Magnifying Glass Effect in Silverlight

In this article I am going to show how we can magnify an image. By magnifying mean we can zoom a particular part of an image.

This is the xaml code

<UserControl x:Class="MagnifyingGlassEffect.MainPage"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

    mc:Ignorable="d"

    d:DesignHeight="350" d:DesignWidth="450">

    <Canvas x:Name="LayoutRoot" Background="White">

        <Image x:Name="ImageToMagnify" Width="320" Height="240" Source="Earth.jpg" MouseMove="ImageToMagnify_MouseMove"

               MouseLeftButtonDown="ImageToMagnify_MouseLeftButtonDown" MouseLeftButtonUp="ImageToMagnify_MouseLeftButtonUp" />

        <Image x:Name="glass" Width="320" Height="240" Visibility="Collapsed" Source="Earth.jpg" IsHitTestVisible="False">

            <Image.RenderTransform>

                <ScaleTransform ScaleX="2" ScaleY="2"/>

            </Image.RenderTransform>

            <Image.Clip>

                <EllipseGeometry x:Name="geometry" RadiusX="40" RadiusY="40" />

            </Image.Clip>

        </Image>

    </Canvas>

</UserControl>

 

This is my xaml.cs code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

 

namespace MagnifyingGlassEffect

{

    public partial class MainPage : UserControl

    {

        public MainPage()

        {

            InitializeComponent();

        }

        private void ImageToMagnify_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)

        {

            glass.Visibility = Visibility.Visible;

            UpdateGlassPosition(e.GetPosition(ImageToMagnify));

        }

 

        private void ImageToMagnify_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)

        {

            glass.Visibility = Visibility.Collapsed;

        }

 

        private void ImageToMagnify_MouseMove(object sender, MouseEventArgs e)

        {

            UpdateGlassPosition(e.GetPosition(ImageToMagnify));

        }

 

        private void UpdateGlassPosition(Point position)

        {

            geometry.Center = new Point(position.X, position.Y);

            glass.SetValue(Canvas.LeftProperty, -position.X);

            glass.SetValue(Canvas.TopProperty, -position.Y);

        }

    }

}

 

When run the application then

Image 1.

When we magnify this image

 

Image 2.

 

Image 3.