DREAM IT, WISH IT, DO IT

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

namespace LineChartTEST
{
    public partial class Form1 : Form
    {
        private delegate void CanIJust();
        private List<int> _valueList;
        private List<double>_timeList;
        private List<int> _customValueList;

        string InputData = String.Empty;
        delegate void SetTextCallback(string text);
        SerialPort SP = new SerialPort();
        public Form1()
        {        
	    InitializeComponent();
  	    _valueList = new List<int>();
            _timeList = new List<double>();
           _customValueList = new List<int>();

            SP.PortName = "COM9";
            SP.BaudRate = 115200;
            SP.DataBits = 8;
            SP.Parity = Parity.None;
            SP.StopBits = StopBits.One;
            SP.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
            SP.Open();
        }

        protected override void OnClosed(EventArgs e)
        {
          base.OnClosed(e);
        }

        private void UpdateSecondChart()
        {
            chart.Series[0].Points.AddXY(_timeList[_timeList.Count - 1], _customValueList[_customValueList.Count - 1]);
            chart.Series[0].IsValueShownAsLabel = true; 
            chart.Legends[0].Enabled = false;            
            chart.Invalidate();
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            chart.Series[0].Points.Clear();
        }

        private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            InputData = SP.ReadExisting();

            if (InputData != String.Empty)
            {
                if(InputData.Length > 4)
                {
                    if (String.Compare(InputData.Substring(1, 2), "P") == 0 || String.Compare(InputData, "P")== 0)
                    {                      
                       SP.WriteLine("K");
                    }
                }
                else if (String.Compare(InputData, "P")== 0)
                {
                }
                else
                {
                    if (InputData.Length >= 2)
                    {                      
                       SetText(InputData.Substring(0, InputData.Length - 1));
                    }
                    else
                    {
                    }
                }
            }
        }
        private void SetText(string text)
        {
            if (this.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {                             
                _customValueList.Add(Convert.ToInt32(text));
                UpdateSecondChart();
            }
        }
        private void button_Click(object sender, EventArgs e)
        {
            if (SP.IsOpen)
                SP.WriteLine("K");
            else
                MessageBox.Show("Serial port is closed!");
        }
    }
}
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