1 |
greg |
1.17 |
/* Copyright (c) 1991 Regents of the University of California */ |
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greg |
1.1 |
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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 |
1.17 |
#include "resolu.h" |
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19 |
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 |
|
40 |
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); |
57 |
greg |
1.5 |
v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
58 |
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) |
100 |
greg |
1.7 |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
101 |
greg |
1.6 |
else if (va * *xp > *ap * *yp) |
102 |
greg |
1.10 |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
103 |
greg |
1.6 |
else |
104 |
greg |
1.10 |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
105 |
greg |
1.6 |
} |
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108 |
greg |
1.5 |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
109 |
greg |
1.1 |
FVECT orig, direc; |
110 |
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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; |
114 |
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115 |
greg |
1.5 |
x += v->hoff - 0.5; |
116 |
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y += v->voff - 0.5; |
117 |
greg |
1.1 |
|
118 |
greg |
1.12 |
switch(v->type) { |
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case VT_PAR: /* parallel view */ |
120 |
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]; |
123 |
greg |
1.1 |
VCOPY(direc, v->vdir); |
124 |
greg |
1.12 |
return(0); |
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case VT_PER: /* perspective view */ |
126 |
greg |
1.1 |
VCOPY(orig, v->vp); |
127 |
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]; |
130 |
greg |
1.1 |
normalize(direc); |
131 |
greg |
1.12 |
return(0); |
132 |
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case VT_HEM: /* hemispherical fisheye */ |
133 |
greg |
1.13 |
z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
134 |
greg |
1.12 |
if (z < 0.0) |
135 |
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return(-1); |
136 |
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z = sqrt(z); |
137 |
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VCOPY(orig, v->vp); |
138 |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
139 |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
140 |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
141 |
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return(0); |
142 |
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case VT_ANG: /* angular fisheye */ |
143 |
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x *= v->horiz/180.0; |
144 |
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y *= v->vert/180.0; |
145 |
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d = x*x + y*y; |
146 |
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if (d > 1.0) |
147 |
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return(-1); |
148 |
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VCOPY(orig, v->vp); |
149 |
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if (d <= FTINY) { |
150 |
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VCOPY(direc, v->vdir); |
151 |
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return(0); |
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} |
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d = sqrt(d); |
154 |
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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); |
162 |
greg |
1.1 |
} |
163 |
greg |
1.12 |
return(-1); |
164 |
greg |
1.1 |
} |
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166 |
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167 |
greg |
1.17 |
viewloc(ip, v, p) /* find image location for point */ |
168 |
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FVECT ip; |
169 |
greg |
1.3 |
register VIEW *v; |
170 |
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FVECT p; |
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{ |
172 |
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double d; |
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FVECT disp; |
174 |
greg |
1.5 |
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175 |
greg |
1.3 |
disp[0] = p[0] - v->vp[0]; |
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disp[1] = p[1] - v->vp[1]; |
177 |
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disp[2] = p[2] - v->vp[2]; |
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179 |
greg |
1.12 |
switch (v->type) { |
180 |
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case VT_PAR: /* parallel view */ |
181 |
greg |
1.17 |
ip[2] = DOT(disp,v->vdir); |
182 |
greg |
1.13 |
break; |
183 |
greg |
1.12 |
case VT_PER: /* perspective view */ |
184 |
greg |
1.11 |
d = DOT(disp,v->vdir); |
185 |
greg |
1.17 |
ip[2] = sqrt(DOT(disp,disp)); |
186 |
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if (d < 0.0) { /* fold pyramid */ |
187 |
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ip[2] = -ip[2]; |
188 |
greg |
1.11 |
d = -d; |
189 |
greg |
1.17 |
} else if (d > FTINY) { |
190 |
greg |
1.11 |
d = 1.0/d; |
191 |
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disp[0] *= d; |
192 |
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disp[1] *= d; |
193 |
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disp[2] *= d; |
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} |
195 |
greg |
1.13 |
break; |
196 |
greg |
1.12 |
case VT_HEM: /* hemispherical fisheye */ |
197 |
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d = normalize(disp); |
198 |
greg |
1.17 |
if (DOT(disp,v->vdir) < 0.0) |
199 |
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ip[2] = -d; |
200 |
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else |
201 |
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ip[2] = d; |
202 |
greg |
1.13 |
break; |
203 |
greg |
1.12 |
case VT_ANG: /* angular fisheye */ |
204 |
greg |
1.17 |
ip[0] = 0.5 - v->hoff; |
205 |
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ip[1] = 0.5 - v->voff; |
206 |
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ip[2] = normalize(disp); |
207 |
greg |
1.12 |
d = DOT(disp,v->vdir); |
208 |
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if (d >= 1.0-FTINY) |
209 |
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return; |
210 |
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if (d <= -(1.0-FTINY)) { |
211 |
greg |
1.17 |
ip[1] += 180.0/v->horiz; |
212 |
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ip[2] += 180.0/v->vert; |
213 |
greg |
1.12 |
return; |
214 |
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} |
215 |
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d = acos(d)/PI / sqrt(1.0 - d*d); |
216 |
greg |
1.17 |
ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz; |
217 |
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ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert; |
218 |
greg |
1.12 |
return; |
219 |
greg |
1.3 |
} |
220 |
greg |
1.17 |
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
221 |
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ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
222 |
greg |
1.3 |
} |
223 |
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224 |
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225 |
greg |
1.17 |
pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */ |
226 |
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FLOAT loc[2]; |
227 |
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register RESOLU *rp; |
228 |
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int px, py; |
229 |
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{ |
230 |
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register int x, y; |
231 |
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232 |
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if (rp->or & YMAJOR) { |
233 |
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x = px; |
234 |
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y = py; |
235 |
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} else { |
236 |
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x = py; |
237 |
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y = px; |
238 |
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} |
239 |
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if (rp->or & XDECR) |
240 |
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x = rp->xr-1 - x; |
241 |
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if (rp->or & YDECR) |
242 |
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y = rp->yr-1 - y; |
243 |
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loc[0] = (x+.5)/rp->xr; |
244 |
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loc[1] = (y+.5)/rp->yr; |
245 |
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} |
246 |
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247 |
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248 |
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loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */ |
249 |
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int pp[2]; |
250 |
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register RESOLU *rp; |
251 |
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double lx, ly; |
252 |
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{ |
253 |
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register int x, y; |
254 |
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255 |
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x = lx * rp->xr; |
256 |
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y = ly * rp->yr; |
257 |
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if (rp->or & XDECR) |
258 |
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x = rp->xr-1 - x; |
259 |
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if (rp->or & YDECR) |
260 |
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y = rp->yr-1 - y; |
261 |
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if (rp->or & YMAJOR) { |
262 |
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pp[0] = x; |
263 |
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pp[1] = y; |
264 |
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} else { |
265 |
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pp[0] = y; |
266 |
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pp[1] = x; |
267 |
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} |
268 |
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} |
269 |
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270 |
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271 |
greg |
1.5 |
int |
272 |
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getviewopt(v, ac, av) /* process view argument */ |
273 |
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register VIEW *v; |
274 |
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int ac; |
275 |
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register char *av[]; |
276 |
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{ |
277 |
greg |
1.16 |
#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
278 |
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badarg(ac-1,av+1,l)) return(-1) |
279 |
greg |
1.5 |
|
280 |
greg |
1.9 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
281 |
greg |
1.5 |
return(-1); |
282 |
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switch (av[0][2]) { |
283 |
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case 't': /* type */ |
284 |
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if (!av[0][3] || av[0][3]==' ') |
285 |
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return(-1); |
286 |
greg |
1.16 |
check(4,""); |
287 |
greg |
1.5 |
v->type = av[0][3]; |
288 |
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return(0); |
289 |
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case 'p': /* point */ |
290 |
greg |
1.16 |
check(3,"fff"); |
291 |
greg |
1.5 |
v->vp[0] = atof(av[1]); |
292 |
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v->vp[1] = atof(av[2]); |
293 |
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v->vp[2] = atof(av[3]); |
294 |
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return(3); |
295 |
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case 'd': /* direction */ |
296 |
greg |
1.16 |
check(3,"fff"); |
297 |
greg |
1.5 |
v->vdir[0] = atof(av[1]); |
298 |
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v->vdir[1] = atof(av[2]); |
299 |
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v->vdir[2] = atof(av[3]); |
300 |
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return(3); |
301 |
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case 'u': /* up */ |
302 |
greg |
1.16 |
check(3,"fff"); |
303 |
greg |
1.5 |
v->vup[0] = atof(av[1]); |
304 |
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v->vup[1] = atof(av[2]); |
305 |
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v->vup[2] = atof(av[3]); |
306 |
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return(3); |
307 |
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case 'h': /* horizontal size */ |
308 |
greg |
1.16 |
check(3,"f"); |
309 |
greg |
1.5 |
v->horiz = atof(av[1]); |
310 |
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return(1); |
311 |
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case 'v': /* vertical size */ |
312 |
greg |
1.16 |
check(3,"f"); |
313 |
greg |
1.5 |
v->vert = atof(av[1]); |
314 |
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return(1); |
315 |
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case 's': /* shift */ |
316 |
greg |
1.16 |
check(3,"f"); |
317 |
greg |
1.5 |
v->hoff = atof(av[1]); |
318 |
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return(1); |
319 |
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case 'l': /* lift */ |
320 |
greg |
1.16 |
check(3,"f"); |
321 |
greg |
1.5 |
v->voff = atof(av[1]); |
322 |
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return(1); |
323 |
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default: |
324 |
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return(-1); |
325 |
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} |
326 |
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#undef check |
327 |
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} |
328 |
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329 |
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330 |
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int |
331 |
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sscanview(vp, s) /* get view parameters from string */ |
332 |
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VIEW *vp; |
333 |
greg |
1.1 |
register char *s; |
334 |
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{ |
335 |
greg |
1.5 |
int ac; |
336 |
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char *av[4]; |
337 |
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int na; |
338 |
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int nvopts = 0; |
339 |
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340 |
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while (*s == ' ') |
341 |
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s++; |
342 |
greg |
1.9 |
while (*s) { |
343 |
greg |
1.5 |
ac = 0; |
344 |
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do { |
345 |
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av[ac++] = s; |
346 |
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while (*s && *s != ' ') |
347 |
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s++; |
348 |
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while (*s == ' ') |
349 |
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s++; |
350 |
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} while (*s && ac < 4); |
351 |
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if ((na = getviewopt(vp, ac, av)) >= 0) { |
352 |
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if (na+1 < ac) |
353 |
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s = av[na+1]; |
354 |
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nvopts++; |
355 |
greg |
1.9 |
} else if (ac > 1) |
356 |
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s = av[1]; |
357 |
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} |
358 |
greg |
1.5 |
return(nvopts); |
359 |
greg |
1.1 |
} |
360 |
|
|
|
361 |
|
|
|
362 |
|
|
fprintview(vp, fp) /* write out view parameters */ |
363 |
|
|
register VIEW *vp; |
364 |
|
|
FILE *fp; |
365 |
|
|
{ |
366 |
|
|
fprintf(fp, " -vt%c", vp->type); |
367 |
|
|
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
368 |
|
|
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
369 |
|
|
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
370 |
|
|
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
371 |
greg |
1.9 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
372 |
greg |
1.1 |
} |
373 |
|
|
|
374 |
|
|
|
375 |
greg |
1.3 |
static char *altname[] = {NULL,"rpict","rview","pinterp",VIEWSTR,NULL}; |
376 |
greg |
1.1 |
|
377 |
greg |
1.15 |
struct myview { |
378 |
|
|
VIEW *hv; |
379 |
|
|
int ok; |
380 |
|
|
}; |
381 |
greg |
1.1 |
|
382 |
greg |
1.15 |
|
383 |
greg |
1.1 |
static |
384 |
greg |
1.15 |
gethview(s, v) /* get view from header */ |
385 |
greg |
1.1 |
char *s; |
386 |
greg |
1.15 |
register struct myview *v; |
387 |
greg |
1.1 |
{ |
388 |
|
|
register char **an; |
389 |
|
|
|
390 |
|
|
for (an = altname; *an != NULL; an++) |
391 |
|
|
if (!strncmp(*an, s, strlen(*an))) { |
392 |
greg |
1.15 |
if (sscanview(v->hv, s+strlen(*an)) > 0) |
393 |
|
|
v->ok++; |
394 |
greg |
1.1 |
return; |
395 |
|
|
} |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
|
399 |
|
|
int |
400 |
greg |
1.17 |
viewfile(fname, vp, rp) /* get view from file */ |
401 |
greg |
1.1 |
char *fname; |
402 |
|
|
VIEW *vp; |
403 |
greg |
1.17 |
RESOLU *rp; |
404 |
greg |
1.1 |
{ |
405 |
|
|
extern char *progname; |
406 |
greg |
1.15 |
struct myview mvs; |
407 |
greg |
1.1 |
FILE *fp; |
408 |
|
|
|
409 |
|
|
if ((fp = fopen(fname, "r")) == NULL) |
410 |
|
|
return(-1); |
411 |
|
|
|
412 |
|
|
altname[0] = progname; |
413 |
greg |
1.15 |
mvs.hv = vp; |
414 |
|
|
mvs.ok = 0; |
415 |
greg |
1.1 |
|
416 |
greg |
1.15 |
getheader(fp, gethview, &mvs); |
417 |
greg |
1.8 |
|
418 |
greg |
1.17 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
419 |
greg |
1.15 |
mvs.ok = 0; |
420 |
greg |
1.1 |
|
421 |
|
|
fclose(fp); |
422 |
|
|
|
423 |
greg |
1.15 |
return(mvs.ok); |
424 |
greg |
1.1 |
} |