Question

我试图绘制使用Modbus命令读取的实时温度图。目前，我能够读取温度并绘制图表。但是，一旦它绘制了第一个点，它就不会持续更新图形和GUI。

我应该在Form1_Load以外的方法中运行吗？

private void Form1_Load(object sender, EventArgs e)
{
    chart1.ChartAreas.Add("Area");
    chart1.ChartAreas["Area"].AxisX.Minimum = -100;
    chart1.ChartAreas["Area"].AxisX.Maximum = 100;
    chart1.ChartAreas["Area"].AxisX.Interval = 1;
    chart1.ChartAreas["Area"].AxisY.Minimum = -100;
    chart1.ChartAreas["Area"].AxisY.Maximum = 100;
    chart1.ChartAreas["Area"].AxisY.Interval = 1;

    //create a Data object array
    val[] data = new val[5];

    string[] ports = SerialPort.GetPortNames();
    this.comboBox1.DataSource = ports;
    serialPort1.PortName = "COM5";
    using (SerialPort port = new SerialPort("COM5"))
    {
        //start time object
        DateTime start = DateTime.Now;
        int startSec = start.Second;

        port.Open();
        byte slaveID = 1;
        ushort startAddress = 360;
        ushort numOfPoints = 2;
        ModbusSerialMaster master = ModbusSerialMaster.CreateRtu(port);

        for (int j = 0; j < 5; j++)
        {
            ushort[] holding_register = master.ReadHoldingRegisters(slaveID, startAddress,
            numOfPoints);

            ushort val1 = holding_register[0];
            ushort val2 = holding_register[1];

            uint t1 = (uint)(holding_register[0]);
            uint t2 = (uint)(holding_register[1] << 16);
            uint temp = (uint)(t1) | (t2);
            byte[] floatVals = BitConverter.GetBytes(temp);
            float f = BitConverter.ToSingle(floatVals, 0);
            c = 5.0 / 9.0 * (f - 32);

            textBox1.Text = c.ToString();

            DateTime current = DateTime.Now;
            int currentSec = current.Second;
            int time = currentSec - startSec;

            chart1.Refresh();

            data[j].time = time;
            data[j].temperature = c;

            chart1.Series[j].Points.Add(new DataPoint(data[j].time, data[j].temperature));

            chart1.Refresh();

            port.Close();
        }
    }
}

Answer 1

使您的串口成为成员变量，然后在表单中添加一个计时器。然后，您可以解析串行数据并将数据点附加到计时器回调中的图形中。

C＃窗体应用程序中的实时图形

1 个答案: