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/* 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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VIEW stdview = STDVIEW(512); /* 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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register VIEW *v;
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{
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double tan(), dt;
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if (normalize(v->vdir) == 0.0) /* normalize direction */
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return("zero view direction");
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fcross(v->vhinc, v->vdir, v->vup); /* compute horiz dir */
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if (normalize(v->vhinc) == 0.0)
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return("illegal view up vector");
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fcross(v->vvinc, v->vhinc, v->vdir); /* compute vert dir */
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if (v->type == VT_PAR)
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dt = 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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else
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return("unknown view type");
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if (dt <= FTINY || dt >= FHUGE)
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return("illegal horizontal view size");
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if (v->hresolu <= 0)
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return("illegal horizontal resolution");
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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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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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if (dt <= FTINY || dt >= FHUGE)
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return("illegal vertical view size");
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if (v->vresolu <= 0)
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return("illegal vertical resolution");
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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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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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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 -= 0.5 * v->hresolu;
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y -= 0.5 * v->vresolu;
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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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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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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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{
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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);
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case 'x':
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if (sscanf(s, "%d", &vp->hresolu) != 1)
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return(-1);
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s = sskip(s);
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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;
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case 'v':
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switch (*s++) {
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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':
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if (sscanf(s, "%lf %lf %lf",
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&vp->vp[0],
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&vp->vp[1],
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&vp->vp[2]) != 3)
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return(-1);
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s = sskip(sskip(sskip(s)));
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continue;
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case 'd':
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if (sscanf(s, "%lf %lf %lf",
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&vp->vdir[0],
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&vp->vdir[1],
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&vp->vdir[2]) != 3)
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return(-1);
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s = sskip(sskip(sskip(s)));
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continue;
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case 'u':
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if (sscanf(s, "%lf %lf %lf",
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&vp->vup[0],
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&vp->vup[1],
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&vp->vup[2]) != 3)
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return(-1);
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s = sskip(sskip(sskip(s)));
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continue;
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case 'h':
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if (sscanf(s, "%lf",
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&vp->horiz) != 1)
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return(-1);
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s = sskip(s);
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continue;
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case 'v':
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if (sscanf(s, "%lf",
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&vp->vert) != 1)
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return(-1);
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s = sskip(s);
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continue;
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}
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continue;
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}
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continue;
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}
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}
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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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fprintf(fp, " -x %d -y %d", vp->hresolu, vp->vresolu);
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}
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static VIEW *hview; /* view from header */
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static int gothview; /* success indicator */
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static char *altname[] = {NULL,"rpict","rview",VIEWSTR,NULL};
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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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if (sscanview(hview, s+strlen(*an)) == 0)
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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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