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greg |
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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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* 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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#include "standard.h"
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#include "view.h"
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#include <X11/Xlib.h>
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#define MAXDEPTH 32 /* ridiculous ray tree depth */
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char rtcom[] = "rtrace -h -otp -fa -x 1";
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char xicom[] = "x11image";
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VIEW ourview = STDVIEW; /* view for picture */
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int xres, yres;
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char *progname; /* program name */
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FILE *pin; /* input stream */
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Display *theDisplay = NULL; /* connection to server */
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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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#define newnode() (struct node *)calloc(1, sizeof(struct node))
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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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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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exit(0);
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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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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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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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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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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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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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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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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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#define rwind RootWindow(theDisplay,ourScreen)
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#define ourScreen DefaultScreen(theDisplay)
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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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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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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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}
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