Add a Magnifying Glass Using Expression Blend

Take the following steps to create and run a program in Microsoft Expression Blend to add a magnifying glass using LEADTOOLS ImageViewer.

  1. Using Microsoft Expression Blend, open a project that includes an Image Viewer. If you wish, you can open the project you created in the tutorials on Displaying an Image or Linking an Image List to an Image Viewer.
  2. Open the XAML file and select the ImageViewer control you wish to add the magnify glass interactive mode to and modify its code to look like below:

    MainWindow.xaml
          <Leadtools_Controls_Wpf:ImageViewer x:Name="_imageViewer" Margin="220,10,10,10" ViewHorizontalAlignment="Center" ViewVerticalAlignment="Center"> 
             <Leadtools_Controls_Wpf:ImageViewer.InteractiveModes> 
                <Leadtools_Controls_Wpf:ImageViewerMagnifyGlassInteractiveMode Shape="Rectangle" ScaleFactor="2" IsEnabled="True"/> 
             </Leadtools_Controls_Wpf:ImageViewer.InteractiveModes> 
          </Leadtools_Controls_Wpf:ImageViewer> 

  3. Press F5 to build the application.

  4. When the window appears, left-click anywhere on the image to display the magnifying glass, and drag to change the magnified area.

MagGlass

Example

MainWindow.xaml
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:Leadtools_Controls_Wpf="clr-namespace:Leadtools.Controls;assembly=Leadtools.Controls.Wpf" 
    x:Class="MyList.MainWindow" 
    x:Name="Window" 
    Title="MyList"  
    Width="640" 
    Height="480"> 
    <Grid x:Name="LayoutRoot"> 
        <Leadtools_Controls_Wpf:ImageViewer x:Name="_imageList" Margin="10" ItemSpacing="10,10" ItemSize="150,150" HorizontalAlignment="Left" Width="180" ItemBorderThickness="1" SelectedItemBackgroundColor="LightSkyBlue" Loaded="ImageViewer_Loaded" SelectedItemsChanged="_imageList_SelectedItemsChanged"> 
            <Leadtools_Controls_Wpf:ImageViewer.ViewLayout> 
                <Leadtools_Controls_Wpf:ImageViewerVerticalViewLayout Columns="1"/> 
            </Leadtools_Controls_Wpf:ImageViewer.ViewLayout> 
 
            <Leadtools_Controls_Wpf:ImageViewer.InteractiveModes> 
                <Leadtools_Controls_Wpf:ImageViewerSelectItemsInteractiveMode IsEnabled="True"/> 
            </Leadtools_Controls_Wpf:ImageViewer.InteractiveModes> 
        </Leadtools_Controls_Wpf:ImageViewer> 
 
      <Leadtools_Controls_Wpf:ImageViewer x:Name="_imageViewer" Margin="220,10,10,10" ViewHorizontalAlignment="Center" ViewVerticalAlignment="Center"> 
         <Leadtools_Controls_Wpf:ImageViewer.InteractiveModes> 
            <Leadtools_Controls_Wpf:ImageViewerMagnifyGlassInteractiveMode Shape="Rectangle" ScaleFactor="2" IsEnabled="True"/> 
         </Leadtools_Controls_Wpf:ImageViewer.InteractiveModes> 
      </Leadtools_Controls_Wpf:ImageViewer> 
   </Grid> 
</Window>             
MainWindow.xaml.cs
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Controls; 
using System.IO; 
using System.Windows; 
 
namespace MyList 
{ 
   /// <summary> 
   /// Interaction logic for MainWindow.xaml 
   /// </summary> 
   public partial class MainWindow : Window 
   { 
      public MainWindow() 
      { 
         InitializeComponent(); 
      } 
 
      static class LEAD_VARS 
      { 
         public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
      } 
 
      LeadSize _imageSize = LeadSize.Create(130, 130); 
 
      private void ImageViewer_Loaded(object sender, RoutedEventArgs e) 
      { 
         AddItem(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\NaturalFruits.jpg")); 
         AddItem(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Ani.gif")); 
         AddItem(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Image2.jpg")); 
         AddItem(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Fruits.jpg")); 
 
         _imageViewer.Zoom(ControlSizeMode.Fit, 1.0, _imageViewer.DefaultZoomOrigin); 
      } 
 
      private void AddItem(string fileName) 
      { 
         using (RasterCodecs codecs = new RasterCodecs()) 
         { 
            _imageList.BeginUpdate(); 
 
            RasterImage rasterImage = codecs.Load(fileName); 
 
            LeadRect destRect = LeadRect.Create(0, 0, _imageSize.Width, _imageSize.Height); 
            LeadRect imageRect = ImageViewer.GetDestinationRectangle( 
               rasterImage.ImageWidth, 
               rasterImage.ImageHeight, 
               destRect, 
               ControlSizeMode.Fit, 
               ControlAlignment.Near, 
               ControlAlignment.Near); 
 
            RasterImage thumbnail = rasterImage.CreateThumbnail( 
               imageRect.Width, 
               imageRect.Height, 
               32, 
               RasterViewPerspective.TopLeft, 
               RasterSizeFlags.Resample); 
 
            ImageViewerItem item = new ImageViewerItem(); 
            item.Image = thumbnail; 
            item.Tag = fileName; 
 
            _imageList.Items.Add(item); 
 
            _imageList.EndUpdate(); 
         } 
      } 
 
      private void _imageList_SelectedItemsChanged(object sender, System.EventArgs e) 
      { 
         if (_imageList.Items.GetSelected().Length == 0) return; 
 
         ImageViewerItem selectedItem = _imageList.Items.GetSelected()[0]; 
         if (selectedItem != null && selectedItem.Tag != null) 
         { 
            string originalImageName = selectedItem.Tag as string; 
            using (RasterCodecs codecs = new RasterCodecs()) 
            { 
               _imageViewer.Image = codecs.Load(originalImageName); 
            } 
         }   
      } 
   } 
} 

Programming Reference

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