public class CairoARGBDemo
{
	static Gtk.Window m_window;

	static void Main ()
	{
		Gtk.Application.Init ();
		m_window = new Gtk.Window ("Cairo ARGB Demo");

		Gdk.Screen screen = m_window.Screen;
		Gdk.Colormap colormap = screen.RgbaColormap;
		if (colormap == null)
			colormap = screen.RgbColormap;
		m_window.Colormap = colormap;
		m_window.Decorated = false;
		m_window.AppPaintable = true;
		m_window.Events |= 	Gdk.EventMask.ButtonPressMask;
		m_window.KeyPressEvent += on_key_press;
		m_window.ButtonPressEvent += on_button_press;
		m_window.ExposeEvent += on_expose;
		m_window.ConfigureEvent += on_configure;
		m_window.Resize (500,500);
		m_window.ShowAll ();
		Gtk.Application.Run ();
	}

	static void on_key_press (object obj, Gtk.KeyPressEventArgs e)
	{
		switch (e.Event.Key)
		{
			case Gdk.Key.q :
			case Gdk.Key.Escape :
				Gtk.Application.Quit ();
			break;
		}

		e.RetVal = true;
	}

	static void on_button_press (object obj, Gtk.ButtonPressEventArgs e)
	{
		if (e.Event.Button == 1)
		{
			m_window.BeginMoveDrag (1,
									(int) e.Event.XRoot,
									(int) e.Event.YRoot,
									e.Event.Time);
		}

		// this doesn't work for some reason
		if (e.Event.Button == 2)
		{
			m_window.BeginResizeDrag (Gdk.WindowEdge.NorthWest,
									  2,
									  (int) e.Event.XRoot,
									  (int) e.Event.YRoot,
									  e.Event.Time);
		}

		e.RetVal = false;
	}

	static void render (Cairo.Context cr, int iWidth, int iHeight)
	{
		cr.Scale (iWidth, iHeight);
		cr.Color = new Cairo.Color (1.0, 1.0, 1.0, 0.0);
		cr.Operator = Cairo.Operator.Source;
		cr.Paint ();
		cr.Color = new Cairo.Color (1.0, 0.0, 0.0, 0.75);
		cr.LineWidth = 0.1;
		cr.MoveTo (0.15f, 0.15f);
		cr.LineTo (0.85f, 0.85f);
		cr.MoveTo (0.85f, 0.15f);
		cr.LineTo (0.15f, 0.85f);
		cr.Stroke ();
		cr.Arc (0.5, 0.5, 0.45, 0.0, 3.141592653/180.0 * 360.0);
		cr.Stroke ();
	}

	static void on_expose (object obj, Gtk.ExposeEventArgs e)
	{
		Gdk.Window window = e.Event.Window;
		Cairo.Context cr = Gdk.CairoHelper.Create (window);

		int iX;
		int iY;
		int iWidth;
		int iHeight;
		int iDepth;
		window.GetGeometry (out iX, out iY, out iWidth, out iHeight, out iDepth);
		render (cr, iWidth, iHeight);

		e.RetVal = true;
	}

	[GLib.ConnectBefore]
	static void on_configure (object obj, Gtk.ConfigureEventArgs e)
	{
	}
}