Path: utzoo!mnetor!uunet!husc6!ut-sally!srinivas
From: srinivas@ut-sally.UUCP (Srini Sankaran)
Newsgroups: comp.windows.x
Subject: What's wrong with this code?
Message-ID: <10856@ut-sally.UUCP>
Date: 22 Mar 88 10:42:08 GMT
Organization: U. Texas CS Dept., Austin, Texas
Lines: 70
Keywords: Xtk and Xlib combined.


The following code doesn't work if XTKVIEWPORT is defined.
It works (i.e., draw 10 circles) if it is not defined.

Can someone help me by explaining why?

-thanks
srinivas@sally.utexas.edu
...!ut-sally!srinivas

-----------------------BEGIN CODE-------------------------------------
#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include <X11/Atoms.h>
#include <X11/Viewport.h>

#define XSIZE 512
#define YSIZE 512
static Arg arglist[] =
{
    {XtNwidth, (XtArgVal)XSIZE},
    {XtNheight,(XtArgVal)YSIZE},
} ;

int main(argc, argv)
    unsigned int argc;
    char **argv;
{
    Widget toplevel, viewport;
    Window win;
    Display *dpy;
    GC gc;
    XSetWindowAttributes xswa;
    int i;

    toplevel = XtInitialize("FOO", "FOO", NULL, 0, &argc, argv);
    viewport = XtCreateManagedWidget("viewport", viewportWidgetClass, toplevel,
			  arglist, XtNumber(arglist));
    XtRealizeWidget(toplevel);

    xswa.background_pixel = 0;
    xswa.border_pixel = 1;

    dpy = XtDisplay(viewport);
#ifdef XTKVIEWPORT		/* Does not work */
    win = XtWindow(viewport);
#else				/* Works */
    win = XCreateWindow(dpy, XtWindow(viewport),
			0, 0, XSIZE, YSIZE, 2, 
			DefaultDepth(dpy, DefaultScreen(dpy)), 
			InputOutput, DefaultVisual(dpy, DefaultScreen(dpy)),
			CWBackPixel | CWBorderPixel, &xswa); 
    XMapWindow(dpy, win); 
#endif

    gc = XCreateGC(dpy, win, 0, 0);
    XSetForeground(dpy, gc, 1);
    XSetBackground(dpy, gc, 0); 
    XSetLineAttributes(dpy, gc, 1, LineSolid, CapButt, JoinMiter);

    for(;;)
    {
	for(i = 0 ; i < 10 ; i ++)
	{
	    XDrawArc(dpy, win, gc, XSIZE >> 1, YSIZE >> 1,
		     i * (XSIZE >> 5) , i * (YSIZE >> 5), 0, 64*360);
	    XSync(dpy, 0);
	}
    }
}