C# Chart控件标记问题详解

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

namespace TestIC00
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }
        public int index = 0;
        public bool flag = false;
        private void button1_Click(object sender, EventArgs e)
        {
            timer1.Enabled = !timer1.Enabled;//对定时器的操作，点击打开或关闭定时器，主要是实现一秒传一个值
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            Random random = new Random();
            this.chart1.ChartAreas[0].AxisX.MajorGrid.Interval = 1;//网格间隔
            this.chart1.ChartAreas[0].AxisX.MinorGrid.Interval = 1;
            this.chart1.ChartAreas[0].AxisY.MajorGrid.Interval = 1;//网格间隔
            this.chart1.ChartAreas[0].AxisY.MinorGrid.Interval = 1;
            this.chart1.ChartAreas[0].AxisX.LabelStyle.Interval = 1;//设置X轴的值的间隔大小
            this.chart1.ChartAreas[0].AxisX.MajorGrid.LineColor = Color.Gray;//设置X轴网格线颜色
            this.chart1.ChartAreas[0].AxisY.MajorGrid.LineColor = Color.Gray;//设置Y轴网格线颜色
            chart1.ChartAreas[0].AxisX.ScrollBar.Enabled = true;//启动滚动条
            this.chart1.ChartAreas[0].AxisY.LabelStyle.Enabled = false;//使Y轴的刻度隐藏
            chart1.ChartAreas[0].AxisX.ScaleView.Scroll(System.Windows.Forms.DataVisualization.Charting.ScrollType.Last);//启用视图实现数据滚动
            int value = random.Next(0, 20);//产生随机数进行赋值
            chart1.Series[0].Points.AddY(value);//对折线图添加数据
            if(flag)//判断标记，如果是true表示只标记最新，需要去掉前面的一个值
            {
                this.chart1.Series[0].Points[index].MarkerStyle = MarkerStyle.Circle;//设置标记的形状为圆形
                this.chart1.Series[0].Points[index].MarkerColor = Color.Red;//形状颜色设置
                this.chart1.Series[0].Points[index].MarkerBorderWidth = 3;//形状大小设置
                this.chart1.Series[0].Points[index].MarkerSize = 10;//设置我们展示标记的大小
                this.chart1.Series[0].Points[index].Label = "功能：" + this.chart1.Series[0].Name + "\r\n" + "值：" + value.ToString();//对标记展示的值
                this.chart1.Series[0].Points[index].IsValueShownAsLabel = true;//展示标记
                this.chart1.Series[0].Points[index-1].MarkerBorderWidth = 0;//改前一个标记的大小
                this.chart1.Series[0].Points[index - 1].MarkerSize = 0;//形状大小
                this.chart1.Series[0].Points[index - 1].Label = "";//展示数据
                this.chart1.Series[0].Points[index - 1].IsValueShownAsLabel = false;//不展示
            }
            else//对数据一直标记
            {
                this.chart1.Series[0].Points[index].MarkerStyle = MarkerStyle.Circle;
                this.chart1.Series[0].Points[index].MarkerColor = Color.Red;
                this.chart1.Series[0].Points[index].MarkerBorderWidth = 3;
                this.chart1.Series[0].Points[index].MarkerSize = 10;
                this.chart1.Series[0].Points[index].Label = "功能：" + this.chart1.Series[0].Name + "\r\n" + "值：" + value.ToString();
                this.chart1.Series[0].Points[index].IsValueShownAsLabel = true;
            }
           //也可以加一种状态是什么也不标记，你们自己对那个状态值的处理就可以啦
            index++;
        }

        private void button2_Click(object sender, EventArgs e)//只标记最新按钮
        {
            flag = !flag;//对状态值的改变，我就使用了两种状态，你们可以改
        }
    }
}