MagnifyGlassEffect Class

Summary

Creates an effect that can be used to zoom in on a portion of an image with options to specify size, shape and color of the magnify glass and crosshairs.

Syntax

C++

public class MagnifyGlassEffect : ShaderEffect

  
Public Class MagnifyGlassEffect  
   Inherits System.Windows.Media.Effects.ShaderEffect 
   Implements System.Windows.Media.Animation.IAnimatable

public ref class MagnifyGlassEffect : public System.Windows.Media.Effects.ShaderEffect, System.Windows.Media.Animation.IAnimatable

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.Windows.Controls; 
using Leadtools.Windows.Media; 
using Leadtools.Windows.Media.Effects; 
 
class MagnifyGlassEffectExampleWindow : Window 
{ 
   private ImageViewer theViewer; 
 
   public MagnifyGlassEffectExampleWindow() 
   { 
      StackPanel sp = new StackPanel(); 
      Content = sp; 
 
      theViewer = new ImageViewer(); 
 
      theViewer.HorizontalAlignment = HorizontalAlignment.Center; 
      theViewer.VerticalAlignment = VerticalAlignment.Top; 
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left; 
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top; 
 
      sp.Children.Add(theViewer); 
 
      // Load an image into the viewer 
      theViewer.Source = new BitmapImage(new Uri(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg"))); 
 
      Title = "MagnifyGlassEffect - Click and and move the mouse cursor on the image to see the effect"; 
 
      theViewer.PreviewMouseDown += new MouseButtonEventHandler(theViewer_PreviewMouseDown); 
      theViewer.MouseMove += new MouseEventHandler(theViewer_MouseMove); 
      theViewer.MouseUp += new MouseButtonEventHandler(theViewer_MouseUp); 
   } 
 
   private void theViewer_PreviewMouseDown(object sender, MouseButtonEventArgs e) 
   { 
      MagnifyGlassEffect effect = new MagnifyGlassEffect(); 
 
      Point pos = e.GetPosition(theViewer); 
 
      BitmapSource source = theViewer.Source as BitmapSource; 
      if (source != null) 
      { 
         effect.Center = new Point( 
            (1.0 * pos.X) / source.PixelWidth, 
            (1.0 * pos.Y) / source.PixelHeight); 
 
         effect.Radius = 0.25; 
         effect.AspectRatio = 1.0; 
         effect.ScaleFactor = 2.0; 
         effect.Color = Colors.Blue; 
         effect.Border = 1; 
         effect.CrossHairs = 1; 
         theViewer.ImageEffect = effect; 
      } 
   } 
 
   private void theViewer_MouseMove(object sender, MouseEventArgs e) 
   { 
      MagnifyGlassEffect effect = theViewer.ImageEffect as MagnifyGlassEffect; 
      if (effect != null) 
      { 
         Point pos = e.GetPosition(theViewer); 
 
         BitmapSource source = theViewer.Source as BitmapSource; 
         if (source != null) 
         { 
            effect.Center = new Point( 
               (1.0 * pos.X) / source.PixelWidth, 
               (1.0 * pos.Y) / source.PixelHeight); 
         } 
      } 
   } 
 
   private void theViewer_MouseUp(object sender, MouseButtonEventArgs e) 
   { 
      if (theViewer.ImageEffect != null) 
      { 
         theViewer.ImageEffect = null; 
      } 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.Windows.Controls 
Imports Leadtools.Windows.Media 
Imports Leadtools.Windows.Media.Effects 
 
Class MagnifyGlassEffectExampleWindow 
   Inherits Window 
   Private theViewer As ImageViewer 
 
   Public Sub New() 
      Dim sp As New StackPanel() 
      Content = sp 
 
      theViewer = New ImageViewer() 
 
      theViewer.HorizontalAlignment = HorizontalAlignment.Center 
      theViewer.VerticalAlignment = VerticalAlignment.Top 
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left 
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top 
 
      sp.Children.Add(theViewer) 
 
      ' Load an image into the viewer 
      theViewer.Source = New BitmapImage(New Uri(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg"))) 
 
      Title = "MagnifyGlassEffect - Click and and move the mouse cursor on the image to see the effect" 
 
      AddHandler theViewer.PreviewMouseDown, AddressOf theViewer_PreviewMouseDown 
      AddHandler theViewer.MouseMove, AddressOf theViewer_MouseMove 
      AddHandler theViewer.MouseUp, AddressOf theViewer_MouseUp 
   End Sub 
 
   Private Sub theViewer_PreviewMouseDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs) 
      Dim effect As New MagnifyGlassEffect() 
 
      Dim pos As Point = e.GetPosition(theViewer) 
 
      Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource) 
      If Not source Is Nothing Then 
         effect.Center = New Point( 
            (1.0 * pos.X) / source.PixelWidth, 
            (1.0 * pos.Y) / source.PixelHeight) 
 
         effect.Radius = 0.25 
         effect.AspectRatio = 1.0 
         effect.ScaleFactor = 2.0 
         effect.Color = Colors.Blue 
         effect.Border = 1 
         effect.CrossHairs = 1 
         theViewer.ImageEffect = effect 
      End If 
   End Sub 
 
   Private Sub theViewer_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) 
      Dim effect As MagnifyGlassEffect = DirectCast(theViewer.ImageEffect, MagnifyGlassEffect) 
      If Not effect Is Nothing Then 
         Dim pos As Point = e.GetPosition(theViewer) 
 
         Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource) 
         If Not source Is Nothing Then 
            effect.Center = New Point( 
               (1.0 * pos.X) / source.PixelWidth, 
               (1.0 * pos.Y) / source.PixelHeight) 
         End If 
      End If 
   End Sub 
 
   Private Sub theViewer_MouseUp(ByVal sender As Object, ByVal e As MouseButtonEventArgs) 
      If Not theViewer.ImageEffect Is Nothing Then 
         theViewer.ImageEffect = Nothing 
      End If 
   End Sub 
End Class 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

MagnifyGlassEffect Members

Leadtools.Windows.Media.Effects Namespace

Introduction

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Help Version 21.0.2021.6.30

Leadtools.Windows.Media.Effects Assembly

Introduction

Getting Started

Namespaces

Leadtools.Windows.Media.Effects Namespace

Assemblies