// W2frame.java  click on points, connect the dots

import java.awt.*;
import java.awt.event.*;

public class W2frame extends Frame
{
  int boardSize;
  int x, y, b;
  int xp[] = new int[100];
  int yp[] = new int[100];
  int n;
  boolean connect;
  
  W2frame()
  {
    setTitle("W2frame");
    setSize(400,400);
    setBackground(Color.white);
    setForeground(Color.black);
    addWindowListener(new WindowAdapter()
    {
      public void windowClosing(WindowEvent e)
      {
        System.exit(0);
      }
    });
    setVisible(true);
    n=0;
    connect=false;
    this.addMouseListener (new mousePressHandler());
  }

  class mousePressHandler extends MouseAdapter
  {
    public void mousePressed (MouseEvent e)
    {
      x = e.getX();
      y = e.getY();
      b = e.getButton();
      xp[n]=x;
      yp[n]=y;
      if(y>350) System.exit(0);

      if(b==3 && n>0)
      {
        connect=true;
      }
      else
      {
        n++;
      }
      requestFocus();
      System.out.println("at x="+x+"   y="+y+"   b="+b); // debug print
      repaint();
    }
  }

  public void paint(Graphics g)
  {
    // draw a boundary
    g.drawRect(20, 60, 360, 300);
    g.drawString("press button 1 for point, press button 3 to connect", 20, 50);
    g.drawString("press here to quit", 100, 380);

    for(int i=0; i<n; i++)
    {
      g.drawOval(xp[i], yp[i], 2, 2);
    }
    if(connect)
    {
      for(int i=0; i<n-1; i++)
      {
        for(int j=i+1; j<n; j++)
        {
          g.drawLine(xp[i]+1, yp[i]+1, xp[j]+1, yp[j]+1);
        }
      }
      connect=false;
      n=0;
    }
  }

  public static void main(String args[])
  {
    new W2frame();
  }
}