src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id: rv3.c,v 2.19 2005/09/19 02:23:58 greg Exp $";
#endif
/*
 *  rv3.c - miscellaneous routines for rview.
 *
 *  External symbols declared in rpaint.h
 */

#include "copyright.h"

#include <string.h>

#include  "ray.h"
#include  "rpaint.h"
#include  "random.h"

#ifndef WFLUSH
#define WFLUSH          2048            /* 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


int
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);
}


int
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 ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
                        &ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
                        error(COMMAND, "not on image");
                        return(-1);
                }
                if (!direc || ourview.type == VT_PAR) {
                        rayorigin(&thisray, PRIMARY, NULL, NULL);
                        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];
                if (normalize(vec) == 0.0) {
                        error(COMMAND, "point at view origin");
                        return(-1);
                }
        }
        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);
}


void
paint(p, xmin, ymin, xmax, ymax)        /* compute and paint a rectangle */
register PNODE  *p;
int  xmin, ymin, xmax, ymax;
{
        static unsigned 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 ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
                        h/hresolu, v/vresolu)) < -FTINY) {
                setcolor(thisray.rcol, 0.0, 0.0, 0.0);
        } else {
                rayorigin(&thisray, PRIMARY, NULL, NULL);
                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)();
        }
}


void
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);
}


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


void
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);
}


void
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);
}


void
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);
}


void
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);
        }
}


void
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((void *)p->kid);
        p->kid = NULL;
}


void
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 (memcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) {
                oldview = ourview;
                ourview = *vp;
                newimage();
        }
}


void
moveview(angle, elev, mag, vc)                  /* move viewpoint */
double  angle, elev, mag;
FVECT  vc;
{
        double  d;
        FVECT  v1;
        VIEW  nv = ourview;
        register int  i;

        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 == VT_PAR) {
                nv.horiz /= mag;
                nv.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 {
                d = sqrt(dist2(ourview.vp, vc)) / mag;
                if (nv.vfore > FTINY) {
                        nv.vfore += d - d*mag;
                        if (nv.vfore < 0.0) nv.vfore = 0.0;
                }
                if (nv.vaft > FTINY) {
                        nv.vaft += d - d*mag;
                        if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
                }
                nv.vdist /= mag;
        }
        for (i = 0; i < 3; i++)
                nv.vp[i] = vc[i] - d*nv.vdir[i];
        newview(&nv);
}


void
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;
}


void
zoomview(vp, zf)                        /* zoom in or out */
register VIEW  *vp;
double  zf;
{
        switch (vp->type) {
        case VT_PAR:                            /* parallel view */
                vp->horiz /= zf;
                vp->vert /= zf;
                return;
        case VT_ANG:                            /* angular fisheye */
                vp->horiz /= zf;
                if (vp->horiz > 360.)
                        vp->horiz = 360.;
                vp->vert /= zf;
                if (vp->vert > 360.)
                        vp->vert = 360.;
                return;
        case VT_CYL:                            /* cylindrical panorama */
                vp->horiz /= zf;
                if (vp->horiz > 360.)
                        vp->horiz = 360.;
                vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
                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:	2.20
Committed:	Wed Apr 5 06:22:57 2006 UTC (19 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R8
Changes since 2.19:	+2 -2 lines
Log Message:	Made -u+ option truly random
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.20	static const char RCSid[] = "$Id: rv3.c,v 2.19 2005/09/19 02:23:58 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* rv3.c - miscellaneous routines for rview.
6			*
7	greg	2.10	* External symbols declared in rpaint.h
8			*/
9
10	greg	2.11	#include "copyright.h"
11	greg	1.1
12	schorsch	2.12	#include <string.h>
13
14	greg	1.1	#include "ray.h"
15			#include "rpaint.h"
16			#include "random.h"
17	greg	1.7
18	greg	1.13	#ifndef WFLUSH
19	greg	2.19	#define WFLUSH 2048 /* flush after this many rays */
20	greg	1.13	#endif
21	greg	1.7
22	greg	2.2	#ifdef SMLFLT
23			#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
24			#else
25			#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
26			#endif
27	greg	1.13
28	greg	2.2
29	greg	2.10	int
30	greg	1.7	getrect(s, r) /* get a box */
31			char *s;
32			register RECT *r;
33			{
34			int x0, y0, x1, y1;
35
36			if (*s && !strncmp(s, "all", strlen(s))) {
37			r->l = r->d = 0;
38	greg	1.9	r->r = hresolu;
39			r->u = vresolu;
40	greg	1.7	return(0);
41			}
42			if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
43			if (dev->getcur == NULL)
44			return(-1);
45			(*dev->comout)("Pick first corner\n");
46			if ((*dev->getcur)(&x0, &y0) == ABORT)
47			return(-1);
48			(*dev->comout)("Pick second corner\n");
49			if ((*dev->getcur)(&x1, &y1) == ABORT)
50			return(-1);
51			}
52			if (x0 < x1) {
53			r->l = x0;
54			r->r = x1;
55			} else {
56			r->l = x1;
57			r->r = x0;
58			}
59			if (y0 < y1) {
60			r->d = y0;
61			r->u = y1;
62			} else {
63			r->d = y1;
64			r->u = y0;
65			}
66			if (r->l < 0) r->l = 0;
67			if (r->d < 0) r->d = 0;
68	greg	1.9	if (r->r > hresolu) r->r = hresolu;
69			if (r->u > vresolu) r->u = vresolu;
70	greg	1.7	if (r->l > r->r) r->l = r->r;
71			if (r->d > r->u) r->d = r->u;
72			return(0);
73			}
74
75
76	greg	2.10	int
77	greg	1.7	getinterest(s, direc, vec, mp) /* get area of interest */
78			char *s;
79			int direc;
80			FVECT vec;
81			double *mp;
82			{
83			int x, y;
84			RAY thisray;
85			register int i;
86
87			if (sscanf(s, "%lf", mp) != 1)
88			*mp = 1.0;
89			else if (mp < -FTINY) / negative zoom is reduction */
90			mp = -1.0 / mp;
91			else if (mp <= FTINY) { / too small */
92			error(COMMAND, "illegal magnification");
93			return(-1);
94			}
95	greg	2.2	if (!sscanvec(sskip(s), vec)) {
96	greg	1.7	if (dev->getcur == NULL)
97			return(-1);
98			(*dev->comout)("Pick view center\n");
99			if ((*dev->getcur)(&x, &y) == ABORT)
100			return(-1);
101	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
102			&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
103	greg	1.17	error(COMMAND, "not on image");
104			return(-1);
105			}
106	greg	1.7	if (!direc \|\| ourview.type == VT_PAR) {
107	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
108	greg	1.7	if (!localhit(&thisray, &thescene)) {
109			error(COMMAND, "not a local object");
110			return(-1);
111			}
112			}
113			if (direc)
114			if (ourview.type == VT_PAR)
115			for (i = 0; i < 3; i++)
116			vec[i] = thisray.rop[i] - ourview.vp[i];
117			else
118			VCOPY(vec, thisray.rdir);
119			else
120			VCOPY(vec, thisray.rop);
121	greg	2.15	} else if (direc) {
122			for (i = 0; i < 3; i++)
123			vec[i] -= ourview.vp[i];
124			if (normalize(vec) == 0.0) {
125			error(COMMAND, "point at view origin");
126			return(-1);
127			}
128			}
129	greg	1.7	return(0);
130			}
131	greg	1.1
132
133			float * /* keep consistent with COLOR typedef */
134			greyof(col) /* convert color to greyscale */
135			register COLOR col;
136			{
137			static COLOR gcol;
138			double b;
139
140			b = bright(col);
141			setcolor(gcol, b, b, b);
142			return(gcol);
143			}
144
145
146	greg	2.10	void
147	greg	1.1	paint(p, xmin, ymin, xmax, ymax) /* compute and paint a rectangle */
148			register PNODE *p;
149			int xmin, ymin, xmax, ymax;
150			{
151	greg	2.5	static unsigned long lastflush = 0;
152	greg	1.1	static RAY thisray;
153			double h, v;
154
155			if (xmax - xmin <= 0 \|\| ymax - ymin <= 0) { /* empty */
156			p->x = xmin;
157			p->y = ymin;
158			setcolor(p->v, 0.0, 0.0, 0.0);
159			return;
160			}
161			/* jitter ray direction */
162	greg	1.15	h = xmin + (xmax-xmin)*frandom();
163			v = ymin + (ymax-ymin)*frandom();
164	greg	1.1
165	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
166			h/hresolu, v/vresolu)) < -FTINY) {
167	greg	1.17	setcolor(thisray.rcol, 0.0, 0.0, 0.0);
168			} else {
169	greg	2.17	rayorigin(&thisray, PRIMARY, NULL, NULL);
170	greg	2.20	samplendx++;
171	greg	1.17	rayvalue(&thisray);
172			}
173	greg	1.1
174	greg	1.15	p->x = h;
175			p->y = v;
176	greg	1.1	copycolor(p->v, thisray.rcol);
177			scalecolor(p->v, exposure);
178
179			(*dev->paintr)(greyscale?greyof(p->v):p->v, xmin, ymin, xmax, ymax);
180	greg	1.13
181			if (dev->flush != NULL && nrays - lastflush >= WFLUSH) {
182			lastflush = nrays;
183			(*dev->flush)();
184			}
185	greg	1.1	}
186
187
188	greg	2.10	void
189	greg	1.1	newimage() /* start a new image */
190			{
191			/* free old image */
192			freepkids(&ptrunk);
193	greg	1.19	/* save reserve memory */
194			fillreserves();
195	greg	1.9	/* compute resolution */
196	greg	1.10	hresolu = dev->xsiz;
197			vresolu = dev->ysiz;
198	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
199	greg	1.1	pframe.l = pframe.d = 0;
200	greg	1.9	pframe.r = hresolu; pframe.u = vresolu;
201	greg	1.1	pdepth = 0;
202			/* clear device */
203	greg	1.9	(*dev->clear)(hresolu, vresolu);
204	greg	1.1	/* get first value */
205	greg	1.9	paint(&ptrunk, 0, 0, hresolu, vresolu);
206	greg	1.1	}
207
208
209	greg	2.10	void
210	greg	1.1	redraw() /* redraw the image */
211			{
212	greg	1.9	(*dev->clear)(hresolu, vresolu);
213	greg	1.1	(*dev->comout)("redrawing...\n");
214	greg	1.9	repaint(0, 0, hresolu, vresolu);
215	greg	1.1	(*dev->comout)("\n");
216			}
217
218
219	greg	2.10	void
220	greg	1.1	repaint(xmin, ymin, xmax, ymax) /* repaint a region */
221			int xmin, ymin, xmax, ymax;
222			{
223			RECT reg;
224
225			reg.l = xmin; reg.r = xmax;
226			reg.d = ymin; reg.u = ymax;
227
228	greg	1.9	paintrect(&ptrunk, 0, 0, hresolu, vresolu, &reg);
229	greg	1.1	}
230
231
232	greg	2.10	void
233	greg	1.1	paintrect(p, xmin, ymin, xmax, ymax, r) /* paint picture rectangle */
234			register PNODE *p;
235			int xmin, ymin, xmax, ymax;
236			register RECT *r;
237			{
238			int mx, my;
239
240			if (xmax - xmin <= 0 \|\| ymax - ymin <= 0)
241			return;
242
243			if (p->kid == NULL) {
244			(*dev->paintr)(greyscale?greyof(p->v):p->v,
245			xmin, ymin, xmax, ymax); /* do this */
246			return;
247			}
248			mx = (xmin + xmax) >> 1; /* do kids */
249			my = (ymin + ymax) >> 1;
250			if (mx > r->l) {
251			if (my > r->d)
252			paintrect(p->kid+DL, xmin, ymin, mx, my, r);
253			if (my < r->u)
254			paintrect(p->kid+UL, xmin, my, mx, ymax, r);
255			}
256			if (mx < r->r) {
257			if (my > r->d)
258			paintrect(p->kid+DR, mx, ymin, xmax, my, r);
259			if (my < r->u)
260			paintrect(p->kid+UR, mx, my, xmax, ymax, r);
261			}
262			}
263
264
265			PNODE *
266			findrect(x, y, p, r, pd) /* find a rectangle */
267			int x, y;
268			register PNODE *p;
269			register RECT *r;
270			int pd;
271			{
272			int mx, my;
273
274			while (p->kid != NULL && pd--) {
275
276			mx = (r->l + r->r) >> 1;
277			my = (r->d + r->u) >> 1;
278
279			if (x < mx) {
280			r->r = mx;
281			if (y < my) {
282			r->u = my;
283			p = p->kid+DL;
284			} else {
285			r->d = my;
286			p = p->kid+UL;
287			}
288			} else {
289			r->l = mx;
290			if (y < my) {
291			r->u = my;
292			p = p->kid+DR;
293			} else {
294			r->d = my;
295			p = p->kid+UR;
296			}
297			}
298			}
299			return(p);
300			}
301
302
303	greg	2.10	void
304	greg	1.1	scalepict(p, sf) /* scale picture values */
305			register PNODE *p;
306			double sf;
307			{
308			scalecolor(p->v, sf); /* do this node */
309
310			if (p->kid == NULL)
311			return;
312			/* do children */
313			scalepict(p->kid+DL, sf);
314			scalepict(p->kid+DR, sf);
315			scalepict(p->kid+UL, sf);
316			scalepict(p->kid+UR, sf);
317			}
318
319
320	greg	2.10	void
321	greg	1.1	getpictcolrs(yoff, scan, p, xsiz, ysiz) /* get scanline from picture */
322			int yoff;
323			register COLR *scan;
324			register PNODE *p;
325			int xsiz, ysiz;
326			{
327			register int mx;
328			int my;
329
330			if (p->kid == NULL) { /* do this node */
331			setcolr(scan[0], colval(p->v,RED),
332			colval(p->v,GRN),
333			colval(p->v,BLU));
334			for (mx = 1; mx < xsiz; mx++)
335			copycolr(scan[mx], scan[0]);
336			return;
337			}
338			/* do kids */
339			mx = xsiz >> 1;
340			my = ysiz >> 1;
341			if (yoff < my) {
342			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
343			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
344			} else {
345			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
346			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
347			}
348			}
349
350
351	greg	2.10	void
352	greg	1.1	freepkids(p) /* free pnode's children */
353			register PNODE *p;
354			{
355			if (p->kid == NULL)
356			return;
357			freepkids(p->kid+DL);
358			freepkids(p->kid+DR);
359			freepkids(p->kid+UL);
360			freepkids(p->kid+UR);
361	greg	2.10	free((void *)p->kid);
362	greg	1.1	p->kid = NULL;
363			}
364
365
366	greg	2.10	void
367	greg	1.1	newview(vp) /* change viewing parameters */
368			register VIEW *vp;
369			{
370			char *err;
371
372	greg	1.6	if ((err = setview(vp)) != NULL) {
373	greg	1.1	sprintf(errmsg, "view not set - %s", err);
374			error(COMMAND, errmsg);
375	schorsch	2.12	} else if (memcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
376	schorsch	2.13	oldview = ourview;
377			ourview = *vp;
378	greg	1.14	newimage();
379	greg	1.1	}
380			}
381
382
383	greg	2.10	void
384	greg	1.4	moveview(angle, elev, mag, vc) /* move viewpoint */
385			double angle, elev, mag;
386	greg	1.1	FVECT vc;
387			{
388			double d;
389	greg	1.4	FVECT v1;
390	greg	2.14	VIEW nv = ourview;
391	greg	1.1	register int i;
392
393			spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
394	greg	1.4	if (elev != 0.0) {
395	greg	1.5	fcross(v1, ourview.vup, nv.vdir);
396	greg	1.4	normalize(v1);
397			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
398			}
399	greg	2.15	if (nv.type == VT_PAR) {
400			nv.horiz /= mag;
401			nv.vert /= mag;
402	greg	1.3	d = 0.0; /* don't move closer */
403	greg	1.2	for (i = 0; i < 3; i++)
404	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
405	greg	1.1	} else {
406	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
407	greg	2.15	if (nv.vfore > FTINY) {
408	greg	2.8	nv.vfore += d - d*mag;
409			if (nv.vfore < 0.0) nv.vfore = 0.0;
410			}
411	greg	2.15	if (nv.vaft > FTINY) {
412	greg	2.8	nv.vaft += d - d*mag;
413			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
414			}
415	greg	2.16	nv.vdist /= mag;
416	greg	1.1	}
417	greg	1.2	for (i = 0; i < 3; i++)
418			nv.vp[i] = vc[i] - d*nv.vdir[i];
419	greg	1.1	newview(&nv);
420	greg	1.17	}
421
422
423	greg	2.10	void
424			pcopy(p1, p2) /* copy paint node p1 into p2 */
425			register PNODE p1, p2;
426			{
427			copycolor(p2->v, p1->v);
428			p2->x = p1->x;
429			p2->y = p1->y;
430			}
431
432
433			void
434	greg	2.9	zoomview(vp, zf) /* zoom in or out */
435	greg	1.17	register VIEW *vp;
436			double zf;
437			{
438			switch (vp->type) {
439			case VT_PAR: /* parallel view */
440	greg	2.9	vp->horiz /= zf;
441			vp->vert /= zf;
442			return;
443	greg	1.17	case VT_ANG: /* angular fisheye */
444			vp->horiz /= zf;
445	greg	2.9	if (vp->horiz > 360.)
446			vp->horiz = 360.;
447	greg	1.17	vp->vert /= zf;
448	greg	2.9	if (vp->vert > 360.)
449			vp->vert = 360.;
450			return;
451			case VT_CYL: /* cylindrical panorama */
452			vp->horiz /= zf;
453			if (vp->horiz > 360.)
454			vp->horiz = 360.;
455			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
456	greg	1.17	return;
457			case VT_PER: /* perspective view */
458			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
459			(PI/180./2.);
460			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
461			(PI/180./2.);
462			return;
463			case VT_HEM: /* hemispherical fisheye */
464			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
465			if (vp->horiz >= 1.0-FTINY)
466			vp->horiz = 180.;
467			else
468			vp->horiz = asin(vp->horiz) / (PI/180./2.);
469			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
470			if (vp->vert >= 1.0-FTINY)
471			vp->vert = 180.;
472			else
473			vp->vert = asin(vp->vert) / (PI/180./2.);
474			return;
475			}
476	greg	1.1	}