（四）WPF使用 Polyline 元素动态绘制折线 （添加X轴时间标签）

前端代码MainWindow.xaml.cs代码如下：

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
{
    ///

    /// MainWindow.xaml 的交互逻辑
    ///

    public partial class MainWindow : Window
    {
        private int currentSecond = 0;
        private double xGrap = 100;//x坐标的间隔
        private int xPagePoint = 5;//每一页要显示多少个数据点
        Random rd = new Random();
        private DispatcherTimer dispatcherTimer = new DispatcherTimer();

        //TextBlock[] myTextBlock = new TextBlock[5];//创建5个X轴的文本
        TextBlock myTextBlock1 = new TextBlock();
        TextBlock myTextBlock2 = new TextBlock();
        TextBlock myTextBlock3 = new TextBlock();
        TextBlock myTextBlock4= new TextBlock();
        TextBlock myTextBlock5 = new TextBlock();
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            dispatcherTimer.Interval = TimeSpan.FromMilliseconds(1000);//1秒钟产生一次中断
            dispatcherTimer.Tick += timer_Tick;//中断入口函数
            dispatcherTimer.IsEnabled = true;//开启中断

            
            //myTextBlock.FontSize = 18;
            //myTextBlock.FontWeight = FontWeights.Bold;
            //myTextBlock.FontStyle = FontStyles.Italic;

            //myTextBlock1.Text = "0";
            //myTextBlock2.Text = "0";
            //myTextBlock3.Text = "0";
            //myTextBlock4.Text = "0";
            //myTextBlock5.Text = "0";
            myTextBlock1.Margin = new Thickness(10 + xGrap*1 - 20, 220, 0, 0);
            myTextBlock2.Margin = new Thickness(10 + xGrap*2 - 20, 220, 0, 0);
            myTextBlock3.Margin = new Thickness(10 + xGrap*3 - 20, 220, 0, 0);
            myTextBlock4.Margin = new Thickness(10 + xGrap*4 - 20, 220, 0, 0);
            myTextBlock5.Margin = new Thickness(10 + xGrap*5 - 20, 220, 0, 0);
            _myGrid.Children.Add(myTextBlock1);
            _myGrid.Children.Add(myTextBlock2);
            _myGrid.Children.Add(myTextBlock3);
            _myGrid.Children.Add(myTextBlock4);
            _myGrid.Children.Add(myTextBlock5);
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            DateTime _cur_date = DateTime.Now; ;
            DateTime date1;
            currentSecond++;
            double x = currentSecond * xGrap;
            double y = rd.Next(1,200);

            //myTextBlock1.Text = (currentSecond-5).ToString();
            //myTextBlock2.Text = (currentSecond-4).ToString();
            //myTextBlock3.Text = (currentSecond-3).ToString();
            //myTextBlock4.Text = (currentSecond-2).ToString();
            //myTextBlock5.Text = (currentSecond-1).ToString();

            //myTextBlock1.Text = date1.ToString("yyyy/MM/dd HH:mm:ss");;
            date1 = _cur_date.AddSeconds(-5);
            myTextBlock1.Text = date1.ToString("HH:mm:ss");

            date1 = _cur_date.AddSeconds(-4);
            myTextBlock2.Text = date1.ToString("HH:mm:ss");

            date1 = _cur_date.AddSeconds(-3);
            myTextBlock3.Text = date1.ToString("HH:mm:ss");

            date1 = _cur_date.AddSeconds(-2);
            myTextBlock4.Text = date1.ToString("HH:mm:ss");

            date1 = _cur_date.AddSeconds(-1);
            myTextBlock5.Text = date1.ToString("HH:mm:ss");

            var point = new Point(x, y);
            _myPolyline.Points.Add(point);//添加新的数据点

            if (currentSecond > xPagePoint)
            {
                _myPolyline.Points.RemoveAt(0);
                _myCanvas.Margin = new Thickness(-1*(xGrap * currentSecond)+ xPagePoint * xGrap, 0, 0, 0);
            }
        }
    }
}
MainWindow.xaml代码如下：

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:使用_Polyline_元素来绘制折线"
        mc:Ignorable="d"
        Title="MainWindow" Height="413.672" Width="800">
   
       
           
               
           
       
       
   

App.xaml的代码如下：

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:使用_Polyline_元素来绘制折线"
             StartupUri="MainWindow.xaml">