import java.applet.Applet;
import java.awt.*;
import java.util.Random;


public class sincos extends Applet implements Runnable {

  // Line Colour
  Color color = new Color(94,60,10);
  Color bgcolor = Color.red;
  int xpos=0, y;
  int oldx, oldy;
  int i =0;
  int width, height;
  Thread killme=null;
  Image osImage;
  Graphics osGraphics;
  boolean suspended = false;
  long seed = 8273;
  Random rnum = new Random(seed);

public void init() 
	{
	width = size().width;
  	height = size().height;
  	y = height/2;
	
	if(bgcolor != null)
			{ 

       			 setBackground(bgcolor);

      			 }
		else
			{

        		 setBackground(new Color(255,255,0));

       			}
	
	}

public void paint(Graphics osg) 
	{
  	osg.setColor(color);

  	if (xpos > (width-5)) 
		{
    		osg.drawLine(width-5,oldy, width-5, y);
  		} 
		else 
		{
    		osg.drawLine(oldx, oldy, xpos, y);
  		}
	}

public void start() 
	{
  	if(killme == null) 
		{
    		killme = new Thread(this);
    		killme.start();
  		}
	}

// -------------------------------------------- //
//						//
//		MATHEMATICS ROUTINES		//
//						//
// ---------------------------------------------//

public void gettandata() 
	{
  	oldx = xpos;
  	oldy = y;
  	xpos = xpos+1;
  	y =(int)((Math.sin((double)xpos/10) + height/10)*(Math.cos((double)xpos/5) + height/10));

		// Casting associates right, same precedence as *.
  		//  System.out.print(""+xpos+" ");
  		//  System.out.println(""+y);
	}

public void getrandata()  {
oldx = xpos;
oldy = y;
xpos = xpos + 1;
y = (int)(rnum.nextFloat()*30 + height/2);
//   System.out.print(""+xpos+" ");
//   System.out.println(""+y);
}



public void run()
	{
  	while(killme!=null) 
		{
    		try { Thread.sleep(50); }
   		 	catch (InterruptedException e) {}
    			gettandata();      
		//    getrandata();
    			repaint();
  		}
	}  // Close run().


// -------------------------------------------- //
//						//
//		GRAPHICS DISPLAY		//
//						//
// ---------------------------------------------//

public void update(Graphics g) 
	{
  	if(osImage == null)
    		osImage=createImage(size().width,size().height);
  		osGraphics=osImage.getGraphics();

  	if (xpos>width) 
		{
    		osGraphics.copyArea(1, 0, width, height, -1, 0);
    		osGraphics.clipRect(0, 0, width, height); // (1)
  		} // Close x > width.
  	paint(osGraphics);
  	g = this.getGraphics();
  
	if (xpos>width) 
		{ 
    		g.drawImage(osImage, 0,0,this); //  (1)
   		 osGraphics.dispose();
 		}  // Close if.
  		else 
		{
   		g.drawImage(osImage, 0,0, this);
    		osGraphics.dispose();
 		} // Close if/else.
	}  // Close update().

// -------------------------------------------- //
//						//
//		MOUSE EVENTS			//
//						//
// ---------------------------------------------//

public boolean handleEvent(Event evt) 
	{
 	 if(evt.id==Event.MOUSE_DOWN) 
		{
   		 if (suspended) 
			{
      				killme.resume();
   			}
			else 
			{
      				killme.suspend();
    			}
    			suspended = !suspended;
  		}
  		return true;
	}  // Close handleEvent().

public void stop() 
	{
 	 if (killme != null) killme.stop();
  	 killme= null;
	} // Close stop().

} // Close sincos.class