Исходный текст программы Sinus.java

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

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

public class Sinus extends Applet
{
  DrawSinus m_DrawSinusThread = null;

  public String getAppletInfo()
  {
    return "Name: 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_DrawSinusThread == null)
    {
      m_DrawSinusThread = new DrawSinus(this);
      m_DrawSinusThread.start();
    }
  }
	
  public void stop()
  {
    if (m_DrawSinusThread != null)
    {
      m_DrawSinusThread.stop();
      m_DrawSinusThread = null;
    }
  }
}

class DrawSinus extends Thread
{
  Graphics g;
  Dimension dimAppWndDimension;

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

  public void run()
  {
    while (true)
    {
      int nPoints = dimAppWndDimension.width;
      int[] xPoints = new int[nPoints];
      int[] yPoints = new int[nPoints];
      int rColor, gColor, bColor;
      
      int maxAngle = (int)((30 * Math.PI) *
	Math.random());
      
      int Amplitude = 
	(int)(dimAppWndDimension.height * 
	Math.random());
	
      int Offset = 
	(int)(dimAppWndDimension.height * 
	Math.random());
	
      double deltaFi = (Math.PI / 2) * 
	Math.random();
      
      for(int i=0; i < nPoints; i++)
      {
	xPoints[i] = i;
	yPoints[i] = Offset + (int)(Amplitude * 
	  Math.sin(deltaFi + 
	  (double)((maxAngle * i)) / nPoints)); 
      }
      
      rColor = (int)(255 * Math.random());
      gColor = (int)(255 * Math.random());
      bColor = (int)(255 * Math.random());
      g.setColor(new Color(
        rColor, gColor, bColor));
      
      g.fillPolygon(xPoints, yPoints, nPoints);
      
      try
      {
	Thread.sleep(300);
      }
      catch (InterruptedException e)
      {
	stop();
      }
    }
  }
}

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