src/common/image.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  image.c - routines for image generation.
 *
 *     10/17/85
 */

#include  "standard.h"

#include  "view.h"

#include  "resolu.h"

#include  "paths.h"

VIEW  stdview = STDVIEW;                /* default view parameters */


char *
setview(v)              /* set hvec and vvec, return message on error */
register VIEW  *v;
{
        static char  ill_horiz[] = "illegal horizontal view size";
        static char  ill_vert[] = "illegal vertical view size";
        
        if (normalize(v->vdir) == 0.0)          /* normalize direction */
                return("zero view direction");

        if (normalize(v->vup) == 0.0)           /* normalize view up */
                return("zero view up vector");

        fcross(v->hvec, v->vdir, v->vup);       /* compute horiz dir */

        if (normalize(v->hvec) == 0.0)
                return("view up parallel to view direction");

        fcross(v->vvec, v->hvec, v->vdir);      /* compute vert dir */

        if (v->horiz <= FTINY)
                return(ill_horiz);
        if (v->vert <= FTINY)
                return(ill_vert);

        switch (v->type) {
        case VT_PAR:                            /* parallel view */
                v->hn2 = v->horiz;
                v->vn2 = v->vert;
                break;
        case VT_PER:                            /* perspective view */
                if (v->horiz >= 180.0-FTINY)
                        return(ill_horiz);
                if (v->vert >= 180.0-FTINY)
                        return(ill_vert);
                v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
                v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
                break;
        case VT_ANG:                            /* angular fisheye */
                if (v->horiz > 360.0+FTINY)
                        return(ill_horiz);
                if (v->vert > 360.0+FTINY)
                        return(ill_vert);
                v->hn2 = v->horiz / 90.0;
                v->vn2 = v->vert / 90.0;
                break;
        case VT_HEM:                            /* hemispherical fisheye */
                if (v->horiz > 180.0+FTINY)
                        return(ill_horiz);
                if (v->vert > 180.0+FTINY)
                        return(ill_vert);
                v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0));
                v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0));
                break;
        default:
                return("unknown view type");
        }
        if (v->type != VT_ANG) {
                v->hvec[0] *= v->hn2;
                v->hvec[1] *= v->hn2;
                v->hvec[2] *= v->hn2;
                v->vvec[0] *= v->vn2;
                v->vvec[1] *= v->vn2;
                v->vvec[2] *= v->vn2;
        }
        v->hn2 *= v->hn2;
        v->vn2 *= v->vn2;

        return(NULL);
}


normaspect(va, ap, xp, yp)              /* fix pixel aspect or resolution */
double  va;                     /* view aspect ratio */
double  *ap;                    /* pixel aspect in (or out if 0) */
int  *xp, *yp;                  /* x and y resolution in (or out if *ap!=0) */
{
        if (*ap <= FTINY)
                *ap = va * *xp / *yp;           /* compute pixel aspect */
        else if (va * *xp > *ap * *yp)
                *xp = *yp / va * *ap + .5;      /* reduce x resolution */
        else
                *yp = *xp * va / *ap + .5;      /* reduce y resolution */
}


viewray(orig, direc, v, x, y)           /* compute ray origin and direction */
FVECT  orig, direc;
register VIEW  *v;
double  x, y;
{
        double  d, z;
        
        x += v->hoff - 0.5;
        y += v->voff - 0.5;

        switch(v->type) {
        case VT_PAR:                    /* parallel view */
                orig[0] = v->vp[0] + x*v->hvec[0] + y*v->vvec[0];
                orig[1] = v->vp[1] + x*v->hvec[1] + y*v->vvec[1];
                orig[2] = v->vp[2] + x*v->hvec[2] + y*v->vvec[2];
                VCOPY(direc, v->vdir);
                return(0);
        case VT_PER:                    /* perspective view */
                VCOPY(orig, v->vp);
                direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                normalize(direc);
                return(0);
        case VT_HEM:                    /* hemispherical fisheye */
                z = 1.0 - x*x*v->hn2 - y*y*v->vn2;
                if (z < 0.0)
                        return(-1);
                z = sqrt(z);
                VCOPY(orig, v->vp);
                direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                return(0);
        case VT_ANG:                    /* angular fisheye */
                x *= v->horiz/180.0;
                y *= v->vert/180.0;
                d = x*x + y*y;
                if (d > 1.0)
                        return(-1);
                VCOPY(orig, v->vp);
                d = sqrt(d);
                z = cos(PI*d);
                d = d <= FTINY ? PI : sqrt(1 - z*z)/d;
                x *= d;
                y *= d;
                direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0];
                direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1];
                direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2];
                return(0);
        }
        return(-1);
}


viewloc(ip, v, p)               /* find image location for point */
FVECT  ip;
register VIEW  *v;
FVECT  p;
{
        double  d;
        FVECT  disp;

        disp[0] = p[0] - v->vp[0];
        disp[1] = p[1] - v->vp[1];
        disp[2] = p[2] - v->vp[2];

        switch (v->type) {
        case VT_PAR:                    /* parallel view */
                ip[2] = DOT(disp,v->vdir);
                break;
        case VT_PER:                    /* perspective view */
                d = DOT(disp,v->vdir);
                ip[2] = sqrt(DOT(disp,disp));
                if (d < 0.0) {          /* fold pyramid */
                        ip[2] = -ip[2];
                        d = -d;
                } else if (d > FTINY) {
                        d = 1.0/d;
                        disp[0] *= d;
                        disp[1] *= d;
                        disp[2] *= d;
                }
                break;
        case VT_HEM:                    /* hemispherical fisheye */
                d = normalize(disp);
                if (DOT(disp,v->vdir) < 0.0)
                        ip[2] = -d;
                else
                        ip[2] = d;
                break;
        case VT_ANG:                    /* angular fisheye */
                ip[0] = 0.5 - v->hoff;
                ip[1] = 0.5 - v->voff;
                ip[2] = normalize(disp);
                d = DOT(disp,v->vdir);
                if (d >= 1.0-FTINY)
                        return;
                if (d <= -(1.0-FTINY)) {
                        ip[1] += 180.0/v->horiz;
                        ip[2] += 180.0/v->vert;
                        return;
                }
                d = acos(d)/PI / sqrt(1.0 - d*d);
                ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz;
                ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert;
                return;
        }
        ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
        ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
}


pix2loc(loc, rp, px, py)        /* compute image location from pixel pos. */
FLOAT  loc[2];
register RESOLU  *rp;
int  px, py;
{
        register int  x, y;

        if (rp->or & YMAJOR) {
                x = px;
                y = py;
        } else {
                x = py;
                y = px;
        }
        if (rp->or & XDECR)
                x = rp->xr-1 - x;
        if (rp->or & YDECR)
                y = rp->yr-1 - y;
        loc[0] = (x+.5)/rp->xr;
        loc[1] = (y+.5)/rp->yr;
}


loc2pix(pp, rp, lx, ly)         /* compute pixel pos. from image location */
int  pp[2];
register RESOLU  *rp;
double  lx, ly;
{
        register int  x, y;

        x = lx * rp->xr;
        y = ly * rp->yr;
        if (rp->or & XDECR)
                x = rp->xr-1 - x;
        if (rp->or & YDECR)
                y = rp->yr-1 - y;
        if (rp->or & YMAJOR) {
                pp[0] = x;
                pp[1] = y;
        } else {
                pp[0] = y;
                pp[1] = x;
        }
}


int
getviewopt(v, ac, av)                   /* process view argument */
register VIEW  *v;
int  ac;
register char  *av[];
{
#define check(c,l)      if ((av[0][c]&&av[0][c]!=' ') || \
                        badarg(ac-1,av+1,l)) return(-1)

        if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v')
                return(-1);
        switch (av[0][2]) {
        case 't':                       /* type */
                if (!av[0][3] || av[0][3]==' ')
                        return(-1);
                check(4,"");
                v->type = av[0][3];
                return(0);
        case 'p':                       /* point */
                check(3,"fff");
                v->vp[0] = atof(av[1]);
                v->vp[1] = atof(av[2]);
                v->vp[2] = atof(av[3]);
                return(3);
        case 'd':                       /* direction */
                check(3,"fff");
                v->vdir[0] = atof(av[1]);
                v->vdir[1] = atof(av[2]);
                v->vdir[2] = atof(av[3]);
                return(3);
        case 'u':                       /* up */
                check(3,"fff");
                v->vup[0] = atof(av[1]);
                v->vup[1] = atof(av[2]);
                v->vup[2] = atof(av[3]);
                return(3);
        case 'h':                       /* horizontal size */
                check(3,"f");
                v->horiz = atof(av[1]);
                return(1);
        case 'v':                       /* vertical size */
                check(3,"f");
                v->vert = atof(av[1]);
                return(1);
        case 's':                       /* shift */
                check(3,"f");
                v->hoff = atof(av[1]);
                return(1);
        case 'l':                       /* lift */
                check(3,"f");
                v->voff = atof(av[1]);
                return(1);
        default:
                return(-1);
        }
#undef check
}


int
sscanview(vp, s)                        /* get view parameters from string */
VIEW  *vp;
register char  *s;
{
        int  ac;
        char  *av[4];
        int  na;
        int  nvopts = 0;

        if (*s != '-')
                s = sskip(s);
        while (*s) {
                ac = 0;
                do {
                        av[ac++] = s;
                        while (*s && *s != ' ')
                                s++;
                        while (*s == ' ')
                                s++;
                } while (*s && ac < 4);
                if ((na = getviewopt(vp, ac, av)) >= 0) {
                        if (na+1 < ac)
                                s = av[na+1];
                        nvopts++;
                } else if (ac > 1)
                        s = av[1];
        }
        return(nvopts);
}


fprintview(vp, fp)                      /* write out view parameters */
register VIEW  *vp;
FILE  *fp;
{
        fprintf(fp, " -vt%c", vp->type);
        fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
        fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]);
        fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
        fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
        fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
}


int
isview(s)                               /* is this a view string? */
char  *s;
{
        static char  *altname[]={NULL,VIEWSTR,"rpict","rview","pinterp",NULL};
        extern char  *progname;
        register char  *cp;
        register char  **an;
                                        /* add program name to list */
        if (altname[0] == NULL) {
                for (cp = progname; *cp; cp++)
                        ;
                while (cp > progname && !ISDIRSEP(cp[-1]))
                        cp--;
                altname[0] = cp;
        }
                                        /* skip leading path */
        cp = s;
        while (*cp && *cp != ' ')
                cp++;
        while (cp > s && !ISDIRSEP(cp[-1]))
                cp--;
        for (an = altname; *an != NULL; an++)
                if (!strncmp(*an, cp, strlen(*an)))
                        return(1);
        return(0);
}


struct myview {
        VIEW    *hv;
        int     ok;
};


static
gethview(s, v)                          /* get view from header */
char  *s;
register struct myview  *v;
{
        if (isview(s) && sscanview(v->hv, s) > 0)
                v->ok++;
}


int
viewfile(fname, vp, rp)                 /* get view from file */
char  *fname;
VIEW  *vp;
RESOLU  *rp;
{
        struct myview   mvs;
        FILE  *fp;

        if ((fp = fopen(fname, "r")) == NULL)
                return(-1);

        mvs.hv = vp;
        mvs.ok = 0;

        getheader(fp, gethview, &mvs);

        if (rp != NULL && !fgetsresolu(rp, fp))
                mvs.ok = 0;

        fclose(fp);

        return(mvs.ok);
}
Revision:	2.6
Committed:	Sat Dec 5 16:23:37 1992 UTC (31 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.5:	+1 -5 lines
Log Message:	fixed bug in -vta type with -DSMLFLT option in viewray()
#	User	Rev	Content
1	greg	2.4	/* Copyright (c) 1992 Regents of the University of California */
2	greg	1.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* image.c - routines for image generation.
9			*
10			* 10/17/85
11			*/
12
13			#include "standard.h"
14
15			#include "view.h"
16
17	greg	1.17	#include "resolu.h"
18
19	greg	2.4	#include "paths.h"
20
21	greg	1.5	VIEW stdview = STDVIEW; /* default view parameters */
22	greg	1.1
23
24			char *
25	greg	1.5	setview(v) /* set hvec and vvec, return message on error */
26			register VIEW *v;
27	greg	1.3	{
28	greg	1.12	static char ill_horiz[] = "illegal horizontal view size";
29			static char ill_vert[] = "illegal vertical view size";
30
31	greg	1.1	if (normalize(v->vdir) == 0.0) /* normalize direction */
32			return("zero view direction");
33
34	greg	1.14	if (normalize(v->vup) == 0.0) /* normalize view up */
35			return("zero view up vector");
36
37	greg	1.5	fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */
38
39			if (normalize(v->hvec) == 0.0)
40	greg	1.14	return("view up parallel to view direction");
41	greg	1.1
42	greg	1.5	fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */
43
44	greg	1.12	if (v->horiz <= FTINY)
45			return(ill_horiz);
46			if (v->vert <= FTINY)
47			return(ill_vert);
48
49			switch (v->type) {
50			case VT_PAR: /* parallel view */
51	greg	1.5	v->hn2 = v->horiz;
52	greg	1.12	v->vn2 = v->vert;
53			break;
54			case VT_PER: /* perspective view */
55			if (v->horiz >= 180.0-FTINY)
56			return(ill_horiz);
57			if (v->vert >= 180.0-FTINY)
58			return(ill_vert);
59	greg	1.5	v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0));
60	greg	1.12	v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0));
61			break;
62			case VT_ANG: /* angular fisheye */
63			if (v->horiz > 360.0+FTINY)
64			return(ill_horiz);
65			if (v->vert > 360.0+FTINY)
66			return(ill_vert);
67			v->hn2 = v->horiz / 90.0;
68			v->vn2 = v->vert / 90.0;
69			break;
70			case VT_HEM: /* hemispherical fisheye */
71			if (v->horiz > 180.0+FTINY)
72			return(ill_horiz);
73			if (v->vert > 180.0+FTINY)
74			return(ill_vert);
75			v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0));
76			v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0));
77			break;
78			default:
79	greg	1.1	return("unknown view type");
80	greg	1.12	}
81	greg	1.13	if (v->type != VT_ANG) {
82	greg	1.12	v->hvec[0] *= v->hn2;
83			v->hvec[1] *= v->hn2;
84			v->hvec[2] *= v->hn2;
85			v->vvec[0] *= v->vn2;
86			v->vvec[1] *= v->vn2;
87			v->vvec[2] *= v->vn2;
88			}
89	greg	1.5	v->hn2 *= v->hn2;
90			v->vn2 *= v->vn2;
91	greg	1.1
92			return(NULL);
93			}
94
95
96	greg	1.7	normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */
97			double va; /* view aspect ratio */
98			double ap; / pixel aspect in (or out if 0) */
99			int xp, yp; /* x and y resolution in (or out if ap!=0) /
100	greg	1.6	{
101			if (*ap <= FTINY)
102	greg	1.7	ap = va xp / yp; /* compute pixel aspect */
103	greg	1.6	else if (va * xp > ap * *yp)
104	greg	1.10	xp = yp / va * ap + .5; / reduce x resolution */
105	greg	1.6	else
106	greg	1.10	yp = xp * va / ap + .5; / reduce y resolution */
107	greg	1.6	}
108
109
110	greg	1.5	viewray(orig, direc, v, x, y) /* compute ray origin and direction */
111	greg	1.1	FVECT orig, direc;
112			register VIEW *v;
113			double x, y;
114			{
115	greg	1.12	double d, z;
116
117	greg	1.5	x += v->hoff - 0.5;
118			y += v->voff - 0.5;
119	greg	1.1
120	greg	1.12	switch(v->type) {
121			case VT_PAR: /* parallel view */
122	greg	1.5	orig[0] = v->vp[0] + xv->hvec[0] + yv->vvec[0];
123			orig[1] = v->vp[1] + xv->hvec[1] + yv->vvec[1];
124			orig[2] = v->vp[2] + xv->hvec[2] + yv->vvec[2];
125	greg	1.1	VCOPY(direc, v->vdir);
126	greg	1.12	return(0);
127			case VT_PER: /* perspective view */
128	greg	1.1	VCOPY(orig, v->vp);
129	greg	1.5	direc[0] = v->vdir[0] + xv->hvec[0] + yv->vvec[0];
130			direc[1] = v->vdir[1] + xv->hvec[1] + yv->vvec[1];
131			direc[2] = v->vdir[2] + xv->hvec[2] + yv->vvec[2];
132	greg	1.1	normalize(direc);
133	greg	1.12	return(0);
134			case VT_HEM: /* hemispherical fisheye */
135	greg	1.13	z = 1.0 - xxv->hn2 - yyv->vn2;
136	greg	1.12	if (z < 0.0)
137			return(-1);
138			z = sqrt(z);
139			VCOPY(orig, v->vp);
140			direc[0] = zv->vdir[0] + xv->hvec[0] + y*v->vvec[0];
141			direc[1] = zv->vdir[1] + xv->hvec[1] + y*v->vvec[1];
142			direc[2] = zv->vdir[2] + xv->hvec[2] + y*v->vvec[2];
143			return(0);
144			case VT_ANG: /* angular fisheye */
145			x *= v->horiz/180.0;
146			y *= v->vert/180.0;
147			d = xx + yy;
148			if (d > 1.0)
149			return(-1);
150			VCOPY(orig, v->vp);
151			d = sqrt(d);
152			z = cos(PI*d);
153	greg	2.6	d = d <= FTINY ? PI : sqrt(1 - z*z)/d;
154	greg	1.12	x *= d;
155			y *= d;
156			direc[0] = zv->vdir[0] + xv->hvec[0] + y*v->vvec[0];
157			direc[1] = zv->vdir[1] + xv->hvec[1] + y*v->vvec[1];
158			direc[2] = zv->vdir[2] + xv->hvec[2] + y*v->vvec[2];
159			return(0);
160	greg	1.1	}
161	greg	1.12	return(-1);
162	greg	1.1	}
163
164
165	greg	1.17	viewloc(ip, v, p) /* find image location for point */
166			FVECT ip;
167	greg	1.3	register VIEW *v;
168			FVECT p;
169			{
170			double d;
171			FVECT disp;
172	greg	1.5
173	greg	1.3	disp[0] = p[0] - v->vp[0];
174			disp[1] = p[1] - v->vp[1];
175			disp[2] = p[2] - v->vp[2];
176
177	greg	1.12	switch (v->type) {
178			case VT_PAR: /* parallel view */
179	greg	1.17	ip[2] = DOT(disp,v->vdir);
180	greg	1.13	break;
181	greg	1.12	case VT_PER: /* perspective view */
182	greg	1.11	d = DOT(disp,v->vdir);
183	greg	1.17	ip[2] = sqrt(DOT(disp,disp));
184			if (d < 0.0) { /* fold pyramid */
185			ip[2] = -ip[2];
186	greg	1.11	d = -d;
187	greg	1.17	} else if (d > FTINY) {
188	greg	1.11	d = 1.0/d;
189			disp[0] *= d;
190			disp[1] *= d;
191			disp[2] *= d;
192			}
193	greg	1.13	break;
194	greg	1.12	case VT_HEM: /* hemispherical fisheye */
195			d = normalize(disp);
196	greg	1.17	if (DOT(disp,v->vdir) < 0.0)
197			ip[2] = -d;
198			else
199			ip[2] = d;
200	greg	1.13	break;
201	greg	1.12	case VT_ANG: /* angular fisheye */
202	greg	1.17	ip[0] = 0.5 - v->hoff;
203			ip[1] = 0.5 - v->voff;
204			ip[2] = normalize(disp);
205	greg	1.12	d = DOT(disp,v->vdir);
206			if (d >= 1.0-FTINY)
207			return;
208			if (d <= -(1.0-FTINY)) {
209	greg	1.17	ip[1] += 180.0/v->horiz;
210			ip[2] += 180.0/v->vert;
211	greg	1.12	return;
212			}
213			d = acos(d)/PI / sqrt(1.0 - d*d);
214	greg	1.17	ip[0] += DOT(disp,v->hvec)d180.0/v->horiz;
215			ip[1] += DOT(disp,v->vvec)d180.0/v->vert;
216	greg	1.12	return;
217	greg	1.3	}
218	greg	1.17	ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff;
219			ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff;
220	greg	1.3	}
221
222
223	greg	1.17	pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */
224			FLOAT loc[2];
225			register RESOLU *rp;
226			int px, py;
227			{
228			register int x, y;
229
230			if (rp->or & YMAJOR) {
231			x = px;
232			y = py;
233			} else {
234			x = py;
235			y = px;
236			}
237			if (rp->or & XDECR)
238			x = rp->xr-1 - x;
239			if (rp->or & YDECR)
240			y = rp->yr-1 - y;
241			loc[0] = (x+.5)/rp->xr;
242			loc[1] = (y+.5)/rp->yr;
243			}
244
245
246			loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */
247			int pp[2];
248			register RESOLU *rp;
249			double lx, ly;
250			{
251			register int x, y;
252
253			x = lx * rp->xr;
254			y = ly * rp->yr;
255			if (rp->or & XDECR)
256			x = rp->xr-1 - x;
257			if (rp->or & YDECR)
258			y = rp->yr-1 - y;
259			if (rp->or & YMAJOR) {
260			pp[0] = x;
261			pp[1] = y;
262			} else {
263			pp[0] = y;
264			pp[1] = x;
265			}
266			}
267
268
269	greg	1.5	int
270			getviewopt(v, ac, av) /* process view argument */
271			register VIEW *v;
272			int ac;
273			register char *av[];
274			{
275	greg	1.16	#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') \|\| \
276			badarg(ac-1,av+1,l)) return(-1)
277	greg	1.5
278	greg	1.9	if (ac <= 0 \|\| av[0][0] != '-' \|\| av[0][1] != 'v')
279	greg	1.5	return(-1);
280			switch (av[0][2]) {
281			case 't': /* type */
282			if (!av[0][3] \|\| av[0][3]==' ')
283			return(-1);
284	greg	1.16	check(4,"");
285	greg	1.5	v->type = av[0][3];
286			return(0);
287			case 'p': /* point */
288	greg	1.16	check(3,"fff");
289	greg	1.5	v->vp[0] = atof(av[1]);
290			v->vp[1] = atof(av[2]);
291			v->vp[2] = atof(av[3]);
292			return(3);
293			case 'd': /* direction */
294	greg	1.16	check(3,"fff");
295	greg	1.5	v->vdir[0] = atof(av[1]);
296			v->vdir[1] = atof(av[2]);
297			v->vdir[2] = atof(av[3]);
298			return(3);
299			case 'u': /* up */
300	greg	1.16	check(3,"fff");
301	greg	1.5	v->vup[0] = atof(av[1]);
302			v->vup[1] = atof(av[2]);
303			v->vup[2] = atof(av[3]);
304			return(3);
305			case 'h': /* horizontal size */
306	greg	1.16	check(3,"f");
307	greg	1.5	v->horiz = atof(av[1]);
308			return(1);
309			case 'v': /* vertical size */
310	greg	1.16	check(3,"f");
311	greg	1.5	v->vert = atof(av[1]);
312			return(1);
313			case 's': /* shift */
314	greg	1.16	check(3,"f");
315	greg	1.5	v->hoff = atof(av[1]);
316			return(1);
317			case 'l': /* lift */
318	greg	1.16	check(3,"f");
319	greg	1.5	v->voff = atof(av[1]);
320			return(1);
321			default:
322			return(-1);
323			}
324			#undef check
325			}
326
327
328			int
329			sscanview(vp, s) /* get view parameters from string */
330			VIEW *vp;
331	greg	1.1	register char *s;
332			{
333	greg	1.5	int ac;
334			char *av[4];
335			int na;
336			int nvopts = 0;
337
338	greg	2.3	if (*s != '-')
339			s = sskip(s);
340	greg	1.9	while (*s) {
341	greg	1.5	ac = 0;
342			do {
343			av[ac++] = s;
344			while (s && s != ' ')
345			s++;
346			while (*s == ' ')
347			s++;
348			} while (*s && ac < 4);
349			if ((na = getviewopt(vp, ac, av)) >= 0) {
350			if (na+1 < ac)
351			s = av[na+1];
352			nvopts++;
353	greg	1.9	} else if (ac > 1)
354			s = av[1];
355			}
356	greg	1.5	return(nvopts);
357	greg	1.1	}
358
359
360			fprintview(vp, fp) /* write out view parameters */
361			register VIEW *vp;
362			FILE *fp;
363			{
364			fprintf(fp, " -vt%c", vp->type);
365			fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]);
366			fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]);
367			fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]);
368			fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert);
369	greg	1.9	fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff);
370	greg	1.1	}
371
372
373	greg	2.3	int
374			isview(s) /* is this a view string? */
375			char *s;
376			{
377	greg	2.5	static char *altname[]={NULL,VIEWSTR,"rpict","rview","pinterp",NULL};
378			extern char *progname;
379	greg	2.3	register char *cp;
380			register char **an;
381			/* add program name to list */
382	greg	2.5	if (altname[0] == NULL) {
383			for (cp = progname; *cp; cp++)
384			;
385			while (cp > progname && !ISDIRSEP(cp[-1]))
386			cp--;
387			altname[0] = cp;
388			}
389	greg	2.3	/* skip leading path */
390			cp = s;
391			while (cp && cp != ' ')
392			cp++;
393	greg	2.5	while (cp > s && !ISDIRSEP(cp[-1]))
394	greg	2.3	cp--;
395			for (an = altname; *an != NULL; an++)
396			if (!strncmp(an, cp, strlen(an)))
397			return(1);
398			return(0);
399			}
400	greg	1.1
401	greg	2.3
402	greg	1.15	struct myview {
403			VIEW *hv;
404			int ok;
405			};
406	greg	1.1
407	greg	1.15
408	greg	1.1	static
409	greg	1.15	gethview(s, v) /* get view from header */
410	greg	1.1	char *s;
411	greg	1.15	register struct myview *v;
412	greg	1.1	{
413	greg	2.3	if (isview(s) && sscanview(v->hv, s) > 0)
414			v->ok++;
415	greg	1.1	}
416
417
418			int
419	greg	1.17	viewfile(fname, vp, rp) /* get view from file */
420	greg	1.1	char *fname;
421			VIEW *vp;
422	greg	1.17	RESOLU *rp;
423	greg	1.1	{
424	greg	1.15	struct myview mvs;
425	greg	1.1	FILE *fp;
426
427			if ((fp = fopen(fname, "r")) == NULL)
428			return(-1);
429
430	greg	1.15	mvs.hv = vp;
431			mvs.ok = 0;
432	greg	1.1
433	greg	1.15	getheader(fp, gethview, &mvs);
434	greg	1.8
435	greg	1.17	if (rp != NULL && !fgetsresolu(rp, fp))
436	greg	1.15	mvs.ok = 0;
437	greg	1.1
438			fclose(fp);
439
440	greg	1.15	return(mvs.ok);
441	greg	1.1	}