从c#启动gnuplot,更改目录并加载多个gnuplot脚本

时间:2013-07-18 07:36:34

标签: c# gnuplot

我想在C#应用程序中生成几百个.txt脚本,启动GnuPlot并为我拥有的每个脚本生成.png图形。

我可以使用以下代码从C#启动GnuPlot:

Process gnuPlotProcess = new Process();
gnuPlotProcess.StartInfo = new ProcessStartInfo(@"C:\Program Files\gnuplot\bin\wgnuplot.exe");
gnuPlotProcess.Start();

当我尝试更改当前目录时,出现第一个问题,在开始此过程之前添加以下代码:

gnuPlotProcess.StartInfo.Arguments = "cd '" + scriptsPath + "'";

现在GnuPlot没有开始。

第二个问题,我能够在GnuPlot的默认当前目录上进行测试,是在尝试传递" load' script_xxx.txt'"命令。以下是完整代码(来自Plotting graph from Gunplot in C#的灵感):

Process gnuPlotProcess = new Process();
gnuPlotProcess.StartInfo = new ProcessStartInfo(@"C:\Program Files\gnuplot\bin\wgnuplot.exe");
gnuPlotProcess.StartInfo.RedirectStandardInput = true;
gnuPlotProcess.StartInfo.UseShellExecute = false;
theProcess.Start();
StreamWriter sw = gnuPlotProcess.StandardInput;
sw.WriteLine("load '" + pathToScript + "'");
sw.Flush();

在pathToScript上找到的脚本应该创建一个.png文件,它可以直接从gnuPlot启动。但是从代码来看,没有任何反应。

任何帮助都将不胜感激。

1 个答案:

答案 0 :(得分:0)

我希望此代码能为您提供帮助:

        int N = 1000;                                    
        string dataFile = "data.txt";                  // one data file
        string gnuplotScript = "gnuplotScript.plt";    // gnuplot script
        string pngFile = "trajectory.png";             // output png file

        // init values
        double x = 0, y = 0;

        // random values to plot
        Random rnd = new Random();
        StreamWriter sw = new StreamWriter(dataFile);

        // US output standard
        Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("en-US");

        // generate data for visualisation       
        for (int i = 0; i < N; i++)
        {
            x += rnd.NextDouble() - 0.5;
            y += rnd.NextDouble() - 0.5;
            sw.WriteLine(x.ToString("F3") + "\t" + y.ToString("F3"));
        }
        sw.Close();

        // you can download it from file
        string gnuplot_script = "set encoding utf8\n" +
                                "set title \"Random trajectory\"\n" +
                                "set xlabel \"Coordinate X\"\n" +
                                "set ylabel \"Coordinate Y\"\n" +
                                "set term pngcairo size 1024,768 font \"Arial,14\"\n" +
                                "set output \"pngFile\"\n" +
                                "plot 'dataFile' w l notitle\n" +
                                "end";

        // change filenames in script
        gnuplot_script = gnuplot_script.Replace("dataFile", dataFile);
        gnuplot_script = gnuplot_script.Replace("pngFile", pngFile);

        // write sccript to file
        sw = new StreamWriter(gnuplotScript, false, new System.Text.UTF8Encoding(false));
        sw.WriteLine(gnuplot_script);
        sw.Close();

        // launch script
        ProcessStartInfo PSI = new ProcessStartInfo();
        PSI.FileName = gnuplotScript;
        string dir = Directory.GetCurrentDirectory();
        PSI.WorkingDirectory = dir;
        using (Process exeProcess = Process.Start(PSI))
        {
            exeProcess.WaitForExit();
        }

        // OPTION: launch deafault program to see file
        PSI.FileName = pngFile;
        using (Process exeProcess = Process.Start(PSI))
        {
        }

您可以使用自己的数据重复此示例,因为您可以多次制作许多png文件