AddEllipseToRegion Method

Summary

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

Syntax

Objective-C

C++/CLI

Java

Python

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

- (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 
)

def AddEllipseToRegion(self,xform,rc,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 Leadtools.Svg; 
 
 
public void AddEllipseToRegionExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "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(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies