// "Counter0.java" Java Counter0 Ver1.10 1999,Feb,06
// copyright: Hiroyuki Murata <faichan@kt.rim.or.jp>
import java.awt.*;
import java.applet.Applet;

public class Counter0 extends Applet implements Runnable {

    Thread thread;
    int digit;
    int Width,Height,charWidth,osW,osH;
    Font font;
    FontMetrics metrics;
    Image ioff;
    Graphics goff;
    String strCount;
    char[] charCount;

    public void init() {

        String strCount_ = getParameter("count");
        if (strCount_ == null)
            strCount_ = getParamStr("name", "0");
        digit = getParamInt("digit", 4);
        Color bgColor = getParamCol("bgcolor", 0);
        String fontname = getParamStr("fontname", "TimesRoman");
        int fontstyle = getParamInt("fontstyle", 1);
        int fontsize = getParamInt("fontsize", 30);

        charCount = new char[digit];

        for (int i=0; i<digit; i++) {
            int j = i - (digit - strCount_.length());
            if (j<0) charCount[i] = '0';
            else     charCount[i] = strCount_.charAt(j);
        }
        strCount = new String(charCount);

        font = new Font(fontname, fontstyle, fontsize);
        metrics = getFontMetrics(font);

        Width = size().width;
        Height = size().height;
        charWidth = Width / digit;
        osW = (charWidth  - metrics.charWidth('0')) / 2;
        osH = Height - metrics.getDescent();

        resize(Width,Height);
        ioff = createImage(Width,Height);
        goff = ioff.getGraphics();

        goff.setColor(bgColor);
        goff.fillRect(0,0,Width,Height);
        goff.setFont(font);
    }

    //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    String getParamStr(String name, String defaultString) {
        String ret = getParameter(name);
        if (ret == null) {
            ret = defaultString;
        }
        return ret;
    }

    int getParamInt(String name, int defaultValue) {
        try {
            return new Integer(getParameter(name)).intValue();
        } catch (RuntimeException e) {
            return defaultValue;
        }
    }

    Color getParamCol(String name, int defaultCol) {
        try {
            return new Color(Integer.parseInt(getParameter(name), 16));
        } catch (RuntimeException e) {
            return new Color(defaultCol);
        }
    }

    //-----------------------------------------------------------
    public void start() {
        if (thread == null) {
            thread = new Thread(this);
            thread.start();
        }
    }
    
    public void stop() {
        if (thread != null) {
            thread.stop();
            thread = null;
        }
    }

    public void run() {
        while (thread.isAlive()) {
            repaint();
            try {
                thread.sleep(100);
            } catch (InterruptedException e) {
                break;
            }
        }
    }

    //-----------------------------------------------------------
    public void update(Graphics g) {
        for (int i=0; i<digit; i++) {
            goff.setColor(new Color(irand(256),irand(256),irand(256)));
            goff.drawString(strCount.substring(i,i+1), charWidth*i+osW, osH);
        }
        paint(g);
    }

    public void paint(Graphics g) {
        g.drawImage(ioff,0,0,this);
    }

    //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    int irand(int n) {
        return (int)(Math.random()*n);
    }
}
/*************************************************************************/