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

public class ticker6 extends Applet implements Runnable
{
    String      myText;
    Thread      myThread;
    Font        myFont;
    FontMetrics myMetrics;
    Image       myImage;
    Graphics    myOffsceenGraphics;
    Color       myColor;

    int         myTextLength;
    int         XCoord = 0;
    int         mySleepPeriod = 50;
    int         myAdvance = 2;
    boolean     myThreadStopped = false;

    Button Stop = new Button("Stop");
    Button Start = new Button("Start");

    public void init()
    {
        myText=getParameter("text");
        myThread = null;
        myThreadStopped = false;
        myFont = new Font("Helvetica",1,24);
        myMetrics = getFontMetrics(myFont);
        myTextLength = myMetrics.stringWidth(myText);
        myColor = Color.blue;
        myImage = createImage(size().width,size().height);
        myOffsceenGraphics = myImage.getGraphics();

        setLayout(new BorderLayout());
        Panel myPanel = new Panel();
        myPanel.setLayout(new FlowLayout());
        myPanel.add(Start);
        myPanel.add(Stop);
        add("South",myPanel);  
    }
   
    public void newCoordinates()
    {
        if (XCoord < -myTextLength)
        {
            XCoord = size().width;
        }
        else
        {
            XCoord = XCoord - myAdvance;
        }
    }

    public void start()
    {
       if (myThread == null)
       {
          myThread = new Thread(this,"MyThread");
          myThread.start();
       }
    }

    public void run()
    {
        while (myThread != null)
        {
           try 
           {
              myThread.sleep(mySleepPeriod);
           }
           catch (InterruptedException e)
           {}
           newCoordinates();
           repaint();
        }
    }

    public void updateImage(Graphics g)
    {
        g.setColor(Color.black);
        g.fillRect(0,0,size().width, size().height);
        g.setColor(myColor);
        g.setFont(myFont);
        g.drawString(myText,XCoord,25);
    }

    public void update(Graphics g)
    {
         paint(g);
    }

    public void paint(Graphics g)
    {
	updateImage(myOffsceenGraphics);
        g.drawImage(myImage,0,0,null);
    }

    public void stop()
    {
       myThread.stop();
       myThread = null;
    }

    public boolean mouseDown(Event e, int x, int y)
    {
       if (myThreadStopped)
       {  
           myThread.resume();
           myThreadStopped = false;
       }
       else
       {
           myThread.suspend();
           myThreadStopped = true;
       }
       return true;
    }       

    public boolean action(Event e, Object arg)
    {
       if (("Stop".equals(arg)) && (!myThreadStopped))
       {
          myThread.suspend();
          myThreadStopped = true;
       }
       if (("Start".equals(arg))  && (myThreadStopped))
       {
          myThread.resume();
          myThreadStopped = false;
       }
       return true;
    }
}