ImageTransform Property

Summary

Current transformation matrix used for displaying the image (single item mode).

Syntax

C++/CLI

public virtual LeadMatrix ImageTransform { get; }

public:  
   virtual property LeadMatrix^ ImageTransform 
   { 
      LeadMatrix^ get() 
   }

Property Value

The current transformation matrix used for displaying the image (single item mode).

Remarks

This is a helper property for applications that use ImageViewer in single item mode. It is a shortcut to GetItemImageTransform using ActiveItem. For more information, refer to Image Viewer in Single Item Mode.

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

Introduction

Getting Started

Namespaces

Leadtools.Controls Namespace

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