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/* Copyright (c) 1991 Regents of the University of California */
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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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* Circle sources in a displayed image.
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*
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* 18 Mar 1991 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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#include <X11/cursorfont.h>
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#include <X11/Xutil.h>
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#define NSEG 30 /* number of segments per circle */
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VIEW ourview = STDVIEW; /* view for picture */
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int xres, yres; /* picture resolution */
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char *progname; /* program name */
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Display *theDisplay = NULL; /* connection to server */
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#define rwind RootWindow(theDisplay,ourScreen)
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#define ourScreen DefaultScreen(theDisplay)
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GC vecGC;
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Window gwind;
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Cursor pickcursor;
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main(argc, argv)
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int argc;
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char *argv[];
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{
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FILE *fp;
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progname = argv[0];
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if (argc < 2 || argc > 3) {
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fprintf(stderr, "Usage: %s picture [glaresrc]\n",
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progname);
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exit(1);
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}
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init(argv[1]);
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if (argc < 3)
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fp = stdin;
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else if ((fp = fopen(argv[2], "r")) == NULL) {
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fprintf(stderr, "%s: cannot open \"%s\"\n",
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progname, argv[2]);
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exit(1);
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}
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circle_sources(fp);
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exit(0);
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}
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init(name) /* set up vector drawing from pick */
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char *name;
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{
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XWindowAttributes wa;
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XEvent xev;
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XColor xc;
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XGCValues gcv;
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/* get the viewing parameters */
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if (viewfile(name, &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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progname, name);
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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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progname);
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exit(1);
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}
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pickcursor = XCreateFontCursor(theDisplay, XC_target);
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/* find our window */
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while (XGrabPointer(theDisplay, rwind, True, ButtonPressMask,
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GrabModeAsync, GrabModeAsync, None, pickcursor,
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CurrentTime) != GrabSuccess)
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sleep(2);
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printf("%s: click mouse in \"%s\" display window\n", progname, name);
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XNextEvent(theDisplay, &xev);
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XUngrabPointer(theDisplay, CurrentTime);
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if (((XButtonEvent *)&xev)->subwindow == None) {
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fprintf(stderr, "%s: no window selected\n", progname);
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exit(1);
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}
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gwind = ((XButtonEvent *)&xev)->subwindow;
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XRaiseWindow(theDisplay, gwind);
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XGetWindowAttributes(theDisplay, gwind, &wa);
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sleep(4);
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if (wa.width != xres || wa.height != yres) {
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fprintf(stderr,
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"%s: warning -- window seems to be the wrong size!\n",
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progname);
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xres = wa.width;
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yres = wa.height;
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}
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/* set graphics context */
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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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circle_sources(fp) /* circle sources listed in fp */
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FILE *fp;
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{
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char linbuf[256];
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int reading = 0;
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FVECT dir;
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double dom;
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while (fgets(linbuf, sizeof(linbuf), fp) != NULL)
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if (reading) {
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if (!strncmp(linbuf, "END", 3)) {
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XFlush(theDisplay);
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return;
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}
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if (sscanf(linbuf, "%lf %lf %lf %lf",
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&dir[0], &dir[1], &dir[2],
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&dom) != 4)
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break;
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circle(dir, dom);
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} else if (!strcmp(linbuf, "BEGIN glare source\n"))
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reading++;
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fprintf(stderr, "%s: error reading glare sources\n", progname);
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exit(1);
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}
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circle(dir, dom) /* indicate a solid angle on image */
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FVECT dir;
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double dom;
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{
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FVECT start, cur;
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XPoint pt[NSEG+1];
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double px, py, pz;
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register int i;
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fcross(cur, dir, ourview.vup);
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if (normalize(cur) == 0.0)
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goto fail;
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spinvector(start, dir, cur, acos(1.-dom/(2.*PI)));
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for (i = 0; i <= NSEG; i++) {
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spinvector(cur, start, dir, 2.*PI*i/NSEG);
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cur[0] += ourview.vp[0];
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cur[1] += ourview.vp[1];
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cur[2] += ourview.vp[2];
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viewpixel(&px, &py, &pz, &ourview, cur);
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if (pz <= 0.0)
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goto fail;
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pt[i].x = px*xres;
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pt[i].y = yres-1 - (int)(py*yres);
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}
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XDrawLines(theDisplay, gwind, vecGC, pt, NSEG+1, CoordModeOrigin);
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return;
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fail:
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fprintf(stderr, "%s: cannot draw source at (%f,%f,%f)\n",
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progname, dir[0], dir[1], dir[2]);
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}
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