/**
 * This is the applet class for the Ramblecs game.
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Ramblecs extends JApplet
   implements ActionListener
{
 private LetterPanel whiteboard;
 private JButton go;

 public void init()
 {
  whiteboard = new LetterPanel();
  whiteboard.setBackground(Color.red);
  go = new JButton("Go");
  go.addActionListener(this);
  Container c = getContentPane();
  c.add(whiteboard, BorderLayout.CENTER);
  c.add(go, BorderLayout.EAST);
 }

 /**
  * Processes Go button events.
  */
 public void actionPerformed(ActionEvent e)
 {
  whiteboard.dropCube();
 }
}

/**
 * Implements a falling letter cube for the Ramblecs game
 */
import java.awt.*;

public class FallingCube
{
 private final int xLeft;   // Left margin for cubes
 private final int cubeSize;
 private int cubeX, cubeY;   // Cube coordinates (upper left corner)
 private int yStep; 
 private int nStep;
                // Distance (in pixels) to move down
                //  in one timer cycle
 private static final String letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 private char randomLetter;  // Cube letter

 public FallingCube(int size)
 {
  cubeSize = size;
  xLeft = cubeSize / 3;
  yStep = cubeSize / 17;
  cubeX = -cubeSize;     // off the board --
  cubeY = -cubeSize; 

 }

 public void start()
 {
  int i = (int)(Math.random() * letters.length());
  randomLetter = letters.charAt(i);
  cubeX = 0;
  cubeY = -cubeSize;     // above the board for smooth entry
 }

 public boolean moveDown()
 {
  if (cubeY < 11 * cubeSize) // board's height is 7 * cubesize
  {
   cubeY += yStep;
   return true;
  }
  else 
  
  {
    nStep += -yStep;

   return true;
  }
 }

 public void draw(Graphics g)
 {
  int x = xLeft + cubeX;
  int y = cubeY;

  g.setColor(Color.red);
  g.fill3DRect(x, y, cubeSize-1, cubeSize-1, true);
  g.setColor(Color. white);
  g.fillRoundRect(x + 5, y + 5, cubeSize - 10, cubeSize - 10,
                 cubeSize/2 - 5, cubeSize/2 - 5);
  g.setColor(Color.darkGray);
  String s = String.valueOf(randomLetter);
  g.drawString(s, x + cubeSize/2 - 6, y + cubeSize/2 + 5);
 }
}

/**
 * Implements a panel on which "letter cubes" fall
 * in the Ramblecs applet
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class LetterPanel extends JPanel
   implements ActionListener
{
 private FallingCube cube;
 private final int CUBESIZE = 70;
 private final int delay = 10;
 private Timer t;

 public LetterPanel()
 {
  cube = new FallingCube(CUBESIZE);
  t = new Timer(delay, this);
 }

 public void dropCube()
 {
  cube.start();
  t.start();
 }

 /**
  * Processes timer events
  */
 public void actionPerformed(ActionEvent e)
 {
  boolean moved = cube.moveDown();
  if (!moved) // "If not moved... "
  {
   t.stop();
  }
  repaint();
 }

 public void paintComponent(Graphics g)
 {
  super.paintComponent(g); // call JPanel's paintComponent
  cube.draw(g);
 }
}