Txgy.EWS.Client/Txgy.Controls/CircularProgressBar.xaml.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Txgy.Controls
{
    /// <summary>
    /// UserControl1.xaml 的交互逻辑
    /// </summary>
    public partial class CircularProgressBar : UserControl
    {
        public double Value
        {
            get { return (double)GetValue(ValueProperty); }
            set { SetValue(ValueProperty, value); }
        }
        public static readonly DependencyProperty ValueProperty =
            DependencyProperty.Register("Value", typeof(double), typeof(CircularProgressBar), new PropertyMetadata(0.0, new PropertyChangedCallback(OnPropertyChanged)));

        public Brush BackColor
        {
            get { return (Brush)GetValue(BackColorProperty); }
            set { SetValue(BackColorProperty, value); }
        }
        public static readonly DependencyProperty BackColorProperty =
            DependencyProperty.Register("BackColor", typeof(Brush), typeof(CircularProgressBar), new PropertyMetadata(Brushes.LightGray));

        public Brush ForeColor
        {
            get { return (Brush)GetValue(ForeColorProperty); }
            set { SetValue(ForeColorProperty, value); }
        }
        public static readonly DependencyProperty ForeColorProperty =
            DependencyProperty.Register("ForeColor", typeof(Brush), typeof(CircularProgressBar), new PropertyMetadata(Brushes.Orange));



        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            (d as CircularProgressBar).UpdateValue();
        }

        public CircularProgressBar()
        {
            InitializeComponent();

            this.SizeChanged += CircularProgressBar_SizeChanged;
        }

        private void CircularProgressBar_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            this.UpdateValue();
        }

        private void UpdateValue()
        {
            this.layout.Width = Math.Min(this.RenderSize.Width, this.RenderSize.Height);
            this.layout.Height = Math.Min(this.RenderSize.Width, this.RenderSize.Height);
            double radius = Math.Min(this.RenderSize.Width, this.RenderSize.Height) / 2;
            if (radius <= 0) return;

            double newX = 0.0, newY = 0.0;
            newX = radius + (radius-3) * Math.Cos((this.Value % 100.0 * 3.6 - 90) * Math.PI / 180);
            newY = radius + (radius - 3) * Math.Sin((this.Value % 100.0 * 3.6 - 90) * Math.PI / 180);

            string pathDataStr = "M{0} 3A{3} {3} 0 {4} 1 {1} {2}";
            pathDataStr = string.Format(pathDataStr, 
                radius + 0.01, 
                newX , 
                newY, 
                radius - 3, 
                this.Value < 50 ? 0 : 1);
            var converter = TypeDescriptor.GetConverter(typeof(Geometry));
            this.path.Data = (Geometry)converter.ConvertFrom(pathDataStr);

        }
    }
}