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

int main() {
    Display *dpy;
    int scr;
    Window win;
    XSetWindowAttributes xswa;
    char *xservname=NULL;
    GC gc;
    XGCValues gcv;

    if ((dpy=XOpenDisplay(xservname)) == NULL) {
	fprintf(stderr,"can not open %s\n",XDisplayName(xservname));
	exit(-1);
    }
    scr = DefaultScreen(dpy);
    xswa.background_pixel = WhitePixel(dpy,scr);
    xswa.border_pixel = BlackPixel(dpy,scr);
    xswa.event_mask = ExposureMask;
    win = XCreateWindow(dpy,RootWindow(dpy,scr),0,0,320,240,1,
			CopyFromParent,CopyFromParent,CopyFromParent,
			CWBackPixel | CWBorderPixel | CWEventMask, &xswa);
    gcv.foreground = BlackPixel(dpy,scr);
    gcv.background = WhitePixel(dpy,scr);
    gc = XCreateGC(dpy,win,GCForeground|GCBackground,&gcv);
    XMapWindow(dpy,win);
    for (;;) {
	XEvent ev;
	XPoint p[6] = {{60,190},{30,235},{107,207},{12,207},{89,235},{60,190}};
	XNextEvent(dpy,&ev);
	switch (ev.type) {
	  case Expose:
	    XClearWindow(dpy,win);
	    XDrawLine(dpy,win,gc,10,10,110,60);
	    XDrawRectangle(dpy,win,gc,10,70,100,50);
	    XFillRectangle(dpy,win,gc,10,130,100,50);
	    XDrawArc(dpy,win,gc,150,10,100,50,0,45*64);
	    XDrawArc(dpy,win,gc,150,10,100,50,90*64,45*64);
	    XDrawArc(dpy,win,gc,150,10,100,50,180*64,45*64);
	    XDrawArc(dpy,win,gc,150,10,100,50,270*64,45*64);
	    XDrawArc(dpy,win,gc,150,70,100,50,0*64,360*64);
	    XFillArc(dpy,win,gc,150,130,100,50,0*64,270*64);
	    XFillPolygon(dpy,win,gc,p,6,Complex,CoordModeOrigin);
	    break;
	  default:
	    printf("unknown event %d\n",ev.type);
	    break;
	}
    }
}