Describes a region of interest in a RasterImage object.
public class RasterRegion : IDisposable
Public Class RasterRegion
Implements System.IDisposable
public sealed class RasterRegion : IClosable
@interface LTRasterRegion : NSObject
public class RasterRegion
function Leadtools.RasterRegion()
public ref class RasterRegion : public System.IDisposable
The RasterImage object contains a region of interest value that can be used to limit the portion available for updating when using the image processing command. The region can be set using a geometric shape such as RasterImage.AddRectangleToRegion and RasterImage.AddEllipseToRegion or with image data attributes such as RasterImage.AddColorToRegion and RasterImage.AddMaskToRegion.
At any point, you can get a copy of the region inside a RasterImage object using the RasterImage.GetRegion method and update the region inside an image using the RasterImage.SetRegion method.
The RasterRegion class provides a platform independent representation of a region of interest in an image that can be used in any platform supported by LEADTOOLS such as GDI, GDI+, WPF and Silverlight.
To convert a LEADTOOLS RasterRegion object to/from a device dependent region, you can use the following helper classes:
The RasterRegion class implements the IDisposable interface, so you must call Dispose on any region objects you create after using it.
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.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using LeadtoolsExamples.Common;
public void RasterRegionExample()
{
string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
string destFileName1 = Path.Combine(ImagesPath.Path, "Image1_WithRegion1.bmp");
string destFileName2 = Path.Combine(ImagesPath.Path, "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);
}
}
}
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Public Sub RasterRegionExample()
Dim codecs As New RasterCodecs()
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName1 As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_WithRegion1.bmp")
Dim destFileName2 As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_WithRegion2.bmp")
' Load the source image
Using image As RasterImage = codecs.Load(srcFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)
' Create a new rectangular RasterRegion
Using region As 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(Nothing, region, RasterRegionCombineMode.Set)
' Fill the image with a color and save it to disk to show the region
Dim cmd As 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(Nothing, region, RasterRegionCombineMode.Set)
cmd = New FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Red))
cmd.Run(image)
codecs.Save(image, destFileName2, RasterImageFormat.Bmp, 24)
End Using
End Using
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
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