Conference bulova::decw_jan-89_to_nov-90

    Here is a piece of code that reproduce this "strange behaviour".
    
    Compile it (pay attention to default search list for include) &
    link with xlib.
    
    I have tested it also on a GPX VMS5.2 and the behaviour is the
    same!
    
    Try to resize the window!
    
    ----- Gravity.c -------------------------------------
    
#include <stdio.h>
#include <Xlib.h>

#define screenNumber    DefaultScreen(display)
#define rootWindow      RootWindow(display,screenNumber)
#define blackPixel      BlackPixel(display,screenNumber)
#define whitePixel      WhitePixel(display,screenNumber)
#define defaultGC       DefaultGC(display,screenNumber)
#define depth           DefaultDepth(display,screenNumber)

main(argc, argv)
    unsigned int argc;
    char *argv[];
{
    Display *display;
    Window window;
    Window window1;
    unsigned long attribute_mask;
    XSetWindowAttributes window_attributes;

    if (!(display = XOpenDisplay(NULL))) {
        fprintf(stderr, "Can't open display\n");
        exit(0);
    }

    /* Define window attributes and create the window */

    window_attributes.background_pixel = whitePixel;
    window_attributes.event_mask = ExposureMask | StructureNotifyMask |
		SubstructureNotifyMask;
    attribute_mask = CWBackPixel | CWEventMask;
                     

    window = XCreateWindow(display, rootWindow, 100, 100, 300,300, 1,
			depth, CopyFromParent, CopyFromParent, 
			attribute_mask, &window_attributes);

    /* Define window attributes and create the window1 */

    window_attributes.background_pixel = whitePixel;
    window_attributes.win_gravity = CenterGravity;
    window_attributes.event_mask = ExposureMask;
    attribute_mask = CWBackPixel | CWEventMask | CWWinGravity;

    window1 = XCreateWindow(display, window, 30,30, 50, 50, 5,
			depth, CopyFromParent, CopyFromParent,
			attribute_mask, &window_attributes);

    XMapWindow(display, window);
    XMapWindow(display, window1);


    while (1) {
        XEvent event;

        XNextEvent(display, &event);
		XClearWindow(display,window);
		XDrawString(display, window, defaultGC, 10,10, "XXX",3);
		XClearWindow(display,window1);
    }
}
    

From:	DECWIN::ADAMS        21-MAR-1990 16:03:30.20

Basically gravity has been broken from day one. MIT claims to have it correct
in RL4. As far as VMS DECwindows the status is as follows and has been
described in the release notes for V5.3 to present.


	V5.1 (V1) - unknown - I did not own the code and have had QARs for it. 
		I assume it does not work. My suggestion is to move on to a 
		later version.

	V5.3 (V2) - FORGET bit gravity with all window gravities except UNMAP 
		and STATIC works. Still may be corruption problems with bit 
		gravity other than FORGET. (The bit gravities other than 
		FORGET are using unaltered MIT RL3 code.)

	V5.4 Same as V2 Expect that all window gravities work with FORGET bit
		gravity.

	Next Major Release - All gravities are expected to be fixed.


Bill

    Thanks!