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GetItemContentTransform Method

Summary

Transformation matrix of the content of an item.

Syntax
C#
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
C#
using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
 
public void ImageViewerItemTransform_Example(int dy, LeadPoint position) 
{ 
   double total = _imageViewer.GetItemViewBounds(_imageViewer.ActiveItem, ImageViewerItemPart.Item, false).Height; 
   double factor; 
 
   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); 
 
   var transform = LeadMatrix.Identity; 
   transform.ScaleAt(1 / factor, 1 / factor, origin.X, origin.Y); 
   _imageViewer.ActiveItem.Transform = LeadMatrix.Multiply(_imageViewer.ActiveItem.Transform, transform); 
} 
Requirements

Target Platforms

Help Version 22.0.2023.1.24
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Leadtools.Controls Assembly
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.