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AddRegionToRegion(RasterImage,RasterRegionXForm,Region,RasterRegionCombineMode) Method

Summary

Creates or updates a LEADTOOLS image region by adding the specified GDI+ region.

Syntax

C#
VB
C++
public static void AddRegionToRegion( 
   RasterImage image, 
   RasterRegionXForm xform, 
   Region region, 
   RasterRegionCombineMode combineMode 
) 
Public Overloads Shared Sub AddRegionToRegion( _ 
   ByVal image As Leadtools.RasterImage, _ 
   ByVal xform As Leadtools.RasterRegionXForm, _ 
   ByVal region As Region, _ 
   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) in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the image view perspective.

region
The GDI+ region to add.

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

Remarks

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 Leadtools.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.

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

Example

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
public void AddRegionToRegionGdip_Example() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_ConvertToRegion.bmp"); 
   string destFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_AddRegionToRegion.bmp"); 
 
   // Load the image 
   RasterImage image = codecs.Load(srcFileName); 
 
   // Add an ellipse inside a rectangle region to the image 
 
   LeadRect rc = new LeadRect(image.Width / 3, image.Height / 3, image.Width / 3, image.Height / 3); 
   image.AddEllipseToRegion(null, rc, RasterRegionCombineMode.Set); 
 
   // Create a GDI+ image from this raster image, then obtain a Graphics 
   // object to the GDI+ image, apply the region to it then fill it with red color 
   Region region; 
 
   using (Image gdiPlusImage = RasterImageConverter.ConvertToImage(image, ConvertToImageOptions.None)) 
   { 
      using (Graphics graphics = Graphics.FromImage(gdiPlusImage)) 
      { 
         using (RasterRegion rasterRegion = image.GetRegion(null)) 
         { 
            region = RasterRegionConverter.ConvertToRegion(rasterRegion, null); 
            graphics.Clip = region; 
 
            // This call should only fill the ellipse 
            graphics.FillRectangle(Brushes.Red, 0, 0, image.Width, image.Height); 
         } 
      } 
 
      gdiPlusImage.Save(destFileName1, ImageFormat.Bmp); 
   } 
 
   // Empty the region in the raster image and re-add it through the 
   // region object we got with AddRegionToRegion 
   image.MakeRegionEmpty(); 
 
   RasterRegionConverter.AddRegionToRegion(image, null, region, RasterRegionCombineMode.Set); 
   FillCommand command = new FillCommand(); 
   command.Color = RasterColor.FromKnownColor(RasterKnownColor.Red); 
   command.Run(image); 
   codecs.Save(image, destFileName2, RasterImageFormat.Bmp, 24); 
 
   region.Dispose(); 
   image.Dispose(); 
   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 AddRegionToRegionGdip_Example() 
   Dim codecs As New RasterCodecs() 
 
   Dim srcFileName As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1.cmp" 
   Dim destFileName1 As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_ConvertToRegion.bmp" 
   Dim destFileName2 As String = LeadtoolsExamples.Common.ImagesPath.Path + "Image1_AddRegionToRegion.bmp" 
 
   ' Load the image 
   Dim image As RasterImage = codecs.Load(srcFileName) 
 
   ' Add an ellipse inside a rectangle region to the image 
 
   Dim rc As New LeadRect(image.Width \ 3, image.Height \ 3, image.Width \ 3, image.Height \ 3) 
   image.AddEllipseToRegion(Nothing, rc, RasterRegionCombineMode.Set) 
 
   ' Create a GDI+ image from this raster image, then obtain a Graphics 
   ' object to the GDI+ image, apply the region to it then fill it with red color 
   Dim region As Region 
 
   Using gdiPlusImage As Image = RasterImageConverter.ConvertToImage(image, ConvertToImageOptions.None) 
      Using graphics As Graphics = graphics.FromImage(gdiPlusImage) 
         Using rasterRegion As RasterRegion = image.GetRegion(Nothing) 
            region = RasterRegionConverter.ConvertToRegion(rasterRegion, Nothing) 
            graphics.Clip = region 
 
            ' This call should only fill the ellipse 
            graphics.FillRectangle(Brushes.Red, 0, 0, image.Width, image.Height) 
         End Using 
      End Using 
 
      gdiPlusImage.Save(destFileName1, ImageFormat.Bmp) 
   End Using 
 
   ' Empty the region in the raster image and re-add it through the 
   ' region object we got with AddRegionToRegion 
   image.MakeRegionEmpty() 
 
   RasterRegionConverter.AddRegionToRegion(image, Nothing, region, RasterRegionCombineMode.Set) 
   Dim command As New FillCommand() 
   command.Color = RasterColor.FromKnownColor(RasterKnownColor.Red) 
   command.Run(image) 
   codecs.Save(image, destFileName2, RasterImageFormat.Bmp, 24) 
 
   region.Dispose() 
   image.Dispose() 
   codecs.Dispose() 
End Sub 

Requirements

Target Platforms

Help Version 19.0.2017.10.18
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Leadtools.Drawing Assembly