WPF編程，Live Charts使用說明（21）——儀表圖

後臺

using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
 
namespace Wpf.Gauges
{
 
    public partial class AngularGaugeExmple : UserControl, INotifyPropertyChanged
    {
        private double _value;
 
        public AngularGaugeExmple()
        {
            InitializeComponent();
 
            Value = 160;
 
            DataContext = this;
        }
 
        public double Value
        {
            get { return _value; }
            set
            {
                _value = value;
                OnPropertyChanged("Value");
            }
        }
 
        private void ChangeValueOnClick(object sender, RoutedEventArgs e)
        {
            Value = new Random().Next(50, 250);
        }
 
        public event PropertyChangedEventHandler PropertyChanged;
 
        protected virtual void OnPropertyChanged(string propertyName = null)
        {
            if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

前臺

<UserControl x:Class="Wpf.Gauges.AngularGaugeExmple"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Wpf.Gauges"
             xmlns:lvc="clr-namespace:LiveCharts.Wpf;assembly=LiveCharts.Wpf"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300" d:DataContext="{d:DesignInstance local:AngularGaugeExmple}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <Button Margin="10" Click="ChangeValueOnClick">Update</Button>
        <lvc:AngularGauge Grid.Row="1" Value="{Binding Value}" FromValue="50" ToValue="250" 
                          LabelsStep="50" TicksStep="25" Wedge="300"
                          TicksForeground="White" Foreground="White" 
                          FontWeight="Bold" FontSize="16"
                          SectionsInnerRadius=".5">
            <lvc:AngularGauge.Sections>
                <lvc:AngularSection FromValue="50" ToValue="200" Fill="#F8A725"/>
                <lvc:AngularSection FromValue="200" ToValue="250" Fill="#FF3939"/>
            </lvc:AngularGauge.Sections>
        </lvc:AngularGauge>
    </Grid>
</UserControl>