/*
	GDI+ example in C#
*/

using System;
using System.WinForms;
using System.Drawing;
using System.Drawing.Imaging;
using System.Threading;

class Plasma : Form
{
	byte[,] table = new byte[2,256];
	int[] palette;
	
	int factor1 = -2;
	int factor2 = -1;
	int factor3 =  1;
	int factor4 = -2;
	
	int a = 0;
	int b = 0;
	int aa = 0;
	int bb = 0;
	
	Plasma(String title, int w, int h)
	{
		Text = title;
		Width = w;
		Height = h;
		
		palette = createPalette();
		
		Show();
	}
	
	int[] createPalette()
	{
		int[] palette = new int[256];
	
		int red   = 500;
		int green = 320;
		int blue  = 372;

    	for (int i = 0; i < 256; i++)
		{
            table[0,i] = (byte) (Math.Sin( Math.PI*2*i/255 )*127 + 128);
            table[1,i] = (byte) (Math.Cos( Math.PI*2*i/255 )*127 + 128);
            table[1,i] = (byte) (Math.Sin( Math.PI*2*table[1,i]/255 )*127 + 128);

			byte r = (byte) (Math.Cos( Math.PI*2*i/red)*127  + 128);
        	byte g = (byte) (Math.Cos( Math.PI*2*i/green)*127  + 128);
	    	byte b = (byte) (Math.Cos( Math.PI*2*i/blue)*127  + 128);
	    	
	    	palette[i] = r << 16 | g << 8 | b;
		}
		
		return palette;
	}

	unsafe void updateFrame(BitmapData bmpd)
	{
    	a += factor1;
    	b += factor2;
    	
		for (int y = 0; y < bmpd.Height; y++)
		{
		    aa = table[0, (y + a) & 0xFF];
		    bb = table[1, b & 0xFF];

			int *pixels = (int *)(bmpd.Scan0  + (y*bmpd.Stride));
			
			for (int x = 0; x < bmpd.Width; x++)
			{
				int c = table[0, (x+aa) & 0xFF] + table[1, (y+bb) & 0xFF];

				*pixels++ = palette[(c >> 1)];
				
				aa += factor3;
            	bb += factor4;
			}
		}
	}
	
	void drawFrame(Bitmap bmp)
	{
		Graphics g = CreateGraphics();
		
		g.DrawImageUnscaled(bmp, 0, 0);
		
		g.Dispose();
	}
	
	void run()
	{
		Bitmap bmp = new Bitmap(Width, Height, PixelFormat.Format32bppRGB);
		
		Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
		
		while(true)
		{
			BitmapData bmpd = bmp.LockBits(rect, ImageLockMode.WriteOnly, PixelFormat.Format32bppRGB);
			
			updateFrame(bmpd);

			bmp.UnlockBits(bmpd);

			drawFrame(bmp);
		}
	}

	public static void Main()
	{
		Plasma pl = new Plasma("GDI+ example in C#", 320, 200);
		Thread plt = new Thread(new ThreadStart(pl.run));
		plt.Start();
		Application.Run(pl);
		plt.Abort();
	}
}