Исходный текст программы MouseBox.java

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// ==========================================
// MouseBox.java
//(C) Alexandr Frolov, 1998
// E-mail: frolov@glasnet.ru
// Web:    http://www.glasnet.ru/~frolov 
// ==========================================

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

public class MouseBox extends Applet 
  implements MouseListener
{
  Dimension dm;
  int nxBlockSize;
  int nyBlockSize;
  static final int nBlocks = 10;
  
  boolean[][] bState;
  int[][] nClickCount;
  int[][] nMod;
  
  // ============================================
  // init
  // ============================================
  public void init()
  {
    int i, j;
    
    dm = getSize();
    
    nxBlockSize = dm.width / nBlocks;
    nyBlockSize = dm.height / nBlocks;
    
    bState = new boolean[nBlocks][nBlocks];
    nClickCount = new int[nBlocks][nBlocks];
    nMod = new int[nBlocks][nBlocks];
    
    for(i = 0; i < nBlocks; i++)
    {
      for(j = 0; j < nBlocks; j++)
      {
	bState[i][j] = false;
	nClickCount[i][j] = 0;
	nMod[i][j] = 0;
      }
    }  
    
    setBackground(Color.yellow);
    setForeground(Color.black);
    
    this.addMouseListener(this);
  }
  
  // ============================================
  // getAppletInfo
  // ============================================
  public String getAppletInfo()
  {
    return "Name: MouseBox";
  }
  
  // ============================================
  // paint
  // ============================================
  public void paint(Graphics g)
  {
    g.setColor(Color.red);
    
    for(int x = 0; x <= nBlocks; x++)
    {
      g.drawLine(x * nxBlockSize, 0,
	x * nxBlockSize, dm.height);
    }
    
    for(int y = 0; y <= nBlocks; y++)
    {
      g.drawLine(0, y * nyBlockSize,
	dm.width, y * nyBlockSize);
    }
    
    for(int x = 0; x < nBlocks; x++)
    {
      for(int y = 0; y < nBlocks; y++)
      {
	if(nClickCount[x][y] == 2)
          g.setColor(Color.red);
	  
        else if(bState[x][y])
	{
	  if(nClickCount[x][y] == 2)
            g.setColor(Color.red);
	    
	  else
	  {  
  	    if(nMod[x][y] == InputEvent.META_MASK)
              g.setColor(Color.black);
	    else  
              g.setColor(Color.green);
	  }  
	}
	else
          g.setColor(Color.yellow);
	  
        g.fillRect(
          x * nxBlockSize + 1,
          y * nyBlockSize + 1,
	  nxBlockSize - 1, nyBlockSize - 1);
      }
    }  	
  }
  
  // ============================================
  // mousePressed
  // ============================================
  public void mousePressed(MouseEvent e)
  {
    int xClick = e.getX() / nxBlockSize;
    int yClick = e.getY() / nyBlockSize;
    
    bState[xClick][yClick] = 
      !bState[xClick][yClick];

    nClickCount[xClick][yClick] = 
      e.getClickCount();
    
    nMod[xClick][yClick] = e.getModifiers();
    
    repaint();
  }

  // ============================================
  // mouseReleased
  // ============================================
  public void mouseReleased(MouseEvent e)
  {
  }
  
  // ============================================
  // mouseClicked
  // ============================================
  public void mouseClicked(MouseEvent e)
  {
  }
  
  // ============================================
  // mouseEntered
  // ============================================
  public void mouseEntered(MouseEvent e)
  {
  }
  
  // ============================================
  // mouseExited
  // ============================================
  public void mouseExited(MouseEvent e)
  {
  }
}

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