printing form in C#

I forgot that my application already contained a handler and function:

this.PrintDocument_inst.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.k_line_PrintPage);

private void k_line_PrintPage(object sender,PrintPageEventArgs ppea)

which latter includes the following code block in which I was able to alter the value of  _scale_f  to obtain the result I needed


float _scale_f;
if ( PrintDialog_inst != null )
{
  string str_printer_name = PrintDialog_inst.PrinterSettings.PrinterName.ToString ( );
  switch( str_printer_name )
  {
  case "Adobe PDF":
   _scale_f = 0.85F;
   break;
 
  case "Microsoft XPS Document Writer":
   _scale_f = 0.80F; // 0.85F; 
   break;
 
  default:
   _scale_f = 0.94F; // 1.0f; // 0.59F; // 
   break;
 }
}
else // case of print preview
{
   _scale_f = 0.59F; // 0.82F;
}
 
if ( _scale_f != 1.0F ) ppea.Graphics.ScaleTransform ( _scale_f, _scale_f );
ppea.Graphics.DrawImage ( plot_metafile, leftMargin, topMargin );
ppea.HasMorePages = ( --n_pages_still_to_print > 0 ? true : false );