ConvertToRegionHandle Method

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
 
// Windows API to use in this example 
[DllImport("Gdi32")] 
private static extern IntPtr CreateEllipticRgn(int nLeftRect, int nTopRect, int nRightRect, int nBottomRect); 
[DllImport("Gdi32")] 
private static extern int DeleteObject(IntPtr hObject); 
[DllImport("Gdi32")] 
private static extern int OffsetRgn(IntPtr hrgn, int nXOffset, int nYOffset); 
 
public void RasterRegionHandleExample() 
{ 
   // Load an image  
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string dstFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_Ellipse.jpg"); 
   string dstFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_EllipseTranslated.jpg"); 
 
   RasterCodecs codecs = new RasterCodecs(); 
 
   RasterImage image = codecs.Load(srcFileName); 
 
   // We will add an ellipse region to the image 
 
   // Using GDI, create an elliptical region 
   IntPtr gdiRegion = CreateEllipticRgn(100, 200, 100 + 400, 200 + 300); 
 
   // Create a RasterRegion from this region 
   using (RasterRegion region = RasterRegionConverter.ConvertFromRegionHandle(gdiRegion)) 
   { 
      // Add this region to the image 
      image.SetRegion(null, region, RasterRegionCombineMode.Set); 
   } 
 
   DeleteObject(gdiRegion); 
 
   // Fill the image with a color 
   FillCommand cmd = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Red)); 
   cmd.Run(image); 
 
   // Save it 
   codecs.Save(image, dstFileName1, RasterImageFormat.Jpeg, 24); 
 
   // Now get the GDI+ region from the image 
   using (RasterRegion region = image.GetRegion(null)) 
   { 
      // Convert it to GDI+ 
      gdiRegion = RasterRegionConverter.ConvertToRegionHandle(region, null); 
   } 
 
   // Move the region 100 pixels to the right and bottom 
   OffsetRgn(gdiRegion, 100, 100); 
 
   // Re-set it into the image, fill again and save 
   // Create a RasterRegion from this region 
   using (RasterRegion region = RasterRegionConverter.ConvertFromRegionHandle(gdiRegion)) 
   { 
      // Add this region to the image 
      image.SetRegion(null, region, RasterRegionCombineMode.Set); 
   } 
 
   DeleteObject(gdiRegion); 
 
   // Fill the image with a color 
   cmd = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Yellow)); 
   cmd.Run(image); 
 
   // Save it 
   codecs.Save(image, dstFileName2, RasterImageFormat.Jpeg, 24); 
 
   image.Dispose(); 
 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}