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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1991 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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#include "view.h" |
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#include "resolu.h" |
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VIEW stdview = STDVIEW; /* default view parameters */ |
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} |
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viewpixel(xp, yp, zp, v, p) /* find image location for point */ |
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double *xp, *yp, *zp; |
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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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switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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if (zp != NULL) |
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*zp = DOT(disp,v->vdir); |
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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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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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if (d < 0.0) /* fold pyramid */ |
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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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if (d > FTINY) { |
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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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break; |
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case VT_HEM: /* hemispherical fisheye */ |
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d = normalize(disp); |
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if (zp != NULL) { |
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if (DOT(disp,v->vdir) < 0.0) |
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*zp = -d; |
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else |
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*zp = d; |
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} |
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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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d = normalize(disp); |
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if (zp != NULL) |
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*zp = d; |
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*xp = 0.5 - v->hoff; |
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*yp = 0.5 - v->voff; |
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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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*xp += 180.0/v->horiz; |
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*yp += 180.0/v->vert; |
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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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*xp += DOT(disp,v->hvec)*d*180.0/v->horiz; |
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*yp += DOT(disp,v->vvec)*d*180.0/v->vert; |
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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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*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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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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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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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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int |
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getviewopt(v, ac, av) /* process view argument */ |
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register VIEW *v; |
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int |
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viewfile(fname, vp, xp, yp) /* get view from file */ |
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viewfile(fname, vp, rp) /* get view from file */ |
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char *fname; |
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VIEW *vp; |
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int *xp, *yp; |
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RESOLU *rp; |
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{ |
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extern char *progname; |
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struct myview mvs; |
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getheader(fp, gethview, &mvs); |
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if (xp != NULL && yp != NULL |
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&& fgetresolu(xp, yp, fp) == -1) |
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if (rp != NULL && !fgetsresolu(rp, fp)) |
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mvs.ok = 0; |
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fclose(fp); |
