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

Java

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:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.ArrayList; 
import java.util.List; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.core.*; 
import leadtools.svg.*; 
import leadtools.imageprocessing.CloneCommand; 
import leadtools.imageprocessing.FillCommand; 
import leadtools.imageprocessing.FlipCommand; 
import leadtools.imageprocessing.GrayscaleCommand; 
import leadtools.imageprocessing.color.InvertCommand; 
import leadtools.imageprocessing.color.PosterizeCommand; 
 
 
public void regionExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1.cmp"); 
   String destFileName1 = combine(LEAD_VARS_IMAGES_DIR, "Image1_InvertRegion.bmp"); 
   String destFileName2 = combine(LEAD_VARS_IMAGES_DIR, "Image1_InvertNoRegion.bmp"); 
 
   // Load the image 
   RasterImage image = codecs.load(srcFileName); 
 
   // The image should have no region 
   System.out.printf("After loading, HasRegion = %s%n", image.hasRegion()); 
   assertTrue(!image.hasRegion()); 
 
   // Add a region to the image 
   LeadRect rc = new LeadRect(0, 0, image.getWidth() / 4, image.getHeight() / 4); 
   image.addEllipseToRegion(null, rc, RasterRegionCombineMode.SET); 
 
   // The image should have a region now 
   System.out.printf("After AddEllipseToRegion, HasRegion = %s%n", image.hasRegion()); 
   assertTrue(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); 
 
   assertTrue("file unsuccessfully saved to " + destFileName1, (new File(destFileName1)).exists()); 
   System.out.printf("File saved successfully to %s%n", destFileName1); 
 
   // Get rid of the region 
   image.makeRegionEmpty(); 
 
   // The image should not have a region now 
   System.out.printf("After MakeRegionEmpty, HasRegion = %s%n", image.hasRegion()); 
   assertTrue(!image.hasRegion()); 
 
   // Invert again and save it 
   command.run(image); 
   codecs.save(image, destFileName2, RasterImageFormat.BMP, 24); 
 
   assertTrue("file unsuccessfully saved to " + destFileName2, (new File(destFileName2)).exists()); 
   System.out.printf("File saved successfully to %s%n", destFileName2); 
 
   // Clean up 
   image.dispose(); 
   codecs.dispose(); 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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Help Version 23.0.2024.2.29

Leadtools Assembly

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

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