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#include "view.h" |
16 |
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17 |
< |
VIEW stdview = STDVIEW(512); /* default view parameters */ |
17 |
> |
VIEW stdview = STDVIEW; /* default view parameters */ |
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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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|
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> |
extern double tan(), normalize(); |
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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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fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
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|
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if (v->type == VT_PAR) |
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dt = v->horiz; |
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> |
v->hn2 = v->horiz; |
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else if (v->type == VT_PER) |
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dt = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
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v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
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else |
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return("unknown view type"); |
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if (dt <= FTINY || dt >= FHUGE) |
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if (v->hn2 <= FTINY || v->hn2 >= FHUGE) |
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return("illegal horizontal view size"); |
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|
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if (v->hresolu <= 0) |
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return("illegal horizontal resolution"); |
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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->hn2 *= v->hn2; |
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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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|
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if (v->type == VT_PAR) |
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dt = v->vert; |
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v->vn2 = 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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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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|
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if (dt <= FTINY || dt >= FHUGE) |
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if (v->vn2 <= FTINY || v->vn2 >= FHUGE) |
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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; |
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v->vvinc[0] *= dt; |
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v->vvinc[1] *= dt; |
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v->vvinc[2] *= dt; |
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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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v->vn2 *= v->vn2; |
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|
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return(NULL); |
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} |
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rayview(orig, direc, v, x, y) /* compute ray origin and direction */ |
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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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{ |
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if (*ap <= FTINY) |
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*ap = va * *xp / *yp; /* compute pixel aspect */ |
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else if (va * *xp > *ap * *yp) |
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*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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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; |
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{ |
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register int i; |
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x += v->hoff - 0.5; |
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y += v->voff - 0.5; |
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|
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x -= 0.5 * v->hresolu; |
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y -= 0.5 * v->vresolu; |
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|
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if (v->type == VT_PAR) { /* parallel view */ |
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for (i = 0; i < 3; i++) |
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orig[i] = v->vp[i] + x*v->vhinc[i] + y*v->vvinc[i]; |
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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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VCOPY(direc, v->vdir); |
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} else { /* perspective view */ |
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VCOPY(orig, v->vp); |
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for (i = 0; i < 3; i++) |
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direc[i] = v->vdir[i] + x*v->vhinc[i] + y*v->vvinc[i]; |
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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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normalize(direc); |
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} |
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} |
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sscanview(vp, s) /* get view parameters */ |
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register VIEW *vp; |
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register char *s; |
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> |
viewpixel(xp, yp, zp, v, p) /* find image location for point */ |
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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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for ( ; ; ) |
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switch (*s++) { |
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case '\0': |
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case '\n': |
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return(0); |
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case '-': |
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switch (*s++) { |
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< |
case '\0': |
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< |
return(-1); |
119 |
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case 'x': |
120 |
< |
if (sscanf(s, "%d", &vp->hresolu) != 1) |
121 |
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return(-1); |
122 |
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s = sskip(s); |
123 |
< |
continue; |
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< |
case 'y': |
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< |
if (sscanf(s, "%d", &vp->vresolu) != 1) |
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< |
return(-1); |
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s = sskip(s); |
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continue; |
120 |
< |
case 'v': |
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< |
switch (*s++) { |
122 |
< |
case '\0': |
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< |
return(-1); |
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< |
case 't': |
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< |
vp->type = *s++; |
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< |
continue; |
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< |
case 'p': |
128 |
< |
if (sscanf(s, "%lf %lf %lf", |
129 |
< |
&vp->vp[0], |
130 |
< |
&vp->vp[1], |
131 |
< |
&vp->vp[2]) != 3) |
132 |
< |
return(-1); |
133 |
< |
s = sskip(sskip(sskip(s))); |
134 |
< |
continue; |
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< |
case 'd': |
136 |
< |
if (sscanf(s, "%lf %lf %lf", |
137 |
< |
&vp->vdir[0], |
138 |
< |
&vp->vdir[1], |
139 |
< |
&vp->vdir[2]) != 3) |
140 |
< |
return(-1); |
141 |
< |
s = sskip(sskip(sskip(s))); |
142 |
< |
continue; |
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< |
case 'u': |
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< |
if (sscanf(s, "%lf %lf %lf", |
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< |
&vp->vup[0], |
146 |
< |
&vp->vup[1], |
147 |
< |
&vp->vup[2]) != 3) |
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< |
return(-1); |
149 |
< |
s = sskip(sskip(sskip(s))); |
150 |
< |
continue; |
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< |
case 'h': |
152 |
< |
if (sscanf(s, "%lf", |
153 |
< |
&vp->horiz) != 1) |
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< |
return(-1); |
155 |
< |
s = sskip(s); |
156 |
< |
continue; |
157 |
< |
case 'v': |
158 |
< |
if (sscanf(s, "%lf", |
159 |
< |
&vp->vert) != 1) |
160 |
< |
return(-1); |
161 |
< |
s = sskip(s); |
162 |
< |
continue; |
163 |
< |
} |
164 |
< |
continue; |
165 |
< |
} |
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< |
continue; |
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> |
extern double sqrt(); |
111 |
> |
double d; |
112 |
> |
FVECT disp; |
113 |
> |
|
114 |
> |
disp[0] = p[0] - v->vp[0]; |
115 |
> |
disp[1] = p[1] - v->vp[1]; |
116 |
> |
disp[2] = p[2] - v->vp[2]; |
117 |
> |
|
118 |
> |
if (v->type == VT_PAR) { /* parallel view */ |
119 |
> |
if (zp != NULL) |
120 |
> |
*zp = DOT(disp,v->vdir); |
121 |
> |
} else { /* perspective view */ |
122 |
> |
d = 1.0/DOT(disp,v->vdir); |
123 |
> |
if (zp != NULL) { |
124 |
> |
*zp = sqrt(DOT(disp,disp)); |
125 |
> |
if (d < 0.0) |
126 |
> |
*zp = -*zp; |
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} |
128 |
+ |
disp[0] *= d; |
129 |
+ |
disp[1] *= d; |
130 |
+ |
disp[2] *= d; |
131 |
+ |
} |
132 |
+ |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
133 |
+ |
*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
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} |
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136 |
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|
137 |
+ |
int |
138 |
+ |
getviewopt(v, ac, av) /* process view argument */ |
139 |
+ |
register VIEW *v; |
140 |
+ |
int ac; |
141 |
+ |
register char *av[]; |
142 |
+ |
{ |
143 |
+ |
#define check(c,n) if ((av[0][c]&&av[0][c]!=' ') || n>=ac) return(-1) |
144 |
+ |
extern double atof(); |
145 |
+ |
|
146 |
+ |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
147 |
+ |
return(-1); |
148 |
+ |
switch (av[0][2]) { |
149 |
+ |
case 't': /* type */ |
150 |
+ |
if (!av[0][3] || av[0][3]==' ') |
151 |
+ |
return(-1); |
152 |
+ |
check(4,0); |
153 |
+ |
v->type = av[0][3]; |
154 |
+ |
return(0); |
155 |
+ |
case 'p': /* point */ |
156 |
+ |
check(3,3); |
157 |
+ |
v->vp[0] = atof(av[1]); |
158 |
+ |
v->vp[1] = atof(av[2]); |
159 |
+ |
v->vp[2] = atof(av[3]); |
160 |
+ |
return(3); |
161 |
+ |
case 'd': /* direction */ |
162 |
+ |
check(3,3); |
163 |
+ |
v->vdir[0] = atof(av[1]); |
164 |
+ |
v->vdir[1] = atof(av[2]); |
165 |
+ |
v->vdir[2] = atof(av[3]); |
166 |
+ |
return(3); |
167 |
+ |
case 'u': /* up */ |
168 |
+ |
check(3,3); |
169 |
+ |
v->vup[0] = atof(av[1]); |
170 |
+ |
v->vup[1] = atof(av[2]); |
171 |
+ |
v->vup[2] = atof(av[3]); |
172 |
+ |
return(3); |
173 |
+ |
case 'h': /* horizontal size */ |
174 |
+ |
check(3,1); |
175 |
+ |
v->horiz = atof(av[1]); |
176 |
+ |
return(1); |
177 |
+ |
case 'v': /* vertical size */ |
178 |
+ |
check(3,1); |
179 |
+ |
v->vert = atof(av[1]); |
180 |
+ |
return(1); |
181 |
+ |
case 's': /* shift */ |
182 |
+ |
check(3,1); |
183 |
+ |
v->hoff = atof(av[1]); |
184 |
+ |
return(1); |
185 |
+ |
case 'l': /* lift */ |
186 |
+ |
check(3,1); |
187 |
+ |
v->voff = atof(av[1]); |
188 |
+ |
return(1); |
189 |
+ |
default: |
190 |
+ |
return(-1); |
191 |
+ |
} |
192 |
+ |
#undef check |
193 |
+ |
} |
194 |
+ |
|
195 |
+ |
|
196 |
+ |
int |
197 |
+ |
sscanview(vp, s) /* get view parameters from string */ |
198 |
+ |
VIEW *vp; |
199 |
+ |
register char *s; |
200 |
+ |
{ |
201 |
+ |
int ac; |
202 |
+ |
char *av[4]; |
203 |
+ |
int na; |
204 |
+ |
int nvopts = 0; |
205 |
+ |
|
206 |
+ |
while (*s == ' ') |
207 |
+ |
s++; |
208 |
+ |
while (*s) { |
209 |
+ |
ac = 0; |
210 |
+ |
do { |
211 |
+ |
av[ac++] = s; |
212 |
+ |
while (*s && *s != ' ') |
213 |
+ |
s++; |
214 |
+ |
while (*s == ' ') |
215 |
+ |
s++; |
216 |
+ |
} while (*s && ac < 4); |
217 |
+ |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
218 |
+ |
if (na+1 < ac) |
219 |
+ |
s = av[na+1]; |
220 |
+ |
nvopts++; |
221 |
+ |
} else if (ac > 1) |
222 |
+ |
s = av[1]; |
223 |
+ |
} |
224 |
+ |
return(nvopts); |
225 |
+ |
} |
226 |
+ |
|
227 |
+ |
|
228 |
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fprintview(vp, fp) /* write out view parameters */ |
229 |
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register VIEW *vp; |
230 |
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FILE *fp; |
234 |
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fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
235 |
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fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
236 |
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fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
237 |
< |
fprintf(fp, " -x %d -y %d", vp->hresolu, vp->vresolu); |
237 |
> |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
238 |
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} |
239 |
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|
240 |
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|
241 |
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static VIEW *hview; /* view from header */ |
242 |
|
static int gothview; /* success indicator */ |
243 |
< |
static char *altname[] = {NULL,"rpict","rview",VIEWSTR,NULL}; |
243 |
> |
static char *altname[] = {NULL,"rpict","rview","pinterp",VIEWSTR,NULL}; |
244 |
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|
245 |
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|
246 |
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static |
251 |
|
|
252 |
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for (an = altname; *an != NULL; an++) |
253 |
|
if (!strncmp(*an, s, strlen(*an))) { |
254 |
< |
if (sscanview(hview, s+strlen(*an)) == 0) |
254 |
> |
if (sscanview(hview, s+strlen(*an)) > 0) |
255 |
|
gothview++; |
256 |
|
return; |
257 |
|
} |
259 |
|
|
260 |
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|
261 |
|
int |
262 |
< |
viewfile(fname, vp) /* get view from file */ |
262 |
> |
viewfile(fname, vp, xp, yp) /* get view from file */ |
263 |
|
char *fname; |
264 |
|
VIEW *vp; |
265 |
+ |
int *xp, *yp; |
266 |
|
{ |
267 |
|
extern char *progname; |
268 |
|
FILE *fp; |
275 |
|
gothview = 0; |
276 |
|
|
277 |
|
getheader(fp, gethview); |
278 |
+ |
|
279 |
+ |
if (xp != NULL && yp != NULL |
280 |
+ |
&& fgetresolu(xp, yp, fp) == -1) |
281 |
+ |
gothview = 0; |
282 |
|
|
283 |
|
fclose(fp); |
284 |
|
|