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PC World 1998 October
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JSAMPLES.Z
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Clock2.java
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1998-05-08
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/*
* @(#)Clock2.java 1.6 96/12/06
*
* Copyright (c) 1994-1996 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
// author: Rachel Gollub, 1995
// modified 96/04/24 Jim Hagen : use getBackground()
// modified 96/05/29 Rachel Gollub : add garbage collecting
// modified 96/10/22 Rachel Gollub : add bgcolor, fgcolor1, fgcolor2 params
// modified 96/12/05 Rachel Gollub : change copyright and Date methods
// Time!
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
public class Clock2 extends Applet implements Runnable {
Thread timer = null;
int lastxs=0, lastys=0, lastxm=0, lastym=0, lastxh=0, lastyh=0;
Date dummy = new Date();
GregorianCalendar cal = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("EEE MMM dd HH:mm:ss yyyy");
String lastdate = df.format(dummy);
Font F = new Font("TimesRoman", Font.PLAIN, 14);
Date dat = null;
Color fgcol = Color.blue;
Color fgcol2 = Color.darkGray;
public void init() {
int x,y;
try {
setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),16)));
} catch (Exception E) { }
try {
fgcol = new Color(Integer.parseInt(getParameter("fgcolor1"),16));
} catch (Exception E) { }
try {
fgcol2 = new Color(Integer.parseInt(getParameter("fgcolor2"),16));
} catch (Exception E) { }
resize(300,300); // Set clock window size
}
// Plotpoints allows calculation to only cover 45 degrees of the circle,
// and then mirror
public void plotpoints(int x0, int y0, int x, int y, Graphics g) {
g.drawLine(x0+x,y0+y,x0+x,y0+y);
g.drawLine(x0+y,y0+x,x0+y,y0+x);
g.drawLine(x0+y,y0-x,x0+y,y0-x);
g.drawLine(x0+x,y0-y,x0+x,y0-y);
g.drawLine(x0-x,y0-y,x0-x,y0-y);
g.drawLine(x0-y,y0-x,x0-y,y0-x);
g.drawLine(x0-y,y0+x,x0-y,y0+x);
g.drawLine(x0-x,y0+y,x0-x,y0+y);
}
// Circle is just Bresenham's algorithm for a scan converted circle
public void circle(int x0, int y0, int r, Graphics g) {
int x,y;
float d;
x=0;
y=r;
d=5/4-r;
plotpoints(x0,y0,x,y,g);
while (y>x){
if (d<0) {
d=d+2*x+3;
x++;
}
else {
d=d+2*(x-y)+5;
x++;
y--;
}
plotpoints(x0,y0,x,y,g);
}
}
// Paint is the main part of the program
public void paint(Graphics g) {
int xh, yh, xm, ym, xs, ys, s, m, h, xcenter, ycenter;
String today;
dat = new Date();
cal.setTime(dat);
// cal.computeFields();
s = (int)cal.get(Calendar.SECOND);
m = (int)cal.get(Calendar.MINUTE);
h = (int)cal.get(Calendar.HOUR_OF_DAY);
today = df.format(dat);
xcenter=80;
ycenter=55;
// a= s* pi/2 - pi/2 (to switch 0,0 from 3:00 to 12:00)
// x = r(cos a) + xcenter, y = r(sin a) + ycenter
xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 45 + xcenter);
ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 45 + ycenter);
xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 40 + xcenter);
ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 40 + ycenter);
xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + xcenter);
yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + ycenter);
// Draw the circle and numbers
g.setFont(F);
g.setColor(fgcol);
circle(xcenter,ycenter,50,g);
g.setColor(fgcol2);
g.drawString("9",xcenter-45,ycenter+3);
g.drawString("3",xcenter+40,ycenter+3);
g.drawString("12",xcenter-5,ycenter-37);
g.drawString("6",xcenter-3,ycenter+45);
// Erase if necessary, and redraw
g.setColor(getBackground());
if (xs != lastxs || ys != lastys) {
g.drawLine(xcenter, ycenter, lastxs, lastys);
g.drawString(lastdate, 5, 125);
}
if (xm != lastxm || ym != lastym) {
g.drawLine(xcenter, ycenter-1, lastxm, lastym);
g.drawLine(xcenter-1, ycenter, lastxm, lastym); }
if (xh != lastxh || yh != lastyh) {
g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
g.drawLine(xcenter-1, ycenter, lastxh, lastyh); }
g.setColor(fgcol2);
g.drawString(today, 5, 125);
g.drawLine(xcenter, ycenter, xs, ys);
g.setColor(fgcol);
g.drawLine(xcenter, ycenter-1, xm, ym);
g.drawLine(xcenter-1, ycenter, xm, ym);
g.drawLine(xcenter, ycenter-1, xh, yh);
g.drawLine(xcenter-1, ycenter, xh, yh);
lastxs=xs; lastys=ys;
lastxm=xm; lastym=ym;
lastxh=xh; lastyh=yh;
lastdate = today;
dat=null;
}
public void start() {
if(timer == null)
{
timer = new Thread(this);
timer.start();
}
}
public void stop() {
timer = null;
}
public void run() {
while (timer != null) {
try {Thread.sleep(100);} catch (InterruptedException e){}
repaint();
}
timer = null;
}
public void update(Graphics g) {
paint(g);
}
}