Hello,
Hello Peter,

I advance now.
But with the transformation, I have problems.
And also with the zeropoint.

I need a function like this

SetZeropoint (Left_Bottom)
SetZeropoint (Left_Top)
SetZeropoint (Right_Bottom)
SetZeropoint (Right_Top)

Perhaps you help me again.

SetDimensionin_MM(0,0,900,900)
or
SetDimensionin_MM(0,0,400,200)

I use a normal Windows Form Application and insert a panel.

private System.Windows.Forms.Panel panel_draw;

The boardnumber I need in a smal red color. How can I make it?

Regards Thomas
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The code is
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Drawing.Drawing2D;

namespace Grafik
{
 public partial class Form1 : Form
 {
   public List<CODES> ListCodes;

   public class CODES
   {
     private double x;
     private double y;

     private int boardNumber;

     public double X
     {
       get { return x; }
       set { x = value; }
     }

     public double Y
     {
       get { return y; }
       set { y = value; }
     }

     public int BoardNumber
     {
       get { return boardNumber; }
       set { boardNumber = value; }
     }

     public void Init( )
     {
       X = 0;
       Y = 0;
       boardNumber = 0;
     }
   }

   public Form1( )
   {
     InitializeComponent();
   }

   private void Form1_Load( object sender, EventArgs e )
   {
     ListCodes = new List<CODES>();
     CODES obj;

     int boardnumber = 0;
     for ( int j = 0; j < 4; j++ )
     {
       for ( int i = 0; i < 5; i++ )
       {
         boardnumber++;
          obj = new CODES();
          obj.Init();
          obj.X = obj.X + (j * 30);
          obj.Y = obj.Y + (i * 15);
          obj.BoardNumber = boardnumber;
          ListCodes.Add( obj );
       }
     }
   }

   float ScaleX, ScaleY;

   private void MapMillimetersToPixels( Graphics gfx, Rectangle
rectPixels, Rectangle rectMm )
   {
     Matrix matrix = new Matrix();
     ScaleX = (float)rectPixels.Width / rectMm.Width;
     ScaleY = (float)rectPixels.Height / rectMm.Height;
     matrix.Scale( ScaleX, ScaleY );
     matrix.Translate( rectPixels.Left - ScaleX * rectMm.Left,
                       rectPixels.Top  - ScaleY * rectMm.Top );

     gfx.Transform = matrix;
   }

   private int MillimetersToPixels_X( double value )
   {
     return Convert.ToInt32(ScaleX * value);
   }

   private int MillimetersToPixels_Y( double value )
   {
     return Convert.ToInt32(ScaleY * value);
   }

   public void DrawPanel( List<CODES> listCodes, PaintEventArgs e )
   {
     Graphics gfx; // the Graphics instance; for example, taken from
PaintEventArgs
     gfx = e.Graphics;

     Rectangle rectMM = new Rectangle( 0, 0, 400, 200 );
     Rectangle rectPixel = new Rectangle( 0, 0, 490, 490 );

     rectPixel = panel_draw.DisplayRectangle;
     MapMillimetersToPixels( gfx, rectPixel, rectMM );

    // panel_draw.RectangleToClient( rectPixel );

     //MapMillimetersToPixels( gfx, rectPixel, rectMM );

//      gfx.DrawRectangle( Pens.Red, 0, 0,
MillimetersToPixels_X( 200 ), MillimetersToPixels_Y( 77 ) );
//    gfx.DrawRectangle( Pens.Red, 5, 5, MillimetersToPixels_X( 200 ),
MillimetersToPixels_Y(77) );

     //Point[] rgpt; // some array of points
     //rgpt = new Point[20];
     //int ipointCur = 0;
     Point ptCur; // = rgpt[ipointCur];
     string strPoint;// = "P" + ipointCur;

     //for ( int j = 0; j < 20; j++ )
     //{
     //  rgpt[j].X = 50;
     //  rgpt[j].Y = (j*6 ) + 20;
     //}

     ptCur = new Point();
     foreach ( CODES code in listCodes )
     {
       ptCur.X = MillimetersToPixels_Y(code.X);
       ptCur.Y = MillimetersToPixels_Y(code.Y);

       // These two lines of code draw the cross
       gfx.DrawLine( Pens.Black, ptCur.X - 5, ptCur.Y, ptCur.X + 5,
ptCur.Y );
       gfx.DrawLine( Pens.Black, ptCur.X, ptCur.Y - 5, ptCur.X,
ptCur.Y + 5 );

       // This block of code draws the label for the point
       using ( Brush brush = new SolidBrush( ForeColor ) )
       {
         strPoint = "P" + code.BoardNumber + "(" + code.X +"," +
code.Y + ")";
         gfx.DrawString( strPoint, Font, brush, ptCur.X + 10,
ptCur.Y );
       }
     }
     //rectPixel = panel_draw.DisplayRectangle;
     //MapMillimetersToPixels( gfx, rectPixel, rectMM );

   }

   private void panel_draw_Paint( object sender, PaintEventArgs e )
   {
     DrawPanel( ListCodes, e );
   }
 }
}