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AddGdiDataToRegion Method

Summary

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

Syntax

C#
VB
C++
public static void AddGdiDataToRegion( 
   RasterImage image, 
   RasterRegionXForm xform, 
   byte[] data, 
   int dataOffset, 
   RasterRegionCombineMode combineMode 
) 

Public Shared Sub AddGdiDataToRegion( _ 
   ByVal image As RasterImage, _ 
   ByVal xform As RasterRegionXForm, _ 
   ByVal data() As Byte, _ 
   ByVal dataOffset As Integer, _ 
   ByVal combineMode As RasterRegionCombineMode _ 
)  

public: 
static void AddGdiDataToRegion(  
   RasterImage^ image, 
   RasterRegionXForm^ xform, 
   array<byte>^ data, 
   int dataOffset, 
   RasterRegionCombineMode 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 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
An array of System.Byte that defines the region to add.

dataOffset
Byte offset into data where the data starts.

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 GetGdiRegionData method.

To get the region data as GDI+ System.Drawing.Drawing2D.RegionData object, use GetGdiPlusRegionData and AddGdiPlusDataToRegion.

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 AddGdiDataToRegion and GetGdiRegionData to add an elliptical region to a Leadtools.RasterImage, gets the region as a GDI byte array 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 GdiRegionDataExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_GdiRegionDataOriginal.bmp"); 
   string regionFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_GdiRegionData.bin"); 
   string destFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_GdiRegionDataLoaded.bmp"); 
 
   RegionDataBefore(codecs, srcFileName, destFileName1, regionFileName); 
   RegionDataAfter(codecs, srcFileName, destFileName2, regionFileName); 
 
   codecs.Dispose(); 
} 
 
private void RegionDataBefore(RasterCodecs codecs, string imageFileName, string destFileName, string regionFileName) 
{ 
   // Load the image 
   using (RasterImage image = codecs.Load(imageFileName)) 
   { 
      // 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); 
 
      // Draw something on the image 
      InvertCommand command = new InvertCommand(); 
      command.Run(image); 
 
      // Save the region and the image 
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
 
      byte[] data = RasterRegionConverter.GetGdiRegionData(image, null); 
      using (FileStream fs = File.Create(regionFileName)) 
      { 
         fs.Write(data, 0, data.Length); 
      } 
   } 
} 
 
private void RegionDataAfter(RasterCodecs codecs, string imageFileName, string destFileName, string regionFileName) 
{ 
   // Load the image 
   using (RasterImage image = codecs.Load(imageFileName)) 
   { 
      // Load the region from the file and apply it to the image 
      byte[] data; 
 
      using (FileStream fs = File.OpenRead(regionFileName)) 
      { 
         data = new byte[fs.Length]; 
         fs.Read(data, 0, data.Length); 
      } 
 
      RasterRegionConverter.AddGdiDataToRegion(image, null, data, 0, RasterRegionCombineMode.Set); 
 
      // Draw something on the image 
      InvertCommand command = new InvertCommand(); 
      command.Run(image); 
 
      // Save the image 
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
   } 
} 
 
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 GdiRegionDataExample() 
   Dim codecs As New RasterCodecs() 
 
   Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp" 
   Dim destFileName1 As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_GdiRegionDataOriginal.bmp" 
   Dim regionFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_GdiRegionData.bin" 
   Dim destFileName2 As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_GdiRegionDataLoaded.bmp" 
 
   RegionDataBefore(codecs, srcFileName, destFileName1, regionFileName) 
   RegionDataAfter(codecs, srcFileName, destFileName2, regionFileName) 
 
   codecs.Dispose() 
End Sub 
 
Private Sub RegionDataBefore(ByVal codecs As RasterCodecs, ByVal imageFileName As String, ByVal destFileName As String, ByVal regionFileName As String) 
   ' Load the image 
   Using image As RasterImage = codecs.Load(imageFileName) 
      ' 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) 
 
      ' Draw something on the image 
      Dim command As New InvertCommand() 
      command.Run(image) 
 
      ' Save the region and the image 
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24) 
 
      Dim data() As Byte = RasterRegionConverter.GetGdiRegionData(image, Nothing) 
      Using fs As FileStream = File.Create(regionFileName) 
         fs.Write(data, 0, data.Length) 
      End Using 
   End Using 
End Sub 
 
Private Sub RegionDataAfter(ByVal codecs As RasterCodecs, ByVal imageFileName As String, ByVal destFileName As String, ByVal regionFileName As String) 
   ' Load the image 
   Using image As RasterImage = codecs.Load(imageFileName) 
      ' Load the region from the file and apply it to the image 
      Dim data() As Byte 
 
      Using fs As FileStream = File.OpenRead(regionFileName) 
         ReDim data(CType(fs.Length, Integer) - 1) 
         fs.Read(data, 0, data.Length) 
      End Using 
 
      RasterRegionConverter.AddGdiDataToRegion(image, Nothing, data, 0, RasterRegionCombineMode.Set) 
 
      ' Draw something on the image 
      Dim command As New InvertCommand() 
      command.Run(image) 
 
      ' Save the image 
      codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24) 
   End Using 
End Sub 

Requirements

Target Platforms

Help Version 20.0.2018.6.20
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Leadtools.Drawing Assembly