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* 10/17/85 |
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*/ |
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|
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– |
#include <ctype.h> |
14 |
– |
|
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#include "standard.h" |
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|
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#include "view.h" |
16 |
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|
17 |
< |
VIEW stdview = STDVIEW(512); /* default view parameters */ |
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> |
VIEW stdview = STDVIEW; /* default view parameters */ |
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|
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|
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char * |
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< |
sskip(s) /* skip a word */ |
24 |
< |
register char *s; |
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< |
{ |
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< |
while (isspace(*s)) s++; |
27 |
< |
while (*s && !isspace(*s)) s++; |
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< |
return(s); |
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< |
} |
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|
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< |
|
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< |
char * |
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< |
setview(v) /* set vhinc and vvinc, return message on error */ |
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> |
setview(v) /* set hvec and vvec, return message on error */ |
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register VIEW *v; |
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{ |
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< |
double tan(), dt; |
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> |
static char ill_horiz[] = "illegal horizontal view size"; |
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> |
static char ill_vert[] = "illegal vertical view size"; |
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|
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if (normalize(v->vdir) == 0.0) /* normalize direction */ |
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return("zero view direction"); |
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|
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fcross(v->vhinc, v->vdir, v->vup); /* compute horiz dir */ |
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|
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< |
if (normalize(v->vhinc) == 0.0) |
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> |
fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
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|
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if (normalize(v->hvec) == 0.0) |
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return("illegal view up vector"); |
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|
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fcross(v->vvinc, v->vhinc, v->vdir); /* compute vert dir */ |
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|
35 |
< |
if (v->type == VT_PAR) |
49 |
< |
dt = v->horiz; |
50 |
< |
else if (v->type == VT_PER) |
51 |
< |
dt = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
52 |
< |
else |
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< |
return("unknown view type"); |
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> |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
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|
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< |
if (dt <= FTINY || dt >= FHUGE) |
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< |
return("illegal horizontal view size"); |
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> |
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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|
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< |
if (v->hresolu <= 0) |
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< |
return("illegal horizontal resolution"); |
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> |
switch (v->type) { |
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> |
case VT_PAR: /* parallel view */ |
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> |
v->hn2 = v->horiz; |
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> |
v->vn2 = v->vert; |
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> |
break; |
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> |
case VT_PER: /* perspective view */ |
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> |
if (v->horiz >= 180.0-FTINY) |
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> |
return(ill_horiz); |
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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 * tan(v->horiz*(PI/180.0/2.0)); |
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> |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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> |
break; |
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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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> |
return("unknown view type"); |
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} |
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> |
if (v->type == VT_PAR || v->type == VT_PER) { |
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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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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; |
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> |
v->vn2 *= v->vn2; |
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|
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< |
dt /= (double)v->hresolu; |
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< |
v->vhinc[0] *= dt; |
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< |
v->vhinc[1] *= dt; |
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v->vhinc[2] *= dt; |
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return(NULL); |
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} |
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|
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if (v->type == VT_PAR) |
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dt = v->vert; |
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else |
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dt = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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|
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if (dt <= FTINY || dt >= FHUGE) |
90 |
< |
return("illegal vertical view size"); |
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|
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if (v->vresolu <= 0) |
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< |
return("illegal vertical resolution"); |
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< |
|
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< |
dt /= (double)v->vresolu; |
96 |
< |
v->vvinc[0] *= dt; |
97 |
< |
v->vvinc[1] *= dt; |
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< |
v->vvinc[2] *= dt; |
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|
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v->vhs2 = 1.0/DOT(v->vhinc,v->vhinc); |
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< |
v->vvs2 = 1.0/DOT(v->vvinc,v->vvinc); |
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|
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< |
return(NULL); |
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> |
normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
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> |
double va; /* view aspect ratio */ |
91 |
> |
double *ap; /* pixel aspect in (or out if 0) */ |
92 |
> |
int *xp, *yp; /* x and y resolution in (or out if *ap!=0) */ |
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{ |
94 |
> |
if (*ap <= FTINY) |
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> |
*ap = va * *xp / *yp; /* compute pixel aspect */ |
96 |
> |
else if (va * *xp > *ap * *yp) |
97 |
> |
*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
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else |
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> |
*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
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} |
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|
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|
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rayview(orig, direc, v, x, y) /* compute ray origin and direction */ |
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> |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
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FVECT orig, direc; |
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register VIEW *v; |
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double x, y; |
107 |
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{ |
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< |
x -= 0.5 * v->hresolu; |
109 |
< |
y -= 0.5 * v->vresolu; |
108 |
> |
double d, z; |
109 |
> |
|
110 |
> |
x += v->hoff - 0.5; |
111 |
> |
y += v->voff - 0.5; |
112 |
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|
113 |
< |
if (v->type == VT_PAR) { /* parallel view */ |
114 |
< |
orig[0] = v->vp[0] + x*v->vhinc[0] + y*v->vvinc[0]; |
115 |
< |
orig[1] = v->vp[1] + x*v->vhinc[1] + y*v->vvinc[1]; |
116 |
< |
orig[2] = v->vp[2] + x*v->vhinc[2] + y*v->vvinc[2]; |
113 |
> |
switch(v->type) { |
114 |
> |
case VT_PAR: /* parallel view */ |
115 |
> |
orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0]; |
116 |
> |
orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1]; |
117 |
> |
orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2]; |
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|
VCOPY(direc, v->vdir); |
119 |
< |
} else { /* perspective view */ |
119 |
> |
return(0); |
120 |
> |
case VT_PER: /* perspective view */ |
121 |
|
VCOPY(orig, v->vp); |
122 |
< |
direc[0] = v->vdir[0] + x*v->vhinc[0] + y*v->vvinc[0]; |
123 |
< |
direc[1] = v->vdir[1] + x*v->vhinc[1] + y*v->vvinc[1]; |
124 |
< |
direc[2] = v->vdir[2] + x*v->vhinc[2] + y*v->vvinc[2]; |
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> |
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
123 |
> |
direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
124 |
> |
direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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normalize(direc); |
126 |
+ |
return(0); |
127 |
+ |
case VT_HEM: /* hemispherical fisheye */ |
128 |
+ |
x *= v->horiz/90.0; |
129 |
+ |
y *= v->vert/90.0; |
130 |
+ |
z = 1.0 - x*x - y*y; |
131 |
+ |
if (z < 0.0) |
132 |
+ |
return(-1); |
133 |
+ |
z = sqrt(z); |
134 |
+ |
VCOPY(orig, v->vp); |
135 |
+ |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
136 |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
137 |
+ |
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 */ |
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+ |
x *= v->horiz/180.0; |
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+ |
y *= v->vert/180.0; |
142 |
+ |
d = x*x + y*y; |
143 |
+ |
if (d > 1.0) |
144 |
+ |
return(-1); |
145 |
+ |
VCOPY(orig, v->vp); |
146 |
+ |
if (d <= FTINY) { |
147 |
+ |
VCOPY(direc, v->vdir); |
148 |
+ |
return(0); |
149 |
+ |
} |
150 |
+ |
d = sqrt(d); |
151 |
+ |
z = cos(PI*d); |
152 |
+ |
d = sqrt(1 - z*z)/d; |
153 |
+ |
x *= d; |
154 |
+ |
y *= d; |
155 |
+ |
direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
156 |
+ |
direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
157 |
+ |
direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
158 |
+ |
return(0); |
159 |
|
} |
160 |
+ |
return(-1); |
161 |
|
} |
162 |
|
|
163 |
|
|
164 |
< |
pixelview(xp, yp, zp, v, p) /* find image location for point */ |
164 |
> |
viewpixel(xp, yp, zp, v, p) /* find image location for point */ |
165 |
|
double *xp, *yp, *zp; |
166 |
|
register VIEW *v; |
167 |
|
FVECT p; |
168 |
|
{ |
117 |
– |
extern double sqrt(); |
169 |
|
double d; |
170 |
|
FVECT disp; |
171 |
< |
|
171 |
> |
|
172 |
|
disp[0] = p[0] - v->vp[0]; |
173 |
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disp[1] = p[1] - v->vp[1]; |
174 |
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disp[2] = p[2] - v->vp[2]; |
175 |
|
|
176 |
< |
if (v->type == VT_PAR) { /* parallel view */ |
176 |
> |
switch (v->type) { |
177 |
> |
case VT_PAR: /* parallel view */ |
178 |
|
if (zp != NULL) |
179 |
|
*zp = DOT(disp,v->vdir); |
180 |
< |
} else { /* perspective view */ |
181 |
< |
d = 1.0/DOT(disp,v->vdir); |
180 |
> |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
181 |
> |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
182 |
> |
return; |
183 |
> |
case VT_PER: /* perspective view */ |
184 |
> |
d = DOT(disp,v->vdir); |
185 |
|
if (zp != NULL) { |
186 |
|
*zp = sqrt(DOT(disp,disp)); |
187 |
|
if (d < 0.0) |
188 |
|
*zp = -*zp; |
189 |
|
} |
190 |
< |
disp[0] *= d; |
191 |
< |
disp[1] *= d; |
192 |
< |
disp[2] *= d; |
190 |
> |
if (d < 0.0) /* fold pyramid */ |
191 |
> |
d = -d; |
192 |
> |
if (d > FTINY) { |
193 |
> |
d = 1.0/d; |
194 |
> |
disp[0] *= d; |
195 |
> |
disp[1] *= d; |
196 |
> |
disp[2] *= d; |
197 |
> |
} |
198 |
> |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
199 |
> |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
200 |
> |
return; |
201 |
> |
case VT_HEM: /* hemispherical fisheye */ |
202 |
> |
d = normalize(disp); |
203 |
> |
if (zp != NULL) { |
204 |
> |
if (DOT(disp,v->vdir) < 0.0) |
205 |
> |
*zp = -d; |
206 |
> |
else |
207 |
> |
*zp = d; |
208 |
> |
} |
209 |
> |
*xp = DOT(disp,v->hvec)*90.0/v->horiz + 0.5 - v->hoff; |
210 |
> |
*yp = DOT(disp,v->vvec)*90.0/v->vert + 0.5 - v->voff; |
211 |
> |
return; |
212 |
> |
case VT_ANG: /* angular fisheye */ |
213 |
> |
d = normalize(disp); |
214 |
> |
if (zp != NULL) |
215 |
> |
*zp = d; |
216 |
> |
*xp = 0.5 - v->hoff; |
217 |
> |
*yp = 0.5 - v->voff; |
218 |
> |
d = DOT(disp,v->vdir); |
219 |
> |
if (d >= 1.0-FTINY) |
220 |
> |
return; |
221 |
> |
if (d <= -(1.0-FTINY)) { |
222 |
> |
*xp += 180.0/v->horiz; |
223 |
> |
*yp += 180.0/v->vert; |
224 |
> |
return; |
225 |
> |
} |
226 |
> |
d = acos(d)/PI / sqrt(1.0 - d*d); |
227 |
> |
*xp += DOT(disp,v->hvec)*d*180.0/v->horiz; |
228 |
> |
*yp += DOT(disp,v->vvec)*d*180.0/v->vert; |
229 |
> |
return; |
230 |
|
} |
139 |
– |
*xp = DOT(disp,v->vhinc)*v->vhs2 + 0.5*v->hresolu; |
140 |
– |
*yp = DOT(disp,v->vvinc)*v->vvs2 + 0.5*v->vresolu; |
231 |
|
} |
232 |
|
|
233 |
|
|
234 |
< |
sscanview(vp, s) /* get view parameters */ |
235 |
< |
register VIEW *vp; |
234 |
> |
int |
235 |
> |
getviewopt(v, ac, av) /* process view argument */ |
236 |
> |
register VIEW *v; |
237 |
> |
int ac; |
238 |
> |
register char *av[]; |
239 |
> |
{ |
240 |
> |
#define check(c,n) if ((av[0][c]&&av[0][c]!=' ') || n>=ac) return(-1) |
241 |
> |
extern double atof(); |
242 |
> |
|
243 |
> |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
244 |
> |
return(-1); |
245 |
> |
switch (av[0][2]) { |
246 |
> |
case 't': /* type */ |
247 |
> |
if (!av[0][3] || av[0][3]==' ') |
248 |
> |
return(-1); |
249 |
> |
check(4,0); |
250 |
> |
v->type = av[0][3]; |
251 |
> |
return(0); |
252 |
> |
case 'p': /* point */ |
253 |
> |
check(3,3); |
254 |
> |
v->vp[0] = atof(av[1]); |
255 |
> |
v->vp[1] = atof(av[2]); |
256 |
> |
v->vp[2] = atof(av[3]); |
257 |
> |
return(3); |
258 |
> |
case 'd': /* direction */ |
259 |
> |
check(3,3); |
260 |
> |
v->vdir[0] = atof(av[1]); |
261 |
> |
v->vdir[1] = atof(av[2]); |
262 |
> |
v->vdir[2] = atof(av[3]); |
263 |
> |
return(3); |
264 |
> |
case 'u': /* up */ |
265 |
> |
check(3,3); |
266 |
> |
v->vup[0] = atof(av[1]); |
267 |
> |
v->vup[1] = atof(av[2]); |
268 |
> |
v->vup[2] = atof(av[3]); |
269 |
> |
return(3); |
270 |
> |
case 'h': /* horizontal size */ |
271 |
> |
check(3,1); |
272 |
> |
v->horiz = atof(av[1]); |
273 |
> |
return(1); |
274 |
> |
case 'v': /* vertical size */ |
275 |
> |
check(3,1); |
276 |
> |
v->vert = atof(av[1]); |
277 |
> |
return(1); |
278 |
> |
case 's': /* shift */ |
279 |
> |
check(3,1); |
280 |
> |
v->hoff = atof(av[1]); |
281 |
> |
return(1); |
282 |
> |
case 'l': /* lift */ |
283 |
> |
check(3,1); |
284 |
> |
v->voff = atof(av[1]); |
285 |
> |
return(1); |
286 |
> |
default: |
287 |
> |
return(-1); |
288 |
> |
} |
289 |
> |
#undef check |
290 |
> |
} |
291 |
> |
|
292 |
> |
|
293 |
> |
int |
294 |
> |
sscanview(vp, s) /* get view parameters from string */ |
295 |
> |
VIEW *vp; |
296 |
|
register char *s; |
297 |
|
{ |
298 |
< |
for ( ; ; ) |
299 |
< |
switch (*s++) { |
300 |
< |
case '\0': |
301 |
< |
case '\n': |
302 |
< |
return(0); |
303 |
< |
case '-': |
304 |
< |
switch (*s++) { |
305 |
< |
case '\0': |
306 |
< |
return(-1); |
307 |
< |
case 'x': |
308 |
< |
if (sscanf(s, "%d", &vp->hresolu) != 1) |
309 |
< |
return(-1); |
310 |
< |
s = sskip(s); |
311 |
< |
continue; |
312 |
< |
case 'y': |
313 |
< |
if (sscanf(s, "%d", &vp->vresolu) != 1) |
314 |
< |
return(-1); |
315 |
< |
s = sskip(s); |
316 |
< |
continue; |
317 |
< |
case 'v': |
318 |
< |
switch (*s++) { |
319 |
< |
case '\0': |
320 |
< |
return(-1); |
321 |
< |
case 't': |
172 |
< |
vp->type = *s++; |
173 |
< |
continue; |
174 |
< |
case 'p': |
175 |
< |
if (sscanf(s, "%lf %lf %lf", |
176 |
< |
&vp->vp[0], |
177 |
< |
&vp->vp[1], |
178 |
< |
&vp->vp[2]) != 3) |
179 |
< |
return(-1); |
180 |
< |
s = sskip(sskip(sskip(s))); |
181 |
< |
continue; |
182 |
< |
case 'd': |
183 |
< |
if (sscanf(s, "%lf %lf %lf", |
184 |
< |
&vp->vdir[0], |
185 |
< |
&vp->vdir[1], |
186 |
< |
&vp->vdir[2]) != 3) |
187 |
< |
return(-1); |
188 |
< |
s = sskip(sskip(sskip(s))); |
189 |
< |
continue; |
190 |
< |
case 'u': |
191 |
< |
if (sscanf(s, "%lf %lf %lf", |
192 |
< |
&vp->vup[0], |
193 |
< |
&vp->vup[1], |
194 |
< |
&vp->vup[2]) != 3) |
195 |
< |
return(-1); |
196 |
< |
s = sskip(sskip(sskip(s))); |
197 |
< |
continue; |
198 |
< |
case 'h': |
199 |
< |
if (sscanf(s, "%lf", |
200 |
< |
&vp->horiz) != 1) |
201 |
< |
return(-1); |
202 |
< |
s = sskip(s); |
203 |
< |
continue; |
204 |
< |
case 'v': |
205 |
< |
if (sscanf(s, "%lf", |
206 |
< |
&vp->vert) != 1) |
207 |
< |
return(-1); |
208 |
< |
s = sskip(s); |
209 |
< |
continue; |
210 |
< |
} |
211 |
< |
continue; |
212 |
< |
} |
213 |
< |
continue; |
214 |
< |
} |
298 |
> |
int ac; |
299 |
> |
char *av[4]; |
300 |
> |
int na; |
301 |
> |
int nvopts = 0; |
302 |
> |
|
303 |
> |
while (*s == ' ') |
304 |
> |
s++; |
305 |
> |
while (*s) { |
306 |
> |
ac = 0; |
307 |
> |
do { |
308 |
> |
av[ac++] = s; |
309 |
> |
while (*s && *s != ' ') |
310 |
> |
s++; |
311 |
> |
while (*s == ' ') |
312 |
> |
s++; |
313 |
> |
} while (*s && ac < 4); |
314 |
> |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
315 |
> |
if (na+1 < ac) |
316 |
> |
s = av[na+1]; |
317 |
> |
nvopts++; |
318 |
> |
} else if (ac > 1) |
319 |
> |
s = av[1]; |
320 |
> |
} |
321 |
> |
return(nvopts); |
322 |
|
} |
323 |
|
|
324 |
|
|
331 |
|
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
332 |
|
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
333 |
|
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
334 |
< |
fprintf(fp, " -x %d -y %d", vp->hresolu, vp->vresolu); |
334 |
> |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
335 |
|
} |
336 |
|
|
337 |
|
|
348 |
|
|
349 |
|
for (an = altname; *an != NULL; an++) |
350 |
|
if (!strncmp(*an, s, strlen(*an))) { |
351 |
< |
if (sscanview(hview, s+strlen(*an)) == 0) |
351 |
> |
if (sscanview(hview, s+strlen(*an)) > 0) |
352 |
|
gothview++; |
353 |
|
return; |
354 |
|
} |
356 |
|
|
357 |
|
|
358 |
|
int |
359 |
< |
viewfile(fname, vp) /* get view from file */ |
359 |
> |
viewfile(fname, vp, xp, yp) /* get view from file */ |
360 |
|
char *fname; |
361 |
|
VIEW *vp; |
362 |
+ |
int *xp, *yp; |
363 |
|
{ |
364 |
|
extern char *progname; |
365 |
|
FILE *fp; |
372 |
|
gothview = 0; |
373 |
|
|
374 |
|
getheader(fp, gethview); |
375 |
+ |
|
376 |
+ |
if (xp != NULL && yp != NULL |
377 |
+ |
&& fgetresolu(xp, yp, fp) == -1) |
378 |
+ |
gothview = 0; |
379 |
|
|
380 |
|
fclose(fp); |
381 |
|
|