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RasterRegionConverter Class

Summary

Converts between a LEADTOOLS Leadtools.RasterRegion and GDI HRGN and System.Drawing (GDI+) System.Drawing.Region objects.

Syntax

C#
VB
C++
public static class RasterRegionConverter 
Public MustInherit NotInheritable Class RasterRegionConverter  
public ref class RasterRegionConverter abstract sealed  

Remarks

This class lets you easily convert between a LEADTOOLS Leadtools.RasterRegion object and a GDI HRGN or System.Drawing (GDI+) System.Drawing.Region object.

The LEADTOOLS Leadtools.RasterRegion class provides a platform independent representation of an area of interest in a Leadtools.RasterImage that can be used in any platform supported by LEADTOOLS such as GDI, GDI+, WPF and Silverlight. Use this class To convert a LEADTOOLS Leadtools.RasterRegion object to/from a GDI HRGN and System.Drawing (GDI+) System.Drawing.Region object.

For more information refer to RasterImage and GDI/GDI+.

Example

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
public void RasterRegionConverterExample() 
{ 
   // 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 
   Region gdipRegion; 
 
   using (GraphicsPath path = new GraphicsPath()) 
   { 
      path.AddEllipse(100, 200, 400, 300); 
      gdipRegion = new Region(path); 
   } 
 
   // Create a RasterRegion from this region 
   using (RasterRegion region = RasterRegionConverter.ConvertFromRegion(gdipRegion)) 
   { 
      // Add this region to the image 
      image.SetRegion(null, region, RasterRegionCombineMode.Set); 
   } 
 
   gdipRegion.Dispose(); 
 
   // 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+ 
      gdipRegion = RasterRegionConverter.ConvertToRegion(region, null); 
   } 
 
   // Move the region 100 pixels to the right and bottom 
   gdipRegion.Translate(100, 100); 
 
   // Re-set it into the image, fill again and save 
   // Create a RasterRegion from this region 
   using (RasterRegion region = RasterRegionConverter.ConvertFromRegion(gdipRegion)) 
   { 
      // Add this region to the image 
      image.SetRegion(null, region, RasterRegionCombineMode.Set); 
   } 
 
   gdipRegion.Dispose(); 
 
   // 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:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Drawing 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
 
Public Sub RasterRegionConverterExample() 
   ' Load an image  
   Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp" 
   Dim dstFileName1 As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_Ellipse.jpg" 
   Dim dstFileName2 As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_EllipseTranslated.jpg" 
 
   Dim codecs As New RasterCodecs() 
 
   Dim image As RasterImage = codecs.Load(srcFileName) 
 
   ' We will add an ellipse region to the image 
 
   ' Using GDI+, create an elliptical region 
   Dim gdipRegion As Region 
 
   Using path As New GraphicsPath() 
      path.AddEllipse(100, 200, 400, 300) 
      gdipRegion = New Region(path) 
   End Using 
 
   ' Create a RasterRegion from this region 
   Using region As RasterRegion = RasterRegionConverter.ConvertFromRegion(gdipRegion) 
      ' Add this region to the image 
      image.SetRegion(Nothing, region, RasterRegionCombineMode.Set) 
   End Using 
 
   gdipRegion.Dispose() 
 
   ' Fill the image with a color 
   Dim cmd As 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 region As RasterRegion = image.GetRegion(Nothing) 
      ' Convert it to GDI+ 
      gdipRegion = RasterRegionConverter.ConvertToRegion(region, Nothing) 
   End Using 
 
   ' Move the region 100 pixels to the right and bottom 
   gdipRegion.Translate(100, 100) 
 
   ' Re-set it into the image, fill again and save 
   ' Create a RasterRegion from this region 
   Using region As RasterRegion = RasterRegionConverter.ConvertFromRegion(gdipRegion) 
      ' Add this region to the image 
      image.SetRegion(Nothing, region, RasterRegionCombineMode.Set) 
   End Using 
 
   gdipRegion.Dispose() 
 
   ' 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() 
End Sub 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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Leadtools.Drawing Assembly