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LEADTOOLS (Leadtools assembly)
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AddPolygonToRegion(RasterRegionXForm,RasterCollection<LeadPoint>,LeadFillMode,RasterRegionCombineMode) Method








Leadtools Namespace > RasterImage Class > AddPolygonToRegion Method : AddPolygonToRegion(RasterRegionXForm,RasterCollection<LeadPoint>,LeadFillMode,RasterRegionCombineMode) Method
RasterRegionXForm object that LEADTOOLS uses to translate between display coordinates and image coordinates. If you specify null in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the image view perspective.
A collection of LeadPoint objects. The points in the collection must be in the order in which the vertices of the polygon are connected. To create the line that closes the polygon, the last point in the collection is connected to the first point of the collection.

Indicates how to handle complex crossing lines.

Value Meaning
LeadPoint.Winding All pixels that are inside the resulting exterior lines are in the region.
LeadFillMode.Alternate The region includes the area between odd-numbered and even-numbered polygon sides on each scan line.

The action to take regarding the existing image region, if one is defined.
Creates or updates the image region by adding a polygonal region.
Syntax
'Declaration
 

Public Overloads Sub AddPolygonToRegion( _
   ByVal xform As RasterRegionXForm, _
   ByVal points As RasterCollection(Of LeadPoint), _
   ByVal fillMode As LeadFillMode, _
   ByVal combineMode As RasterRegionCombineMode _
) 
'Usage
 

Dim instance As RasterImage
Dim xform As RasterRegionXForm
Dim points As RasterCollection(Of LeadPoint)
Dim fillMode As LeadFillMode
Dim combineMode As RasterRegionCombineMode
 
instance.AddPolygonToRegion(xform, points, fillMode, combineMode)
public void addPolygonToRegion(
  RasterRegionXForm xform, 
  RasterCollection<LeadPoint> points, 
  Path.FillType fillType, 
  RasterRegionCombineMode combineMode
)
            
 function Leadtools.RasterImage.AddPolygonToRegion(RasterRegionXForm,RasterCollection{LeadPoint},LeadFillMode,RasterRegionCombineMode)( 
   xform ,
   points ,
   fillMode ,
   combineMode 
)

Parameters

xform
RasterRegionXForm object that LEADTOOLS uses to translate between display coordinates and image coordinates. If you specify null in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the image view perspective.
points
A collection of LeadPoint objects. The points in the collection must be in the order in which the vertices of the polygon are connected. To create the line that closes the polygon, the last point in the collection is connected to the first point of the collection.
fillMode

Indicates how to handle complex crossing lines.

Value Meaning
LeadPoint.Winding All pixels that are inside the resulting exterior lines are in the region.
LeadFillMode.Alternate The region includes the area between odd-numbered and even-numbered polygon sides on each scan line.

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 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.

Example

This example will load an image, add a polygon region to it, and then run the InvertCommand to show the affected area before saving the image back to disk.

Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg

      
Public Sub AddPolygonToRegionExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_AddPolygonToRegion.bmp")

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

   ' Add a polygon region

   Dim xform As RasterRegionXForm = New RasterRegionXForm()
   xform.ViewPerspective = RasterViewPerspective.TopLeft
   xform.XOffset = 0
   xform.YOffset = 0
   xform.XScalarDenominator = 1
   xform.XScalarNumerator = 1
   xform.YScalarDenominator = 1
   xform.YScalarNumerator = 1

   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(xform, pts, LeadFillMode.Winding, RasterRegionCombineMode.Set)

   ' Draw something on the image
   Dim command As InvertCommand = New InvertCommand()
   command.Run(image)

   ' Save the image
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)

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

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using Leadtools.Svg;

      
public void AddPolygonToRegionExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
   string destFileName = Path.Combine(ImagesPath.Path, "Image1_AddPolygonToRegion.bmp");

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

   // Add a polygon region

   RasterRegionXForm xform = new RasterRegionXForm();
   xform.ViewPerspective = RasterViewPerspective.TopLeft;
   xform.XOffset = 0;
   xform.YOffset = 0;
   xform.XScalarDenominator = 1;
   xform.XScalarNumerator = 1;
   xform.YScalarDenominator = 1;
   xform.YScalarNumerator = 1;

   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(xform, pts, LeadFillMode.Winding, RasterRegionCombineMode.Set);

   // Draw something on the image
   InvertCommand command = new InvertCommand();
   command.Run(image);

   // Save the image
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);

   image.Dispose();
   codecs.Dispose();
}
RasterImageExamples.prototype.AddPolygonToRegionExample = function () {
   Tools.SetLicense();
   with (Leadtools) {
      with (Leadtools.Codecs) {
         var codecs = new RasterCodecs();

         var srcFileName = "Assets\\Image1.cmp";
         var destFileName = "Image1_AddPolygonToRegion.bmp";
         var image;
         // Load the image
         return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
            return codecs.loadAsync(LeadStreamFactory.create(loadFile))
         })
            .then(function (img) {
               image = img;

               // Add a polygon region

               var xform = new RasterRegionXForm();
               xform.viewPerspective = RasterViewPerspective.topLeft;
               xform.xoffset = 0;
               xform.yoffset = 0;
               xform.xscalarDenominator = 1;
               xform.xscalarNumerator = 1;
               xform.yscalarDenominator = 1;
               xform.yscalarNumerator = 1;

               var x1 = image.imageWidth / 4;
               var y1 = image.imageHeight / 4;
               var x2 = image.imageWidth / 3;
               var y2 = image.imageHeight / 3;

               var pts =
               [
                  LeadPointHelper.create(x1, y1),
                  LeadPointHelper.create(x2, y1),
                  LeadPointHelper.create(x1, y2),
                  LeadPointHelper.create(x2, y2)
               ];

               image.addPolygonToRegion(xform, pts, LeadFillMode.winding, RasterRegionCombineMode.set);

               // Draw something on the image
               var command = new Leadtools.ImageProcessing.Color.InvertCommand();
               command.run(image);

               // Save the image
               return Tools.AppLocalFolder().createFileAsync(destFileName)
            })
            .then(function (saveFile) {
               var saveStream = LeadStreamFactory.create(saveFile);
               return codecs.saveAsync(image, saveStream, RasterImageFormat.bmp, 24)
            })
            .then(function () {

               image.close();
               codecs.close();
            });
      }
   }
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;

      
public async Task AddPolygonToRegionExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Image1.cmp";
   string destFileName = @"Image1_AddPolygonToRegion.bmp";

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

   // Add a polygon region

   RasterRegionXForm xform = new RasterRegionXForm();
   xform.ViewPerspective = RasterViewPerspective.TopLeft;
   xform.XOffset = 0;
   xform.YOffset = 0;
   xform.XScalarDenominator = 1;
   xform.XScalarNumerator = 1;
   xform.YScalarDenominator = 1;
   xform.YScalarNumerator = 1;

   int x1 = image.ImageWidth / 4;
   int y1 = image.ImageHeight / 4;
   int x2 = image.ImageWidth / 3;
   int y2 = image.ImageHeight / 3;

   LeadPoint[] pts =
   {
      LeadPointHelper.Create(x1, y1),
      LeadPointHelper.Create(x2, y1),
      LeadPointHelper.Create(x1, y2),
      LeadPointHelper.Create(x2, y2)
   };

   image.AddPolygonToRegion(xform, pts, LeadFillMode.Winding, RasterRegionCombineMode.Set);

   // Draw something on the image
   InvertCommand command = new InvertCommand();
   command.Run(image);

   // Save the image
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
   ILeadStream saveStream = LeadStreamFactory.Create(saveFile);
   await codecs.SaveAsync(image, saveStream, RasterImageFormat.Bmp, 24);

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

Target Platforms

See Also

Reference

RasterImage Class
RasterImage Members
Overload List

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