Dashboard.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Animation;
using System.Windows.Media;
using System.Windows.Shapes;
using Microsoft.Expression.Shapes;

namespace DashboardDemo
{
    public class Dashboard : System.Windows.Controls.Control
    {
        public const string ArcName = "arckd";
        public const string ValueTxtName = "valueTxt";
        public const string CanvasName = "canvasPlate";
        public const string ZZRotateName = "rtPointer";

        private static double StartAngle = -135.5;

        static Dashboard()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(Dashboard), new FrameworkPropertyMetadata(typeof(Dashboard)));
        }

        Arc arckd;
        TextBlock valueTxt;
        Canvas canvasPlate;
        RotateTransform rtPointer;
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            if (arckd == null)
                arckd = GetTemplateChild(ArcName) as Arc;
            if (valueTxt == null)
                valueTxt = GetTemplateChild(ValueTxtName) as TextBlock;
            if (canvasPlate == null)
                canvasPlate = GetTemplateChild(CanvasName) as Canvas;
            if (rtPointer == null)
                rtPointer = GetTemplateChild(ZZRotateName) as RotateTransform;
            DrawScale();
            DrawAngle();
            arckd.EndAngle = StartAngle + (-StartAngle * 2d) * ((double)Value / Maximum);
            valueTxt.Text = Value.ToString();
        }
        public double Value
        {
            get { return (double)GetValue(ValueProperty); }
            set
            {
                SetValue(ValueProperty, value);
            }
        }
        public static readonly DependencyProperty ValueProperty =
            DependencyProperty.Register("Value", typeof(double), typeof(Dashboard),
                new PropertyMetadata(default(double), new PropertyChangedCallback(OnValuePropertyChanged)));
        public double Minimum