// jclock.java
//  A java clock.  How cliché.
//  Takes parameters "pointsize" and "fontname" from HTML.
//  I used thread/sleep.  I don't suppose there's a timer event.
//
//  This software comes with NO WARRANTY whatsoever.
//  It may be used as "free software" per the GNU GPL.
//  See http://www.gnu.org/copyleft/gpl.html for license information.
//  Copyright 1999 Demetri Patukas.   rev 99.06.19

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

public class jclock extends Applet {

/// ----- instance vars
private int ptsize = 18;
private String fontname = "Helvetica";
private Graphics ggg;
private Font font;
private CClock clk_thread;

/// ----- applet handlers

public void init() {
    ggg = this.getGraphics();
}

public void start() {
    String str;
    str = this.getParameter("pointsize");
    if (str != null) {
	Integer ii2 = new Integer(str);
	ptsize = ii2.intValue();
	ii2 = null;
    }
    str = this.getParameter("fontname");
    if (str != null) fontname = str;
    font = new Font(fontname, Font.BOLD, ptsize);
    ggg.setFont(font);
    clk_thread = new CClock();
    clk_thread.start();
}
public void stop() {
    clk_thread.runflag = false;
    clk_thread = null;
}

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

/// ----- private helpers

private String digits2(int x) {
    return ((x < 10) ? "0":"") + x;
}

private void update_clock() {
    ggg.clearRect(0, 0, 400, 50);
    Date dt = new Date();
    String str = "";
    str += digits2(dt.getHours()) + ":";
    str += digits2(dt.getMinutes()) + ":";
    str += digits2(dt.getSeconds());
    str += " ";
    str += digits2(dt.getMonth()+1) + "/";
    str += digits2(dt.getDate()) + "/";
    str += digits2(dt.getYear() % 100);
    ggg.drawString(str, 10, ptsize);
    dt = null;
}

/// ----- local class definition for clock thread.
private class CClock extends Thread {
    boolean runflag;
    public void run() {
	runflag = true;
	while (runflag) {
	    update_clock();
	    try this.sleep(1000);
	    catch (InterruptedException e) {
	    }
	}
    }
    // When thread.run returns, the thread is (apparently)
    // destroyed. (cannot just be restarted)
} /// ----- end local class CClock


} //end class jclock