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RasterImageGdiPlusGraphicsContainer Class

Summary

Encapsulates a GDI+ object used when creating a System.Drawing.Graphics surface of a Leadtools.RasterImage.

Syntax

C++

public class RasterImageGdiPlusGraphicsContainer : System.IDisposable

Public Class RasterImageGdiPlusGraphicsContainer  
   Implements System.IDisposable

public ref class RasterImageGdiPlusGraphicsContainer : public System.IDisposable

Remarks

This class holds the System.Drawing.Graphics, System.Drawing.Image and System.Drawing.Region representation of the surface of the Leadtools.RasterImage.

You can then use the members of the RasterImageGdiPlusGraphicsContainer along with GDI+ calls to draw on the surface of the Leadtools.RasterImage.

You can also use the RasterImagePainter.CreateGraphics method to create a GDI+ Graphics object from a Leadtools.RasterImage.

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

Example

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Drawing 
 
<TestMethod()> _ 
Public Sub RasterImageGdiPlusGraphicsContainerExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_CreateGdiPlusGraphics.bmp") 
 
   ' Load the image 
   Using image As RasterImage = codecs.Load(srcFileName) 
 
      ' Create a graphics object for this image surface and draw something on it 
      Using container As RasterImageGdiPlusGraphicsContainer = New RasterImageGdiPlusGraphicsContainer(image) 
         Using g As Graphics = container.Graphics 
            Using b As New SolidBrush(Color.FromArgb(128, 0, 0, 0)) 
               g.FillEllipse(b, New Rectangle(0, 0, image.ImageWidth, image.ImageHeight)) 
            End Using 
         End Using 
      End Using 
 
      ' Save the image back on disk 
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24) 
   End Using 
 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
 
public void RasterImageGdiPlusGraphicsContainerExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_CreateGdiPlusGraphics.bmp"); 
 
   // Load the image 
   using(RasterImage image = codecs.Load(srcFileName)) 
   { 
      // Create a graphics object for this image surface and draw something on it 
      using(RasterImageGdiPlusGraphicsContainer container = new RasterImageGdiPlusGraphicsContainer(image)) 
      { 
         using(Graphics g = container.Graphics) 
         { 
            using(Brush b = new SolidBrush(Color.FromArgb(128, 0, 0, 0))) 
            { 
               g.FillEllipse(b, new Rectangle(0, 0, image.ImageWidth, image.ImageHeight)); 
            } 
         } 
      } 
 
      // Save the image back on disk 
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
   } 
 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}