上位机波形显示求串口数据波形显示代码，C#的！先表示感谢！ -

/*************************************************************************************************************
串口配置
************************************************************************************************************/
SerialPort sp = null;
bool isOpen = false;
bool isSetProperty = false;
bool Enter_flag = false;
bool Rece_flag = false;
//窗口加载
private void Form1_Load(object sender, EventArgs e)
{
this.MaximumSize = this.Size;
this.MinimumSize = this.Size;
this.MinimizeBox = false;
for (int i = 0; i < 10; i++)
{
comboBox1.Items.Add("COM" + Convert.ToString(i + 1));
}
comboBox2.Items.Add("1200");
comboBox2.Items.Add("2400");
comboBox2.Items.Add("4800");
comboBox2.Items.Add("9600");
comboBox2.Items.Add("19200");
comboBox2.Items.Add("38400");
comboBox2.Items.Add("43000");
comboBox2.Items.Add("115200");
comboBox2.SelectedIndex = 3;
}
//设置串口属性
void SetPortProperty()
{
sp = new SerialPort();
sp.PortName = comboBox1.Text.Trim();
sp.BaudRate = Convert.ToInt32(comboBox2.Text.Trim());
sp.StopBits = StopBits.One;
sp.Parity = Parity.None;
sp.DataBits = 8;
sp.RtsEnable = true;
sp.ReadTimeout = -1;
sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
}
//接收数据
private void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
this.Invoke((EventHandler)(delegate
{
try
{
float data;
string str = sp.ReadExisting();
textBox1.AppendText(str+" ");
textBox3.Text = str;
data = Convert.ToSingle(str);
AddData(data);
}
catch (Exception)
{
MessageBox.Show("读数据出错", "错误提示！");
}
if (Rece_flag)
textBox1.Text += "\r\n";
this.textBox1.Focus();
this.textBox1.Select(this.textBox1.TextLength, 0);
this.textBox1.ScrollToCaret();
sp.DiscardInBuffer();
}));
}
private void button1_Click(object sender, EventArgs e)
{
bool comExistence = false;
comboBox1.Items.Clear();
for (int i = 0; i < 10; i++)
{
try
{
SerialPort sp = new SerialPort("COM" + Convert.ToString(i + 1));
sp.Open();
sp.Close();
comboBox1.Items.Add("COM" + Convert.ToString(i + 1));
comExistence = true;
}
catch (Exception)
{
continue;
}
}
if (comExistence)
{
comboBox1.SelectedIndex = 0;
}
else
{
MessageBox.Show("没有找到可用串口！", "错误提示");
}
}
private void button2_Click(object sender, EventArgs e)
{
if (isOpen == false)
{
if (!isSetProperty)
{
isSetProperty = true;
SetPortProperty();
}
try
{
sp.Open();
isOpen = true;
button1.Enabled = false;
button2.BackColor = Color.Red;
button2.Text = "关闭";
}
catch (Exception)
{
isSetProperty = false;
isOpen = false;
MessageBox.Show("串口无效或已被占用！", "错误提示");
}
}
else
{
try
{
sp.Close();
isOpen = false;
isSetProperty = false;
button1.Enabled = true;
button2.BackColor = Color.White;
button2.Text = "开";
}
catch (Exception)
{
MessageBox.Show("串口异常断开！", "错误提示");
}
}
}
private void button3_Click(object sender, EventArgs e)
{
byte[] Data = new byte[1];
if (isOpen)
{
try
{
byte[] data = Encoding.Default.GetBytes(textBox2.Text);
sp.Write(data, 0, data.Length);
}
catch (Exception)
{
MessageBox.Show("数据发送是发生错误！", "错误提示");
return;
}
if (Enter_flag)
sp.Write("\r\n");
}
else
{
MessageBox.Show("串口未打开！", "错误提示");
return;
}
}
2.波形的显示
初始化参数：
private const int Unit_length = 50;//单位格大小
private const int StartPrint = 50;//点坐标偏移量
private List<float> DataList = new List<float>();//数据结构----线性链表
private Pen TablePen = new Pen(Color.FromArgb(0xff, 0xff, 0xff));//轴线颜色
private Pen LinesPen = new Pen(Color.FromArgb(0xff, 0x00, 0x00));//波形颜色
波形网格图绘制：
波形的显示，我们采用绘制直线的方式，绘制网格图，使用Graphics对象的Drawline()方法.
pubulic void Drawline(Pen pen,int x1,int y1,int x2,int y2);其中，pen对象是画线所用的画笔，它决定了线的颜色、宽度和样式；x1和y1的起点坐标，x2和y2的终点坐标；
绘制表格的代码如下：
for (int i = 0; i <=10 ; i++)
{
e.Graphics.DrawLine(TablePen, StartPrint + i * Unit_length, StartPrint - 32, StartPrint + i * Unit_length, 7* Unit_length + 18);//画线
gp.AddString((i * 10).ToString(), family, fontstyle, 18, new RectangleF(StartPrint + i * Unit_length - 7, 7 * Unit_length + 18 + 4, 400, 50), null);//添加文字
}
gp.AddString("时间", family, fontstyle, 18, new RectangleF(groupBox4.ClientRectangle.Width/2 - StartPrint, 7 * Unit_length+36, 400, 50), null);
////Draw X 横向轴绘制
for (int i = 0; i < 8; i++)
{
e.Graphics.DrawLine(TablePen, StartPrint, i *Unit_length+18, StartPrint + 10 * Unit_length, i* Unit_length+18);//画线
Str = Convert.ToString((7 - i) * 10);
if (i == 0)
Str = "70";
if (i == 7)
break;
gp.AddString(Str, family, fontstyle, 18, new RectangleF(20, i * Unit_length+8, 400, 50), null);//添加文字
}
gp.AddString("温", family, fontstyle, 18, new RectangleF(0,groupBox4.ClientRectangle.Height/2-StartPrint, 400, 50), null);
gp.AddString("度", family, fontstyle, 18, new RectangleF(0,groupBox4.ClientRectangle.Height /2+18-StartPrint, 400, 50), null);
e.Graphics.DrawPath(Pens.White, gp);//写文字
画波形图代码：
for (int i = 0; i < DataList.Count - 1; i++)
{
e.Graphics.DrawLine(LinesPen, StartPrint + i * 10, 7 * Unit_length + 18 - DataList[i]*5, StartPrint + (i+1) * 10, 7 * Unit_length + 18 - DataList[i + 1]*5);
}
我们需要给线性链表datalist增加数据：
void AddData(float Data)
{
DataList.Add(Data);
groupBox4.Invalidate();
}

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