#include <X11/Xlib.h>
#include <X11/Xutil.h>

int main(int argc, char *argv[]){
    Display *display;
    Window window;
    GC     gc, gc_clr;
    XEvent event;
    Pixmap pixmap;
    char title[]      = "This is TITLE";
    char icon_title[] = "ICON!";
    unsigned long background;
    unsigned long foreground;
    int oldx=0, x=0;
    int dx=1;
    int arcsize=100;
    int window_width=300;
    int window_height=200;
    

    display = XOpenDisplay(NULL);

    background = WhitePixel(display, 0);
    foreground = BlackPixel(display, 0);

    window = XCreateSimpleWindow(display,
                                 DefaultRootWindow(display),
                                 0, 0, window_width, window_height,
                                 0, 0, background);
    pixmap = XCreatePixmap(display, window, window_width, window_height,
			   DefaultDepth(display, 0));

    XSetStandardProperties(display, window, title, icon_title,
			   None, argv, argc, NULL);

    gc = XCreateGC(display, window, 0, 0);
    XSetBackground(display, gc, background);
    XSetForeground(display, gc, foreground);

    gc_clr = XCreateGC(display, window, 0, 0);
    XSetBackground(display, gc_clr, background);
    XSetForeground(display, gc_clr, background);

    XMapRaised(display, window);

    while (1){
	XFillRectangle(display, pixmap, gc_clr, 0, 0, window_width, window_height);
	XFillArc(display, pixmap, gc, x, 50, arcsize, arcsize, 0, 360*64);
	XCopyArea(display, pixmap, window, gc, 0, 0, window_width, window_height, 0, 0);
	XFlush(display);

	oldx = x;
	x += dx;

	if ( x==0 ){
	    dx=1;
	} else if ( x==(window_width-arcsize) ){
	    dx=-1;
	}
    }
}