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/* Copyright (c) 1992 Regents of the University of California */ |
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|
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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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/* |
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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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|
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#include "standard.h" |
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|
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#include "view.h" |
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|
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#include "resolu.h" |
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|
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#include "paths.h" |
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|
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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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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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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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if (normalize(v->vup) == 0.0) /* normalize view up */ |
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return("zero view up vector"); |
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|
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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("view up parallel to view direction"); |
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|
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fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
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|
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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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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_ANG) { |
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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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return(NULL); |
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} |
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|
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|
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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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double d, z; |
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|
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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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switch(v->type) { |
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case VT_PAR: /* parallel view */ |
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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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return(0); |
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case VT_PER: /* perspective view */ |
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VCOPY(orig, v->vp); |
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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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return(0); |
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case VT_HEM: /* hemispherical fisheye */ |
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z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
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if (z < 0.0) |
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return(-1); |
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z = sqrt(z); |
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VCOPY(orig, v->vp); |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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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]; |
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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; |
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d = x*x + y*y; |
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if (d > 1.0) |
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return(-1); |
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VCOPY(orig, v->vp); |
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if (d <= FTINY) { |
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VCOPY(direc, v->vdir); |
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return(0); |
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} |
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d = sqrt(d); |
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z = cos(PI*d); |
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d = sqrt(1 - z*z)/d; |
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x *= d; |
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y *= d; |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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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]; |
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return(0); |
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} |
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return(-1); |
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} |
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|
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|
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viewloc(ip, v, p) /* find image location for point */ |
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FVECT ip; |
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register VIEW *v; |
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FVECT p; |
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{ |
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double d; |
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FVECT disp; |
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|
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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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|
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switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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ip[2] = DOT(disp,v->vdir); |
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break; |
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case VT_PER: /* perspective view */ |
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d = DOT(disp,v->vdir); |
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ip[2] = sqrt(DOT(disp,disp)); |
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if (d < 0.0) { /* fold pyramid */ |
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ip[2] = -ip[2]; |
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d = -d; |
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} else if (d > FTINY) { |
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d = 1.0/d; |
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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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break; |
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case VT_HEM: /* hemispherical fisheye */ |
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d = normalize(disp); |
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if (DOT(disp,v->vdir) < 0.0) |
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ip[2] = -d; |
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else |
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ip[2] = d; |
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break; |
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case VT_ANG: /* angular fisheye */ |
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ip[0] = 0.5 - v->hoff; |
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ip[1] = 0.5 - v->voff; |
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ip[2] = normalize(disp); |
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d = DOT(disp,v->vdir); |
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if (d >= 1.0-FTINY) |
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return; |
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if (d <= -(1.0-FTINY)) { |
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ip[1] += 180.0/v->horiz; |
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ip[2] += 180.0/v->vert; |
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return; |
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} |
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d = acos(d)/PI / sqrt(1.0 - d*d); |
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ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz; |
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ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert; |
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return; |
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} |
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ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
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ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
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} |
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|
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|
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pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */ |
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FLOAT loc[2]; |
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register RESOLU *rp; |
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int px, py; |
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{ |
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register int x, y; |
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|
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if (rp->or & YMAJOR) { |
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x = px; |
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y = py; |
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} else { |
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x = py; |
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y = px; |
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} |
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if (rp->or & XDECR) |
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x = rp->xr-1 - x; |
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if (rp->or & YDECR) |
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y = rp->yr-1 - y; |
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loc[0] = (x+.5)/rp->xr; |
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loc[1] = (y+.5)/rp->yr; |
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} |
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|
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|
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loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */ |
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int pp[2]; |
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register RESOLU *rp; |
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double lx, ly; |
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{ |
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register int x, y; |
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|
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x = lx * rp->xr; |
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y = ly * rp->yr; |
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if (rp->or & XDECR) |
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x = rp->xr-1 - x; |
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if (rp->or & YDECR) |
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y = rp->yr-1 - y; |
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if (rp->or & YMAJOR) { |
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pp[0] = x; |
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pp[1] = y; |
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} else { |
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pp[0] = y; |
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pp[1] = x; |
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} |
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} |
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|
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|
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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,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
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badarg(ac-1,av+1,l)) return(-1) |
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|
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if (ac <= 0 || 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,""); |
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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,"fff"); |
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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,"fff"); |
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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,"fff"); |
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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,"f"); |
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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,"f"); |
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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,"f"); |
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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,"f"); |
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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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|
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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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register char *s; |
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{ |
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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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|
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if (*s != '-') |
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s = sskip(s); |
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while (*s) { |
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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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} else if (ac > 1) |
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s = av[1]; |
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} |
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return(nvopts); |
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} |
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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, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
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} |
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|
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|
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int |
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isview(s) /* is this a view string? */ |
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char *s; |
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{ |
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static char *altname[]={NULL,"rpict","rview","pinterp",VIEWSTR,NULL}; |
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extern char *progname, *rindex(); |
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register char *cp; |
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register char **an; |
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/* add program name to list */ |
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if (altname[0] == NULL) |
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if ((cp = rindex(progname, DIRSEP)) != NULL) |
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altname[0] = cp+1; |
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else |
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altname[0] = progname; |
| 391 |
/* skip leading path */ |
| 392 |
cp = s; |
| 393 |
while (*cp && *cp != ' ') |
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cp++; |
| 395 |
while (cp > s && cp[-1] != DIRSEP) |
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cp--; |
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for (an = altname; *an != NULL; an++) |
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if (!strncmp(*an, cp, strlen(*an))) |
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return(1); |
| 400 |
return(0); |
| 401 |
} |
| 402 |
|
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|
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struct myview { |
| 405 |
VIEW *hv; |
| 406 |
int ok; |
| 407 |
}; |
| 408 |
|
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|
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static |
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gethview(s, v) /* get view from header */ |
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char *s; |
| 413 |
register struct myview *v; |
| 414 |
{ |
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if (isview(s) && sscanview(v->hv, s) > 0) |
| 416 |
v->ok++; |
| 417 |
} |
| 418 |
|
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|
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int |
| 421 |
viewfile(fname, vp, rp) /* get view from file */ |
| 422 |
char *fname; |
| 423 |
VIEW *vp; |
| 424 |
RESOLU *rp; |
| 425 |
{ |
| 426 |
struct myview mvs; |
| 427 |
FILE *fp; |
| 428 |
|
| 429 |
if ((fp = fopen(fname, "r")) == NULL) |
| 430 |
return(-1); |
| 431 |
|
| 432 |
mvs.hv = vp; |
| 433 |
mvs.ok = 0; |
| 434 |
|
| 435 |
getheader(fp, gethview, &mvs); |
| 436 |
|
| 437 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
| 438 |
mvs.ok = 0; |
| 439 |
|
| 440 |
fclose(fp); |
| 441 |
|
| 442 |
return(mvs.ok); |
| 443 |
} |
