Detailed introduction to the method of using C# to implement Windows Form calling R for drawing and display (picture)

It is well known that R software is very powerful and can perform various statistics and output graphics. The following introduces a method for communication between R language and C#, and a method for displaying R drawing results on the WinForm UI interface. The article introduces It's very detailed, friends in need can refer to it.

1. Prerequisite preparation

#To install R software, you need to install 32-bit R software, and an error will be reported if you call 64-bit. The other thing is to add R to the computer environment variables.

Open the R software and install the scatterplot3d package. This R package is required for the demonstration.

2. Create the projectGraphGenerateByR, the project structure is as follows:

##Note: You need to introduce RDotNet class library here, you can download it yourself: http://rdotnet.codeplex.com/

3. Main form code

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;

namespace GraphGenerateByR
{
 using RDotNet;
 public partial class Main : Form
 {
  public Main()
  {
   InitializeComponent();
  }
  REngine engine = null;

  string Rcode = "";
  private void btnPlot_Click(object sender, EventArgs e)
  {
   try
   {
    if(this.txtRcode.Text=="")
    {
     Rcode = @"library('scatterplot3d')
       z <- seq(-10, 10, 0.01) 
       x <- cos(z)
       y <- sin(z) 
       scatterplot3d(x, y, z, highlight.3d=TRUE, col.axis=&#39;blue&#39;, col.grid=&#39;lightblue&#39;,main=&#39;3d绘图&#39;,pch=20)
       ";
    }
    else
    {
     Rcode = this.txtRcode.Text;
    }

    //R.3.2.4
    engine = REngine.GetInstance();
    engine.Initialize();
    //图片加入GUID，防止重名（还有一种就是先删除后保存）
    string rnd = System.Guid.NewGuid().ToString().Replace("-", "");
    string filename ="i"+ rnd+ "Rimage.png";
    engine.Evaluate(string.Format("png(file=&#39;{0}&#39;,bg =&#39;transparent&#39;,width={1},height={2})", filename, this.ptbGraphic.Width, this.ptbGraphic.Height));

    //engine.Evaluate(@"x <- (0:12) * pi / 12
    //    y <- cos(x)
    //    plot(x,y);
    //    ");
    engine.Evaluate(Rcode);
    engine.Evaluate("dev.off()");
    string path = System.IO.Path.GetFullPath(filename);

    Bitmap image = new Bitmap(path);
    ptbGraphic.Image = image;
   }
   catch(Exception ex)
   {
    MessageBox.Show(ex.Message);
   }
  
  }

  private void Main_FormClosing(object sender, FormClosingEventArgs e)
  {
   if(engine!=null)
   {
    //clean up
    engine.Dispose();
   }
  }
 }
}

4. Run:

After clicking plot, call the default R code, the structure is as follows:

Enter the legal R drawing statement, click Plot again, the result is as follows:

##Summarize

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