C# 串口波形显示

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.IO.Ports;

using System.Text.RegularExpressions;

namespace serial1

{

public partial class Form1 : Form

{

int maxRate; //最大比例

private bool listening = false;

private bool closing = false;

Point lastPoint,nowPoint;

List<double> l = new List<double>(); //存储串口接收的值

Graphics g; //生成图形

Pen drawPen=new Pen(Color.Red,1);

private StringBuilder builder = new StringBuilder();

private SerialPort comm = new SerialPort();

public Form1()

{

InitializeComponent();

}

private void pictureBox1_Paint(object sender, PaintEventArgs e)

{

g = e.Graphics;

pictureBox1.Width = l.Count();

g.DrawLine(new Pen(Color.Black, 1), new Point(0, pictureBox1.Height / 2), new Point(pictureBox1.Width, pictureBox1.Height / 2));

lastPoint = new Point(0,pictureBox1.Height/2);

//如果发生值大于最大值，则画笔变为黄色

for (int i = 1; i < this.pictureBox1.Width; i++)

{

if (l[i] > maxRate/2)

{

drawPen.Color = Color.Yellow;

l[i] = maxRate/2;

}

else

{

drawPen.Color = Color.Red;

}

nowPoint.X = i;

double tmpY = l[i] / maxRate;

tmpY =Math.Abs( (tmpY * pictureBox1.Height)-(pictureBox1.Height/2));

nowPoint.Y =Convert.ToInt32( tmpY);

//nowPoint.Y = Math.Abs(l[i] / maxRate * pictureBox1.Height - pictureBox1.Height);

g.DrawLine(drawPen, lastPoint, nowPoint);

lastPoint = nowPoint;

}

}

private void Form1_Load(object sender, EventArgs e)

{

}

void comm_dataReceived(object sender, SerialDataReceivedEventArgs e)

{

if (closing) return; //防止关闭时锁死

string tmpS = comm.ReadLine();

builder.Append(tmpS);

string s = builder.ToString();

builder.Clear();//清除字符串构造器

string[] arr = s.Split(‘\n‘, ‘\r‘).Where(t => t.Trim() != "").ToArray();

////因为要访问ui资源，所以需要使用invoke方式同步ui。

this.Invoke((EventHandler)(delegate

{

try

{

int tmpC=0;

listening = true;

for (int i = 0; i < arr.Length; i++)

{

int c = Convert.ToInt32(arr[i]);

if (Math.Abs(tmpC - c) > 100) Console.Out.WriteLine("错误");

textBox1.AppendText(Convert.ToString(c)+‘\n‘);

l.Add(c);

tmpC = c;

}

}

catch

{

;

}

finally

{

listening = false;

}

pictureBox1.Width = l.Count();

}));

}

private void button1_Click(object sender, EventArgs e)

{

comm.PortName = comboBox1.SelectedItem.ToString();

comm.BaudRate =Convert.ToInt32( comboBox2.SelectedItem.ToString());

maxRate =Convert.ToInt32( textBox2.Text);

comm.Open();

comm.DataReceived += comm_dataReceived;

}

private void button2_Click(object sender, EventArgs e)

{

closing = true;

while (listening) Application.DoEvents();

MessageBox.Show("ok");

comm.Close();

closing = false;

}

private void button4_Click(object sender, EventArgs e)

{

//16进制发送

if (checkBoxHexSend.Checked)

{

//我们不管规则了。如果写错了一些，我们允许的，只用正则得到有效的十六进制数

MatchCollection mc = Regex.Matches(txSend.Text, @"(?i)[/da-f]{2}");

List<byte> buf = new List<byte>();//填充到这个临时列表中

//依次添加到列表中

foreach (Match m in mc)

{

buf.Add(byte.Parse(m.Value));

}

//转换列表为数组后发送

comm.Write(buf.ToArray(), 0, buf.Count);

}

else//ascii编码直接发送

{

//包含换行符

if (checkBoxNewlineSend.Checked)

{

comm.WriteLine(txSend.Text);

}

else//不包含换行符

{

comm.Write(txSend.Text);

}

}

}

}

}