import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;

/* This applet draws circles wherever the mouse has been clicked. When the maximum number of circles have been drawn, all the circles are joined by lines. */

public class Figures extends Applet
{
    private Graphics g;
    private int [] xValues;
    private int [] yValues;
    private int numberClicks;
    final int maxClicks = 10;

    public void init ()
    {
        addMouseListener (new DrawPictureListener ());
        g = getGraphics ();
        xValues = new int [maxClicks];
        yValues = new int [maxClicks];
        numberClicks = 0;
    } // method init

    /* Inner class that draws a circle when the user clicks the mouse. It then connects all the circles with lines after the last one is drawn. */
    class DrawPictureListener implements MouseListener
    {
        public void mousePressed (MouseEvent e)
        {
            int x = e.getX ();
            int y = e.getY ();
            if (numberClicks < maxClicks)
            {
                xValues [numberClicks] = x;
                yValues [numberClicks] = y;
                numberClicks ++;
                Circle circle = new Circle (Color.red, x, y, 10);
                circle.drawCircle (g);
            }
            else
            {
                Graph graph = new Graph ();
                graph.drawGraph (g, xValues, yValues, maxClicks);
            }
        } // method mouseClicked

        public void mouseEntered (MouseEvent e) {}
        public void mouseExited (MouseEvent e) {}
        public void mouseClicked (MouseEvent e) {}
        public void mouseReleased (MouseEvent e) {}
    } // class DrawPictureListener
} // class Figures

class Graph
{
    public void drawGraph (Graphics g, int [] xValues, int [] yValues, int maxClicks)
    {
        g.setColor (Color.blue);
        for (int count = 0; count < maxClicks-1; count ++)
            g.drawLine (xValues [count], yValues [count], xValues [count+1], yValues [count+1]);
        g.drawLine (xValues [0], yValues [0], xValues [maxClicks-1], yValues [maxClicks-1]);
    } // method drawGraph
} // class Graph

class Circle
{
    private Color color;
    private int x, y, diameter;

    Circle (Color c, int xPosition, int yPosition, int d)
    {
        color = c;
        x = xPosition;
        y = yPosition;
        diameter = d;
    } // constructor

    public void drawCircle (Graphics g)
    {
        g.setColor (color);
        g.drawOval (x, y, diameter, diameter);
    } // method drawCircle
} // class Circle