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AddPolygonToRegion(RasterRegionXForm,IList<LeadPoint>,LeadFillMode,RasterRegionCombineMode) Method

Summary

Creates or updates the image region by adding a polygonal region.

Syntax
C#
VB
Java
C++
Public Overloads Sub AddPolygonToRegion( _ 
   ByVal xform As RasterRegionXForm, _ 
   ByVal points As IList(Of LeadPoint), _ 
   ByVal fillMode As LeadFillMode, _ 
   ByVal combineMode As RasterRegionCombineMode _ 
)  
public void addPolygonToRegion( 
  RasterRegionXForm xform,  
  List<LeadPoint> points,  
  Path.FillType fillType,  
  RasterRegionCombineMode 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.
Fill Mode

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.

C#
VB
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 LeadtoolsExamples.Common; 
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(); 
} 
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 

Requirements

Target Platforms

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