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Resize Event

Summary
Occurs during image resize.
Syntax
C#
C++/CLI
Python
public event EventHandler<RasterImageResizeEventArgs> Resize 
public: 
event EventHandler<RasterImageResizeEventArgs^>^ Resize 
def Resize(sender,e): # sender: RasterImageResize e: RasterImageResizeEventArgs 
Event Data

The event handler receives an argument of type RasterImageResizeEventArgs containing data related to this event. The following RasterImageResizeEventArgs properties provide information specific to this event.

PropertyDescription
Buffer Gets the unmanaged buffer that holds the resized row.
BufferArray Gets the managed buffer that holds the resized row.
Bytes Gets the number of bytes in the resized row buffer.
Cancel Gets or sets a value indicating whether to abort the resize operation.
Column Gets the column offset within the row being resized.
Image Gets a reference to the image being resized.
Row Gets the number of the resized row.
Example
C#
using Leadtools; 
using Leadtools.Codecs; 
 
 
public void RasterImageResizeExample() 
{ 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_RasterImageResize.bmp"); 
 
	using (RasterCodecs codecs = new RasterCodecs()) 
	{ 
		// Load the source image 
		using (RasterImage srcImage = codecs.Load(srcFileName)) 
		{ 
			// We will resize to half the original size 
			int destWidth = srcImage.Width / 2; 
			int destHeight = srcImage.Height / 2; 
 
			// Create the destination image 
			using (RasterImage destImage = new RasterImage( 
			   RasterMemoryFlags.Conventional, 
			   destWidth, 
			   destHeight, 
			   srcImage.BitsPerPixel, 
			   srcImage.Order, 
			   srcImage.ViewPerspective, 
			   srcImage.GetPalette(), 
			   IntPtr.Zero, 
			   0)) 
			{ 
				RasterImageResize resize = new RasterImageResize(); 
 
				// Add Event Handler 
				resize.Resize += new EventHandler<RasterImageResizeEventArgs>(resize_Resize); 
 
				byte[] buffer = new byte[destImage.BytesPerLine]; 
 
				// Start the resize process 
				resize.Start( 
				   srcImage, 
				   destWidth, 
				   destHeight, 
				   srcImage.BitsPerPixel, 
				   srcImage.Order, 
				   srcImage.DitheringMethod, 
				   RasterSizeFlags.None, 
				   srcImage.GetPalette()); 
 
				destImage.Access(); 
				// get the rows for the resized image, one by one 
				for (int row = 0; row < destImage.Height; row++) 
				{ 
					resize.ResizeBuffer(row, 0, buffer, 0, destImage.BytesPerLine); 
					destImage.SetRow(row, buffer, 0, destImage.BytesPerLine); 
				} 
				destImage.Release(); 
				resize.Stop(); 
 
				// Save the destination image 
				codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 24); 
			} 
		} 
	} 
} 
 
private void resize_Resize(object sender, RasterImageResizeEventArgs e) 
{ 
	// e.Row should ALWAYS be less than e.Image.Height 
	if (e.Row >= e.Image.Height) 
	{ 
		e.Cancel = true; // abort the resize 
		return; 
	} 
 
	byte[] buffer = new byte[e.Bytes]; 
	e.Image.Access(); 
	e.Image.GetRowColumn(e.Row, e.Column, buffer, 0, e.Bytes); 
	e.Image.Release(); 
	Marshal.Copy(buffer, 0, e.Buffer, e.Bytes); 
	Console.WriteLine("{0}, {1}", e.Row, e.Column); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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Leadtools Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.