RasterRegion Constructor()

Summary

Initializes a new empty RasterRegion.

Syntax

Objective-C

C++/CLI

Java

Python

public RasterRegion()

- (instancetype)init

public RasterRegion();

public: 
RasterRegion();

__init__() # Default constructor

Remarks

This constructor initializes a new empty RasterRegion object. The IsEmpty property will be true and GetBounds will return an empty rectangle.

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

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
 
 
public void RasterRegionExample() 
{ 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_WithRegion1.bmp"); 
   string destFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_WithRegion2.bmp"); 
 
   using (RasterCodecs codecs = new RasterCodecs()) 
   { 
      // Load the source image 
      using (RasterImage image = codecs.Load(srcFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)) 
      { 
         // Create a new rectangular RasterRegion 
         using (RasterRegion region = new RasterRegion(new LeadRect(20, 30, 100, 200))) 
         { 
            // Show this region properties 
            Console.WriteLine("IsEmpty: {0}\nBounds: {1}", region.IsEmpty, region.GetBounds()); 
 
            // Set it into the image 
            image.SetRegion(null, region, RasterRegionCombineMode.Set); 
 
            // Fill the image with a color and save it to disk to show the region 
            FillCommand cmd = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Yellow)); 
            cmd.Run(image); 
 
            codecs.Save(image, destFileName1, RasterImageFormat.Bmp, 24); 
 
            // Clear this region 
            region.MakeEmpty(); 
 
            // Show its properties 
            Console.WriteLine("IsEmpty: {0}\nBounds: {1}", region.IsEmpty, region.GetBounds()); 
 
            // Set it into the image and fill again with red, notice 
            // that this will fill the whole image since 
            // the region is now empty 
            image.SetRegion(null, region, RasterRegionCombineMode.Set); 
 
            cmd = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Red)); 
            cmd.Run(image); 
 
            codecs.Save(image, destFileName2, RasterImageFormat.Bmp, 24); 
         } 
      } 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterRegion Class

RasterRegion Members

Overload List

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Help Version 22.0.2023.5.16

Leadtools Assembly

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Getting Started

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

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