AreaApplet

/*
 *  Filename:       AreaApplet.java
 *  Created:        August 29, 2002, 8:35 PM
 *  Author:         David Reid
 *  Class:          JDE155H - Introduction to Computer Science I
 *  Instructor:     Chuck Cusack
 *  
 *  Description:    Area is a simple Java program that calculates areas of five shapes from
 *                  input by the user.  It performs these actions without a GUI, but rather
 *                  message boxes, because I only know how to use them at the moment.  Kudos
 *					to Mike Kok and Dan Christensen for solving a simple problem that took me
 *					two hours and a dinner break to figure out.  :)
 */


import java.awt.*;
import java.applet.*;
import javax.swing.JOptionPane;  //  Import the JOptionPane for message and input boxes.

public class AreaApplet extends Applet {
	
	public void init() {
	}
	
	public void start() {
		
		try {
			
			//  Declare variables.
			Object msgValue;
			String shape, msgResponse, strLength1, strLength2;
			int intLength1, intLength2, loopAgain;
			
			//  The beginning of the giant loop to recalculate another shape.
			do {
				
				//  Create shape options.
				Object[] msgOptions = {"Circle", "Ellipse", "Triangle", "Square", "Rectangle"};
				//  Input shape
				msgValue = JOptionPane.showInputDialog(null, "Please select a shape below.", "Dave's Magical Area Finder > Menu", JOptionPane.QUESTION_MESSAGE, null, msgOptions, msgOptions[0]);
				//  Convert shape to a string (so it can be compared easily)
				shape = msgValue.toString();
				
				//  Deduce which shape the user selected.
				if (shape == "Circle") {
					//  Input necessary values to calculate area.
					strLength1 = JOptionPane.showInputDialog(null, "Enter the radius", "Area: Circle", JOptionPane.QUESTION_MESSAGE);
					//  Convert string to integer so we can work math with it.
					intLength1 = Integer.parseInt(strLength1);
					//  Display area.
					JOptionPane.showMessageDialog(null, "The area of a circle with a radius of "+intLength1+" is "+(intLength1*intLength1*Math.PI), "Dave's Magical Area Finder > Circle", JOptionPane.INFORMATION_MESSAGE);
				}
				else if (shape == "Ellipse") {
					strLength1 = JOptionPane.showInputDialog(null, "Enter the first radius", "Dave's Magical Area Finder > Ellipse", JOptionPane.QUESTION_MESSAGE);
					strLength2 = JOptionPane.showInputDialog(null, "Enter the second radius", "Dave's Magical Area Finder > Ellipse", JOptionPane.QUESTION_MESSAGE);
					intLength1 = Integer.parseInt(strLength1);
					intLength2 = Integer.parseInt(strLength2);
					JOptionPane.showMessageDialog(null, "The area of an ellipse with radi of "+intLength1+" and "+intLength2+" is "+((intLength1+intLength2)/2*Math.PI), "Dave's Magical Area Finder > Ellipse", JOptionPane.INFORMATION_MESSAGE);
				}
				else if (shape == "Triangle") {
					strLength1 = JOptionPane.showInputDialog(null, "Enter the base length", "Dave's Magical Area Finder > Triangle", JOptionPane.QUESTION_MESSAGE);
					strLength2 = JOptionPane.showInputDialog(null, "Enter the height", "Dave's Magical Area Finder > Triangle", JOptionPane.QUESTION_MESSAGE);
					intLength1 = Integer.parseInt(strLength1);
					intLength2 = Integer.parseInt(strLength2);
					JOptionPane.showMessageDialog(null, "The area of a triangle with a base length of "+intLength1+" and a height of "+intLength2+" is "+((intLength1*intLength2)/2), "Dave's Magical Area Finder > Triangle", JOptionPane.INFORMATION_MESSAGE);
				}
				else if (shape == "Square") {
					strLength1 = JOptionPane.showInputDialog(null, "Enter the length of one side", "Dave's Magical Area Finder > Square", JOptionPane.QUESTION_MESSAGE);
					intLength1 = Integer.parseInt(strLength1);
					JOptionPane.showMessageDialog(null, "The area of a square with a side lenght of "+intLength1+" is "+(intLength1*intLength1),"Dave's Magical Area Finder > Square",JOptionPane.INFORMATION_MESSAGE);
				}
				else if (shape == "Rectangle") {
					strLength1 = JOptionPane.showInputDialog(null, "Enter the first length", "Dave's Magical Area Finder > Rectangle", JOptionPane.QUESTION_MESSAGE);
					strLength2 = JOptionPane.showInputDialog(null, "Enter the second length", "Dave's Magical Area Finder > Rectangle", JOptionPane.QUESTION_MESSAGE);
					intLength1 = Integer.parseInt(strLength1);
					intLength2 = Integer.parseInt(strLength2);
					JOptionPane.showMessageDialog(null, "The area of a rectangle with side lengths of "+intLength1+" and "+intLength2+" is "+(intLength1*intLength2), "Dave's Magical Area Finder > Rectangle", JOptionPane.INFORMATION_MESSAGE);
				}
				else {
					//  This is not necessary.  It was left over from when I had the user type in the shape.  It is now here just as a precautionary measure.
					JOptionPane.showMessageDialog(null, "Shape not recognized", "Area: Error", JOptionPane.ERROR_MESSAGE);
				}
				
				//  Ask whether to recalculate another shape and loop.
				loopAgain = JOptionPane.showConfirmDialog(null, "Thank you sir.  May I have another?", "Dave's Magical Area Finder > Again?", JOptionPane.YES_NO_OPTION);
			
			} 
			//  Loop until the user clicks 'No' (1 = Yes, 2 = No).
			while (loopAgain == 0);
			
			//  Say goodbye and exit.
			JOptionPane.showMessageDialog(null, "Thank you.  Please come again.\n\nI'll be back...", "Dave's Magical Area Finder", JOptionPane.PLAIN_MESSAGE);
		
		}
		
		catch(Exception e) {
			JOptionPane.showMessageDialog(null, "The error "+e+" has been caught!\nThe program will now exit.\n\nWe're sorry for the inconvenience.", "Dave's Magical Area Finder > ERROR", JOptionPane.ERROR_MESSAGE);
		}
		
		finally {	
			System.exit(0);
		}
		
	}
	
}