Public Sub AddEllipseToRegion( _
   ByVal xform As RasterRegionXForm, _
   ByVal rc As Rectangle, _
   ByVal combineMode As RasterRegionCombineMode _
) 

Visual Basic (Usage)	Copy Code
Dim instance As RasterImage Dim xform As RasterRegionXForm Dim rc As Rectangle Dim combineMode As RasterRegionCombineMode   instance.AddEllipseToRegion(xform, rc, combineMode)

public void AddEllipseToRegion( 
   RasterRegionXForm xform,
   Rectangle rc,
   RasterRegionCombineMode combineMode
)

public:
void AddEllipseToRegion( 
   RasterRegionXForm^ xform,
   Rectangle rc,
   RasterRegionCombineMode combineMode
) 

Parameters

xform

RasterRegionXForm object that LEADTOOLS uses to translate between display coordinates and image coordinates. If you specify null (Nothing in Visual Basic) in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the image view perspective.

rc

A Rectangle that represents the bounding rectangle that defines the ellipse.

combineMode

The action to take regarding the existing image region, if one is defined.

This example will load an image, adds an elliptical region to it, run the InvertCommand to show the affected area before saving the image back to disk.

Visual Basic

Copy Code

Public Sub AddEllipseToRegionExample()    RasterCodecs.Startup()    Dim codecs As RasterCodecs = New RasterCodecs()    Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"    Dim destFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_AddEllipseToRegion.bmp"    ' Load the image    Dim image As RasterImage = codecs.Load(srcFileName)    ' Add an elliptical region    Dim xform As RasterRegionXForm = New RasterRegionXForm()    xform.ViewPerspective = RasterViewPerspective.TopLeft    xform.XOffset = 0    xform.YOffset = 0    xform.XScalarDenominator = 1    xform.XScalarNumerator = 1    xform.YScalarDenominator = 1    xform.YScalarNumerator = 1    Dim rc As Rectangle = New Rectangle(image.ImageWidth \ 4, image.ImageHeight \ 4, image.ImageWidth \ 3, image.ImageHeight \ 3)    image.AddEllipseToRegion(xform, rc, RasterRegionCombineMode.Set)    ' Draw something on the image    Dim command As InvertCommand = New InvertCommand()    command.Run(image)    ' Save the image    codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)    image.Dispose()    codecs.Dispose()    RasterCodecs.Shutdown() End Sub

C#

Copy Code

public void AddEllipseToRegionExample()  {     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();       string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp";     string destFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_AddEllipseToRegion.bmp";       // Load the image     RasterImage image = codecs.Load(srcFileName);       // Add an elliptical region       RasterRegionXForm xform = new RasterRegionXForm();     xform.ViewPerspective = RasterViewPerspective.TopLeft;     xform.XOffset = 0;     xform.YOffset = 0;     xform.XScalarDenominator = 1;     xform.XScalarNumerator = 1;     xform.YScalarDenominator = 1;     xform.YScalarNumerator = 1;       Rectangle rc = new Rectangle(image.ImageWidth / 4, image.ImageHeight / 4, image.ImageWidth / 3, image.ImageHeight / 3);     image.AddEllipseToRegion(xform, rc, RasterRegionCombineMode.Set);       // Draw something on the image     InvertCommand command = new InvertCommand();     command.Run(image);       // Save the image     codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);       image.Dispose();     codecs.Dispose();     RasterCodecs.Shutdown();  }

To update an existing region, you specify how the new region is to be combined with the existing one using the combineMode parameter. For more information, refer to RasterRegionCombineMode.

For more information, refer to Creating a Region.

For more information, refer to Saving A Region.

For more information, refer to Working with the Existing Region.

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

Reference