ZedGraph制作动态更新的曲线图（用定时器）

public Form1()
  {

            ////初始化
            myPane = nodeChart.GraphPane;
             myPane.Title.Text = "节点-时间趋势图\n(Time-Values)";
            myPane.XAxis.Title.Text = "节点时间";
            myPane.YAxis.Title.Text = "节点值";

　　　　//X轴时间格式

　　      myPane.XAxis.Type = AxisType.Date;
            myPane.XAxis.Scale.Format = "HH:mm:ss";

            //myPane.XAxis.Scale.Min = 0;
            //////X轴最大30
            //myPane.XAxis.Scale.Max = 30;
            //////X轴小步长1,也就是小间隔
            //myPane.XAxis.Scale.MinorStep = 1;
            //////X轴大步长为5，也就是显示文字的大间隔
            ////myPane.XAxis.Scale.MajorStep = 5;

            //nodeChart.AxisChange();
            //nodeChart.GetChildAtPoint().
            timer1.Interval = 100;
            timer1.Enabled = true;
            timer1.Start();
            myCurve = myPane.AddCurve("curve 1", Plist, Color.Blue, SymbolType.Diamond);
            myCurve2 = myPane.AddCurve("curve 2", Plist1, Color.Red, SymbolType.Circle);
            // 设置图标的颜色和渐变色
            myPane.Chart.Fill = new Fill(Color.White,
            Color.FromArgb(255, 255, 166), 45.0F);
            //BarItem.CreateBarLabels(myPane, false, "f0");
        }

 private void timer1_Tick(object sender, EventArgs e)
        {
            timer1.Stop();
            if (timeBo)
            {

                RollingPointPairList list = new RollingPointPairList(1200);
                RollingPointPairList list1 = new RollingPointPairList(1200);

                //如果重新选择了节点号，就清空之前的趋势图曲线，并重新赋值给变量
                if (comboBoxNodeID != comboBoxItemNodeID.Text.ToString())
                {
                    myCurve.Clear();
                    myCurve2.Clear();
                    Plist.Clear();
                    Plist1.Clear();
                    comboBoxNodeID = comboBoxItemNodeID.Text.ToString();
                    nodeChart.Refresh();
                }

                List<object> objList = ListChartData();
                //X轴时间变量

                 for (int i = 0; i < objList.Count; i++)
                {
                    //double time = (double)new XDate(DateTime.Now.AddSeconds(-(100 - i)));
                    double time = (double)new XDate(DateTime.Now);
                    List<string> listStr = (List<string>)objList[i];
                    if (listStr[0] == comboBoxItemNodeID.Text)
                    {
                        if (listStr.Count > 2)
                        {
                            double value = Convert.ToDouble(listStr[1]);
                            double value1 = Convert.ToDouble(listStr[2]);
                            Plist.Add(time, value);
                            Plist1.Add(time, value1);
                        }
                        else
                        {
                            double value = Convert.ToDouble(listStr[1]);
                            Plist.Add(time, value);
                            //MessageBox.Show("a");
                        }

　　　　　　　　　　//刷新
                        nodeChart.Refresh();
                    }
                }
                ////立方形
                //BarItem myCurve = myPane.AddBar("curve 1", Plist, Color.Blue);
                //BarItem myCurve2 = myPane.AddBar("curve 2", Plist1, Color.Red);

                //LineItem myCurve = myPane.AddCurve("curve 1", list, Color.Blue);
                //LineItem myCurve2 = myPane.AddCurve("curve 2", list1, Color.Red);
                nodeChart.AxisChange();
                //nodeChart.Refresh();

                //nodeChart.Invalidate();

                // 创建每条bar的label,其中第2个参数表示是否显示在bar的中心位置，第3个参数表示label的排列方向
                //BarItem.CreateBarLabels(myPane, false, "f0");

                if (myCurve.NPts>40)
                {
                        myCurve.RemovePoint(0);
                }
                if (myCurve2.NPts > 40)
                {                 
                        myCurve2.RemovePoint(0);
                }
                timer1.Start();
            }
        }