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        //druckt die aktuelle Ansicht
        private void printItem_Click(object sender, EventArgs e)
        {
               PrintDialog pd = new PrintDialog();
               pd.Document = this.printDocument1;
               if (DialogResult.OK == pd.ShowDialog())
                  {
                      printDocument1.Print();
                  }
               zeichenFenster.Refresh();
            
        }
        private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
        {
            graph = e.Graphics;
            paintingAll();
             graph = Graphics.FromImage(zeichenFenster.Image);
        }