AddGdiPlusDataToRegion Method

public static void AddGdiPlusDataToRegion( 
   RasterImage image,
   RasterRegionXForm xform,
   RegionData data,
   RasterRegionCombineMode combineMode
)

public:
static void AddGdiPlusDataToRegion( 
   RasterImage^ image,
   RasterRegionXForm^ xform,
   RegionData^ data,
   RasterRegionCombineMode combineMode
)

'Declaration

Public Shared Sub AddGdiPlusDataToRegion( _
   ByVal image As RasterImage, _
   ByVal xform As RasterRegionXForm, _
   ByVal data As RegionData, _
   ByVal combineMode As RasterRegionCombineMode _
)

'Usage

Dim image As RasterImage
Dim xform As RasterRegionXForm
Dim data As RegionData
Dim combineMode As RasterRegionCombineMode
 
RasterRegionConverter.AddGdiPlusDataToRegion(image, xform, data, combineMode)

Parameters

image: The source image.
xform: Leadtools.RasterRegionXForm object that LEADTOOLS uses to translate between display coordinates and image coordinates. If you specify null (Nothing in Visual Basic) for this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the image view perspective.
data: A System.Drawing.Drawing2D.RegionData object that defines the region to add.
combineMode: The action to take regarding the existing image region, if one is defined.

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

This method can be used to copy the region data from one RasterImage to another, using the GetGdiPlusRegionData method.

To get the region data as Windows API HRGN data, use GetGdiRegionData and AddGdiDataToRegion.

To get the region data as platform independent byte array, use RasterRegion.GetData and RasterRegion.SetData.

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.

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

This example will use AddGdiPlusDataToRegion and GetGdiPlusRegionData to add an elliptical region to a Leadtools.RasterImage, gets the region as a GDI+ RegionData object then re-sets it in another image.

C#
Visual Basic

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Drawing
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Color

<TestMethod()> _
Public Sub GdiPlusRegionDataExample()
   Dim codecs As New RasterCodecs()
   Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp"
   Dim destFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_GdiPlusData.bmp"

   Dim gdipRegionData As RegionData = Nothing

   ' Load the source image
   Using image As RasterImage = codecs.Load(srcFileName)
      ' Add a polygon region to it

      ' Add a polygon region to the image
      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 LeadPoint = _
      { _
         New LeadPoint(x1, y1), _
         New LeadPoint(x2, y1), _
         New LeadPoint(x1, y2), _
         New LeadPoint(x2, y2) _
      }

      image.AddPolygonToRegion(Nothing, pts, LeadFillMode.Winding, RasterRegionCombineMode.Set)

      ' Save the region as a GDI+ RegionData object
      gdipRegionData = RasterRegionConverter.GetGdiPlusRegionData(image, Nothing)
   End Using

   ' Re-load the source image
   Using image As RasterImage = codecs.Load(srcFileName)
      ' Add the GDI+ region data we saved to it
      RasterRegionConverter.AddGdiPlusDataToRegion(image, Nothing, gdipRegionData, RasterRegionCombineMode.Set)

      ' Fill this region with Yellow
      Dim cmd As New FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Yellow))
      cmd.Run(image)

      ' Save this image
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)
   End Using

   codecs.Dispose()
End Sub

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;

[TestMethod]
public void GdiPlusRegionDataExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_GdiPlusData.bmp");

   RegionData gdipRegionData = null;

   // Load the source image
   using(RasterImage image = codecs.Load(srcFileName))
   {
      // Add a polygon region to it

      // Add a polygon region to the image
      int x1 = image.ImageWidth / 4;
      int y1 = image.ImageHeight / 4;
      int x2 = image.ImageWidth / 3;
      int y2 = image.ImageHeight / 3;

      LeadPoint[] pts =
      {
         new LeadPoint(x1, y1),
         new LeadPoint(x2, y1),
         new LeadPoint(x1, y2),
         new LeadPoint(x2, y2)
      };

      image.AddPolygonToRegion(null, pts, LeadFillMode.Winding, RasterRegionCombineMode.Set);

      // Save the region as a GDI+ RegionData object
      gdipRegionData = RasterRegionConverter.GetGdiPlusRegionData(image, null);
   }

   // Re-load the source image
   using(RasterImage image = codecs.Load(srcFileName))
   {
      // Add the GDI+ region data we saved to it
      RasterRegionConverter.AddGdiPlusDataToRegion(image, null, gdipRegionData, RasterRegionCombineMode.Set);

      // Fill this region with Yellow
      FillCommand cmd = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Yellow));
      cmd.Run(image);

      // Save this image
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);
   }

   codecs.Dispose();
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms

Reference

RasterRegionConverter Class
RasterRegionConverter Members