VU Meter Control in WPF

 1 <UserControl x:Class="WpfApplication1.VUMeterControl"
 2     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4     Width="20">
 5   <StackPanel Name="panel" Background="Gray">
 6     <Rectangle Margin="2" Fill="Red" Height="20"/>
 7     <Rectangle Margin="2" Fill="Red" Height="20"/>
 8     <Rectangle Margin="2" Fill="Red" Height="20"/>
 9     <Rectangle Margin="2" Fill="Yellow" Height="20"/>
10     <Rectangle Margin="2" Fill="Yellow" Height="20"/>
11     <Rectangle Margin="2" Fill="Yellow" Height="20"/>
12     <Rectangle Margin="2" Fill="Yellow" Height="20"/>
13     <Rectangle Margin="2" Fill="Yellow" Height="20"/>
14     <Rectangle Margin="2" Fill="Green" Height="20"/>
15     <Rectangle Margin="2" Fill="Green" Height="20"/>
16     <Rectangle Margin="2" Fill="Green" Height="20"/>
17     <Rectangle Margin="2" Fill="Green" Height="20"/>
18     <Rectangle Margin="2" Fill="Green" Height="20"/>
19     <Rectangle Margin="2" Fill="Green" Height="20"/>
20     <Rectangle Margin="2" Fill="Green" Height="20"/>
21   </StackPanel>
22  </UserControl>
23  

 1 using System;
 2  using System.Collections.Generic;
 3  using System.Linq;
 4  using System.Text;
 5  using System.Windows;
 6  using System.Windows.Controls;
 7  using System.Windows.Data;
 8  using System.Windows.Documents;
 9  using System.Windows.Input;
10  using System.Windows.Media;
11  using System.Windows.Media.Imaging;
12  using System.Windows.Navigation;
13  using System.Windows.Shapes;
14 
15  namespace WpfApplication1
16 {
17   /// <summary>
18   /// Interaction logic for VUMeterControl.xaml
19   /// </summary>
20    public partial class VUMeterControl  : UserControl
21   {
22     public VUMeterControl()
23     {
24       InitializeComponent();
25     }
26 
27     public int MaxValue
28     {
29       get { return (int)GetValue(MaxValueProperty); }
30       set { SetValue(MaxValueProperty, value); }
31     }
32     public static readonly DependencyProperty MaxValueProperty =
33         DependencyProperty.Register("MaxValue", typeof(int), typeof(VUMeterControl), new UIPropertyMetadata(100));
34 
35     public int Value
36     {
37       get { return (int)GetValue(ValueProperty); }
38       set { SetValue(ValueProperty, value); }
39     }
40 
41     public static readonly DependencyProperty ValueProperty =
42         DependencyProperty.Register("Value", typeof(int), typeof(VUMeterControl), new UIPropertyMetadata(0,
43           (sender, e) =>
44           {
45             VUMeterControl control = (VUMeterControl)sender;
46             int value = (int)e.NewValue;
47             for (int i = control.panel.Children.Count - 1; i >= 0; i--)
48             {
49               Rectangle rect = (Rectangle)control.panel.Children[i];
50               if (15 - i > value / (control.MaxValue / 15))
51                 rect.Visibility = Visibility.Hidden;
52               else
53                 rect.Visibility = Visibility.Visible;
54             }
55           })
56         );
57   }
58 }
59