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AddGdiPlusDataToRegion Method

Summary

Creates or updates a LEADTOOLS image region using the specified GDI+ region data.

Syntax

C#
VB
C++
public static void AddGdiPlusDataToRegion( 
   RasterImage image, 
   RasterRegionXForm xform, 
   RegionData data, 
   RasterRegionCombineMode combineMode 
) 
Public Shared Sub AddGdiPlusDataToRegion( _ 
   ByVal image As Leadtools.RasterImage, _ 
   ByVal xform As Leadtools.RasterRegionXForm, _ 
   ByVal data As RegionData, _ 
   ByVal combineMode As Leadtools.RasterRegionCombineMode _ 
)  

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 VB) 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.

Remarks

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+.

Example

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#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
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"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Drawing 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
 
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 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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Leadtools.Drawing Assembly