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GetGdiPlusRegionData Method

Summary
Gets the GDI+ data that describes the image region.
Syntax
C#
C++/CLI
Python
public static RegionData GetGdiPlusRegionData( 
   RasterImage image, 
   RasterRegionXForm xform 
) 
public: 
static RegionData^ GetGdiPlusRegionData(  
   RasterImage^ image, 
   RasterRegionXForm^ xform 
)  
def GetGdiPlusRegionData(self,image,xform): 

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.

Return Value

A System.Drawing.Drawing2D.RegionData object that contains the information that describes the region in this Leadtools.RasterImage object.

Remarks

Used with AddGdiPlusDataToRegion to load or save an image region.

The data returned by this method is the equivalent of the data returned using the GDI+ System.Drawing.Region.GetRegionData 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 RasterImage and GDI/GDI+.

Example
C#
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:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 22.0.2023.3.31
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Leadtools.Drawing Assembly
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.