Public Overloads Sub AddPolygonToRegion( _
   ByVal xform As RasterRegionXForm, _
   ByVal points As RasterCollection(Of Point), _
   ByVal fillMode As FillMode, _
   ByVal combineMode As RasterRegionCombineMode _
) 

Visual Basic (Usage)	Copy Code
Dim instance As RasterImage Dim xform As RasterRegionXForm Dim points As RasterCollection(Of Point) Dim fillMode As FillMode Dim combineMode As RasterRegionCombineMode   instance.AddPolygonToRegion(xform, points, fillMode, combineMode)

public void AddPolygonToRegion( 
   RasterRegionXForm xform,
   RasterCollection<Point> points,
   FillMode fillMode,
   RasterRegionCombineMode combineMode
)

public:
void AddPolygonToRegion( 
   RasterRegionXForm^ xform,
   RasterCollection<Point>^ points,
   FillMode fillMode,
   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.

points

A collection of Point objects. The points in the collection must be in the order in which the vertices of the polygon are connected. To create the line that closes the polygon, the last point in the collection is connected to the first point of the collection.

fillMode

Indicates how to handle complex crossing lines.

Value	Meaning
Winding	All pixels that are inside the resulting exterior lines are in the region.
Alternate	The region includes the area between odd-numbered and even-numbered polygon sides on each scan line.

combineMode

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

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

Visual Basic

Copy Code

Public Sub AddPolygonToRegionExample()    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_AddPolygonToRegion.bmp"    ' Load the image    Dim image As RasterImage = codecs.Load(srcFileName)    ' Add a polygon 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 x1 As Integer = image.ImageWidth \ 4    Dim y1 As Integer = image.ImageHeight \ 4    Dim x2 As Integer = image.ImageWidth \ 3    Dim y2 As Integer = image.ImageHeight \ 3    Dim pts As Point() = {New Point(x1, y1), New Point(x2, y1), New Point(x1, y2), New Point(x2, y2)}    image.AddPolygonToRegion(xform, pts, FillMode.Winding, 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#

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public void AddPolygonToRegionExample()  {     RasterCodecs.Startup();     RasterCodecs codecs = new RasterCodecs();       string srcFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp";     string destFileName = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_AddPolygonToRegion.bmp";       // Load the image     RasterImage image = codecs.Load(srcFileName);       // Add a polygon 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;       int x1 = image.ImageWidth / 4;     int y1 = image.ImageHeight / 4;     int x2 = image.ImageWidth / 3;     int y2 = image.ImageHeight / 3;       Point[] pts =     {        new Point(x1, y1),        new Point(x2, y1),        new Point(x1, y2),        new Point(x2, y2)     };       image.AddPolygonToRegion(xform, pts, FillMode.Winding, 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