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greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* image.c - routines for image generation.
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*
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* 10/17/85
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*/
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#include "standard.h"
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#include "view.h"
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greg |
1.5 |
VIEW stdview = STDVIEW; /* default view parameters */
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greg |
1.1 |
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char *
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greg |
1.5 |
setview(v) /* set hvec and vvec, return message on error */
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register VIEW *v;
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greg |
1.3 |
{
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greg |
1.5 |
extern double tan(), normalize();
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greg |
1.3 |
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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 |
1.5 |
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 |
1.1 |
return("illegal view up vector");
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greg |
1.5 |
fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */
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greg |
1.1 |
if (v->type == VT_PAR)
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greg |
1.5 |
v->hn2 = v->horiz;
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greg |
1.1 |
else if (v->type == VT_PER)
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greg |
1.5 |
v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
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greg |
1.1 |
else
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return("unknown view type");
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greg |
1.5 |
if (v->hn2 <= FTINY || v->hn2 >= FHUGE)
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greg |
1.1 |
return("illegal horizontal view size");
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greg |
1.5 |
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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greg |
1.1 |
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if (v->type == VT_PAR)
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greg |
1.5 |
v->vn2 = v->vert;
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greg |
1.1 |
else
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greg |
1.5 |
v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
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greg |
1.1 |
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greg |
1.5 |
if (v->vn2 <= FTINY || v->vn2 >= FHUGE)
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greg |
1.1 |
return("illegal vertical view size");
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greg |
1.5 |
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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greg |
1.1 |
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return(NULL);
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}
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greg |
1.6 |
normaspect(vp, ap, xp, yp) /* fix pixel aspect or resolution */
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VIEW *vp;
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double *ap;
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int *xp, *yp;
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{
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double va = viewaspect(vp);
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if (*ap <= FTINY)
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*ap = (double)*yp / *xp / va; /* compute pixel aspect */
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else if (va * *xp > *ap * *yp)
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*xp = *yp / va * *ap; /* reduce x resolution */
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else
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*yp = *xp * va / *ap; /* reduce y resolution */
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}
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greg |
1.5 |
viewray(orig, direc, v, x, y) /* compute ray origin and direction */
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greg |
1.1 |
FVECT orig, direc;
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register VIEW *v;
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double x, y;
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{
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greg |
1.5 |
x += v->hoff - 0.5;
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y += v->voff - 0.5;
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greg |
1.1 |
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if (v->type == VT_PAR) { /* parallel view */
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greg |
1.5 |
orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0];
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orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1];
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orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2];
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greg |
1.1 |
VCOPY(direc, v->vdir);
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} else { /* perspective view */
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VCOPY(orig, v->vp);
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greg |
1.5 |
direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
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direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
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direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
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greg |
1.1 |
normalize(direc);
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}
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}
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greg |
1.5 |
viewpixel(xp, yp, zp, v, p) /* find image location for point */
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greg |
1.3 |
double *xp, *yp, *zp;
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register VIEW *v;
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FVECT p;
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{
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extern double sqrt();
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double d;
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FVECT disp;
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greg |
1.5 |
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greg |
1.3 |
disp[0] = p[0] - v->vp[0];
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disp[1] = p[1] - v->vp[1];
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disp[2] = p[2] - v->vp[2];
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if (v->type == VT_PAR) { /* parallel view */
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if (zp != NULL)
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*zp = DOT(disp,v->vdir);
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} else { /* perspective view */
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d = 1.0/DOT(disp,v->vdir);
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if (zp != NULL) {
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*zp = sqrt(DOT(disp,disp));
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if (d < 0.0)
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*zp = -*zp;
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}
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disp[0] *= d;
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disp[1] *= d;
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disp[2] *= d;
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}
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greg |
1.5 |
*xp = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
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*yp = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
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greg |
1.3 |
}
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greg |
1.5 |
int
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getviewopt(v, ac, av) /* process view argument */
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register VIEW *v;
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int ac;
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register char *av[];
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{
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#define check(c,n) if ((av[0][c]&&av[0][c]!=' ') || n>=ac) return(-1)
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extern double atof();
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if (av[0][0] != '-' || av[0][1] != 'v')
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return(-1);
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switch (av[0][2]) {
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case 't': /* type */
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if (!av[0][3] || av[0][3]==' ')
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return(-1);
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check(4,0);
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v->type = av[0][3];
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return(0);
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case 'p': /* point */
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check(3,3);
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v->vp[0] = atof(av[1]);
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v->vp[1] = atof(av[2]);
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v->vp[2] = atof(av[3]);
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return(3);
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case 'd': /* direction */
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check(3,3);
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v->vdir[0] = atof(av[1]);
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v->vdir[1] = atof(av[2]);
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v->vdir[2] = atof(av[3]);
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return(3);
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case 'u': /* up */
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check(3,3);
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v->vup[0] = atof(av[1]);
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v->vup[1] = atof(av[2]);
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v->vup[2] = atof(av[3]);
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return(3);
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case 'h': /* horizontal size */
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check(3,1);
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v->horiz = atof(av[1]);
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return(1);
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case 'v': /* vertical size */
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check(3,1);
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v->vert = atof(av[1]);
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return(1);
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case 's': /* shift */
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check(3,1);
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v->hoff = atof(av[1]);
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return(1);
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case 'l': /* lift */
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check(3,1);
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v->voff = atof(av[1]);
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return(1);
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default:
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return(-1);
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}
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#undef check
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}
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int
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sscanview(vp, s) /* get view parameters from string */
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VIEW *vp;
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greg |
1.1 |
register char *s;
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{
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greg |
1.5 |
int ac;
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char *av[4];
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int na;
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int nvopts = 0;
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while (*s == ' ')
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s++;
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do {
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ac = 0;
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do {
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av[ac++] = s;
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while (*s && *s != ' ')
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s++;
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while (*s == ' ')
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s++;
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} while (*s && ac < 4);
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if ((na = getviewopt(vp, ac, av)) >= 0) {
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if (na+1 < ac)
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s = av[na+1];
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nvopts++;
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greg |
1.1 |
}
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greg |
1.5 |
} while (*s);
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return(nvopts);
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greg |
1.1 |
}
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fprintview(vp, fp) /* write out view parameters */
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register VIEW *vp;
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FILE *fp;
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{
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fprintf(fp, " -vt%c", vp->type);
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fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
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fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]);
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fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
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fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
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greg |
1.5 |
fprintf(fp, " -vs %d -vl %d", vp->hoff, vp->voff);
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greg |
1.1 |
}
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static VIEW *hview; /* view from header */
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static int gothview; /* success indicator */
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greg |
1.3 |
static char *altname[] = {NULL,"rpict","rview","pinterp",VIEWSTR,NULL};
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greg |
1.1 |
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static
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gethview(s) /* get view from header */
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char *s;
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{
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register char **an;
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for (an = altname; *an != NULL; an++)
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if (!strncmp(*an, s, strlen(*an))) {
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greg |
1.5 |
if (sscanview(hview, s+strlen(*an)) > 0)
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greg |
1.1 |
gothview++;
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return;
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}
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}
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int
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viewfile(fname, vp) /* get view from file */
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char *fname;
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VIEW *vp;
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{
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extern char *progname;
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FILE *fp;
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if ((fp = fopen(fname, "r")) == NULL)
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return(-1);
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altname[0] = progname;
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hview = vp;
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gothview = 0;
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getheader(fp, gethview);
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fclose(fp);
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return(gothview);
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}
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