src/rt/rv3.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  rv3.c - miscellaneous routines for rview.
 *
 *  External symbols declared in rpaint.h
 */

#include "copyright.h"

#include  "ray.h"

#include  "rpaint.h"

#include  "random.h"

#ifndef WFLUSH
#ifdef SPEED
#define WFLUSH          (5*SPEED)
#else
#define WFLUSH          100             /* flush after this many rays */
#endif
#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, 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);
}


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, 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)();
        }
}


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 (bcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) {
                copystruct(&oldview, &ourview);
                copystruct(&ourview, vp);
                newimage();
        }
}


void
moveview(angle, elev, mag, vc)                  /* move viewpoint */
double  angle, elev, mag;
FVECT  vc;
{
        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];
                nv.vfore = ourview.vfore;
                nv.vaft = ourview.vaft;
        } else {
                nv.horiz = ourview.horiz;
                nv.vert = ourview.vert;
                d = sqrt(dist2(ourview.vp, vc)) / mag;
                if ((nv.vfore = ourview.vfore) > FTINY) {
                        nv.vfore += d - d*mag;
                        if (nv.vfore < 0.0) nv.vfore = 0.0;
                }
                if ((nv.vaft = ourview.vaft) > FTINY) {
                        nv.vaft += d - d*mag;
                        if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
                }
        }
        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:	2.11
Committed:	Tue Feb 25 02:47:23 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Changes since 2.10:	+1 -56 lines
Log Message:	Replaced inline copyright notice with #include "copyright.h"
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.10	static const char RCSid[] = "$Id$";
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			#include "ray.h"
13
14			#include "rpaint.h"
15
16			#include "random.h"
17	greg	1.7
18	greg	1.13	#ifndef WFLUSH
19	greg	2.4	#ifdef SPEED
20			#define WFLUSH (5*SPEED)
21			#else
22			#define WFLUSH 100 /* flush after this many rays */
23			#endif
24	greg	1.13	#endif
25	greg	1.7
26	greg	2.2	#ifdef SMLFLT
27			#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3)
28			#else
29			#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3)
30			#endif
31	greg	1.13
32	greg	2.2
33	greg	2.10	int
34	greg	1.7	getrect(s, r) /* get a box */
35			char *s;
36			register RECT *r;
37			{
38			int x0, y0, x1, y1;
39
40			if (*s && !strncmp(s, "all", strlen(s))) {
41			r->l = r->d = 0;
42	greg	1.9	r->r = hresolu;
43			r->u = vresolu;
44	greg	1.7	return(0);
45			}
46			if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) {
47			if (dev->getcur == NULL)
48			return(-1);
49			(*dev->comout)("Pick first corner\n");
50			if ((*dev->getcur)(&x0, &y0) == ABORT)
51			return(-1);
52			(*dev->comout)("Pick second corner\n");
53			if ((*dev->getcur)(&x1, &y1) == ABORT)
54			return(-1);
55			}
56			if (x0 < x1) {
57			r->l = x0;
58			r->r = x1;
59			} else {
60			r->l = x1;
61			r->r = x0;
62			}
63			if (y0 < y1) {
64			r->d = y0;
65			r->u = y1;
66			} else {
67			r->d = y1;
68			r->u = y0;
69			}
70			if (r->l < 0) r->l = 0;
71			if (r->d < 0) r->d = 0;
72	greg	1.9	if (r->r > hresolu) r->r = hresolu;
73			if (r->u > vresolu) r->u = vresolu;
74	greg	1.7	if (r->l > r->r) r->l = r->r;
75			if (r->d > r->u) r->d = r->u;
76			return(0);
77			}
78
79
80	greg	2.10	int
81	greg	1.7	getinterest(s, direc, vec, mp) /* get area of interest */
82			char *s;
83			int direc;
84			FVECT vec;
85			double *mp;
86			{
87			int x, y;
88			RAY thisray;
89			register int i;
90
91			if (sscanf(s, "%lf", mp) != 1)
92			*mp = 1.0;
93			else if (mp < -FTINY) / negative zoom is reduction */
94			mp = -1.0 / mp;
95			else if (mp <= FTINY) { / too small */
96			error(COMMAND, "illegal magnification");
97			return(-1);
98			}
99	greg	2.2	if (!sscanvec(sskip(s), vec)) {
100	greg	1.7	if (dev->getcur == NULL)
101			return(-1);
102			(*dev->comout)("Pick view center\n");
103			if ((*dev->getcur)(&x, &y) == ABORT)
104			return(-1);
105	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir,
106			&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) {
107	greg	1.17	error(COMMAND, "not on image");
108			return(-1);
109			}
110	greg	1.7	if (!direc \|\| ourview.type == VT_PAR) {
111			rayorigin(&thisray, NULL, PRIMARY, 1.0);
112			if (!localhit(&thisray, &thescene)) {
113			error(COMMAND, "not a local object");
114			return(-1);
115			}
116			}
117			if (direc)
118			if (ourview.type == VT_PAR)
119			for (i = 0; i < 3; i++)
120			vec[i] = thisray.rop[i] - ourview.vp[i];
121			else
122			VCOPY(vec, thisray.rdir);
123			else
124			VCOPY(vec, thisray.rop);
125			} else if (direc)
126			for (i = 0; i < 3; i++)
127			vec[i] -= ourview.vp[i];
128			return(0);
129			}
130	greg	1.1
131
132			float * /* keep consistent with COLOR typedef */
133			greyof(col) /* convert color to greyscale */
134			register COLOR col;
135			{
136			static COLOR gcol;
137			double b;
138
139			b = bright(col);
140			setcolor(gcol, b, b, b);
141			return(gcol);
142			}
143
144
145	greg	2.10	void
146	greg	1.1	paint(p, xmin, ymin, xmax, ymax) /* compute and paint a rectangle */
147			register PNODE *p;
148			int xmin, ymin, xmax, ymax;
149			{
150	greg	2.5	static unsigned long lastflush = 0;
151	greg	1.1	static RAY thisray;
152			double h, v;
153
154			if (xmax - xmin <= 0 \|\| ymax - ymin <= 0) { /* empty */
155			p->x = xmin;
156			p->y = ymin;
157			setcolor(p->v, 0.0, 0.0, 0.0);
158			return;
159			}
160			/* jitter ray direction */
161	greg	1.15	h = xmin + (xmax-xmin)*frandom();
162			v = ymin + (ymax-ymin)*frandom();
163	greg	1.1
164	greg	2.6	if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview,
165			h/hresolu, v/vresolu)) < -FTINY) {
166	greg	1.17	setcolor(thisray.rcol, 0.0, 0.0, 0.0);
167			} else {
168			rayorigin(&thisray, NULL, PRIMARY, 1.0);
169	greg	1.20	samplendx++;
170	greg	1.17	rayvalue(&thisray);
171			}
172	greg	1.1
173	greg	1.15	p->x = h;
174			p->y = v;
175	greg	1.1	copycolor(p->v, thisray.rcol);
176			scalecolor(p->v, exposure);
177
178			(*dev->paintr)(greyscale?greyof(p->v):p->v, xmin, ymin, xmax, ymax);
179	greg	1.13
180			if (dev->flush != NULL && nrays - lastflush >= WFLUSH) {
181			lastflush = nrays;
182			(*dev->flush)();
183			}
184	greg	1.1	}
185
186
187	greg	2.10	void
188	greg	1.1	newimage() /* start a new image */
189			{
190			/* free old image */
191			freepkids(&ptrunk);
192	greg	1.19	/* save reserve memory */
193			fillreserves();
194	greg	1.9	/* compute resolution */
195	greg	1.10	hresolu = dev->xsiz;
196			vresolu = dev->ysiz;
197	greg	1.11	normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
198	greg	1.1	pframe.l = pframe.d = 0;
199	greg	1.9	pframe.r = hresolu; pframe.u = vresolu;
200	greg	1.1	pdepth = 0;
201			/* clear device */
202	greg	1.9	(*dev->clear)(hresolu, vresolu);
203	greg	1.1	/* get first value */
204	greg	1.9	paint(&ptrunk, 0, 0, hresolu, vresolu);
205	greg	1.1	}
206
207
208	greg	2.10	void
209	greg	1.1	redraw() /* redraw the image */
210			{
211	greg	1.9	(*dev->clear)(hresolu, vresolu);
212	greg	1.1	(*dev->comout)("redrawing...\n");
213	greg	1.9	repaint(0, 0, hresolu, vresolu);
214	greg	1.1	(*dev->comout)("\n");
215			}
216
217
218	greg	2.10	void
219	greg	1.1	repaint(xmin, ymin, xmax, ymax) /* repaint a region */
220			int xmin, ymin, xmax, ymax;
221			{
222			RECT reg;
223
224			reg.l = xmin; reg.r = xmax;
225			reg.d = ymin; reg.u = ymax;
226
227	greg	1.9	paintrect(&ptrunk, 0, 0, hresolu, vresolu, &reg);
228	greg	1.1	}
229
230
231	greg	2.10	void
232	greg	1.1	paintrect(p, xmin, ymin, xmax, ymax, r) /* paint picture rectangle */
233			register PNODE *p;
234			int xmin, ymin, xmax, ymax;
235			register RECT *r;
236			{
237			int mx, my;
238
239			if (xmax - xmin <= 0 \|\| ymax - ymin <= 0)
240			return;
241
242			if (p->kid == NULL) {
243			(*dev->paintr)(greyscale?greyof(p->v):p->v,
244			xmin, ymin, xmax, ymax); /* do this */
245			return;
246			}
247			mx = (xmin + xmax) >> 1; /* do kids */
248			my = (ymin + ymax) >> 1;
249			if (mx > r->l) {
250			if (my > r->d)
251			paintrect(p->kid+DL, xmin, ymin, mx, my, r);
252			if (my < r->u)
253			paintrect(p->kid+UL, xmin, my, mx, ymax, r);
254			}
255			if (mx < r->r) {
256			if (my > r->d)
257			paintrect(p->kid+DR, mx, ymin, xmax, my, r);
258			if (my < r->u)
259			paintrect(p->kid+UR, mx, my, xmax, ymax, r);
260			}
261			}
262
263
264			PNODE *
265			findrect(x, y, p, r, pd) /* find a rectangle */
266			int x, y;
267			register PNODE *p;
268			register RECT *r;
269			int pd;
270			{
271			int mx, my;
272
273			while (p->kid != NULL && pd--) {
274
275			mx = (r->l + r->r) >> 1;
276			my = (r->d + r->u) >> 1;
277
278			if (x < mx) {
279			r->r = mx;
280			if (y < my) {
281			r->u = my;
282			p = p->kid+DL;
283			} else {
284			r->d = my;
285			p = p->kid+UL;
286			}
287			} else {
288			r->l = mx;
289			if (y < my) {
290			r->u = my;
291			p = p->kid+DR;
292			} else {
293			r->d = my;
294			p = p->kid+UR;
295			}
296			}
297			}
298			return(p);
299			}
300
301
302	greg	2.10	void
303	greg	1.1	scalepict(p, sf) /* scale picture values */
304			register PNODE *p;
305			double sf;
306			{
307			scalecolor(p->v, sf); /* do this node */
308
309			if (p->kid == NULL)
310			return;
311			/* do children */
312			scalepict(p->kid+DL, sf);
313			scalepict(p->kid+DR, sf);
314			scalepict(p->kid+UL, sf);
315			scalepict(p->kid+UR, sf);
316			}
317
318
319	greg	2.10	void
320	greg	1.1	getpictcolrs(yoff, scan, p, xsiz, ysiz) /* get scanline from picture */
321			int yoff;
322			register COLR *scan;
323			register PNODE *p;
324			int xsiz, ysiz;
325			{
326			register int mx;
327			int my;
328
329			if (p->kid == NULL) { /* do this node */
330			setcolr(scan[0], colval(p->v,RED),
331			colval(p->v,GRN),
332			colval(p->v,BLU));
333			for (mx = 1; mx < xsiz; mx++)
334			copycolr(scan[mx], scan[0]);
335			return;
336			}
337			/* do kids */
338			mx = xsiz >> 1;
339			my = ysiz >> 1;
340			if (yoff < my) {
341			getpictcolrs(yoff, scan, p->kid+DL, mx, my);
342			getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my);
343			} else {
344			getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my);
345			getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my);
346			}
347			}
348
349
350	greg	2.10	void
351	greg	1.1	freepkids(p) /* free pnode's children */
352			register PNODE *p;
353			{
354			if (p->kid == NULL)
355			return;
356			freepkids(p->kid+DL);
357			freepkids(p->kid+DR);
358			freepkids(p->kid+UL);
359			freepkids(p->kid+UR);
360	greg	2.10	free((void *)p->kid);
361	greg	1.1	p->kid = NULL;
362			}
363
364
365	greg	2.10	void
366	greg	1.1	newview(vp) /* change viewing parameters */
367			register VIEW *vp;
368			{
369			char *err;
370
371	greg	1.6	if ((err = setview(vp)) != NULL) {
372	greg	1.1	sprintf(errmsg, "view not set - %s", err);
373			error(COMMAND, errmsg);
374	greg	1.12	} else if (bcmp((char )vp, (char )&ourview, sizeof(VIEW))) {
375			copystruct(&oldview, &ourview);
376			copystruct(&ourview, vp);
377	greg	1.14	newimage();
378	greg	1.1	}
379			}
380
381
382	greg	2.10	void
383	greg	1.4	moveview(angle, elev, mag, vc) /* move viewpoint */
384			double angle, elev, mag;
385	greg	1.1	FVECT vc;
386			{
387			double d;
388	greg	1.4	FVECT v1;
389	greg	1.1	VIEW nv;
390			register int i;
391
392			VCOPY(nv.vup, ourview.vup);
393	greg	1.9	nv.hoff = ourview.hoff; nv.voff = ourview.voff;
394	greg	1.1	spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.));
395	greg	1.4	if (elev != 0.0) {
396	greg	1.5	fcross(v1, ourview.vup, nv.vdir);
397	greg	1.4	normalize(v1);
398			spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.));
399			}
400	greg	1.1	if ((nv.type = ourview.type) == VT_PAR) {
401			nv.horiz = ourview.horiz / mag;
402			nv.vert = ourview.vert / mag;
403	greg	1.3	d = 0.0; /* don't move closer */
404	greg	1.2	for (i = 0; i < 3; i++)
405	greg	1.3	d += (vc[i] - ourview.vp[i])*ourview.vdir[i];
406	greg	2.7	nv.vfore = ourview.vfore;
407			nv.vaft = ourview.vaft;
408	greg	1.1	} else {
409			nv.horiz = ourview.horiz;
410			nv.vert = ourview.vert;
411	greg	1.2	d = sqrt(dist2(ourview.vp, vc)) / mag;
412	greg	2.8	if ((nv.vfore = ourview.vfore) > FTINY) {
413			nv.vfore += d - d*mag;
414			if (nv.vfore < 0.0) nv.vfore = 0.0;
415			}
416			if ((nv.vaft = ourview.vaft) > FTINY) {
417			nv.vaft += d - d*mag;
418			if (nv.vaft <= nv.vfore) nv.vaft = 0.0;
419			}
420	greg	1.1	}
421	greg	1.2	for (i = 0; i < 3; i++)
422			nv.vp[i] = vc[i] - d*nv.vdir[i];
423	greg	1.1	newview(&nv);
424	greg	1.17	}
425
426
427	greg	2.10	void
428			pcopy(p1, p2) /* copy paint node p1 into p2 */
429			register PNODE p1, p2;
430			{
431			copycolor(p2->v, p1->v);
432			p2->x = p1->x;
433			p2->y = p1->y;
434			}
435
436
437			void
438	greg	2.9	zoomview(vp, zf) /* zoom in or out */
439	greg	1.17	register VIEW *vp;
440			double zf;
441			{
442			switch (vp->type) {
443			case VT_PAR: /* parallel view */
444	greg	2.9	vp->horiz /= zf;
445			vp->vert /= zf;
446			return;
447	greg	1.17	case VT_ANG: /* angular fisheye */
448			vp->horiz /= zf;
449	greg	2.9	if (vp->horiz > 360.)
450			vp->horiz = 360.;
451	greg	1.17	vp->vert /= zf;
452	greg	2.9	if (vp->vert > 360.)
453			vp->vert = 360.;
454			return;
455			case VT_CYL: /* cylindrical panorama */
456			vp->horiz /= zf;
457			if (vp->horiz > 360.)
458			vp->horiz = 360.;
459			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.);
460	greg	1.17	return;
461			case VT_PER: /* perspective view */
462			vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) /
463			(PI/180./2.);
464			vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) /
465			(PI/180./2.);
466			return;
467			case VT_HEM: /* hemispherical fisheye */
468			vp->horiz = sin(vp->horiz*(PI/180./2.))/zf;
469			if (vp->horiz >= 1.0-FTINY)
470			vp->horiz = 180.;
471			else
472			vp->horiz = asin(vp->horiz) / (PI/180./2.);
473			vp->vert = sin(vp->vert*(PI/180./2.))/zf;
474			if (vp->vert >= 1.0-FTINY)
475			vp->vert = 180.;
476			else
477			vp->vert = asin(vp->vert) / (PI/180./2.);
478			return;
479			}
480	greg	1.1	}