MakeRegionEmpty Method

Summary

Removes the region from the image and frees the memory used for the region.

Syntax

Objective-C

C++/CLI

Java

Python

public void MakeRegionEmpty()

- (void)makeRegionEmpty

public void makeRegionEmpty();

public: 
void MakeRegionEmpty();

def MakeRegionEmpty(self):

Example

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 RegionExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_InvertRegion.bmp"); 
	string destFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_InvertNoRegion.bmp"); 
 
	// Load the image 
	RasterImage image = codecs.Load(srcFileName); 
 
	// The image should have no region 
	Console.WriteLine("After loading, HasRegion = {0}", image.HasRegion); 
	Assert.IsTrue(!image.HasRegion); 
 
	// Add a region to the image 
	LeadRect rc = new LeadRect(0, 0, image.Width / 4, image.Height / 4); 
	image.AddEllipseToRegion(null, rc, RasterRegionCombineMode.Set); 
 
	// The image should have a region now 
	Console.WriteLine("After AddEllipseToRegion, HasRegion = {0}", image.HasRegion); 
	Assert.IsTrue(image.HasRegion); 
 
	// Invert this image and save it to a file 
	InvertCommand command = new InvertCommand(); 
	command.Run(image); 
	codecs.Save(image, destFileName1, RasterImageFormat.Bmp, 24); 
 
	// Get rid of the region 
	image.MakeRegionEmpty(); 
 
	// The image should not have a region now 
	Console.WriteLine("After MakeRegionEmpty, HasRegion = {0}", image.HasRegion); 
	Assert.IsTrue(!image.HasRegion); 
 
	// Invert again and save it 
	command.Run(image); 
	codecs.Save(image, destFileName2, 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