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RasterImage Constructor(RasterImage)
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Leadtools Namespace > RasterImage Class > RasterImage Constructor : RasterImage Constructor(RasterImage)



srcImage
The RasterImage from which to create the new RasterImage.
Constructs a new RasterImage from the specified existing RasterImage object.

Syntax

Visual Basic (Declaration) 
Public Function New( _
   ByVal srcImage As RasterImage _
)
Visual Basic (Usage)Copy Code
Dim srcImage As RasterImage
 
Dim instance As RasterImage(srcImage)
C# 
public RasterImage( 
   RasterImage srcImage
)
C++/CLI 
public:
RasterImage( 
   RasterImage^ srcImage
)

Parameters

srcImage
The RasterImage from which to create the new RasterImage.

Example

This example derives a new class from then use the RasterImage(RasterImage) constructor.

Visual BasicCopy Code
' A class that derives from RasterImage
Public Class MyRasterImage : Inherits RasterImage
   Private _myData As Integer
   Public Sub New(ByVal src As RasterImage)

      MyBase.New(src)
      _myData = 0
   End Sub

   Public Property MyData() As Integer
      Get
         Return _myData
      End Get
      Set(ByVal value As Integer)
         _myData = Value
      End Set
   End Property
End Class


Public Sub DerivedRasterImage()
   RasterCodecs.Startup()
   Dim codecs As RasterCodecs = New RasterCodecs()

   Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"

   ' Load the image
   Dim img As RasterImage = codecs.Load(srcFileName)

   ' create a new MyRasterImage instance out of this image
   Dim myImage As MyRasterImage = New MyRasterImage(img)

   ' img is inavlid now and shoule be disposed
   img.Dispose()

   ' Now you can use myImage just like any other RasterImage but with your own data
   myImage.PaintGamma = 50 ' RasterImage property
   myImage.MyData = 10 ' MyRasterImage property

   Debug.Assert(myImage.PaintGamma = 50)
   Debug.Assert(myImage.MyData = 10)

   ' Clean up
   myImage.Dispose()
   codecs.Dispose()
   RasterCodecs.Shutdown()
End Sub
C#Copy Code
// A class that derives from RasterImage 
public class MyRasterImage : RasterImage 
{ 
   private int _myData; 
   public MyRasterImage(RasterImage src) 
      : 
      base(src) 
   { 
      _myData = 0; 
   } 
 
   public int MyData 
   { 
      get 
      { 
         return _myData; 
      } 
      set 
      { 
         _myData = value; 
      } 
   } 
} 
 
 
public void DerivedRasterImage() 
{ 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"; 
 
   // Load the image 
   RasterImage img = codecs.Load(srcFileName); 
 
   // create a new MyRasterImage instance out of this image 
   MyRasterImage myImage = new MyRasterImage(img); 
 
   // img is inavlid now and shoule be disposed 
   img.Dispose(); 
 
   // Now you can use myImage just like any other RasterImage but with your own data 
   myImage.PaintGamma = 50;   // RasterImage property 
   myImage.MyData = 10;       // MyRasterImage property 
 
   Debug.Assert(myImage.PaintGamma == 50); 
   Debug.Assert(myImage.MyData == 10); 
 
   // Clean up 
   myImage.Dispose(); 
   codecs.Dispose(); 
   RasterCodecs.Shutdown(); 
}

Remarks

This constructor will "pull" all the internal data (image pages, metadata, etc) from srcImage and puts a copy of them into the newly created RasterImage.

After calling this constructor, srcImage remains valid and changes to its properties or data will not affect the newly created RasterImage object.

This constructor is useful when deriving your own classes from RasterImage as shown in the example below.

Requirements

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

See Also