Clock

using System;
using Gtk;
using Cairo;

class Simpleclock : DrawingArea
{

    private static Gtk.Window win = null;


    static void Main()
    {
        Application.Init();
        new Simpleclock();
        Application.Run();
    }


    Simpleclock()
    {
        win = new Window("Simpleclock");
        win.SetDefaultSize(256, 256);
        win.DeleteEvent += new DeleteEventHandler(OnQuit);
        GLib.Timeout.Add(500, UpdateClock);
        win.Add(this);
        win.ShowAll();
    }


    void Draw(Context cr, uint width, uint height)
    {
        uint boxSize = Math.Min(width, height);

        DateTime date = DateTime.Now;

        cr.Save();
        cr.Color = new Color(1, 1, 1);
        cr.Rectangle(0, 0, width, height);
        cr.Fill();


        cr.Translate((width - boxSize) / 2.0, (height - boxSize) / 2.0);

        cr.Scale(boxSize / 2.0, boxSize / 2.0);

        cr.Translate(1.0, 1.0);

        cr.Rotate(-Math.PI / 2.0);


        DrawClockFace(cr);
        DrawHourHand(cr, (uint)date.Hour);
        DrawMinuteHand(cr, (uint)date.Minute);
        DrawSecondHand(cr, (uint)date.Second);
        DrawPin(cr);
        cr.Restore();
    }


    void DrawClockFace(Context cr)
    {
        cr.Save();
        cr.Color = new Color(0, 0, 0);
        cr.Arc(0.0, 0.0, 0.95, 0.0, 2.0 * Math.PI);
        cr.LineWidth = 0.01;
        cr.Stroke();
        cr.Restore();
    }


    void DrawHourHand(Context cr, uint hour)
    {
        double rot = (double)(hour % 12) / 12.0;
        cr.Save();
        cr.Rotate(rot * Math.PI * 2.0);
        cr.Rectangle(0.0, -0.1, 0.6, 0.2);
        cr.Color = new Color(0, 0, 0);
        cr.Fill();
        cr.Restore();
    }


    void DrawMinuteHand(Context cr, uint minute)
    {
        double rot = (double)minute / 60.0;
        cr.Save();
        cr.Rotate(rot * Math.PI * 2.0);
        cr.Rectangle(0.0, -0.05, 0.8, 0.1);
        cr.Color = new Color(0, 0, 0);
        cr.Fill();
        cr.Restore();
    }


    void DrawSecondHand(Context cr, uint second)
    {
        double rot = (double)second / 60.0;
        cr.Save();
        cr.Rotate(rot * Math.PI * 2.0);
        cr.Rectangle(0.0, -0.025, 0.9, 0.05);
        cr.Color = new Color(0, 0, 0);
        cr.Fill();
        cr.Restore();
    }


    void DrawPin(Context cr)
    {
        cr.Save();
        cr.Arc(0.0, 0.0, 0.1, 0.0, 2.0 * Math.PI);
        cr.Color = new Color(0, 0, 0);
        cr.Fill();
        cr.Restore();
    }


    private static bool UpdateClock()
    {
        win.QueueDraw();
        return true;
    }


    protected override bool OnExposeEvent(Gdk.EventExpose e)
    {
        using (Context cr = Gdk.CairoHelper.Create(e.Window))
        {
            int w, h;
            e.Window.GetSize(out w, out h);
            Draw(cr, (uint)w, (uint)h);
        }
        return true;
    }


    void OnQuit(object sender, DeleteEventArgs e)
    {
        Application.Quit();
    }
}