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/* Copyright (c) 1987 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* rv3.c - miscellaneous routines for rview. |
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* |
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* 5/11/87 |
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*/ |
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|
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#include "ray.h" |
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|
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#include "rpaint.h" |
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|
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#include "random.h" |
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|
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|
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float * /* keep consistent with COLOR typedef */ |
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greyof(col) /* convert color to greyscale */ |
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register COLOR col; |
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{ |
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static COLOR gcol; |
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double b; |
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|
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b = bright(col); |
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setcolor(gcol, b, b, b); |
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return(gcol); |
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} |
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|
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|
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paint(p, xmin, ymin, xmax, ymax) /* compute and paint a rectangle */ |
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register PNODE *p; |
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int xmin, ymin, xmax, ymax; |
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{ |
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static RAY thisray; |
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double h, v; |
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register int i; |
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|
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if (xmax - xmin <= 0 || ymax - ymin <= 0) { /* empty */ |
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p->x = xmin; |
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p->y = ymin; |
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setcolor(p->v, 0.0, 0.0, 0.0); |
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return; |
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} |
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/* jitter ray direction */ |
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p->x = h = xmin + (xmax-xmin)*frandom(); |
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p->y = v = ymin + (ymax-ymin)*frandom(); |
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|
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rayview(thisray.rorg, thisray.rdir, &ourview, h, v); |
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|
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rayorigin(&thisray, NULL, PRIMARY, 1.0); |
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|
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rayvalue(&thisray); |
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|
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copycolor(p->v, thisray.rcol); |
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|
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scalecolor(p->v, exposure); |
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|
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(*dev->paintr)(greyscale?greyof(p->v):p->v, xmin, ymin, xmax, ymax); |
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} |
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|
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|
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newimage() /* start a new image */ |
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{ |
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/* free old image */ |
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freepkids(&ptrunk); |
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/* set up frame */ |
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if (ourview.hresolu > dev->xsiz || ourview.vresolu > dev->ysiz) |
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error(USER, "resolution mismatch"); |
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pframe.l = pframe.d = 0; |
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pframe.r = ourview.hresolu; pframe.u = ourview.vresolu; |
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pdepth = 0; |
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/* clear device */ |
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(*dev->clear)(ourview.hresolu, ourview.vresolu); |
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/* get first value */ |
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paint(&ptrunk, 0, 0, ourview.hresolu, ourview.vresolu); |
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} |
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|
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|
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redraw() /* redraw the image */ |
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{ |
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(*dev->clear)(ourview.hresolu, ourview.vresolu); |
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(*dev->comout)("redrawing...\n"); |
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repaint(0, 0, ourview.hresolu, ourview.vresolu); |
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(*dev->comout)("\n"); |
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} |
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|
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|
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repaint(xmin, ymin, xmax, ymax) /* repaint a region */ |
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int xmin, ymin, xmax, ymax; |
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{ |
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RECT reg; |
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|
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reg.l = xmin; reg.r = xmax; |
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reg.d = ymin; reg.u = ymax; |
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|
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paintrect(&ptrunk, 0, 0, ourview.hresolu, ourview.vresolu, ®); |
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} |
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|
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|
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paintrect(p, xmin, ymin, xmax, ymax, r) /* paint picture rectangle */ |
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register PNODE *p; |
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int xmin, ymin, xmax, ymax; |
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register RECT *r; |
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{ |
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int mx, my; |
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|
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if (dev->inpready) |
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return; /* break for input */ |
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|
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if (xmax - xmin <= 0 || ymax - ymin <= 0) |
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return; |
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|
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if (p->kid == NULL) { |
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(*dev->paintr)(greyscale?greyof(p->v):p->v, |
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xmin, ymin, xmax, ymax); /* do this */ |
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return; |
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} |
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mx = (xmin + xmax) >> 1; /* do kids */ |
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my = (ymin + ymax) >> 1; |
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if (mx > r->l) { |
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if (my > r->d) |
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paintrect(p->kid+DL, xmin, ymin, mx, my, r); |
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if (my < r->u) |
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paintrect(p->kid+UL, xmin, my, mx, ymax, r); |
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} |
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if (mx < r->r) { |
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if (my > r->d) |
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paintrect(p->kid+DR, mx, ymin, xmax, my, r); |
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if (my < r->u) |
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paintrect(p->kid+UR, mx, my, xmax, ymax, r); |
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} |
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} |
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|
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|
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PNODE * |
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findrect(x, y, p, r, pd) /* find a rectangle */ |
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int x, y; |
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register PNODE *p; |
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register RECT *r; |
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int pd; |
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{ |
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int mx, my; |
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|
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while (p->kid != NULL && pd--) { |
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|
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mx = (r->l + r->r) >> 1; |
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my = (r->d + r->u) >> 1; |
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|
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if (x < mx) { |
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r->r = mx; |
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if (y < my) { |
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r->u = my; |
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p = p->kid+DL; |
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} else { |
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r->d = my; |
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p = p->kid+UL; |
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} |
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} else { |
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r->l = mx; |
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if (y < my) { |
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r->u = my; |
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p = p->kid+DR; |
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} else { |
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r->d = my; |
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p = p->kid+UR; |
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} |
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} |
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} |
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return(p); |
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} |
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|
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|
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scalepict(p, sf) /* scale picture values */ |
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register PNODE *p; |
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double sf; |
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{ |
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scalecolor(p->v, sf); /* do this node */ |
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|
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if (p->kid == NULL) |
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return; |
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/* do children */ |
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scalepict(p->kid+DL, sf); |
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scalepict(p->kid+DR, sf); |
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scalepict(p->kid+UL, sf); |
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scalepict(p->kid+UR, sf); |
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} |
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|
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|
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getpictcolrs(yoff, scan, p, xsiz, ysiz) /* get scanline from picture */ |
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int yoff; |
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register COLR *scan; |
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register PNODE *p; |
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int xsiz, ysiz; |
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{ |
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register int mx; |
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int my; |
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|
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if (p->kid == NULL) { /* do this node */ |
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setcolr(scan[0], colval(p->v,RED), |
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colval(p->v,GRN), |
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colval(p->v,BLU)); |
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for (mx = 1; mx < xsiz; mx++) |
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copycolr(scan[mx], scan[0]); |
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return; |
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} |
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/* do kids */ |
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mx = xsiz >> 1; |
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my = ysiz >> 1; |
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if (yoff < my) { |
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getpictcolrs(yoff, scan, p->kid+DL, mx, my); |
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getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my); |
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} else { |
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getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my); |
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getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my); |
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} |
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} |
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|
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|
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pcopy(p1, p2) /* copy paint node p1 into p2 */ |
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register PNODE *p1, *p2; |
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{ |
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copycolor(p2->v, p1->v); |
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p2->x = p1->x; |
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p2->y = p1->y; |
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} |
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|
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|
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freepkids(p) /* free pnode's children */ |
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register PNODE *p; |
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{ |
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if (p->kid == NULL) |
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return; |
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freepkids(p->kid+DL); |
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freepkids(p->kid+DR); |
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freepkids(p->kid+UL); |
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freepkids(p->kid+UR); |
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free((char *)p->kid); |
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p->kid = NULL; |
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} |
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|
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|
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newview(vp) /* change viewing parameters */ |
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register VIEW *vp; |
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{ |
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char *err; |
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|
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if (vp->hresolu > dev->xsiz || vp->vresolu > dev->ysiz) { |
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error(COMMAND, "view not set - resolution mismatch"); |
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} else if ((err = setview(vp)) != NULL) { |
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sprintf(errmsg, "view not set - %s", err); |
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error(COMMAND, errmsg); |
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} else if (bcmp(vp, &ourview, sizeof(VIEW))) { |
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bcopy(&ourview, &oldview, sizeof(VIEW)); |
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bcopy(vp, &ourview, sizeof(VIEW)); |
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newimage(); |
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} |
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} |
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|
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|
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moveview(angle, mag, vc) /* move viewpoint */ |
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double angle, mag; |
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FVECT vc; |
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{ |
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extern double sqrt(), dist2(); |
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double d; |
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VIEW nv; |
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register int i; |
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|
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VCOPY(nv.vup, ourview.vup); |
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nv.hresolu = ourview.hresolu; nv.vresolu = ourview.vresolu; |
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spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.)); |
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d = sqrt(dist2(ourview.vp, vc)) / mag; |
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for (i = 0; i < 3; i++) |
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nv.vp[i] = vc[i] - d*nv.vdir[i]; |
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if ((nv.type = ourview.type) == VT_PAR) { |
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nv.horiz = ourview.horiz / mag; |
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nv.vert = ourview.vert / mag; |
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} else { |
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nv.horiz = ourview.horiz; |
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nv.vert = ourview.vert; |
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} |
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newview(&nv); |
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} |
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|
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|
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spinvector(vres, vorig, vnorm, theta) /* rotate vector around normal */ |
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FVECT vres, vorig, vnorm; |
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double theta; |
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{ |
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extern double sin(), cos(); |
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double sint, cost, dotp; |
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FVECT vperp; |
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register int i; |
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|
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if (theta == 0.0) { |
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VCOPY(vres, vorig); |
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return; |
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} |
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sint = sin(theta); |
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cost = cos(theta); |
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dotp = DOT(vorig, vnorm); |
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fcross(vperp, vnorm, vorig); |
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for (i = 0; i < 3; i++) |
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vres[i] = vnorm[i]*dotp*(1.-cost) + |
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vorig[i]*cost + vperp[i]*sint; |
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} |
