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greg |
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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: pick point 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 = 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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} |
