Polygon绘制多边形 - (二十五)

运行效果如下：

MainWindow.xaml 代码如下：

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="350">
    <Grid>
        <Polygon Margin="2"
            Fill="Red" Stroke="Black" StrokeThickness="0"
            StrokeLineJoin="Round" Width="300" Height="300"
            Stretch="Fill"
            Points="9,2 11,7 17,7 12,10 14,15 9,12 4,15 6,10 1,7 7,7"
            Name="Star"/>
    </Grid>
</Window>

MainWindow.xaml.cs 代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Threading;
using System.Windows;
using System.Windows.Data;
using System.Windows.Shapes;

namespace WpfApp
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public static GlobalVariable GlobalVariables { get; set; } = new GlobalVariable();
        public MainWindow()
        {
            InitializeComponent();

            // 绑定库
            Star.SetBinding(Polygon.FillProperty, new Binding() { Source = GlobalVariables, Path = new PropertyPath("MyStar") });
            // 启动线程
            new Thread(ThreadLog) { IsBackground = true }.Start();
        }

        private void ThreadLog()
        {
            List<string> colors = new List<string>() { "Black", "Yellow", "DarkOrange", "SpringGreen", "Blue" };

            while (true)
            {
                foreach (string color in colors)
                {
                    GlobalVariables.MyStar = color;
                    Thread.Sleep(1000);
                }
            }
        }
    }
    public class GlobalVariable : ModelBase
    {
        private string _MyStar;

        /// <summary>
        /// MyStar背景色
        /// </summary> 
        public string MyStar
        {
            set
            {
                _MyStar = value;
                this.OnPropertyChanged("MyStar");
            }
            get { return _MyStar; }
        }
    }

    [Serializable]
    public abstract class ModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            if (propertyName != null)
            {
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}

MainWindow.xaml.cs 简化代码：

using System;
using System.Collections.Generic;
using System.Threading;
using System.Windows;
using System.Windows.Media;

namespace WpfApp
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            // 启动线程
            new Thread(ThreadLog) { IsBackground = true }.Start();
        }
        private void ThreadLog()
        {
            List<Brush> colors = new List<Brush>() { Brushes.Black, Brushes.Yellow, Brushes.DarkOrange, Brushes.SpringGreen, Brushes.Blue };

            while (true)
            {
                foreach (Brush color in colors)
                {
                    Application.Current.Dispatcher.BeginInvoke((Action)delegate ()
                    {
                        Star.Fill = color;
                    });
                    Thread.Sleep(1000);
                }
            }
        }
    }
}