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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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* Display an image and watch the rays get traced. |
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* |
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* 9/21/90 Greg Ward |
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*/ |
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|
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#include "standard.h" |
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#include "view.h" |
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#include <X11/Xlib.h> |
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|
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#define MAXDEPTH 32 /* ridiculous ray tree depth */ |
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|
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char rtcom[] = "rtrace -h -otp -fa -x 1"; |
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char xicom[] = "x11image"; |
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|
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VIEW ourview = STDVIEW; /* view for picture */ |
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int xres, yres; |
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|
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char *progname; /* program name */ |
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|
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FILE *pin; /* input stream */ |
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|
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Display *theDisplay = NULL; /* connection to server */ |
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|
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struct node { /* ray tree node */ |
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double ipt[2]; |
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struct node *sister; |
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struct node *daughter; |
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}; |
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|
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#define newnode() (struct node *)calloc(1, sizeof(struct node)) |
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|
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|
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main(argc, argv) /* takes both the octree and the image */ |
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int argc; |
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char *argv[]; |
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{ |
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int i; |
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char combuf[256]; |
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Cursor curs; |
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|
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progname = argv[0]; |
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if (argc < 3) { |
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fprintf(stderr, "Usage: %s [rtrace args] octree picture\n", |
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argv[0]); |
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exit(1); |
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} |
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/* get the viewing parameters */ |
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if (viewfile(argv[argc-1], &ourview, &xres, &yres) <= 0 || |
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setview(&ourview) != NULL) { |
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fprintf(stderr, "%s: cannot get view from \"%s\"\n", |
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argv[0], argv[argc-1]); |
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exit(1); |
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} |
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/* open the display */ |
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if ((theDisplay = XOpenDisplay(NULL)) == NULL) { |
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fprintf(stderr, |
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"%s: cannot open display; DISPLAY variable set?\n", |
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argv[0]); |
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exit(1); |
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} |
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/* build input command */ |
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sprintf(combuf, "%s %s | %s", xicom, argv[argc-1], rtcom); |
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for (i = 1; i < argc-1; i++) { |
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strcat(combuf, " "); |
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strcat(combuf, argv[i]); |
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} |
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/* start the damn thing */ |
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if ((pin = popen(combuf, "r")) == NULL) |
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exit(1); |
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/* loop on input */ |
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mainloop(); |
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|
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exit(0); |
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} |
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|
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|
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mainloop() /* get and process input */ |
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{ |
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static struct node *sis[MAXDEPTH]; |
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register struct node *newp; |
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char buf[128]; |
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int level; |
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register int i; |
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|
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level = 0; |
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while (fgets(buf, sizeof(buf), pin) != NULL) { |
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if ((newp = newnode()) == NULL) { |
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fprintf(stderr, "%s: memory error\n", progname); |
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return; |
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} |
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for (i = 0; buf[i] == '\t'; i++) |
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; |
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if (strtoipt(newp->ipt, buf+i) < 0) { |
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fprintf(stderr, "%s: bad read\n", progname); |
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return; |
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} |
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newp->sister = sis[i]; |
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sis[i] = newp; |
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if (i < level) { |
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newp->daughter = sis[level]; |
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sis[level] = NULL; |
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} |
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level = i; |
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if (i == 0) { |
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setvec(sis[0]->ipt); |
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tracerays(sis[0]); |
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XFlush(theDisplay); |
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freetree(sis[0]); |
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sis[0] = NULL; |
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} |
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} |
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} |
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|
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|
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freetree(tp) /* free a trace tree */ |
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struct node *tp; |
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{ |
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register struct node *kid; |
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|
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for (kid = tp->daughter; kid != NULL; kid = kid->sister) |
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freetree(kid); |
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free((char *)tp); |
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} |
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|
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|
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tracerays(tp) /* trace a ray tree */ |
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struct node *tp; |
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{ |
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register struct node *kid; |
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|
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for (kid = tp->daughter; kid != NULL; kid = kid->sister) { |
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tracerays(kid); |
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vector(tp->ipt, kid->ipt); |
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} |
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} |
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|
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|
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strtoipt(ipt, str) /* convert string x y z to image point */ |
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double ipt[2]; |
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char *str; |
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{ |
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FVECT pt; |
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|
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if (sscanf(str, "%lf %lf %lf", &pt[0], &pt[1], &pt[2]) != 3) |
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return(-1); |
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viewpixel(&ipt[0], &ipt[1], NULL, &ourview, pt); |
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return(0); |
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} |
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|
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|
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#define rwind RootWindow(theDisplay,ourScreen) |
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#define ourScreen DefaultScreen(theDisplay) |
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|
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GC vecGC = 0; |
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Window gwind = 0; |
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int xoff, yoff; |
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|
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|
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setvec(ipt) /* set up vector drawing for pick */ |
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double ipt[2]; |
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{ |
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XWindowAttributes wa; |
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XColor xc; |
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XGCValues gcv; |
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int pm, rx, ry, wx, wy, rw, cw; |
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/* compute pointer location */ |
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if (gwind == 0) { |
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XQueryPointer(theDisplay, rwind, &rw, &gwind, |
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&rx, &ry, &wx, &wy, &pm); |
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} |
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XQueryPointer(theDisplay, gwind, &rw, &cw, |
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&rx, &ry, &wx, &wy, &pm); |
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xoff = wx - ipt[0]*xres; |
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yoff = wy - (1.-ipt[1])*yres; |
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/* set graphics context */ |
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if (vecGC == 0) { |
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XGetWindowAttributes(theDisplay, gwind, &wa); |
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xc.red = 65535; xc.green = 0; xc.blue = 0; |
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xc.flags = DoRed|DoGreen|DoBlue; |
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if (XAllocColor(theDisplay, wa.colormap, &xc)) { |
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gcv.foreground = xc.pixel; |
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vecGC = XCreateGC(theDisplay,gwind,GCForeground,&gcv); |
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} else { |
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gcv.function = GXinvert; |
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vecGC = XCreateGC(theDisplay,gwind,GCFunction,&gcv); |
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} |
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} |
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} |
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|
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|
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vector(ip1, ip2) /* draw a vector */ |
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double ip1[2], ip2[2]; |
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{ |
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XDrawLine(theDisplay, gwind, vecGC, |
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(int)(ip1[0]*xres)+xoff, (int)((1.-ip1[1])*yres)+yoff, |
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(int)(ip2[0]*xres)+xoff, (int)((1.-ip2[1])*yres)+yoff); |
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} |
