PostImagePaint Event

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
class MyForm2 : Form 
{ 
 
   class MyPanel : Panel 
   { 
      protected override void OnPaintBackground(PaintEventArgs pe) 
      { 
         // do nothing 
      } 
   } 
 
   RasterImageViewer viewer; 
   MyPanel panel; 
 
   public MyForm2(string title) 
   { 
      Text = title; 
      Size = new Size(750, 450); 
 
      // Create the raster viewer 
      viewer = new RasterImageViewer(); 
      viewer.DoubleBuffer = true; 
      viewer.Dock = DockStyle.Fill; 
 
      // Load an image into the viewer 
      RasterCodecs codecs = new RasterCodecs(); 
      viewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Sample1.cmp")); 
      codecs.Dispose(); 
 
      // Create the panel 
      panel = new MyPanel(); 
      panel.Parent = this; 
      panel.Width = 400; 
      panel.Height = 400; 
      panel.Dock = DockStyle.Right; 
      panel.BackColor = Color.Beige; 
      panel.BorderStyle = BorderStyle.Fixed3D; 
 
      Controls.Add(panel); 
      panel.BringToFront(); 
 
      Controls.Add(viewer); 
      viewer.BringToFront(); 
 
      panel.Paint += new PaintEventHandler(panel_Paint); 
      viewer.PostImagePaint += new PaintEventHandler(viewer_PostImagePaint); 
      viewer.RedirectImagePaint += new EventHandler(viewer_RedirectImagePaint); 
   } 
 
   void viewer_RedirectImagePaint(object sender, EventArgs e) 
   { 
      panel.Invalidate(); 
   } 
 
   void panel_Paint(object sender, PaintEventArgs e) 
   { 
      if (viewer.Image != null) 
      { 
         int dx = viewer.Image.Width / 2; 
         int dy = viewer.Image.Height / 2; 
         Rectangle dest = viewer.SourceRectangle; 
 
         // move center of image to origin 
         Matrix m1 = new Matrix(1, 0, 0, 1, -dx, -dy); 
 
         // mirror the image 
         Matrix m2 = new Matrix(-1, 0, 0, 1, 0, 0); 
         m1.Multiply(m2, MatrixOrder.Append); 
 
         // move back to original location 
         Matrix m3 = new Matrix(1, 0, 0, 1, dx, dy); 
         m1.Multiply(m3, MatrixOrder.Append); 
 
         // scale image to fit on panel 
         float scaleX = (float)panel.Width / (float)viewer.Image.Width; 
         float scaleY = (float)panel.Height / (float)viewer.Image.Height; 
         Matrix m4 = new Matrix(scaleX, 0, 0, scaleY, 0, 0); 
         m1.Multiply(m4, MatrixOrder.Append); 
 
         // display contents of RaserImageViewer on panel 
         viewer.RedirectPaint( 
            e.Graphics, 
            Rectangle.Empty, //_viewer.SourceRectangle, 
            Rectangle.Empty, 
            Rectangle.Empty, //e.ClipRectangle,  
            m1); 
      } 
   } 
 
   private void viewer_PostImagePaint(object sender, PaintEventArgs e) 
   { 
      Graphics graphics = e.Graphics; 
      GraphicsState graphicsState = graphics.Save(); 
 
      Font font = new Font("Arial", 16); 
      e.Graphics.DrawString("This text stays with the window", font, Brushes.Yellow, new PointF(100, 100)); 
 
      graphics.MultiplyTransform(viewer.Transform); 
      e.Graphics.DrawString("This text stays with the image.", font, Brushes.White, new PointF(100, 200)); 
 
      graphics.Restore(graphicsState); 
      graphics.Flush(); 
   } 
} 
 
public void RasterImageViewer_RedirectPaint(string title) 
{ 
   MyForm2 form = new MyForm2(title); 
   form.ShowDialog(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}