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

/** Similar to DisplayTextApplet, but with animation */
public class FloatTextApplet extends FlickerFreeApplet implements Runnable {
    private Font f;
    private FontMetrics  fm;

    private String msg;
    private    int msgWidth, msgHeight;
    private Dimension d;
    private int ascent;

    private double x,y,dx,dy,mx,my;

    boolean die = false;
    public void init() {
        String fontName = getParameter("fontName");
        if (fontName == null) fontName="TimesRoman";
        System.out.println("Fontname: " + fontName);
        int fontSize = Integer.getInteger("fontSize",18).intValue();
        System.out.println("Fontsize: " + fontSize);
        msg = getParameter("message");
        if (msg == null) msg="Hello World!";
        System.out.println("msg: " + msg);

        f = new Font(fontName,Font.BOLD,fontSize);
        setFont(f);
        System.out.println("font: " + f);
        fm = getFontMetrics(f);
        msgWidth = fm.stringWidth(msg);
        ascent = fm.getAscent();
        msgHeight = ascent + fm.getDescent();
        d = size();

        mx = d.width - msgWidth;
        my = d.height - msgHeight;
        x =  Math.random() * mx;
        y =  Math.random() * my;

        dx = Math.random() * 6 - 3;
        dy = Math.random() * 6 - 3;
        new Thread(this).start();
    }

    public void  run() {
        while (!die) {
            try { Thread.sleep(150); }
            catch (InterruptedException e) { };
            synchronized(this) {
                d = size();

                mx = d.width - msgWidth;
                my = d.height - msgHeight;
                x += dx;
                y += dy;
                dy += 0.1;
                if (x < 0) {
                    x = -x;
                    dx = -dx + Math.random()*2-1;
                }
                else if (x > mx) {
                    x = 2*mx-x;
                    dx = -dx + Math.random()*2-1;
                }
                if (y < 0) {
                    y = -y;
                    dy = -dy + Math.random()*2-1;
                }
                else if (y > my) {
                    y = 2*my-y;
                    dy = -dy + Math.random()*2-1;
                }
                repaint();
            }
        }
    }

    public void destroy() {
        die = true;
    }

    public synchronized void paint(Graphics g)
    {
        g.setColor(Color.red);
        g.drawString(msg, (int) x, (int) y+ascent);

    }
}