（三）WPF使用 Polyline 元素动态绘制折线（添加背景单元格）

前端代码

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.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;
using System.Windows.Threading;

namespace 使用_Polyline_元素来绘制折线
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        private int currentSecond = 0;
        private double xGrap = 20;//x坐标的间隔
        private int xPagePoint = 20;//每一页要显示多少个数据点
        Random rd = new Random();
        private DispatcherTimer dispatcherTimer = new DispatcherTimer();
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
          &n