RasterImagePainter Class

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
 
 
public void PaintExample() 
{ 
   PaintForm f = new PaintForm(); 
   f.ShowDialog(); 
} 
 
class PaintForm : Form 
{ 
   private RasterImage image; 
   private RasterPaintProperties props; 
 
   public PaintForm() 
   { 
      // Load the image 
      RasterCodecs codecs = new RasterCodecs(); 
 
      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"); 
      image = codecs.Load(srcFileName); 
 
      Text = "Normal - doubleclick to change."; 
      props = RasterPaintProperties.Default; 
      props.PaintDisplayMode = RasterPaintDisplayModeFlags.None; 
   } 
 
   protected override void Dispose(bool disposing) 
   { 
      // Clean up 
      if (disposing) 
      { 
         image.Dispose(); 
      } 
 
      base.Dispose(disposing); 
   } 
 
   protected override void OnDoubleClick(EventArgs e) 
   { 
      if ((props.PaintDisplayMode & RasterPaintDisplayModeFlags.ScaleToGray) == RasterPaintDisplayModeFlags.ScaleToGray) 
      { 
         Text = "Normal - doubleclick to change."; 
         props.PaintDisplayMode &= ~RasterPaintDisplayModeFlags.ScaleToGray; 
      } 
      else 
      { 
         Text = "ScaleToGray - doubleclick to change."; 
         props.PaintDisplayMode |= RasterPaintDisplayModeFlags.ScaleToGray; 
      } 
 
      Invalidate(); 
 
      base.OnDoubleClick(e); 
   } 
 
   protected override void OnPaint(PaintEventArgs e) 
   { 
      // Draw the image fit and center on this form 
      LeadRect destRect = LeadRect.FromLTRB(ClientRectangle.Left, ClientRectangle.Top, ClientRectangle.Right, ClientRectangle.Bottom); 
      destRect = RasterImage.CalculatePaintModeRectangle( 
         image.ImageWidth, 
         image.ImageHeight, 
         destRect, 
         RasterPaintSizeMode.Fit, 
         RasterPaintAlignMode.Center, 
         RasterPaintAlignMode.Center); 
      RasterImagePainter.Paint(image, e.Graphics, LeadRect.Empty, destRect, props); 
 
      base.OnPaint(e); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}