import java.awt.*;

public class Pan2 extends javax.swing.JApplet
    implements Runnable {

    Thread runner;
    Image back, fore, workspace;
    Graphics offscreen;
    String text;
    String fontName;
    int direction = 1;
    int fontSize = 24;
    int x1 = 0;
    int x2;

    public void init() {
        workspace = createImage(getSize().width, getSize().height);
        offscreen = workspace.getGraphics();
        // get parameters
        String imageBack = getParameter("background");
        if (imageBack != null)
            back = getImage(getDocumentBase(), imageBack);
        String imageFore = getParameter("foreground");
        if (imageFore != null)
            fore = getImage(getDocumentBase(), imageFore);
        x2 = getSize().width;
        text = getParameter("text");
        fontName = getParameter("font");
        if (fontName == null)
            fontName = "Arial";
        String param = getParameter("fontsize");
        if (param != null)
            fontSize = Integer.parseInt("0" + param);
        String dirParam = getParameter("direction");
        if (dirParam.equals("left"))
            direction = 1;
        else
            direction = -1;
    }

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

    public void stop() {
        if (runner != null) {
            runner = null;
        }
    }

    public void run() {
        Thread thisThread = Thread.currentThread();
        while (runner == thisThread) {
            repaint();
            try { Thread.sleep(200); }
            catch (InterruptedException e) {}
            x1 = x1 - direction;
            x2 = x2 - direction;
            if (direction == 1) {
                if (x1 <= (getSize().width * -1))
                    x1 = getSize().width;
                if (x2 <= (getSize().width * -1))
                    x2 = getSize().width;
            } else {
                if (x1 >= getSize().width)
                    x1 = getSize().width * -1;
                if (x2 >= getSize().width)
                    x2 = getSize().width * -1;
            }    
        }
    }

    public void paint(Graphics screen) {
        Graphics2D screen2D = (Graphics2D) screen;
        offscreen.drawImage(back, x1, 0, null);
        offscreen.drawImage(back, x2, 0, null);
        if (fore != null)
            offscreen.drawImage(fore, 0, 0, null);
        if (text != null) {
            offscreen.setColor(Color.black);
            Font f = new Font(fontName, Font.BOLD, fontSize);
            FontMetrics fm = getFontMetrics(f);
            offscreen.setFont(f);
            int xStart = (getSize().width - fm.stringWidth(text)) / 2;
            int yStart = getSize().height/2 + fm.getHeight()/4;
            offscreen.drawString(text, xStart, yStart);
            offscreen.setColor(Color.white);
            offscreen.drawString(text, xStart-2, yStart-2);
        }
        screen2D.drawImage(workspace, 0, 0, this);
    }

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