/* mini X11 drawing demo for Ilja */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <unistd.h>
#include <malloc.h>
#include <stdio.h>

int main(int argc,char *argv[])
{
	Display *display = XOpenDisplay(NULL);
	int screen_num = DefaultScreen(display);
	Window root = RootWindow(display,screen_num);
	Visual *visual = DefaultVisual(display,screen_num);


	Window win = XCreateSimpleWindow(display,root,50,50,456,456,1,0,0);
	XSelectInput(display,win,ExposureMask);
	XMapWindow(display,win);

	XGCValues values;			/* initial values for the GC.   */
	unsigned long valuemask=0;
	GC gc = XCreateGC(display, win, valuemask, &values);

	XSetForeground(display, gc, WhitePixel(display, screen_num));
    
	XEvent event;
	while(1)
	{
		int j=0;
		XNextEvent(display,&event);
		if(event.type == Expose)
		{
			XDrawLine(display,win,gc, 50, 50, 400, 400);
			XDrawLine(display,win,gc, 400, 400, 50, 400);
			XDrawLine(display,win,gc, 50, 400, 50, 50);
			XFlush(display);
		}
	}
	sleep(10);
	XCloseDisplay(display);
	return 0;
}