.11 |
d = DOT(disp,v->vdir); |
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greg |
1.3 |
if (zp != NULL) { |
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*zp = sqrt(DOT(disp,disp)); |
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if (d < 0.0) |
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*zp = -*zp; |
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} |
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greg |
1.11 |
if (d < 0.0) /* fold pyramid */ |
190 |
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d = -d; |
191 |
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if (d > FTINY) { |
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d = 1.0/d; |
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disp[0] *= d; |
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disp[1] *= d; |
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disp[2] *= d; |
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} |
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greg |
1.13 |
break; |
198 |
greg |
1.12 |
case VT_HEM: /* hemispherical fisheye */ |
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d = normalize(disp); |
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if (zp != NULL) { |
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if (DOT(disp,v->vdir) < 0.0) |
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*zp = -d; |
203 |
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else |
204 |
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*zp = d; |
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} |
206 |
greg |
1.13 |
break; |
207 |
greg |
1.12 |
case VT_ANG: /* angular fisheye */ |
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d = normalize(disp); |
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if (zp != NULL) |
210 |
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*zp = d; |
211 |
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*xp = 0.5 - v->hoff; |
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*yp = 0.5 - v->voff; |
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d = DOT(disp,v->vdir); |
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if (d >= 1.0-FTINY) |
215 |
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return; |
216 |
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if (d <= -(1.0-FTINY)) { |
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*xp += 180.0/v->horiz; |
218 |
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*yp += 180.0/v->vert; |
219 |
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return; |
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} |
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d = acos(d)/PI / sqrt(1.0 - d*d); |
222 |
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*xp += DOT(disp,v->hvec)*d*180.0/v->horiz; |
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*yp += DOT(disp,v->vvec)*d*180.0/v->vert; |
224 |
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return; |
225 |
greg |
1.3 |
} |
226 |
greg |
1.13 |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
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*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
228 |
greg |
1.3 |
} |
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230 |
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greg |
1.5 |
int |
232 |
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getviewopt(v, ac, av) /* process view argument */ |
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register VIEW *v; |
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int ac; |
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register char *av[]; |
236 |
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{ |
237 |
greg |
1.16 |
#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
238 |
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badarg(ac-1,av+1,l)) return(-1) |
239 |
greg |
1.5 |
extern double atof(); |
240 |
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241 |
greg |
1.9 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
242 |
greg |
1.5 |
return(-1); |
243 |
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switch (av[0][2]) { |
244 |
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case 't': /* type */ |
245 |
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if (!av[0][3] || av[0][3]==' ') |
246 |
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return(-1); |
247 |
greg |
1.16 |
check(4,""); |
248 |
greg |
1.5 |
v->type = av[0][3]; |
249 |
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return(0); |
250 |
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case 'p': /* point */ |
251 |
greg |
1.16 |
check(3,"fff"); |
252 |
greg |
1.5 |
v->vp[0] = atof(av[1]); |
253 |
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v->vp[1] = atof(av[2]); |
254 |
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v->vp[2] = atof(av[3]); |
255 |
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return(3); |
256 |
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case 'd': /* direction */ |
257 |
greg |
1.16 |
check(3,"fff"); |
258 |
greg |
1.5 |
v->vdir[0] = atof(av[1]); |
259 |
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v->vdir[1] = atof(av[2]); |
260 |
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v->vdir[2] = atof(av[3]); |
261 |
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return(3); |
262 |
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case 'u': /* up */ |
263 |
greg |
1.16 |
check(3,"fff"); |
264 |
greg |
1.5 |
v->vup[0] = atof(av[1]); |
265 |
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v->vup[1] = atof(av[2]); |
266 |
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v->vup[2] = atof(av[3]); |
267 |
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return(3); |
268 |
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case 'h': /* horizontal size */ |
269 |
greg |
1.16 |
check(3,"f"); |
270 |
greg |
1.5 |
v->horiz = atof(av[1]); |
271 |
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return(1); |
272 |
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case 'v': /* vertical size */ |
273 |
greg |
1.16 |
check(3,"f"); |
274 |
greg |
1.5 |
v->vert = atof(av[1]); |
275 |
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return(1); |
276 |
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case 's': /* shift */ |
277 |
greg |
1.16 |
check(3,"f"); |
278 |
greg |
1.5 |
v->hoff = atof(av[1]); |
279 |
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return(1); |
280 |
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case 'l': /* lift */ |
281 |
greg |
1.16 |
check(3,"f"); |
282 |
greg |
1.5 |
v->voff = atof(av[1]); |
283 |
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return(1); |
284 |
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default: |
285 |
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return(-1); |
286 |
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} |
287 |
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#undef check |
288 |
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} |
289 |
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290 |
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291 |
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int |
292 |
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sscanview(vp, s) /* get view parameters from string */ |
293 |
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VIEW *vp; |
294 |
greg |
1.1 |
register char *s; |
295 |
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{ |
296 |
greg |
1.5 |
int ac; |
297 |
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char *av[4]; |
298 |
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int na; |
299 |
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int nvopts = 0; |
300 |
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301 |
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while (*s == ' ') |
302 |
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s++; |
303 |
greg |
1.9 |
while (*s) { |
304 |
greg |
1.5 |
ac = 0; |
305 |
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do { |
306 |
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av[ac++] = s; |
307 |
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while (*s && *s != ' ') |
308 |
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s++; |
309 |
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while (*s == ' ') |
310 |
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s++; |
311 |
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} while (*s && ac < 4); |
312 |
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if ((na = getviewopt(vp, ac, av)) >= 0) { |
313 |
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if (na+1 < ac) |
314 |
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s = av[na+1]; |
315 |
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nvopts++; |
316 |
greg |
1.9 |
} else if (ac > 1) |
317 |
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s = av[1]; |
318 |
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} |
319 |
greg |
1.5 |
return(nvopts); |
320 |
greg |
1.1 |
} |
321 |
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322 |
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323 |
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fprintview(vp, fp) /* write out view parameters */ |
324 |
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register VIEW *vp; |
325 |
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FILE *fp; |
326 |
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{ |
327 |
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fprintf(fp, " -vt%c", vp->type); |
328 |
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fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
329 |
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fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
330 |
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fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
331 |
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fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
332 |
greg |
1.9 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
333 |
greg |
1.1 |
} |
334 |
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335 |
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336 |
greg |
1.3 |
static char *altname[] = {NULL,"rpict","rview","pinterp",VIEWSTR,NULL}; |
337 |
greg |
1.1 |
|
338 |
greg |
1.15 |
struct myview { |
339 |
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VIEW *hv; |
340 |
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int ok; |
341 |
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}; |
342 |
greg |
1.1 |
|
343 |
greg |
1.15 |
|
344 |
greg |
1.1 |
static |
345 |
greg |
1.15 |
gethview(s, v) /* get view from header */ |
346 |
greg |
1.1 |
char *s; |
347 |
greg |
1.15 |
register struct myview *v; |
348 |
greg |
1.1 |
{ |
349 |
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register char **an; |
350 |
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|
351 |
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for (an = altname; *an != NULL; an++) |
352 |
|
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if (!strncmp(*an, s, strlen(*an))) { |
353 |
greg |
1.15 |
if (sscanview(v->hv, s+strlen(*an)) > 0) |
354 |
|
|
v->ok++; |
355 |
greg |
1.1 |
return; |
356 |
|
|
} |
357 |
|
|
} |
358 |
|
|
|
359 |
|
|
|
360 |
|
|
int |
361 |
greg |
1.8 |
viewfile(fname, vp, xp, yp) /* get view from file */ |
362 |
greg |
1.1 |
char *fname; |
363 |
|
|
VIEW *vp; |
364 |
greg |
1.8 |
int *xp, *yp; |
365 |
greg |
1.1 |
{ |
366 |
|
|
extern char *progname; |
367 |
greg |
1.15 |
struct myview mvs; |
368 |
greg |
1.1 |
FILE *fp; |
369 |
|
|
|
370 |
|
|
if ((fp = fopen(fname, "r")) == NULL) |
371 |
|
|
return(-1); |
372 |
|
|
|
373 |
|
|
altname[0] = progname; |
374 |
greg |
1.15 |
mvs.hv = vp; |
375 |
|
|
mvs.ok = 0; |
376 |
greg |
1.1 |
|
377 |
greg |
1.15 |
getheader(fp, gethview, &mvs); |
378 |
greg |
1.8 |
|
379 |
|
|
if (xp != NULL && yp != NULL |
380 |
|
|
&& fgetresolu(xp, yp, fp) == -1) |
381 |
greg |
1.15 |
mvs.ok = 0; |
382 |
greg |
1.1 |
|
383 |
|
|
fclose(fp); |
384 |
|
|
|
385 |
greg |
1.15 |
return(mvs.ok); |
386 |
greg |
1.1 |
} |