1 |
greg |
2.7 |
/* Copyright (c) 1994 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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greg |
2.4 |
#include "paths.h" |
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21 |
greg |
1.5 |
VIEW stdview = STDVIEW; /* default view parameters */ |
22 |
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 |
{ |
28 |
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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31 |
greg |
2.7 |
if (v->vfore < -FTINY || v->vaft < -FTINY || |
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(v->vaft > FTINY && v->vaft <= v->vfore)) |
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return("illegal fore/aft clipping plane"); |
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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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43 |
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if (normalize(v->hvec) == 0.0) |
44 |
greg |
1.14 |
return("view up parallel to view direction"); |
45 |
greg |
1.1 |
|
46 |
greg |
1.5 |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
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48 |
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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53 |
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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; |
56 |
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); |
63 |
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"); |
84 |
greg |
1.12 |
} |
85 |
greg |
1.13 |
if (v->type != VT_ANG) { |
86 |
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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} |
93 |
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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100 |
greg |
1.7 |
normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
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double va; /* view aspect ratio */ |
102 |
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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) */ |
104 |
greg |
1.6 |
{ |
105 |
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if (*ap <= FTINY) |
106 |
greg |
1.7 |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
107 |
greg |
1.6 |
else if (va * *xp > *ap * *yp) |
108 |
greg |
1.10 |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
109 |
greg |
1.6 |
else |
110 |
greg |
1.10 |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
111 |
greg |
1.6 |
} |
112 |
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113 |
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114 |
greg |
2.7 |
double |
115 |
greg |
1.5 |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
116 |
greg |
1.1 |
FVECT orig, direc; |
117 |
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register VIEW *v; |
118 |
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double x, y; |
119 |
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{ |
120 |
greg |
1.12 |
double d, z; |
121 |
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122 |
greg |
1.5 |
x += v->hoff - 0.5; |
123 |
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y += v->voff - 0.5; |
124 |
greg |
1.1 |
|
125 |
greg |
1.12 |
switch(v->type) { |
126 |
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case VT_PAR: /* parallel view */ |
127 |
greg |
2.7 |
orig[0] = v->vp[0] + v->vfore*v->vdir[0] |
128 |
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+ x*v->hvec[0] + y*v->vvec[0]; |
129 |
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orig[1] = v->vp[1] + v->vfore*v->vdir[1] |
130 |
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+ x*v->hvec[1] + y*v->vvec[1]; |
131 |
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orig[2] = v->vp[2] + v->vfore*v->vdir[2] |
132 |
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+ x*v->hvec[2] + y*v->vvec[2]; |
133 |
greg |
1.1 |
VCOPY(direc, v->vdir); |
134 |
greg |
2.8 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
135 |
greg |
1.12 |
case VT_PER: /* perspective view */ |
136 |
greg |
1.5 |
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
137 |
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direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
138 |
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direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
139 |
greg |
2.7 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
140 |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
141 |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
142 |
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d = normalize(direc); |
143 |
greg |
2.8 |
return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
144 |
greg |
1.12 |
case VT_HEM: /* hemispherical fisheye */ |
145 |
greg |
1.13 |
z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
146 |
greg |
1.12 |
if (z < 0.0) |
147 |
greg |
2.7 |
return(-1.0); |
148 |
greg |
1.12 |
z = sqrt(z); |
149 |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
150 |
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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]; |
152 |
greg |
2.7 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
153 |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
154 |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
155 |
greg |
2.8 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
156 |
greg |
1.12 |
case VT_ANG: /* angular fisheye */ |
157 |
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x *= v->horiz/180.0; |
158 |
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y *= v->vert/180.0; |
159 |
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d = x*x + y*y; |
160 |
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if (d > 1.0) |
161 |
greg |
2.7 |
return(-1.0); |
162 |
greg |
1.12 |
d = sqrt(d); |
163 |
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z = cos(PI*d); |
164 |
greg |
2.6 |
d = d <= FTINY ? PI : sqrt(1 - z*z)/d; |
165 |
greg |
1.12 |
x *= d; |
166 |
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y *= d; |
167 |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
168 |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
169 |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
170 |
greg |
2.7 |
orig[0] = v->vp[0] + v->vfore*direc[0]; |
171 |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
172 |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
173 |
greg |
2.8 |
return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
174 |
greg |
1.1 |
} |
175 |
greg |
2.7 |
return(-1.0); |
176 |
greg |
1.1 |
} |
177 |
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178 |
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179 |
greg |
1.17 |
viewloc(ip, v, p) /* find image location for point */ |
180 |
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FVECT ip; |
181 |
greg |
1.3 |
register VIEW *v; |
182 |
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FVECT p; |
183 |
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{ |
184 |
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double d; |
185 |
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FVECT disp; |
186 |
greg |
1.5 |
|
187 |
greg |
1.3 |
disp[0] = p[0] - v->vp[0]; |
188 |
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disp[1] = p[1] - v->vp[1]; |
189 |
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disp[2] = p[2] - v->vp[2]; |
190 |
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191 |
greg |
1.12 |
switch (v->type) { |
192 |
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case VT_PAR: /* parallel view */ |
193 |
greg |
2.7 |
ip[2] = DOT(disp,v->vdir) - v->vfore; |
194 |
greg |
1.13 |
break; |
195 |
greg |
1.12 |
case VT_PER: /* perspective view */ |
196 |
greg |
1.11 |
d = DOT(disp,v->vdir); |
197 |
greg |
1.17 |
ip[2] = sqrt(DOT(disp,disp)); |
198 |
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if (d < 0.0) { /* fold pyramid */ |
199 |
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ip[2] = -ip[2]; |
200 |
greg |
1.11 |
d = -d; |
201 |
greg |
2.7 |
} |
202 |
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if (d > FTINY) { |
203 |
greg |
1.11 |
d = 1.0/d; |
204 |
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disp[0] *= d; |
205 |
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disp[1] *= d; |
206 |
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disp[2] *= d; |
207 |
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} |
208 |
greg |
2.7 |
ip[2] *= (1.0 - v->vfore*d); |
209 |
greg |
1.13 |
break; |
210 |
greg |
1.12 |
case VT_HEM: /* hemispherical fisheye */ |
211 |
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d = normalize(disp); |
212 |
greg |
1.17 |
if (DOT(disp,v->vdir) < 0.0) |
213 |
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ip[2] = -d; |
214 |
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else |
215 |
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ip[2] = d; |
216 |
greg |
2.7 |
ip[2] -= v->vfore; |
217 |
greg |
1.13 |
break; |
218 |
greg |
1.12 |
case VT_ANG: /* angular fisheye */ |
219 |
greg |
1.17 |
ip[0] = 0.5 - v->hoff; |
220 |
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ip[1] = 0.5 - v->voff; |
221 |
greg |
2.7 |
ip[2] = normalize(disp) - v->vfore; |
222 |
greg |
1.12 |
d = DOT(disp,v->vdir); |
223 |
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if (d >= 1.0-FTINY) |
224 |
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return; |
225 |
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if (d <= -(1.0-FTINY)) { |
226 |
greg |
2.7 |
ip[0] += 180.0/v->horiz; |
227 |
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ip[1] += 180.0/v->vert; |
228 |
greg |
1.12 |
return; |
229 |
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} |
230 |
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d = acos(d)/PI / sqrt(1.0 - d*d); |
231 |
greg |
1.17 |
ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz; |
232 |
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ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert; |
233 |
greg |
1.12 |
return; |
234 |
greg |
1.3 |
} |
235 |
greg |
1.17 |
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
236 |
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ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
237 |
greg |
1.3 |
} |
238 |
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239 |
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240 |
greg |
1.17 |
pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */ |
241 |
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FLOAT loc[2]; |
242 |
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register RESOLU *rp; |
243 |
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int px, py; |
244 |
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{ |
245 |
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register int x, y; |
246 |
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247 |
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if (rp->or & YMAJOR) { |
248 |
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x = px; |
249 |
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y = py; |
250 |
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} else { |
251 |
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x = py; |
252 |
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y = px; |
253 |
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} |
254 |
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if (rp->or & XDECR) |
255 |
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x = rp->xr-1 - x; |
256 |
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if (rp->or & YDECR) |
257 |
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y = rp->yr-1 - y; |
258 |
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loc[0] = (x+.5)/rp->xr; |
259 |
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loc[1] = (y+.5)/rp->yr; |
260 |
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} |
261 |
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262 |
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263 |
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loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */ |
264 |
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int pp[2]; |
265 |
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register RESOLU *rp; |
266 |
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double lx, ly; |
267 |
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{ |
268 |
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register int x, y; |
269 |
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270 |
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x = lx * rp->xr; |
271 |
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y = ly * rp->yr; |
272 |
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if (rp->or & XDECR) |
273 |
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x = rp->xr-1 - x; |
274 |
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if (rp->or & YDECR) |
275 |
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y = rp->yr-1 - y; |
276 |
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if (rp->or & YMAJOR) { |
277 |
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pp[0] = x; |
278 |
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pp[1] = y; |
279 |
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} else { |
280 |
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pp[0] = y; |
281 |
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pp[1] = x; |
282 |
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} |
283 |
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} |
284 |
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285 |
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286 |
greg |
1.5 |
int |
287 |
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getviewopt(v, ac, av) /* process view argument */ |
288 |
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register VIEW *v; |
289 |
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int ac; |
290 |
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register char *av[]; |
291 |
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{ |
292 |
greg |
1.16 |
#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
293 |
|
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badarg(ac-1,av+1,l)) return(-1) |
294 |
greg |
1.5 |
|
295 |
greg |
1.9 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
296 |
greg |
1.5 |
return(-1); |
297 |
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switch (av[0][2]) { |
298 |
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case 't': /* type */ |
299 |
|
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if (!av[0][3] || av[0][3]==' ') |
300 |
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return(-1); |
301 |
greg |
1.16 |
check(4,""); |
302 |
greg |
1.5 |
v->type = av[0][3]; |
303 |
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return(0); |
304 |
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case 'p': /* point */ |
305 |
greg |
1.16 |
check(3,"fff"); |
306 |
greg |
1.5 |
v->vp[0] = atof(av[1]); |
307 |
|
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v->vp[1] = atof(av[2]); |
308 |
|
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v->vp[2] = atof(av[3]); |
309 |
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return(3); |
310 |
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case 'd': /* direction */ |
311 |
greg |
1.16 |
check(3,"fff"); |
312 |
greg |
1.5 |
v->vdir[0] = atof(av[1]); |
313 |
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v->vdir[1] = atof(av[2]); |
314 |
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v->vdir[2] = atof(av[3]); |
315 |
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return(3); |
316 |
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case 'u': /* up */ |
317 |
greg |
1.16 |
check(3,"fff"); |
318 |
greg |
1.5 |
v->vup[0] = atof(av[1]); |
319 |
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v->vup[1] = atof(av[2]); |
320 |
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v->vup[2] = atof(av[3]); |
321 |
|
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return(3); |
322 |
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case 'h': /* horizontal size */ |
323 |
greg |
1.16 |
check(3,"f"); |
324 |
greg |
1.5 |
v->horiz = atof(av[1]); |
325 |
|
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return(1); |
326 |
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case 'v': /* vertical size */ |
327 |
greg |
1.16 |
check(3,"f"); |
328 |
greg |
1.5 |
v->vert = atof(av[1]); |
329 |
|
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return(1); |
330 |
greg |
2.7 |
case 'o': /* fore clipping plane */ |
331 |
|
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check(3,"f"); |
332 |
|
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v->vfore = atof(av[1]); |
333 |
|
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return(1); |
334 |
|
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case 'a': /* aft clipping plane */ |
335 |
|
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check(3,"f"); |
336 |
|
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v->vaft = atof(av[1]); |
337 |
|
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return(1); |
338 |
greg |
1.5 |
case 's': /* shift */ |
339 |
greg |
1.16 |
check(3,"f"); |
340 |
greg |
1.5 |
v->hoff = atof(av[1]); |
341 |
|
|
return(1); |
342 |
|
|
case 'l': /* lift */ |
343 |
greg |
1.16 |
check(3,"f"); |
344 |
greg |
1.5 |
v->voff = atof(av[1]); |
345 |
|
|
return(1); |
346 |
|
|
default: |
347 |
|
|
return(-1); |
348 |
|
|
} |
349 |
|
|
#undef check |
350 |
|
|
} |
351 |
|
|
|
352 |
|
|
|
353 |
|
|
int |
354 |
|
|
sscanview(vp, s) /* get view parameters from string */ |
355 |
|
|
VIEW *vp; |
356 |
greg |
1.1 |
register char *s; |
357 |
|
|
{ |
358 |
greg |
1.5 |
int ac; |
359 |
|
|
char *av[4]; |
360 |
|
|
int na; |
361 |
|
|
int nvopts = 0; |
362 |
|
|
|
363 |
greg |
2.3 |
if (*s != '-') |
364 |
|
|
s = sskip(s); |
365 |
greg |
1.9 |
while (*s) { |
366 |
greg |
1.5 |
ac = 0; |
367 |
|
|
do { |
368 |
|
|
av[ac++] = s; |
369 |
|
|
while (*s && *s != ' ') |
370 |
|
|
s++; |
371 |
|
|
while (*s == ' ') |
372 |
|
|
s++; |
373 |
|
|
} while (*s && ac < 4); |
374 |
|
|
if ((na = getviewopt(vp, ac, av)) >= 0) { |
375 |
|
|
if (na+1 < ac) |
376 |
|
|
s = av[na+1]; |
377 |
|
|
nvopts++; |
378 |
greg |
1.9 |
} else if (ac > 1) |
379 |
|
|
s = av[1]; |
380 |
|
|
} |
381 |
greg |
1.5 |
return(nvopts); |
382 |
greg |
1.1 |
} |
383 |
|
|
|
384 |
|
|
|
385 |
|
|
fprintview(vp, fp) /* write out view parameters */ |
386 |
|
|
register VIEW *vp; |
387 |
|
|
FILE *fp; |
388 |
|
|
{ |
389 |
|
|
fprintf(fp, " -vt%c", vp->type); |
390 |
|
|
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
391 |
|
|
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
392 |
|
|
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
393 |
|
|
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
394 |
greg |
2.7 |
fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
395 |
greg |
1.9 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
396 |
greg |
1.1 |
} |
397 |
|
|
|
398 |
|
|
|
399 |
greg |
2.3 |
int |
400 |
|
|
isview(s) /* is this a view string? */ |
401 |
|
|
char *s; |
402 |
|
|
{ |
403 |
greg |
2.5 |
static char *altname[]={NULL,VIEWSTR,"rpict","rview","pinterp",NULL}; |
404 |
|
|
extern char *progname; |
405 |
greg |
2.3 |
register char *cp; |
406 |
|
|
register char **an; |
407 |
|
|
/* add program name to list */ |
408 |
greg |
2.5 |
if (altname[0] == NULL) { |
409 |
|
|
for (cp = progname; *cp; cp++) |
410 |
|
|
; |
411 |
|
|
while (cp > progname && !ISDIRSEP(cp[-1])) |
412 |
|
|
cp--; |
413 |
|
|
altname[0] = cp; |
414 |
|
|
} |
415 |
greg |
2.3 |
/* skip leading path */ |
416 |
|
|
cp = s; |
417 |
|
|
while (*cp && *cp != ' ') |
418 |
|
|
cp++; |
419 |
greg |
2.5 |
while (cp > s && !ISDIRSEP(cp[-1])) |
420 |
greg |
2.3 |
cp--; |
421 |
|
|
for (an = altname; *an != NULL; an++) |
422 |
|
|
if (!strncmp(*an, cp, strlen(*an))) |
423 |
|
|
return(1); |
424 |
|
|
return(0); |
425 |
|
|
} |
426 |
greg |
1.1 |
|
427 |
greg |
2.3 |
|
428 |
greg |
1.15 |
struct myview { |
429 |
|
|
VIEW *hv; |
430 |
|
|
int ok; |
431 |
|
|
}; |
432 |
greg |
1.1 |
|
433 |
greg |
1.15 |
|
434 |
greg |
1.1 |
static |
435 |
greg |
1.15 |
gethview(s, v) /* get view from header */ |
436 |
greg |
1.1 |
char *s; |
437 |
greg |
1.15 |
register struct myview *v; |
438 |
greg |
1.1 |
{ |
439 |
greg |
2.3 |
if (isview(s) && sscanview(v->hv, s) > 0) |
440 |
|
|
v->ok++; |
441 |
greg |
1.1 |
} |
442 |
|
|
|
443 |
|
|
|
444 |
|
|
int |
445 |
greg |
1.17 |
viewfile(fname, vp, rp) /* get view from file */ |
446 |
greg |
1.1 |
char *fname; |
447 |
|
|
VIEW *vp; |
448 |
greg |
1.17 |
RESOLU *rp; |
449 |
greg |
1.1 |
{ |
450 |
greg |
1.15 |
struct myview mvs; |
451 |
greg |
1.1 |
FILE *fp; |
452 |
|
|
|
453 |
|
|
if ((fp = fopen(fname, "r")) == NULL) |
454 |
|
|
return(-1); |
455 |
|
|
|
456 |
greg |
1.15 |
mvs.hv = vp; |
457 |
|
|
mvs.ok = 0; |
458 |
greg |
1.1 |
|
459 |
greg |
1.15 |
getheader(fp, gethview, &mvs); |
460 |
greg |
1.8 |
|
461 |
greg |
1.17 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
462 |
greg |
1.15 |
mvs.ok = 0; |
463 |
greg |
1.1 |
|
464 |
|
|
fclose(fp); |
465 |
|
|
|
466 |
greg |
1.15 |
return(mvs.ok); |
467 |
greg |
1.1 |
} |