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/* Copyright (c) 1996 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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static const char RCSid[] = "$Id$"; |
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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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* External symbols declared in view.h |
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*/ |
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#include "standard.h" |
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#include "copyright.h" |
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#include "rtio.h" |
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#include "paths.h" |
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#include "view.h" |
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#include "resolu.h" |
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#include "paths.h" |
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#define FEQ(x,y) (fabs((x)-(y)) <= FTINY) |
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#define VEQ(v,w) (FEQ((v)[0],(w)[0]) && FEQ((v)[1],(w)[1]) \ |
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&& FEQ((v)[2],(w)[2])) |
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VIEW stdview = STDVIEW; /* default view parameters */ |
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static gethfunc gethview; |
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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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static char ill_horiz[] = "illegal horizontal view size"; |
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static char ill_vert[] = "illegal vertical view size"; |
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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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if (v->vaft < -FTINY || (v->vaft > FTINY && v->vaft <= v->vfore)) |
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return("illegal fore/aft clipping plane"); |
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if (normalize(v->vdir) == 0.0) /* normalize direction */ |
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} |
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void |
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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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} |
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void |
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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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d = 1.0/sqrt(d*d + d2*d2); |
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ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff; |
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ip[2] = VLEN(disp); |
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if (v->vfore > FTINY) |
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ip[2] *= (1.0 - v->vfore*d); |
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ip[2] *= (1.0 - v->vfore*d); |
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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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} |
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void |
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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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RREAL 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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if (rp->or & YMAJOR) { |
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if (rp->rt & 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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if (rp->rt & XDECR) |
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x = rp->xr-1 - x; |
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if (rp->or & YDECR) |
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if (rp->rt & 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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void |
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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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x = lx * rp->xr; |
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y = ly * rp->yr; |
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if (rp->or & XDECR) |
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if (rp->rt & XDECR) |
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x = rp->xr-1 - x; |
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if (rp->or & YDECR) |
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if (rp->rt & YDECR) |
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y = rp->yr-1 - y; |
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if (rp->or & YMAJOR) { |
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if (rp->rt & YMAJOR) { |
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pp[0] = x; |
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pp[1] = y; |
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} else { |
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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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if (*s != '-') |
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s = sskip2(s,1); |
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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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if (ac || *s == '-') |
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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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} |
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void |
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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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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,VIEWSTR,"rpict","rview","pinterp",NULL}; |
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static char *altname[]={NULL,VIEWSTR,"rpict","rview","rvu","rpiece","pinterp",NULL}; |
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extern char *progname; |
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register char *cp; |
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register char **an; |
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static int |
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gethview(s, v) /* get view from header */ |
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char *s; |
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register struct myview *v; |
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gethview( /* get view from header */ |
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char *s, |
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void *v |
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) |
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{ |
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if (isview(s) && sscanview(v->hv, s) > 0) |
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v->ok++; |
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if (isview(s) && sscanview(((struct myview*)v)->hv, s) > 0) |
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((struct myview*)v)->ok++; |
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return(0); |
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} |
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struct myview mvs; |
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FILE *fp; |
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if ((fp = fopen(fname, "r")) == NULL) |
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if (fname == NULL || !strcmp(fname, "-")) |
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fp = stdin; |
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else if ((fp = fopen(fname, "r")) == NULL) |
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return(-1); |
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mvs.hv = vp; |
