Исходный текст программы ColorInterface.java

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

import java.applet.*;
import java.awt.*;

// ============================================
// ColorInterface
// ============================================
public class ColorInterface extends Applet
{
  DrawRect m_DrawRectThread = null;

  public String getAppletInfo()
  {
    return "Name: Color Rectangles";
  }

  public void paint(Graphics g)
  {
    Dimension dimAppWndDimension = size();
    
    g.setColor(Color.yellow);
    g.fillRect(0, 0, 
      dimAppWndDimension.width  - 1, 
      dimAppWndDimension.height - 1);

    g.setColor(Color.black);
    g.drawRect(0, 0, 
      dimAppWndDimension.width  - 1, 
      dimAppWndDimension.height - 1);
  }

  public void start()
  {
    if (m_DrawRectThread == null)
    {
      m_DrawRectThread = new DrawRect(this);
      m_DrawRectThread.start();
    }
  }
	
  public void stop()
  {
    if (m_DrawRectThread != null)
    {
      m_DrawRectThread.stop();
      m_DrawRectThread = null;
    }
  }
}

// ============================================
// DrawRect
// ============================================
class DrawRect extends Thread
{
  Graphics g;
  Dimension dimAppWndDimension;

  public DrawRect(Applet Appl)
  {
    g = Appl.getGraphics();
    dimAppWndDimension = Appl.size();
  }

  public void run()
  {
    MyColorRect rc = new MyColorRect();
    
    while (true)
    {
      rc.setRandomSize(dimAppWndDimension);
      rc.setRandomColor();
      rc.drawMyRect(g);
      
      try
      {
	Thread.sleep(50);
      }
      catch (InterruptedException e)
      {
	stop();
      }
    }
  }
}

// ============================================
// DrawMyRectangles
// ============================================
interface DrawMyRectangles
{
  void drawMyRect(Graphics g);
}

// ============================================
// RandomValue
// ============================================
interface RandomValue
{
  int getRandomValue(int maxValue);
}

// ============================================
// MyColorRect
// ============================================
class MyColorRect 
  extends MyRect 
  implements DrawMyRectangles
{
  protected Color rectColor;
  
  MyColorRect()
  {
    super();
    rectColor = Color.black;
  }
  
  public void setRandomColor()
  {
    int rColor, gColor, bColor;
    
    rColor = getRandomValue(255);
    gColor = getRandomValue(255);
    bColor = getRandomValue(255);
    
    rectColor = new Color(
      rColor, gColor, bColor);
  }
  
  public void drawMyRect(Graphics g)
  {
    g.setColor(rectColor); 
    g.fillRect(x, y, width, height);
  }
}

// ============================================
// MyRect
// ============================================
class MyRect 
  implements DrawMyRectangles, RandomValue
{
  protected int x;
  protected int y;
  protected int width;
  protected int height;
  
  MyRect()
  {
    x = y = width = height = 0;
  }
  
  public void setRandomSize(
    Dimension dimAppWndDimension)
  {
      x = getRandomValue(
        dimAppWndDimension.width);
      y = getRandomValue(
        dimAppWndDimension.height);
      
      width  = getRandomValue(
        dimAppWndDimension.width) / 2;
      height = getRandomValue(
        dimAppWndDimension.height) / 2;
  }
  
  public void drawMyRect(Graphics g)
  {
    g.fillRect(x, y, width, height);
  }
  
  public int getRandomValue(int maxValue)
  {
    return (int)(maxValue * Math.random());
  }
}

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