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package chapter17;
/* ClockApplet.java */
/* An Applet Program that displays time and date in both analog and digital format */
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.text.*;
public class ClockApplet 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(); Not needed anymore
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);
}
}