// The ehtBall is a magic eight ball emulator that gives answers in
// Canadian slang.
// Written By: Kevin VanSchepen
// Fall Semester, Calvin College
// For: CPSC 280 - Programming Languages
// Requirements: the 11 gif images that are displayed are located in the same
//               directory as the class file.
//               width and height have to be set greater than the image sizes
//               no additional parameters.
// Options:      you may change the images to give different responses
//               as long as they are named the same

import java.awt.*;
import java.applet.*;
import java.util.*;
import java.io.*;
import java.lang.Math;

public class ehtBall extends Applet {
  protected Button answerButton = new Button("GO");   // Button to get answer
  protected Button resetButton = new Button("Reset"); // Button to reset
  protected String imageName = "8ball2.gif";          // filename of the image 
  protected Image eightBall;
  Graphics g;

  // init(): Initializer function that runs automatically
  // sets: background, the 8 ball image, and the buttons
  public void init() {
    setBackground(Color.white);                       // sets the background
    eightBall = getImage(getDocumentBase(), imageName); // defines the image

    answerButton.setForeground(Color.white);          // button initialization
    answerButton.setBackground(Color.black);
    this.add(answerButton);

    resetButton.setForeground(Color.white);
    resetButton.setBackground(Color.black);
    this.add(resetButton);

    g = this.getGraphics();                            // defines g
  }
  
  // action: functions that handles the event of a button click
  public boolean action(Event e, Object arg) {         
                                          // what to do when a button is pushed
    if (e.target == answerButton) {       // if it is the "GO" button
      imageName = new String("8ballani.gif");  // animate
      repaint();                          // repaint the screen
      getAnswer();                        // get an answer
      repaint();                          // repaint the screen
      return true;
    }

    else if (e.target == resetButton) {   // if it is the "RESET" button
      imageName = new String("8ball2.gif"); // reset to the initial image
      repaint();                          // repaint the screen
      return true;
    }

    else return false;
  }

  // getAnswer(): generates a random number and then sets the 
  // image according to that number - which gives the answer
  // to a question
  public void getAnswer() {
    int theInt = (int)(Math.random()*10); // gets a random int from 0 to 9

    switch(theInt)                       // sets the images depending on theInt
      {
      case 0: {
	imageName = new String("8ball-0.gif");
	break;
      }

      case 1: {
	imageName = new String("8ball-1.gif");
	break;
      }
      
      case 2: {
	imageName = new String("8ball-2.gif");
	break;
      }
      
      case 3: {
	imageName = new String("8ball-3.gif");
	break;
      }
      
      case 4: {
	imageName = new String("8ball-4.gif");
	break;
      }
      
      case 5: {
	imageName = new String("8ball-5.gif");
	break;
      }

      case 6: {
	imageName = new String("8ball-6.gif");
	break;
      }
      
      case 7: {
	imageName = new String("8ball-7.gif");
	break;
      }
      
      case 8: {
	imageName = new String("8ball-8.gif");
	break;
      }
      
      case 9: {
	imageName = new String("8ball-9.gif");
	break;
      }
      
      default: {
	imageName = new String("8ball2.gif");
	break;
      }
      }
  }

  // paint: a function that is called automatically at init
  // paints the image on the screen
  public void paint(Graphics g) {
    eightBall = getImage(getDocumentBase(), imageName);   // sets the image
    g.drawImage(eightBall, 19, 40, this);                 // places the image
  }
}