How to use Slider to scale a Line in WPF using VB.NET

Introduction

Here in this article I am explaining that how we can use slider to scale a line. To scale a line through slider we will use a StackPanel and Canvas. Then we will set the height and width of the StackPanel's border and canvas. We will also use TransformGroup, Line and a Slider control and  set the ScaleTransform, X-Y coordinates, stroke and StrokeThickNess of the Line and lastly we will bind the x-y scale of the Line to the Slider.
 
Getting Started

• Simply create a new WPF application 
• Drag a StackPanel,Canvas,Line and a slider on MainWindow. Your window will look like below.
  
  
   
• After adding all the controls your MainWindow.xaml page will look below.
  
  <Window x:Class="MainWindow"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Title="MainWindow" Height="318" Width="333">
      <StackPanel Height="280" Width="250">
          <Border BorderBrush="SteelBlue"   BorderThickness="1" Height="200"
        Width="200" Margin="20">
              <Canvas Height="200" Width="200">
                  <Canvas.RenderTransform>
                      <TransformGroup>
                          <ScaleTransform ScaleY="-1" />
                          <TranslateTransform Y="200" />
                      </TransformGroup>
                  </Canvas.RenderTransform>
                  <Line X1="0" Y1="0" X2="80" Y2="80" Stroke="MediumVioletRed"
            StrokeThickness="2">
                      <Line.RenderTransform>
                          <ScaleTransform
                ScaleX="{Binding ElementName=slider,Path=Value}"
                ScaleY="{Binding ElementName=slider,Path=Value}" />
                      </Line.RenderTransform>
                  </Line>
              </Canvas>
          </Border>
          <Slider Name="slider" Minimum="0" Maximum="3" Value="1"
        TickPlacement="BottomRight" TickFrequency="0.2"
        IsSnapToTickEnabled="True" />
      </StackPanel>
  </Window>
   
• Now run your application.