Write a class in Java to plot a Scatter diagram for the data available from the instance of Statistical Data class defined in exercise 24 earlier. Make a provision for selecting the variables for which scatter diagram is to be plotted.

[ scatter_dig.java ]

import java.io.*;

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

/*

<applet code="scatter_dig" width=500 height=400>

</applet>

*/

public class scatter_dig extends Applet

{

   int no[],size;

   int h,w;

   public void init()

   {

    int i=0;

    no=new int[100];

    String line;

    try

    {

     File f=new File("E:\\SCATTER\\abc.txt");

     BufferedReader br=new BufferedReader(new FileReader(f));

     while( (line=br.readLine())!=null)

     {

          no[i]=Integer.parseInt(line);

          i++;

     }

     size=i;

    }

    catch(Exception e)

    {

    }

   }

   public void paint(Graphics g)

   {

    h=getHeight();

    w=getWidth();

    drawPlane(g);

    drawScatter(g);

    g.setFont(new Font(Font.SERIF,Font.BOLD,27));

    g.drawString("SCATTER DIAGRAM",w/2-100,20);

    g.setFont(new Font(Font.SERIF,Font.PLAIN,18));

    g.drawString("--Pankaj Sharma",w/2,40);

    showStatus("pankaj Sharma");

   }

   public void drawPlane(Graphics g)

   {

    int linex=50,liney=h-50;

    int diff=((h-100)/10);

    g.drawLine(50,50,50,h-50);

    g.drawLine(50,h-50,w-50,h-50);

    for(int i=0;i<=10;i++)

    {

     g.drawLine(linex-10,liney,linex,liney);

     g.drawString(i*10+"",linex-20,liney);

     liney=liney-diff;

    }

    for(int i=0;i<size+5;i++)

    {

     g.drawLine(linex,h-50,linex,h-40);

     g.drawString(i+"",linex-5,h-25);

     linex=linex+20;

    }

   }

   public void drawScatter(Graphics g)

   {

    int pointx=50;

    for(int i=0;i<size-1;i++)

    {

     g.drawLine(pointx,h-50-((h-100)*no[i])/100,pointx+20,h-50-((h-100)*no[i+1])/100);

     pointx=pointx+20;

    }

   }

}