src/rt/rv3.c

/* Copyright (c) 1987 Regents of the University of California */

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

/*
 *  rv3.c - miscellaneous routines for rview.
 *
 *     5/11/87
 */

#include  "ray.h"

#include  "octree.h"

#include  "rpaint.h"

#include  "random.h"

#ifndef WFLUSH
#define WFLUSH          30              /* flush after this many rays */
#endif

#ifdef  SMLFLT
#define  sscanvec(s,v)  (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
#else
#define  sscanvec(s,v)  (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
#endif


getrect(s, r)                           /* get a box */
char  *s;
register RECT  *r;
{
        int  x0, y0, x1, y1;

        if (*s && !strncmp(s, "all", strlen(s))) {
                r->l = r->d = 0;
                r->r = hresolu;
                r->u = vresolu;
                return(0);
        }
        if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
                if (dev->getcur == NULL)
                        return(-1);
                (*dev->comout)("Pick first corner\n");
                if ((*dev->getcur)(&x0, &y0) == ABORT)
                        return(-1);
                (*dev->comout)("Pick second corner\n");
                if ((*dev->getcur)(&x1, &y1) == ABORT)
                        return(-1);
        }
        if (x0 < x1) {
                r->l = x0;
                r->r = x1;
        } else {
                r->l = x1;
                r->r = x0;
        }
        if (y0 < y1) {
                r->d = y0;
                r->u = y1;
        } else {
                r->d = y1;
                r->u = y0;
        }
        if (r->l < 0) r->l = 0;
        if (r->d < 0) r->d = 0;
        if (r->r > hresolu) r->r = hresolu;
        if (r->u > vresolu) r->u = vresolu;
        if (r->l > r->r) r->l = r->r;
        if (r->d > r->u) r->d = r->u;
        return(0);
}


getinterest(s, direc, vec, mp)          /* get area of interest */
char  *s;
int  direc;
FVECT  vec;
double  *mp;
{
        int  x, y;
        RAY  thisray;
        register int  i;

        if (sscanf(s, "%lf", mp) != 1)
                *mp = 1.0;
        else if (*mp < -FTINY)          /* negative zoom is reduction */
                *mp = -1.0 / *mp;
        else if (*mp <= FTINY) {        /* too small */
                error(COMMAND, "illegal magnification");
                return(-1);
        }
        if (!sscanvec(sskip(s), vec)) {
                if (dev->getcur == NULL)
                        return(-1);
                (*dev->comout)("Pick view center\n");
                if ((*dev->getcur)(&x, &y) == ABORT)
                        return(-1);
                if (viewray(thisray.rorg, thisray.rdir, &ourview,
                                (x+.5)/hresolu, (y+.5)/vresolu) < 0) {
                        error(COMMAND, "not on image");
                        return(-1);
                }
                if (!direc || ourview.type == VT_PAR) {
                        rayorigin(&thisray, NULL, PRIMARY, 1.0);
                        if (!localhit(&thisray, &thescene)) {
                                error(COMMAND, "not a local object");
                                return(-1);
                        }
                }
                if (direc)
                        if (ourview.type == VT_PAR)
                                for (i = 0; i < 3; i++)
                                        vec[i] = thisray.rop[i] - ourview.vp[i];
                        else
                                VCOPY(vec, thisray.rdir);
                else
                        VCOPY(vec, thisray.rop);
        } else if (direc)
                        for (i = 0; i < 3; i++)
                                vec[i] -= ourview.vp[i];
        return(0);
}


float *         /* keep consistent with COLOR typedef */
greyof(col)                             /* convert color to greyscale */
register COLOR  col;
{
        static COLOR  gcol;
        double  b;

        b = bright(col);
        setcolor(gcol, b, b, b);
        return(gcol);
}


paint(p, xmin, ymin, xmax, ymax)        /* compute and paint a rectangle */
register PNODE  *p;
int  xmin, ymin, xmax, ymax;
{
        extern long  nrays;
        static long  lastflush = 0;
        static RAY  thisray;
        double  h, v;

        if (xmax - xmin <= 0 || ymax - ymin <= 0) {     /* empty */
                p->x = xmin;
                p->y = ymin;
                setcolor(p->v, 0.0, 0.0, 0.0);
                return;
        }
                                                /* jitter ray direction */
        h = xmin + (xmax-xmin)*frandom();
        v = ymin + (ymax-ymin)*frandom();
        
        if (viewray(thisray.rorg, thisray.rdir, &ourview,
                        h/hresolu, v/vresolu) < 0) {
                setcolor(thisray.rcol, 0.0, 0.0, 0.0);
        } else {
                rayorigin(&thisray, NULL, PRIMARY, 1.0);
                samplendx++;
                rayvalue(&thisray);
        }

        p->x = h;
        p->y = v;
        copycolor(p->v, thisray.rcol);
        scalecolor(p->v, exposure);

        (*dev->paintr)(greyscale?greyof(p->v):p->v, xmin, ymin, xmax, ymax);

        if (dev->flush != NULL && nrays - lastflush >= WFLUSH) {
                lastflush = nrays;
                (*dev->flush)();
        }
}


newimage()                              /* start a new image */
{
                                                /* free old image */
        freepkids(&ptrunk);
                                                /* save reserve memory */
        fillreserves();
                                                /* compute resolution */
        hresolu = dev->xsiz;
        vresolu = dev->ysiz;
        normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
        pframe.l = pframe.d = 0;
        pframe.r = hresolu; pframe.u = vresolu;
        pdepth = 0;
                                                /* clear device */
        (*dev->clear)(hresolu, vresolu);
                                                /* get first value */
        paint(&ptrunk, 0, 0, hresolu, vresolu);
}


redraw()                                /* redraw the image */
{
        (*dev->clear)(hresolu, vresolu);
        (*dev->comout)("redrawing...\n");
        repaint(0, 0, hresolu, vresolu);
        (*dev->comout)("\n");
}


repaint(xmin, ymin, xmax, ymax)                 /* repaint a region */
int  xmin, ymin, xmax, ymax;
{
        RECT  reg;

        reg.l = xmin; reg.r = xmax;
        reg.d = ymin; reg.u = ymax;

        paintrect(&ptrunk, 0, 0, hresolu, vresolu, &reg);
}


paintrect(p, xmin, ymin, xmax, ymax, r)         /* paint picture rectangle */
register PNODE  *p;
int  xmin, ymin, xmax, ymax;
register RECT  *r;
{
        int  mx, my;

        if (xmax - xmin <= 0 || ymax - ymin <= 0)
                return;

        if (p->kid == NULL) {
                (*dev->paintr)(greyscale?greyof(p->v):p->v,
                                xmin, ymin, xmax, ymax);        /* do this */
                return;
        }
        mx = (xmin + xmax) >> 1;                                /* do kids */
        my = (ymin + ymax) >> 1;
        if (mx > r->l) {
                if (my > r->d)
                        paintrect(p->kid+DL, xmin, ymin, mx, my, r);
                if (my < r->u)
                        paintrect(p->kid+UL, xmin, my, mx, ymax, r);
        }
        if (mx < r->r) {
                if (my > r->d)
                        paintrect(p->kid+DR, mx, ymin, xmax, my, r);
                if (my < r->u)
                        paintrect(p->kid+UR, mx, my, xmax, ymax, r);
        }
}


PNODE *
findrect(x, y, p, r, pd)                /* find a rectangle */
int  x, y;
register PNODE  *p;
register RECT  *r;
int  pd;
{
        int  mx, my;

        while (p->kid != NULL && pd--) {

                mx = (r->l + r->r) >> 1;
                my = (r->d + r->u) >> 1;

                if (x < mx) {
                        r->r = mx;
                        if (y < my) {
                                r->u = my;
                                p = p->kid+DL;
                        } else {
                                r->d = my;
                                p = p->kid+UL;
                        }
                } else {
                        r->l = mx;
                        if (y < my) {
                                r->u = my;
                                p = p->kid+DR;
                        } else {
                                r->d = my;
                                p = p->kid+UR;
                        }
                }
        }
        return(p);
}


scalepict(p, sf)                        /* scale picture values */
register PNODE  *p;
double  sf;
{
        scalecolor(p->v, sf);           /* do this node */

        if (p->kid == NULL)
                return;
                                        /* do children */
        scalepict(p->kid+DL, sf);
        scalepict(p->kid+DR, sf);
        scalepict(p->kid+UL, sf);
        scalepict(p->kid+UR, sf);
}


getpictcolrs(yoff, scan, p, xsiz, ysiz) /* get scanline from picture */
int  yoff;
register COLR  *scan;
register PNODE  *p;
int  xsiz, ysiz;
{
        register int  mx;
        int  my;

        if (p->kid == NULL) {                   /* do this node */
                setcolr(scan[0], colval(p->v,RED),
                                colval(p->v,GRN),
                                colval(p->v,BLU));
                for (mx = 1; mx < xsiz; mx++)
                        copycolr(scan[mx], scan[0]);
                return;
        }
                                                /* do kids */
        mx = xsiz >> 1;
        my = ysiz >> 1;
        if (yoff < my) {
                getpictcolrs(yoff, scan, p->kid+DL, mx, my);
                getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
        } else {
                getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
                getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
        }
}


pcopy(p1, p2)                           /* copy paint node p1 into p2 */
register PNODE  *p1, *p2;
{
        copycolor(p2->v, p1->v);
        p2->x = p1->x;
        p2->y = p1->y;
}


freepkids(p)                            /* free pnode's children */
register PNODE  *p;
{
        if (p->kid == NULL)
                return;
        freepkids(p->kid+DL);
        freepkids(p->kid+DR);
        freepkids(p->kid+UL);
        freepkids(p->kid+UR);
        free((char *)p->kid);
        p->kid = NULL;
}


newview(vp)                             /* change viewing parameters */
register VIEW  *vp;
{
        char  *err;

        if ((err = setview(vp)) != NULL) {
                sprintf(errmsg, "view not set - %s", err);
                error(COMMAND, errmsg);
        } else if (bcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) {
                copystruct(&oldview, &ourview);
                copystruct(&ourview, vp);
                newimage();
        }
}


moveview(angle, elev, mag, vc)                  /* move viewpoint */
double  angle, elev, mag;
FVECT  vc;
{
        extern double  sqrt(), dist2();
        double  d;
        FVECT  v1;
        VIEW  nv;
        register int  i;

        VCOPY(nv.vup, ourview.vup);
        nv.hoff = ourview.hoff; nv.voff = ourview.voff;
        spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
        if (elev != 0.0) {
                fcross(v1, ourview.vup, nv.vdir);
                normalize(v1);
                spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
        }
        if ((nv.type = ourview.type) == VT_PAR) {
                nv.horiz = ourview.horiz / mag;
                nv.vert = ourview.vert / mag;
                d = 0.0;                        /* don't move closer */
                for (i = 0; i < 3; i++)
                        d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
        } else {
                nv.horiz = ourview.horiz;
                nv.vert = ourview.vert;
                d = sqrt(dist2(ourview.vp, vc)) / mag;
        }
        for (i = 0; i < 3; i++)
                nv.vp[i] = vc[i] - d*nv.vdir[i];
        newview(&nv);
}


zoomview(vp, zf)                        /* zoom in our out */
register VIEW  *vp;
double  zf;
{
        switch (vp->type) {
        case VT_PAR:                            /* parallel view */
        case VT_ANG:                            /* angular fisheye */
                vp->horiz /= zf;
                vp->vert /= zf;
                return;
        case VT_PER:                            /* perspective view */
                vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
                                (PI/180./2.);
                vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
                                (PI/180./2.);
                return;
        case VT_HEM:                            /* hemispherical fisheye */
                vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
                if (vp->horiz >= 1.0-FTINY)
                        vp->horiz = 180.;
                else
                        vp->horiz = asin(vp->horiz) / (PI/180./2.);
                vp->vert = sin(vp->vert*(PI/180./2.))/zf;
                if (vp->vert >= 1.0-FTINY)
                        vp->vert = 180.;
                else
                        vp->vert = asin(vp->vert) / (PI/180./2.);
                return;
        }
}
Revision:	2.2
Committed:	Fri Jan 17 09:27:21 1992 UTC (32 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.1:	+7 -1 lines
Log Message:	fixed bug in use of scanf() with SMLFLT defined
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1987 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* rv3.c - miscellaneous routines for rview.
9			*
10			* 5/11/87
11			*/
12
13			#include "ray.h"
14
15	greg	1.7	#include "octree.h"
16
17	greg	1.1	#include "rpaint.h"
18
19			#include "random.h"
20	greg	1.7
21	greg	1.13	#ifndef WFLUSH
22			#define WFLUSH 30 /* flush after this many rays */
23			#endif
24	greg	1.7
25	greg	2.2	#ifdef SMLFLT
26			#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
27			#else
28			#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
29			#endif
30	greg	1.13
31	greg	2.2
32	greg	1.7	getrect(s, r) /* get a box */
33			char *s;
34			register RECT *r;
35			{
36			int x0, y0, x1, y1;
37
38			if (*s && !strncmp(s, "all", strlen(s))) {
39			r->l = r->d = 0;
40	greg	1.9	r->r = hresolu;
41			r->u = vresolu;
42	greg	1.7	return(0);
43			}
44			if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
45			if (dev->getcur == NULL)
46			return(-1);
47			(*dev->comout)("Pick first corner\n");
48			if ((*dev->getcur)(&x0, &y0) == ABORT)
49			return(-1);
50			(*dev->comout)("Pick second corner\n");
51			if ((*dev->getcur)(&x1, &y1) == ABORT)
52			return(-1);
53			}
54			if (x0 < x1) {
55			r->l = x0;
56			r->r = x1;
57			} else {
58			r->l = x1;
59			r->r = x0;
60			}
61			if (y0 < y1) {
62			r->d = y0;
63			r->u = y1;
64			} else {
65			r->d = y1;
66			r->u = y0;
67			}
68			if (r->l < 0) r->l = 0;
69			if (r->d < 0) r->d = 0;
70	greg	1.9	if (r->r > hresolu) r->r = hresolu;
71			if (r->u > vresolu) r->u = vresolu;
72	greg	1.7	if (r->l > r->r) r->l = r->r;
73			if (r->d > r->u) r->d = r->u;
74			return(0);
75			}
76
77
78			getinterest(s, direc, vec, mp) /* get area of interest */
79			char *s;
80			int direc;
81			FVECT vec;
82			double *mp;
83			{
84			int x, y;
85			RAY thisray;
86			register int i;
87
88			if (sscanf(s, "%lf", mp) != 1)
89			*mp = 1.0;
90			else if (mp < -FTINY) / negative zoom is reduction */
91			mp = -1.0 / mp;
92			else if (mp <= FTINY) { / too small */
93			error(COMMAND, "illegal magnification");
94			return(-1);
95			}
96	greg	2.2	if (!sscanvec(sskip(s), vec)) {
97	greg	1.7	if (dev->getcur == NULL)
98			return(-1);
99			(*dev->comout)("Pick view center\n");
100			if ((*dev->getcur)(&x, &y) == ABORT)
101			return(-1);
102	greg	1.17	if (viewray(thisray.rorg, thisray.rdir, &ourview,
103			(x+.5)/hresolu, (y+.5)/vresolu) < 0) {
104			error(COMMAND, "not on image");
105			return(-1);
106			}
107	greg	1.7	if (!direc \|\| ourview.type == VT_PAR) {
108			rayorigin(&thisray, NULL, PRIMARY, 1.0);
109			if (!localhit(&thisray, &thescene)) {
110			error(COMMAND, "not a local object");
111			return(-1);
112			}
113			}
114			if (direc)
115			if (ourview.type == VT_PAR)
116			for (i = 0; i < 3; i++)
117			vec[i] = thisray.rop[i] - ourview.vp[i];
118			else
119			VCOPY(vec, thisray.rdir);
120			else
121			VCOPY(vec, thisray.rop);
122			} else if (direc)
123			for (i = 0; i < 3; i++)
124			vec[i] -= ourview.vp[i];
125			return(0);
126			}
127	greg	1.1
128
129			float * /* keep consistent with COLOR typedef */
130			greyof(col) /* convert color to greyscale */
131			register COLOR col;
132			{
133			static COLOR gcol;
134			double b;
135
136			b = bright(col);
137			setcolor(gcol, b, b, b);
138			return(gcol);
139			}
140
141
142			paint(p, xmin, ymin, xmax, ymax) /* compute and paint a rectangle */
143			register PNODE *p;
144			int xmin, ymin, xmax, ymax;
145			{
146	greg	1.13	extern long nrays;
147			static long lastflush = 0;
148	greg	1.1	static RAY thisray;
149			double h, v;
150
151			if (xmax - xmin <= 0 \|\| ymax - ymin <= 0) { /* empty */
152			p->x = xmin;
153			p->y = ymin;
154			setcolor(p->v, 0.0, 0.0, 0.0);
155			return;
156			}
157			/* jitter ray direction */
158	greg	1.15	h = xmin + (xmax-xmin)*frandom();
159			v = ymin + (ymax-ymin)*frandom();
160	greg	1.1
161	greg	1.17	if (viewray(thisray.rorg, thisray.rdir, &ourview,
162			h/hresolu, v/vresolu) < 0) {
163			setcolor(thisray.rcol, 0.0, 0.0, 0.0);
164			} else {
165			rayorigin(&thisray, NULL, PRIMARY, 1.0);
166	greg	1.20	samplendx++;
167	greg	1.17	rayvalue(&thisray);
168			}
169	greg	1.1
170	greg	1.15	p->x = h;
171			p->y = v;
172	greg	1.1	copycolor(p->v, thisray.rcol);
173			scalecolor(p->v, exposure);
174
175			(*dev->paintr)(greyscale?greyof(p->v):p->v, xmin, ymin, xmax, ymax);
176	greg	1.13
177			if (dev->flush != NULL && nrays - lastflush >= WFLUSH) {
178			lastflush = nrays;
179			(*dev->flush)();
180			}
181	greg	1.1	}
182
183
184			newimage() /* start a new image */
185			{
186			/* free old image */
187			freepkids(&ptrunk);
188	greg	1.19	/* save reserve memory */
189			fillreserves();
190	greg	1.9	/* compute resolution */
191	greg	1.10	hresolu = dev->xsiz;
192			vresolu = dev->ysiz;
193	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
194	greg	1.1	pframe.l = pframe.d = 0;
195	greg	1.9	pframe.r = hresolu; pframe.u = vresolu;
196	greg	1.1	pdepth = 0;
197			/* clear device */
198	greg	1.9	(*dev->clear)(hresolu, vresolu);
199	greg	1.1	/* get first value */
200	greg	1.9	paint(&ptrunk, 0, 0, hresolu, vresolu);
201	greg	1.1	}
202
203
204			redraw() /* redraw the image */
205			{
206	greg	1.9	(*dev->clear)(hresolu, vresolu);
207	greg	1.1	(*dev->comout)("redrawing...\n");
208	greg	1.9	repaint(0, 0, hresolu, vresolu);
209	greg	1.1	(*dev->comout)("\n");
210			}
211
212
213			repaint(xmin, ymin, xmax, ymax) /* repaint a region */
214			int xmin, ymin, xmax, ymax;
215			{
216			RECT reg;
217
218			reg.l = xmin; reg.r = xmax;
219			reg.d = ymin; reg.u = ymax;
220
221	greg	1.9	paintrect(&ptrunk, 0, 0, hresolu, vresolu, &reg);
222	greg	1.1	}
223
224
225			paintrect(p, xmin, ymin, xmax, ymax, r) /* paint picture rectangle */
226			register PNODE *p;
227			int xmin, ymin, xmax, ymax;
228			register RECT *r;
229			{
230			int mx, my;
231
232			if (xmax - xmin <= 0 \|\| ymax - ymin <= 0)
233			return;
234
235			if (p->kid == NULL) {
236			(*dev->paintr)(greyscale?greyof(p->v):p->v,
237			xmin, ymin, xmax, ymax); /* do this */
238			return;
239			}
240			mx = (xmin + xmax) >> 1; /* do kids */
241			my = (ymin + ymax) >> 1;
242			if (mx > r->l) {
243			if (my > r->d)
244			paintrect(p->kid+DL, xmin, ymin, mx, my, r);
245			if (my < r->u)
246			paintrect(p->kid+UL, xmin, my, mx, ymax, r);
247			}
248			if (mx < r->r) {
249			if (my > r->d)
250			paintrect(p->kid+DR, mx, ymin, xmax, my, r);
251			if (my < r->u)
252			paintrect(p->kid+UR, mx, my, xmax, ymax, r);
253			}
254			}
255
256
257			PNODE *
258			findrect(x, y, p, r, pd) /* find a rectangle */
259			int x, y;
260			register PNODE *p;
261			register RECT *r;
262			int pd;
263			{
264			int mx, my;
265
266			while (p->kid != NULL && pd--) {
267
268			mx = (r->l + r->r) >> 1;
269			my = (r->d + r->u) >> 1;
270
271			if (x < mx) {
272			r->r = mx;
273			if (y < my) {
274			r->u = my;
275			p = p->kid+DL;
276			} else {
277			r->d = my;
278			p = p->kid+UL;
279			}
280			} else {
281			r->l = mx;
282			if (y < my) {
283			r->u = my;
284			p = p->kid+DR;
285			} else {
286			r->d = my;
287			p = p->kid+UR;
288			}
289			}
290			}
291			return(p);
292			}
293
294
295			scalepict(p, sf) /* scale picture values */
296			register PNODE *p;
297			double sf;
298			{
299			scalecolor(p->v, sf); /* do this node */
300
301			if (p->kid == NULL)
302			return;
303			/* do children */
304			scalepict(p->kid+DL, sf);
305			scalepict(p->kid+DR, sf);
306			scalepict(p->kid+UL, sf);
307			scalepict(p->kid+UR, sf);
308			}
309
310
311			getpictcolrs(yoff, scan, p, xsiz, ysiz) /* get scanline from picture */
312			int yoff;
313			register COLR *scan;
314			register PNODE *p;
315			int xsiz, ysiz;
316			{
317			register int mx;
318			int my;
319
320			if (p->kid == NULL) { /* do this node */
321			setcolr(scan[0], colval(p->v,RED),
322			colval(p->v,GRN),
323			colval(p->v,BLU));
324			for (mx = 1; mx < xsiz; mx++)
325			copycolr(scan[mx], scan[0]);
326			return;
327			}
328			/* do kids */
329			mx = xsiz >> 1;
330			my = ysiz >> 1;
331			if (yoff < my) {
332			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
333			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
334			} else {
335			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
336			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
337			}
338			}
339
340
341			pcopy(p1, p2) /* copy paint node p1 into p2 */
342			register PNODE p1, p2;
343			{
344			copycolor(p2->v, p1->v);
345			p2->x = p1->x;
346			p2->y = p1->y;
347			}
348
349
350			freepkids(p) /* free pnode's children */
351			register PNODE *p;
352			{
353			if (p->kid == NULL)
354			return;
355			freepkids(p->kid+DL);
356			freepkids(p->kid+DR);
357			freepkids(p->kid+UL);
358			freepkids(p->kid+UR);
359			free((char *)p->kid);
360			p->kid = NULL;
361			}
362
363
364			newview(vp) /* change viewing parameters */
365			register VIEW *vp;
366			{
367			char *err;
368
369	greg	1.6	if ((err = setview(vp)) != NULL) {
370	greg	1.1	sprintf(errmsg, "view not set - %s", err);
371			error(COMMAND, errmsg);
372	greg	1.12	} else if (bcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
373			copystruct(&oldview, &ourview);
374			copystruct(&ourview, vp);
375	greg	1.14	newimage();
376	greg	1.1	}
377			}
378
379
380	greg	1.4	moveview(angle, elev, mag, vc) /* move viewpoint */
381			double angle, elev, mag;
382	greg	1.1	FVECT vc;
383			{
384			extern double sqrt(), dist2();
385			double d;
386	greg	1.4	FVECT v1;
387	greg	1.1	VIEW nv;
388			register int i;
389
390			VCOPY(nv.vup, ourview.vup);
391	greg	1.9	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
392	greg	1.1	spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
393	greg	1.4	if (elev != 0.0) {
394	greg	1.5	fcross(v1, ourview.vup, nv.vdir);
395	greg	1.4	normalize(v1);
396			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
397			}
398	greg	1.1	if ((nv.type = ourview.type) == VT_PAR) {
399			nv.horiz = ourview.horiz / mag;
400			nv.vert = ourview.vert / mag;
401	greg	1.3	d = 0.0; /* don't move closer */
402	greg	1.2	for (i = 0; i < 3; i++)
403	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
404	greg	1.1	} else {
405			nv.horiz = ourview.horiz;
406			nv.vert = ourview.vert;
407	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
408	greg	1.1	}
409	greg	1.2	for (i = 0; i < 3; i++)
410			nv.vp[i] = vc[i] - d*nv.vdir[i];
411	greg	1.1	newview(&nv);
412	greg	1.17	}
413
414
415			zoomview(vp, zf) /* zoom in our out */
416			register VIEW *vp;
417			double zf;
418			{
419			switch (vp->type) {
420			case VT_PAR: /* parallel view */
421			case VT_ANG: /* angular fisheye */
422			vp->horiz /= zf;
423			vp->vert /= zf;
424			return;
425			case VT_PER: /* perspective view */
426			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
427			(PI/180./2.);
428			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
429			(PI/180./2.);
430			return;
431			case VT_HEM: /* hemispherical fisheye */
432			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
433			if (vp->horiz >= 1.0-FTINY)
434			vp->horiz = 180.;
435			else
436			vp->horiz = asin(vp->horiz) / (PI/180./2.);
437			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
438			if (vp->vert >= 1.0-FTINY)
439			vp->vert = 180.;
440			else
441			vp->vert = asin(vp->vert) / (PI/180./2.);
442			return;
443			}
444	greg	1.1	}