GetItemContentTransform Method

Summary

Transformation matrix of the content of an item.

Syntax

C++/CLI

public LeadMatrix GetItemContentTransform( 
   ImageViewerItem item 
)

public:  
   LeadMatrix^ GetItemContentTransform( 
      ImageViewerItem^ item 
   )

Parameters

item

The reference item, this value cannot be null.

Return Value

The transformation matrix of the content of an item.

Remarks

GetItemContentTransform returns the transformation used to render the content of an item in relation to the top-left corner of the viewer control.

For more information refer to Image Viewer Appearance, Image Viewer Transformation, and Image Viewer Bounds and Transform.

Example

using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
 
public ImageViewerForm _form = new ImageViewerForm(); 
public ImageViewer _imageViewer; 
 
public void ImageViewerItemTransformExample() 
{ 
   // Get the Form's ImageViewer control 
   _imageViewer = _form.ImageViewer; 
 
   // Load an image 
   using (var codecs = new RasterCodecs()) 
      _imageViewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")); 
 
   int dy = 1; 
   LeadPoint position = LeadPoint.Create(0, 0); 
 
   double total = _imageViewer.GetItemViewBounds(_imageViewer.ActiveItem, ImageViewerItemPart.Item, false).Height; 
   double factor; 
 
   LeadPointD[] points = new LeadPointD[2]; 
   points[0] = LeadPointD.Create(position.X, position.Y); 
   points[1] = LeadPointD.Create(position.X * .5, position.Y * .5); 
 
   LeadRect rect = new LeadRect(position.X, position.Y, _imageViewer.Height, _imageViewer.Width); 
 
   if (total > 0) 
      factor = 1.0 - (dy * 2.0) / total; 
   else 
      factor = 1.0; 
 
   // Get the origin in image coordinate 
   var origin = _imageViewer.ConvertPoint(_imageViewer.ActiveItem, ImageViewerCoordinateType.Control, ImageViewerCoordinateType.Image, position).ToLeadPointD(); 
   // Convert it to whatever the current transform is 
   origin = _imageViewer.ActiveItem.Transform.Transform(origin); 
   Debug.WriteLine(origin.X.ToString() + " " + origin.Y.ToString()); 
 
   _imageViewer.ConvertPoints(_imageViewer.ActiveItem, ImageViewerCoordinateType.Control, ImageViewerCoordinateType.Image, points); 
   _imageViewer.ConvertRect(_imageViewer.ActiveItem, ImageViewerCoordinateType.Control, ImageViewerCoordinateType.Image, rect); 
   _imageViewer.GetItemContentTransform(_imageViewer.ActiveItem); 
   _imageViewer.GetItemImageTransform(_imageViewer.ActiveItem); 
   _imageViewer.GetItemTransform(_imageViewer.ActiveItem); 
   Debug.WriteLine(_imageViewer.ImageTransform); 
 
   var transform = LeadMatrix.Identity; 
   transform.ScaleAt(1 / factor, 1 / factor, origin.X, origin.Y); 
   _imageViewer.ActiveItem.Transform = LeadMatrix.Multiply(_imageViewer.ActiveItem.Transform, transform); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

ImageViewer Class

ImageViewer Members

Leadtools.Controls Namespace

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Help Version 23.0.2024.2.29

Leadtools.Controls Assembly

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Getting Started

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Leadtools.Controls Namespace

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