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#include "view.h" |
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< |
VIEW stdview = STDVIEW(512); /* default view parameters */ |
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> |
VIEW stdview = STDVIEW; /* 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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> |
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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double tan(), dt; |
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> |
extern double tan(), normalize(); |
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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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– |
fcross(v->vhinc, v->vdir, v->vup); /* compute horiz dir */ |
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< |
if (normalize(v->vhinc) == 0.0) |
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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("illegal view up vector"); |
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– |
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fcross(v->vvinc, v->vhinc, v->vdir); /* compute vert dir */ |
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fcross(v->vvec, v->hvec, 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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v->hn2 = 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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v->hn2 = 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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if (v->hn2 <= FTINY || v->hn2 >= 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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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->hn2 *= v->hn2; |
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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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– |
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if (v->type == VT_PAR) |
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dt = v->vert; |
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v->vn2 = 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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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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if (dt <= FTINY || dt >= FHUGE) |
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> |
if (v->vn2 <= FTINY || v->vn2 >= 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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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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v->vn2 *= v->vn2; |
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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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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; /* reduce x resolution */ |
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else |
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*yp = *xp * va / *ap; /* reduce y resolution */ |
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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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register int i; |
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> |
x += v->hoff - 0.5; |
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> |
y += v->voff - 0.5; |
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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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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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} 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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> |
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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} |
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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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> |
viewpixel(xp, yp, zp, v, p) /* find image location for point */ |
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> |
double *xp, *yp, *zp; |
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register VIEW *v; |
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FVECT p; |
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{ |
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extern double sqrt(); |
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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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> |
if (v->type == VT_PAR) { /* parallel view */ |
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> |
if (zp != NULL) |
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*zp = DOT(disp,v->vdir); |
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} else { /* perspective view */ |
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> |
d = 1.0/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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> |
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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> |
*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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} |
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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,n) if ((av[0][c]&&av[0][c]!=' ') || n>=ac) return(-1) |
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extern double atof(); |
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> |
|
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if (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(4,0); |
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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(3,3); |
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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(3,3); |
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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(3,3); |
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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(3,1); |
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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(3,1); |
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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(3,1); |
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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(3,1); |
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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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< |
for ( ; ; ) |
| 202 |
< |
switch (*s++) { |
| 203 |
< |
case '\0': |
| 204 |
< |
case '\n': |
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< |
return(0); |
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< |
case '-': |
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< |
switch (*s++) { |
| 208 |
< |
case '\0': |
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< |
return(-1); |
| 210 |
< |
case 'x': |
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< |
if (sscanf(s, "%d", &vp->hresolu) != 1) |
| 212 |
< |
return(-1); |
| 213 |
< |
s = sskip(s); |
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< |
continue; |
| 215 |
< |
case 'y': |
| 216 |
< |
if (sscanf(s, "%d", &vp->vresolu) != 1) |
| 217 |
< |
return(-1); |
| 218 |
< |
s = sskip(s); |
| 219 |
< |
continue; |
| 220 |
< |
case 'v': |
| 121 |
< |
switch (*s++) { |
| 122 |
< |
case '\0': |
| 123 |
< |
return(-1); |
| 124 |
< |
case 't': |
| 125 |
< |
vp->type = *s++; |
| 126 |
< |
continue; |
| 127 |
< |
case 'p': |
| 128 |
< |
if (sscanf(s, "%lf %lf %lf", |
| 129 |
< |
&vp->vp[0], |
| 130 |
< |
&vp->vp[1], |
| 131 |
< |
&vp->vp[2]) != 3) |
| 132 |
< |
return(-1); |
| 133 |
< |
s = sskip(sskip(sskip(s))); |
| 134 |
< |
continue; |
| 135 |
< |
case 'd': |
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< |
if (sscanf(s, "%lf %lf %lf", |
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< |
&vp->vdir[0], |
| 138 |
< |
&vp->vdir[1], |
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< |
&vp->vdir[2]) != 3) |
| 140 |
< |
return(-1); |
| 141 |
< |
s = sskip(sskip(sskip(s))); |
| 142 |
< |
continue; |
| 143 |
< |
case 'u': |
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< |
if (sscanf(s, "%lf %lf %lf", |
| 145 |
< |
&vp->vup[0], |
| 146 |
< |
&vp->vup[1], |
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< |
&vp->vup[2]) != 3) |
| 148 |
< |
return(-1); |
| 149 |
< |
s = sskip(sskip(sskip(s))); |
| 150 |
< |
continue; |
| 151 |
< |
case 'h': |
| 152 |
< |
if (sscanf(s, "%lf", |
| 153 |
< |
&vp->horiz) != 1) |
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< |
return(-1); |
| 155 |
< |
s = sskip(s); |
| 156 |
< |
continue; |
| 157 |
< |
case 'v': |
| 158 |
< |
if (sscanf(s, "%lf", |
| 159 |
< |
&vp->vert) != 1) |
| 160 |
< |
return(-1); |
| 161 |
< |
s = sskip(s); |
| 162 |
< |
continue; |
| 163 |
< |
} |
| 164 |
< |
continue; |
| 165 |
< |
} |
| 166 |
< |
continue; |
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> |
int ac; |
| 202 |
> |
char *av[4]; |
| 203 |
> |
int na; |
| 204 |
> |
int nvopts = 0; |
| 205 |
> |
|
| 206 |
> |
while (*s == ' ') |
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> |
s++; |
| 208 |
> |
do { |
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> |
ac = 0; |
| 210 |
> |
do { |
| 211 |
> |
av[ac++] = s; |
| 212 |
> |
while (*s && *s != ' ') |
| 213 |
> |
s++; |
| 214 |
> |
while (*s == ' ') |
| 215 |
> |
s++; |
| 216 |
> |
} while (*s && ac < 4); |
| 217 |
> |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
| 218 |
> |
if (na+1 < ac) |
| 219 |
> |
s = av[na+1]; |
| 220 |
> |
nvopts++; |
| 221 |
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} |
| 222 |
+ |
} while (*s); |
| 223 |
+ |
return(nvopts); |
| 224 |
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} |
| 225 |
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|
| 226 |
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|
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fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
| 234 |
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fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
| 235 |
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fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
| 236 |
< |
fprintf(fp, " -x %d -y %d", vp->hresolu, vp->vresolu); |
| 236 |
> |
fprintf(fp, " -vs %d -vl %d", vp->hoff, vp->voff); |
| 237 |
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} |
| 238 |
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|
| 239 |
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|
| 240 |
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static VIEW *hview; /* view from header */ |
| 241 |
|
static int gothview; /* success indicator */ |
| 242 |
< |
static char *altname[] = {NULL,"rpict","rview",VIEWSTR,NULL}; |
| 242 |
> |
static char *altname[] = {NULL,"rpict","rview","pinterp",VIEWSTR,NULL}; |
| 243 |
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| 244 |
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| 245 |
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static |
| 250 |
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|
| 251 |
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for (an = altname; *an != NULL; an++) |
| 252 |
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if (!strncmp(*an, s, strlen(*an))) { |
| 253 |
< |
if (sscanview(hview, s+strlen(*an)) == 0) |
| 253 |
> |
if (sscanview(hview, s+strlen(*an)) > 0) |
| 254 |
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gothview++; |
| 255 |
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return; |
| 256 |
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} |
