AddRectangleToRegion Method

Summary

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

Syntax

Objective-C

C++/CLI

Java

Python

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

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

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

public: 
void AddRectangleToRegion(  
   RasterRegionXForm^ xform, 
   LeadRect rc, 
   RasterRegionCombineMode combineMode 
)

def AddRectangleToRegion(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 specifies the region.

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 loads an image, adds a rectangle region to it, and runs the InvertCommand to show the affected area before saving the image back to disk.

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 AddRectangleToRegionExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_AddRectangleToRegion.bmp"); 
 
   // Load the image 
   RasterImage image = codecs.Load(srcFileName); 
 
   // Add a rectangle 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.AddRectangleToRegion(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:\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 addRectangleToRegionExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1.cmp"); 
   String destFileName = combine(LEAD_VARS_IMAGES_DIR, "Image1_AddRectangleToRegion.bmp"); 
 
   // Load the image 
   RasterImage image = codecs.load(srcFileName); 
 
   // Add a rectangle region 
   RasterRegionXForm xform = new RasterRegionXForm(); 
   xform.setRasterViewPerspective(RasterViewPerspective.TOP_LEFT); 
   xform.setXOffset(0); 
   xform.setYOffset(0); 
   xform.setXScalarDenominator(1); 
   xform.setXScalarNumerator(1); 
   xform.setYScalarDenominator(1); 
   xform.setYScalarNumerator(1); 
 
   LeadRect rc = new LeadRect(image.getImageWidth() / 4, image.getImageHeight() / 4, image.getImageWidth() / 3, 
         image.getImageHeight() / 3); 
   image.addRectangleToRegion(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); 
 
   // Clean up 
   image.dispose(); 
   codecs.dispose(); 
 
   assertTrue("file unsuccessfully saved to " + destFileName, (new File(destFileName)).exists()); 
   System.out.printf("File saved successfully to %s%n", destFileName); 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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