/** MyApplet8.java: Interactive mouseDown Events
 ** Assignment:  Modify this file centering the click
 ** instruction at the top of the applet, and changing
 ** it to paint a different colored shape not centered
 ** on the tip of the pointer, in response to mouseDown
 ** events. You might also decide to add some other
 ** unusual (weird?) behavior to entertain (befuddle?)
 ** the user.
 ** Also, take a look at the MyApplet8.html webpage
 ** file for displaying this applet.                   **/

/** USE EXISTING JAVA CLASSES **/

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

/** EXTEND THE JAVA APPLET CLASS **/

public class MyApplet8 extends Applet
   {
    Font font = new Font("TimesRoman", Font.BOLD, 18);
    final int maxnumspots = 20;                       // Define max number of spots,
    final int maxnumevents = maxnumspots + 5;         // max number of events,
    int xevent[] = new int[maxnumevents];             // array of xcoords. of events,
    int yevent[] = new int[maxnumevents];             // array of ycoords. of events,
    int curevent = 0;                                 // and the current event number.
						      // Note that Java starts numbering
    public void init()	                              // with 0, instead of 1.
       {
        setBackground(Color.white);                   // Change the gray background to white.
        }

    /** HANDLE MOUSEDOWN EVENT **/

     public boolean mouseDown(Event e, int x, int y)
	{
         if (curevent < maxnumevents)                 // If the current event number
	  {                                           // (e.g. 0-24) is less than the
           addspot(x,y);                              // max number of events (e.g. 25),
	   return true;                               // then call the addspot method.
           }
	 else
	  {
           return false;
           }
	 }

     /** REPAINT THE FRAME USING THE ADDSPOT METHOD **/

     void addspot(int x, int y)
	{
         xevent[curevent] = x;                        // Record the xcoord. and ycoord.
	 yevent[curevent] = y;                        // of the current event.
	 curevent++;                                  // Add 1 to the current event number.
	 repaint();                                   // Call the paint method.
	 }

    /** CREATE THE CURRENT FRAME **/

    public void paint(Graphics g)
       {
        g.setColor(Color.blue);
        g.setFont(font);
        g.drawString("Click in Window", 100, 20);
	for (int i = 0; i < curevent; i++)    // Note that nothing happens here, until a
	  {                                   // mouseDown event occurs. Repaint all spots
           if (i < maxnumspots)               // from 0 to maxnumspots-1, each
	    {                                 // centered on the mouse pointer.
             g.fillOval(xevent[i] - 10,yevent[i] - 10,20,20);
             }
	   else
	    {
             g.setColor(Color.red);           // Also, if curevent > maxnumspots, then print
	     g.drawString("Ouch, ouch, too many spots !!",xevent[i],yevent[i]);  // this too.
             }
	   }
	}
    }