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- /* Copyright (c) 1987 Regents of the University of California */
-
- #ifndef lint
- static char SCCSid[] = "@(#)rv3.c 2.3 10/2/92 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, ®);
- }
-
-
- 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;
- {
- 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;
- }
- }
-