(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
{
    ///


    /// MainWindow.xaml 的交互逻辑
    ///

    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)
        {
            dispatcherTimer.Interval = TimeSpan.FromMilliseconds(100);//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
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            currentSecond++;
            double x = currentSecond * xGrap;
            double y = rd.Next(1,200);
                    
            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的代码如下:

        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="450" Width="800">
   
       
           

                            Stroke="Red"
            StrokeThickness="1" />
           
       
       

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