AddEllipseToRegion Method

Summary

Creates or updates the image region by adding an elliptical region.

Syntax

Objective-C

C++

Java

public void AddEllipseToRegion( 
   RasterRegionXForm xform, 
   LeadRect rc, 
   RasterRegionCombineMode combineMode 
)

Public Sub AddEllipseToRegion( _ 
   ByVal xform As RasterRegionXForm, _ 
   ByVal rc As LeadRect, _ 
   ByVal combineMode As RasterRegionCombineMode _ 
)

- (BOOL)addEllipseToRegion:(nullable LTRasterRegionXForm *)xform  
                      rect:(LeadRect)rect  
               combineMode:(LTRasterRegionCombineMode)combineMode  
                     error:(NSError **)error

public void addEllipseToRegion( 
  RasterRegionXForm xform,  
  LeadRect rc,  
  RasterRegionCombineMode combineMode 
)

public: 
void AddEllipseToRegion(  
   RasterRegionXForm^ xform, 
   LeadRect rc, 
   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.

rc
A LeadRect that represents the bounding rectangle that defines the ellipse.

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, adds an elliptical region to it, run the InvertCommand to show the affected area before saving the image back to disk.

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 AddEllipseToRegionExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp"); 
   string destFileName = Path.Combine(ImagesPath.Path, "Image1_AddEllipseToRegion.bmp"); 
 
   // Load the image 
   RasterImage image = codecs.Load(srcFileName); 
 
   // Add an elliptical 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; 
 
   LeadRect rc = new LeadRect(image.ImageWidth / 4, image.ImageHeight / 4, image.ImageWidth / 3, image.ImageHeight / 3); 
   image.AddEllipseToRegion(xform, rc, 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 AddEllipseToRegionExample() 
   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_AddEllipseToRegion.bmp") 
 
   ' Load the image 
   Dim image As RasterImage = codecs.Load(srcFileName) 
 
   ' Add an elliptical 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 rc As LeadRect = New LeadRect(image.ImageWidth \ 4, image.ImageHeight \ 4, image.ImageWidth \ 3, image.ImageHeight \ 3) 
   image.AddEllipseToRegion(xform, rc, 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

Reference

RasterImage Class

RasterImage Members

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Help Version 20.0.2020.4.2

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies