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#ifndef lint |
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static const char RCSid[] = "$Id: xshowtrace.c,v 2.12 2005/07/30 22:02:29 greg Exp $"; |
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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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|
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#include <X11/Xlib.h> |
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|
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#include "standard.h" |
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#include "paths.h" |
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#include "view.h" |
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|
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#define MAXDEPTH 32 /* ridiculous ray tree depth */ |
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|
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#define sscanvec(s,v) (sscanf(s,FVFORMAT,v,v+1,v+2)==3) |
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|
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char rtcom[64] = "rtrace -h- -otp -fa -x 1"; |
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char xicom[] = "ximage -c 256"; |
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|
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VIEW ourview = STDVIEW; /* view for picture */ |
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RESOLU ourres; /* picture resolution */ |
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|
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char *progname; /* program name */ |
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|
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char *picture; /* picture 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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int 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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int slow = 0; /* slow trace? */ |
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|
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void mainloop(void); |
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static void freetree(struct node *tp); |
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static void tracerays(struct node *tp); |
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static int strtoipt(int ipt[2], char *str); |
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static void setvec(int ipt[2]); |
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static void vector(int ip1[2], int ip2[2]); |
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|
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|
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int |
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main( /* 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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{ |
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int i; |
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char combuf[PATH_MAX]; |
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|
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progname = argv[0]; |
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for (i = 1; i < argc-2; i++) |
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if (!strcmp(argv[i], "-s")) |
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slow++; |
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else if (!strcmp(argv[i], "-T")) |
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strcat(rtcom, " -oTp"); |
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else |
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break; |
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if (i > argc-2) { |
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fprintf(stderr, "Usage: %s [-s][-T] [rtrace args] octree picture\n", |
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progname); |
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exit(1); |
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} |
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picture = argv[argc-1]; |
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/* get the viewing parameters */ |
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if (viewfile(picture, &ourview, &ourres) <= 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, picture); |
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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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/* build input command */ |
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sprintf(combuf, "%s \"%s\" | %s", xicom, picture, rtcom); |
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for ( ; 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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/* close pipe and exit */ |
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pclose(pin); |
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exit(0); |
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} |
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|
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|
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void |
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mainloop(void) /* 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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freetree(sis[0]); |
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sis[0] = NULL; |
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if (!slow) |
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XFlush(theDisplay); |
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} |
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} |
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} |
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|
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|
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static void |
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freetree( /* free a trace tree */ |
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struct node *tp |
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) |
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{ |
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register struct node *kid, *k2; |
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|
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for (kid = tp->daughter; kid != NULL; kid = k2) { |
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k2 = kid->sister; |
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freetree(kid); |
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} |
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free((void *)tp); |
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} |
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|
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|
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static void |
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tracerays( /* trace a ray tree */ |
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struct node *tp |
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) |
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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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vector(tp->ipt, kid->ipt); |
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tracerays(kid); |
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} |
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} |
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|
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|
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static int |
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strtoipt( /* convert string x y z to image point */ |
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int ipt[2], |
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char *str |
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) |
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{ |
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FVECT im_pt, pt; |
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|
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if (!sscanvec(str, pt)) |
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return(-1); |
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if (DOT(pt,pt) <= FTINY) /* origin is really infinity */ |
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ipt[0] = ipt[1] = -1; /* null vector */ |
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else { |
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viewloc(im_pt, &ourview, pt); |
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loc2pix(ipt, &ourres, im_pt[0], im_pt[1]); |
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} |
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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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static void |
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setvec( /* set up vector drawing for pick */ |
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int ipt[2] |
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) |
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{ |
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extern Window xfindwind(); |
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XWindowAttributes wa; |
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XColor xc; |
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XGCValues gcv; |
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int rx, ry, wx, wy; |
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Window rw, cw; |
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unsigned int pm; |
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/* compute pointer location */ |
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if (gwind == 0) { |
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register char *wn; |
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for (wn = picture; *wn; wn++); |
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while (wn > picture && wn[-1] != '/') wn--; |
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if ((gwind = xfindwind(theDisplay, rwind, wn, 4)) == 0) { |
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fprintf(stderr, "%s: cannot find display window!\n", |
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progname); |
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exit(1); |
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} |
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} |
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XQueryPointer(theDisplay, gwind, &rw, &cw, &rx, &ry, &wx, &wy, &pm); |
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xoff = wx - ipt[0]; |
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yoff = wy - ipt[1]; |
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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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static void |
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vector( /* draw a vector */ |
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int ip1[2], |
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int ip2[2] |
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) |
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{ |
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if (ip2[0] == -1 && ip2[1] == -1) |
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return; /* null vector */ |
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XDrawLine(theDisplay, gwind, vecGC, |
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ip1[0]+xoff, ip1[1]+yoff, |
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ip2[0]+xoff, ip2[1]+yoff); |
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if (slow) { |
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XFlush(theDisplay); |
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sleep(1); |
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} |
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} |
