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/* Copyright (c) 1994 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 (v->vfore < -FTINY || v->vaft < -FTINY || |
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(v->vaft > FTINY && v->vaft <= v->vfore)) |
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return("illegal fore/aft clipping plane"); |
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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_CYL: /* cylindrical panorama */ |
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if (v->horiz > 360.0+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 = v->horiz * (PI/180.0); |
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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 * (PI/180.0); |
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v->vn2 = v->vert * (PI/180.0); |
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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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if (v->type != VT_CYL) { |
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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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} |
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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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double |
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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] + v->vfore*v->vdir[0] |
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+ x*v->hvec[0] + y*v->vvec[0]; |
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orig[1] = v->vp[1] + v->vfore*v->vdir[1] |
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+ x*v->hvec[1] + y*v->vvec[1]; |
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orig[2] = v->vp[2] + v->vfore*v->vdir[2] |
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+ x*v->hvec[2] + y*v->vvec[2]; |
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VCOPY(direc, v->vdir); |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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case VT_PER: /* perspective view */ |
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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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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
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return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
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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(-1.0); |
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z = sqrt(z); |
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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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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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case VT_CYL: /* cylindrical panorama */ |
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d = x * v->horiz * (PI/180.0); |
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z = cos(d); |
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x = sin(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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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
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return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
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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(-1.0); |
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d = sqrt(d); |
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z = cos(PI*d); |
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d = d <= FTINY ? PI : 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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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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} |
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return(-1.0); |
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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) - v->vfore; |
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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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} |
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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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ip[2] *= (1.0 - v->vfore*d); |
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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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ip[2] -= v->vfore; |
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break; |
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case VT_CYL: /* cylindrical panorama */ |
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ip[2] = DOT(disp,v->vdir); |
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d = DOT(disp,v->hvec); |
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ip[0] = 180.0/PI * atan2(d,ip[2]) / v->horiz + 0.5 - v->hoff; |
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ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
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if (v->vfore > FTINY) |
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ip[2] = sqrt(DOT(disp,disp)) * |
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(1.0 - v->vfore/sqrt(d*d + ip[2]*ip[2])); |
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else |
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ip[2] = sqrt(DOT(disp,disp)); |
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return; |
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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) - v->vfore; |
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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[0] += 180.0/v->horiz; |
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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; |
| 306 |
if (rp->or & YDECR) |
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y = rp->yr-1 - y; |
| 308 |
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[]; |
| 323 |
{ |
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#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
| 325 |
badarg(ac-1,av+1,l)) return(-1) |
| 326 |
|
| 327 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
| 328 |
return(-1); |
| 329 |
switch (av[0][2]) { |
| 330 |
case 't': /* type */ |
| 331 |
if (!av[0][3] || av[0][3]==' ') |
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return(-1); |
| 333 |
check(4,""); |
| 334 |
v->type = av[0][3]; |
| 335 |
return(0); |
| 336 |
case 'p': /* point */ |
| 337 |
check(3,"fff"); |
| 338 |
v->vp[0] = atof(av[1]); |
| 339 |
v->vp[1] = atof(av[2]); |
| 340 |
v->vp[2] = atof(av[3]); |
| 341 |
return(3); |
| 342 |
case 'd': /* direction */ |
| 343 |
check(3,"fff"); |
| 344 |
v->vdir[0] = atof(av[1]); |
| 345 |
v->vdir[1] = atof(av[2]); |
| 346 |
v->vdir[2] = atof(av[3]); |
| 347 |
return(3); |
| 348 |
case 'u': /* up */ |
| 349 |
check(3,"fff"); |
| 350 |
v->vup[0] = atof(av[1]); |
| 351 |
v->vup[1] = atof(av[2]); |
| 352 |
v->vup[2] = atof(av[3]); |
| 353 |
return(3); |
| 354 |
case 'h': /* horizontal size */ |
| 355 |
check(3,"f"); |
| 356 |
v->horiz = atof(av[1]); |
| 357 |
return(1); |
| 358 |
case 'v': /* vertical size */ |
| 359 |
check(3,"f"); |
| 360 |
v->vert = atof(av[1]); |
| 361 |
return(1); |
| 362 |
case 'o': /* fore clipping plane */ |
| 363 |
check(3,"f"); |
| 364 |
v->vfore = atof(av[1]); |
| 365 |
return(1); |
| 366 |
case 'a': /* aft clipping plane */ |
| 367 |
check(3,"f"); |
| 368 |
v->vaft = atof(av[1]); |
| 369 |
return(1); |
| 370 |
case 's': /* shift */ |
| 371 |
check(3,"f"); |
| 372 |
v->hoff = atof(av[1]); |
| 373 |
return(1); |
| 374 |
case 'l': /* lift */ |
| 375 |
check(3,"f"); |
| 376 |
v->voff = atof(av[1]); |
| 377 |
return(1); |
| 378 |
default: |
| 379 |
return(-1); |
| 380 |
} |
| 381 |
#undef check |
| 382 |
} |
| 383 |
|
| 384 |
|
| 385 |
int |
| 386 |
sscanview(vp, s) /* get view parameters from string */ |
| 387 |
VIEW *vp; |
| 388 |
register char *s; |
| 389 |
{ |
| 390 |
int ac; |
| 391 |
char *av[4]; |
| 392 |
int na; |
| 393 |
int nvopts = 0; |
| 394 |
|
| 395 |
if (*s != '-') |
| 396 |
s = sskip(s); |
| 397 |
while (*s) { |
| 398 |
ac = 0; |
| 399 |
do { |
| 400 |
av[ac++] = s; |
| 401 |
while (*s && *s != ' ') |
| 402 |
s++; |
| 403 |
while (*s == ' ') |
| 404 |
s++; |
| 405 |
} while (*s && ac < 4); |
| 406 |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
| 407 |
if (na+1 < ac) |
| 408 |
s = av[na+1]; |
| 409 |
nvopts++; |
| 410 |
} else if (ac > 1) |
| 411 |
s = av[1]; |
| 412 |
} |
| 413 |
return(nvopts); |
| 414 |
} |
| 415 |
|
| 416 |
|
| 417 |
fprintview(vp, fp) /* write out view parameters */ |
| 418 |
register VIEW *vp; |
| 419 |
FILE *fp; |
| 420 |
{ |
| 421 |
fprintf(fp, " -vt%c", vp->type); |
| 422 |
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
| 423 |
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
| 424 |
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
| 425 |
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
| 426 |
fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
| 427 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
| 428 |
} |
| 429 |
|
| 430 |
|
| 431 |
int |
| 432 |
isview(s) /* is this a view string? */ |
| 433 |
char *s; |
| 434 |
{ |
| 435 |
static char *altname[]={NULL,VIEWSTR,"rpict","rview","pinterp",NULL}; |
| 436 |
extern char *progname; |
| 437 |
register char *cp; |
| 438 |
register char **an; |
| 439 |
/* add program name to list */ |
| 440 |
if (altname[0] == NULL) { |
| 441 |
for (cp = progname; *cp; cp++) |
| 442 |
; |
| 443 |
while (cp > progname && !ISDIRSEP(cp[-1])) |
| 444 |
cp--; |
| 445 |
altname[0] = cp; |
| 446 |
} |
| 447 |
/* skip leading path */ |
| 448 |
cp = s; |
| 449 |
while (*cp && *cp != ' ') |
| 450 |
cp++; |
| 451 |
while (cp > s && !ISDIRSEP(cp[-1])) |
| 452 |
cp--; |
| 453 |
for (an = altname; *an != NULL; an++) |
| 454 |
if (!strncmp(*an, cp, strlen(*an))) |
| 455 |
return(1); |
| 456 |
return(0); |
| 457 |
} |
| 458 |
|
| 459 |
|
| 460 |
struct myview { |
| 461 |
VIEW *hv; |
| 462 |
int ok; |
| 463 |
}; |
| 464 |
|
| 465 |
|
| 466 |
static |
| 467 |
gethview(s, v) /* get view from header */ |
| 468 |
char *s; |
| 469 |
register struct myview *v; |
| 470 |
{ |
| 471 |
if (isview(s) && sscanview(v->hv, s) > 0) |
| 472 |
v->ok++; |
| 473 |
} |
| 474 |
|
| 475 |
|
| 476 |
int |
| 477 |
viewfile(fname, vp, rp) /* get view from file */ |
| 478 |
char *fname; |
| 479 |
VIEW *vp; |
| 480 |
RESOLU *rp; |
| 481 |
{ |
| 482 |
struct myview mvs; |
| 483 |
FILE *fp; |
| 484 |
|
| 485 |
if ((fp = fopen(fname, "r")) == NULL) |
| 486 |
return(-1); |
| 487 |
|
| 488 |
mvs.hv = vp; |
| 489 |
mvs.ok = 0; |
| 490 |
|
| 491 |
getheader(fp, gethview, &mvs); |
| 492 |
|
| 493 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
| 494 |
mvs.ok = 0; |
| 495 |
|
| 496 |
fclose(fp); |
| 497 |
|
| 498 |
return(mvs.ok); |
| 499 |
} |
