/**
* File:  			PetRockApplet.java
* Author:			Mr. Instructor
* Programming:  	lCCC - CIS 210
* Last Modified: 	January 2011
* Description: This applet creates, draws, computes
* the area, and flips a pet rock (a rectangle with a name)
*/

import java.awt.*;				// go get the java "standard graphic" classes
import java.applet.Applet;		// go get the java "standard applet" classes
import java.awt.event.*;		// go get the java "standard event" classes

public class PetRockApplet extends Applet implements ActionListener
{
	private int      length;		// length of rectangular rock
	private int      width;		    // width of rectangular rock
	private String   name;		    // name of rock
	private Button   flipButton;	// declare a flip button (but don't "fill" it yet)


	/**
	* The init() method initializes/starts/creates rock
	*/
	public void init()
	{
		PetRockApplet myPetRock;			// declare an empty PetRockApplet class called "myPetRock"
		myPetRock  = new PetRockApplet();	// create (instantiate) the new PetRock
		flipButton = new Button("Click to see my pet rock flip!");  // create the button
		add(flipButton);				    // draw the button
		flipButton.addActionListener(this);	// listen for a mouse click
		repaint();						    // draw the rock on the screen
	}	// init applet


	/**
	* The PetRockApplet() method constructs the pet rock with a given
	* length and width and name.
	*/
	public PetRockApplet()
	{
		name 	= "Mr. Instructor's Pet Rock";
		length	= 30;
		width  	= 70;
	}	// PetRock constructor


	/**
	* The calculateArea() method calculates and returns
	* the area of the (rectangular) rock.
	*/
	public double calculateArea()
	{
		double area;
		return area = length * width;
	}	// calculateArea()


	/**
	* The flip() method switches the length and width of the rock
	* then redraws the picture.
	*/
	public void flip()
	{
		int temp;			// need the temp variable only in this method
		temp   = width;
		width  = length;
		length = temp;
	}	// flip()


	/**
	* The paint() method draws the rock (a rectangle) as well
	* as the name of the rock then computes and prints the area
	* of the rock using the calculateArea() method.
	*/
	public void paint(Graphics g)			// create a graphics object (predefined)
	{
		g.drawString(name,50,60);		    // draws the name at 50 over and 60 down
		g.setColor(Color.red);			    // sets the rock's color to red
		g.fillRect(100,150,width,length);	// draws the rectangular Rock
		g.drawString("The length :"+length,50,75);			// what does this line draw?
		g.drawString("The width : "+width,50,90);
		g.drawString("The area : "+calculateArea(),50,105);	// what does this line draw?
	}	// paint()


	/**
	* The actionPerformed() method is automatically called whenever
	* the flip button is clicked.
	*/
	public void actionPerformed(ActionEvent e)
	{
		flip();				// flip the length and width
		repaint();			// redraw the picture
	}	// actionPerformed()

}	// end petRockApplet