zed graphs 实时绘图速度会随着时间的推移而降低。我是否堵塞了串口？ C＃

Question

我目前正在探索 C# 世界并创建了我的第一个 windows 应用程序。一切正常，但我相信它的效率让我失望。

我目前正在从 Arduino 读取串行数据。所有数据都以“Letter”（换行符）“Number”（换行符）“letter”等格式发送。从这里我将数据排序到 table 中的相关列中。我有 6 组数据来自 Arduino。然后使用 zed 图表将这些数据绘制到图表上，一次只显示 5 秒的数据。所以一个移动轴。

在将数据绘制到图表上大约 20 秒后，绘图速度变慢，最终我留下了一个没有点的移动图表，因为它们落后了。

我尝试刷新串行缓冲区，但这使一切变得更慢。

private void IncomingDataSort()
{ 

        string IncomingSerial = serialPort1.ReadLine(); // Read incomming serial data
        string StrIncomingSerial = IncomingSerial.ToString(); // convert this data to workable string
        elapsed_time = (stopwatch.ElapsedMilliseconds); // How many milliseconds since stopwatch (read serial button) started
        elapsed_time_sec = elapsed_time / 1000;
        Timems.Text = elapsed_time.ToString();

        if (StrIncomingSerial.Contains("Z") || StrIncomingSerial.Contains("Y")) // If this string contains a "Z" or "Y"
        {
            if (StrIncomingSerial.Contains("Z"))
            {
                string Number = serialPort1.ReadLine(); // Read Serialport
                double Num; // Create variable "Num"
                bool isNum = double.TryParse(Number, out Num); // Is the incomming serial data a number?
                if (isNum) // If it is a number...
                {
                    int NumberInt = Convert.ToInt16(Number); // convert string to int
                    Heat1Temp.Text = Number;
                }
            }
            if (StrIncomingSerial.Contains("Y"))
            {
                string Number = serialPort1.ReadLine(); // Read Serialport
                double Num; // Create variable "Num"
                bool isNum = double.TryParse(Number, out Num); // Is the incomming serial data a number?
                if (isNum) // If it is a number...
                {
                    int NumberInt = Convert.ToInt16(Number); // convert string to int
                    Heat2Temp.Text = Number;
                }
            }
            CreateGraph1(zedGraphControl1, elapsed_time, Convert.ToInt16(Heat1Temp.Text), Convert.ToInt16(Heat2Temp.Text)); // plot gragh
        }
       }

    private void CreateGraph1(ZedGraphControl zgc, long time, int IncomingData, int IncomingData2)
    {
        GraphPane myPane = zgc.GraphPane; // setup graph

        zgc.AutoScroll = true;
        myPane.Title = "Graph 1"; // Titles 
        myPane.XAxis.Title = "Time (s)"; 
        myPane.YAxis.Title = "";
        myPane.Legend.IsVisible = false; // remove legend (DONT MAKE TRUE!!)
        myPane.XAxis.Min = myPane.XAxis.Max - GraphTimeSpan;

        PointPairList GraphInput = new PointPairList(); // create a new list
        PointPairList GraphInput2 = new PointPairList(); // create a new list

        long x;
        int y1;
        long x2;
        int y2;
        x = time; // x axis 1
        y1 = IncomingData; // y axis 1
        x2 = time; // x axis 2
        y2 = IncomingData2; // y axis 2

        GraphInput.Add(x, y1); // add to list
        GraphInput2.Add(x2, y2); // add to list

        LineItem myCurve = myPane.AddCurve("FirstSettings", GraphInput, Color.Red, SymbolType.Diamond); // draw points
        LineItem myCurve2 = myPane.AddCurve("SecondSettings", GraphInput2, Color.Blue, SymbolType.Diamond);

        zgc.AxisChange(); // update axis
        zgc.Refresh();
    }

Answer 1

作为我的评论的后续 - 无需每次获取数据时都添加一条新曲线，您只需将新点附加到现有的 PointPairLists - 这样您就只会拥有图形所需的两条曲线处理。将图表的初始化和更新分开是个好主意 - 所以像这样：

PointPairList GraphInput;
PointPairList GraphInput2;
LineItem myCurve;
LineItem myCurve2;

private void InitGraph(ZedGraphControl zgc)
{
    GraphPane myPane = zgc.GraphPane; // setup graph

    zgc.AutoScroll = true;
    myPane.Title = "Graph 1"; // Titles 
    myPane.XAxis.Title = "Time (s)"; 
    myPane.YAxis.Title = "";
    myPane.Legend.IsVisible = false; // remove legend (DONT MAKE TRUE!!)

    GraphInput = new PointPairList(); // create a new list
    GraphInput2 = new PointPairList(); // create a new list
    myCurve = myPane.AddCurve("FirstSettings", GraphInput, Color.Red, SymbolType.Diamond); // draw points
    myCurve2 = myPane.AddCurve("SecondSettings", GraphInput2, Color.Blue, SymbolType.Diamond);
}

private void UpdateGraph(ZedGraphControl zgc, long time, int IncomingData, int IncomingData2)
{
    GraphPane myPane = zgc.GraphPane; // setup graph

    myPane.XAxis.Max = time;
    myPane.XAxis.Min = myPane.XAxis.Max - GraphTimeSpan;

    GraphInput.Add(time, IncomingData); // add to list
    GraphInput2.Add(time, IncomingData2); // add to list

    // AT THIS POINT YOU COULD SEARCH THROUGH THE POINT LIST & REMOVE ANY POINTS PRIOR TO THE MIN TIME
    while (GraphInput[0].X < myPane.XAxis.Min)
    {
      GraphInput.RemoveAt(0);
    }
    while (GraphInput2[0].X < myPane.XAxis.Min)
    {
      GraphInput2.RemoveAt(0);
    }

    zgc.AxisChange(); // update axis
    zgc.Refresh();
}

另一种节省时间的方法可能是独立更新每条曲线 - 因为您正在向 GraphInput 和 GraphInput2 添加点，而不管您实际上是否有要为两者输入的点。使用单独的 UpdateGraph1 和 UpdateGraph2 方法可能会将要绘制的点减半。

代码中还有其他几项内容也可以整理 - 但它们不会导致严重的时间问题（您将数字从字符串转换，然后转换回字符串，然后再转换回数字 - 因为例如）。

Answer 2

非常感谢您的帮助，抱歉我花了这么长时间才回复，但我想在重新发布之前确保我有一段有效的代码。

这是我发现的有效解决方案，它可以帮助其他人。虽然请记住我是初学者所以几乎肯定需要整理！

 private void InitGraph1 (ZedGraphControl zgc)
        {
            GraphPane myPane = zgc.GraphPane; // setup graph

            zgc.AutoScroll = true;
            myPane.Title = "Graph 1"; // Titles 
            myPane.XAxis.Title = "Time (s)";
            myPane.YAxis.Title = "";
            myPane.Legend.IsVisible = false; // remove legend

            GraphInput1 = new PointPairList(); // create a new list
            GraphInput2 = new PointPairList(); // create a new list
            myCurve = myPane.AddCurve(DataOutputZ, GraphInput1, Color.Red, SymbolType.Diamond); // draw points
            myCurve2 = myPane.AddCurve(DataOutputY, GraphInput2, Color.Blue, SymbolType.Diamond);

         }

-

 private void UpdateGraph(ZedGraphControl zgc, long time, int IncomingData, int IncomingData2)
        {
            {
                GraphPane myPane = zgc.GraphPane;
                myPane.XAxis.Min = time - GraphTimeSpan;
                myPane.XAxis.Max = time + (GraphTimeSpan/4); // put new points in last quarter of graph

                // Get the first CurveItem in the graph
                LineItem myCurve = zgc.GraphPane.CurveList[0] as LineItem;
                LineItem myCurve2 = zgc.GraphPane.CurveList[1] as LineItem;

                PointPairList GraphInput1 = myCurve.Points as PointPairList;
                PointPairList GraphInput2 = myCurve2.Points as PointPairList;

                // add new data points to the graph
                GraphInput1.Add(time, IncomingData);
                GraphInput2.Add(time, IncomingData2);

                while (GraphInput1[0].X < myPane.XAxis.Min)
                {
                    GraphInput1.RemoveAt(0);
                }
                while (GraphInput2[0].X < myPane.XAxis.Min)
                {
                    GraphInput2.RemoveAt(0);
                }

                // force redraw
                zgc.Invalidate();
                zgc.AxisChange(); // update axis
                zgc.Refresh();
            }
        }

再次感谢！

zed graphs 实时绘图速度会随着时间的推移而降低。我是否堵塞了串口？ C＃

zed graphs real time plotting speed reduces over time. Am i clogging up the serial port? C#

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