CalculateRegionArea Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public long CalculateRegionArea()

'Declaration
 
Public Function CalculateRegionArea() As Long

'Usage
 
Dim instance As RasterImage
Dim value As Long
 
value = instance.CalculateRegionArea()

public long CalculateRegionArea()

 function Leadtools.RasterImage.CalculateRegionArea()

public:
int64 CalculateRegionArea();

Return Value

The pixel count.

For more information, refer to Working with the Existing Region.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Public Sub CalculateRegionAreaExample()
      Dim codecs As RasterCodecs = New RasterCodecs()

      Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")

      ' Load the image
      Dim image As RasterImage = codecs.Load(srcFileName)

      ' Add a region to the image
      Dim rc As LeadRect = New LeadRect(image.Width \ 3, image.Height \ 3, image.Width \ 3, image.Height \ 3)
      image.AddEllipseToRegion(Nothing, rc, RasterRegionCombineMode.Set)

      ' Get the number of pixels in the region
      Dim area As Integer = CInt(image.CalculateRegionArea())
      Console.WriteLine("Number of pixels in region after a region is added: {0}", area)

      image.Dispose()
      codecs.Dispose()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

public void CalculateRegionAreaExample()
   {
      RasterCodecs codecs = new RasterCodecs();

      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");

      // Load the image
      RasterImage image = codecs.Load(srcFileName);

      // Add a 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);

      // Get the number of pixels in the region
      long area = image.CalculateRegionArea();
      Console.WriteLine("Number of pixels in region after a region is added: {0}", area);

      image.Dispose();
      codecs.Dispose();
   }

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

RasterImageExamples.prototype.CalculateRegionAreaExample = function ( )
{
   Tools.SetLicense ( ) ;
   with ( Leadtools )
   {
      with ( Leadtools.Codecs ) 
      {
         var codecs = new RasterCodecs();

         var srcFileName = "Assets\\Image1.cmp";
         var image = null ;
         // Load the image
         return Tools.AppInstallFolder().getFileAsync(srcFileName).then ( function ( loadFile ) {
            return codecs.loadAsync(LeadStreamFactory.create(loadFile));})
            .then ( function (img ) {
               image = img ;

               // Add a region to the image
               var rc = LeadRectHelper.create(image.width / 3, image.height / 3, image.width / 3, image.height / 3);
               image.addEllipseToRegion(null, rc, RasterRegionCombineMode.set);

               // Get the number of pixels in the region
               var area = image.calculateRegionArea();
               console.info ("Number of pixels in region after a region is added: ", area);

               image.close();
               codecs.close();
            });
      }
   }
}

[TestMethod]
public async Task CalculateRegionAreaExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Image1.cmp";

   // Load the image
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // Add a region to the image
   LeadRect rc = LeadRectHelper.Create(image.Width / 3, image.Height / 3, image.Width / 3, image.Height / 3);
   image.AddEllipseToRegion(null, rc, RasterRegionCombineMode.Set);

   // Get the number of pixels in the region
   long area = image.CalculateRegionArea();
   Debug.WriteLine("Number of pixels in region after a region is added: {0}", area);

   image.Dispose();
   codecs.Dispose();
}

public void CalculateRegionAreaExample()
{
   // create a new image to work with
   RasterImage image = new RasterImage(RasterMemoryFlags.Conventional, 500, 500, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, null, null, 0);
   // Add a region to the image
   LeadRect rc = new LeadRect(image.Width / 3, image.Height / 3, image.Width / 3, image.Height / 3);
   image.AddRectangleToRegion(null, rc, RasterRegionCombineMode.Set);

   // Get the number of pixels in the region
   long area = image.CalculateRegionArea();
   Debug.WriteLine("Number of pixels in region after a region is added: {0}", area);

   image.Dispose();
}

Public Sub CalculateRegionAreaExample()
   ' create a new image to work with
   Dim image As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 500, 500, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, Nothing, 0)
   ' Add a region to the image
   Dim rc As LeadRect = New LeadRect(image.Width / 3, image.Height / 3, image.Width / 3, image.Height / 3)
   image.AddRectangleToRegion(Nothing, rc, RasterRegionCombineMode.Set)

   ' Get the number of pixels in the region
   Dim area As Long = image.CalculateRegionArea()
   Debug.WriteLine("Number of pixels in region after a region is added: {0}", area)

   image.Dispose()
End Sub

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

RasterImage Class
RasterImage Members