mono/mcs/class/System.Drawing/Samples/General/hering.cs

//
// hering.cs 
// Creates image for Hering illusion.
// Converted to C# from Xr demo application.
//
// Author:
//   Alexandre Pigolkine([email protected])
// 
//
// Copyright (C) Ximian, Inc.  http://www.ximian.com
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
 
namespace MonoSamples.System.Drawing
{
	public class Hering
	{
		public static void Main (String[] args) {

			float width = 400.0F;
			float height = 800.0F;
			Bitmap bmp = new Bitmap ((int) width, (int) height);
			Graphics gr = Graphics.FromImage (bmp);
			gr.Clear (Color.White);

			int LINES = 32;
			float MAX_THETA  = (.80F * 90.0F);
			float THETA  = (2 * MAX_THETA / (LINES-1));

			GraphicsState oldState = gr.Save ();

			Pen blackPen = new Pen (Color.Black, 2.0F);
	 		gr.TranslateTransform (width / 2.0F, height / 2.0F);
			gr.RotateTransform (MAX_THETA);
			for ( int i = 0; i < LINES; i++) {
				gr.DrawLine (blackPen, -2.0F * width, 0.0F, 2.0F * width, 0.0F);
				gr.RotateTransform (-THETA);
			}

			gr.Restore (oldState);

			Pen redPen = new Pen (Color.Red, 6F);
			gr.DrawLine (redPen, width / 4F, 0F, width / 4F, height);
			gr.DrawLine (redPen, 3F * width / 4F, 0F, 3F * width / 4F, height);

			/* save image in all the formats */   
			bmp.Save ("hering.png", ImageFormat.Png);
			Console.WriteLine ("output file hering.png");
			bmp.Save ("hering.jpg", ImageFormat.Jpeg);
			Console.WriteLine ("output file hering.jpg");
			bmp.Save ("hering.bmp", ImageFormat.Bmp);
			Console.WriteLine ("output file hering.bmp");
		}
	}
}