Alarm Clock using Java 2D

Question

Hey Guys,
I have built an analog clock in java using swing and gregorian calender. Now my professor wants me to add an alarm functionality to it. Any ideas of how to implement this into the already existing code. The folllowing is the code i have written so far..everything works except i dont know how to implement the alarm functionality. Assistance needed ASAP, as its due by this wednesday!!
/** Analog Clock using Java Graphics 2D Component */
import java.awt.*;
import java.awt.Graphics2D;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
/** Built on JPanel..Used class Timer for repeatedly executing
the clocktimer thread/
public class AnalogClock extends JPanel
ImageIcon img;
private GregorianCalendar m_calendar;
private int[] x=new int[2];
private int[] y=new int[2];
private java.util.Timer clocktimer=new java.util.Timer();
/**You could set the TimeZone for the clock here. I used the Dfault time
zone from the user so that every time the program runs on different
computers the correct time is displayed*/
private TimeZone clockTimeZone=TimeZone.getDefault();
//Constructor
public AnalogClock()
this.setPreferredSize(new Dimension(210,210));
this.setMinimumSize(new Dimension(210,210));
//schedules the clocktimer task to scan for every 1000ms=1sec
clocktimer.schedule(new TickTimerTask(),0,1000);
//The Clock Face instance method
public void paint(Graphics g)
g.setColor(Color.orange);
g.fillRect(0,0,this.getWidth(),this.getHeight());
drawCardinals((Graphics2D)g);
drawHands((Graphics2D)g);
//Endpoints of the Clock Hand
void clockMinutes(int startRadius,int endRadius,double theta)
theta-=Math.PI/2;
x[0]=(int)(getWidth()/2+startRadius*Math.cos(theta));
y[0]=(int)(getHeight()/2+startRadius*Math.sin(theta));
x[1]=(int)(getWidth()/2+endRadius*Math.cos(theta));
y[1]=(int)(getHeight()/2+endRadius*Math.sin(theta));
//The Hours/Cardinals of the clock
/** Set Stroke sets the thickness of the cardinals and hands*/
void drawCardinals(Graphics2D g)
g.setStroke(new BasicStroke(9));
g.setColor(Color.black);
for(double theta=0;theta<Math.PI*2;theta+=Math.PI/6)
clockMinutes(100,100,theta);
/**Draws a sequence of connected lines defined by arrays of x and
*y coordinates. Each pair of (x, y) coordinates defines a point.
*The figure is not closed if the first point
differs from the last point./
g.drawPolyline(x,y,2);
//The Hand of the Clocks instance method
public void drawHands(Graphics2D g)
double h=2*Math.PI*(m_calendar.get(Calendar.HOUR));
double m=2*Math.PI*(m_calendar.get(Calendar.MINUTE));
double s=2*Math.PI*(m_calendar.get(Calendar.SECOND));
g.setStroke(new BasicStroke(9));
clockMinutes(0,55,h/12+m/(60*12));
g.setColor(Color.red);
g.drawPolyline(x,y,2);
clockMinutes(0,70,m/60+s/(60*60));
g.setColor(Color.blue);
g.drawPolyline(x,y,2);
clockMinutes(0,70,s/60);
g.setColor(Color.black);
g.drawPolyline(x,y,2);
g.fillOval(getWidth()/2-8,getHeight()/2-8,16,16);
//method to update/refresh the clock every second
class TickTimerTask extends TimerTask
public void run()
m_calendar=(GregorianCalendar)GregorianCalendar.getInstance(clockTimeZone);
repaint();
The Main File is below:
import javax.swing.JFrame;
import java.awt.Toolkit;
public class AnalogClockView extends JFrame
public static void main(String[] args)
JFrame frame = new JFrame();
frame.setSize(300, 400);
frame.setTitle("My Java Project Clock");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setIconImage(Toolkit.getDefaultToolkit().getImage("Clock.gif"));
AnalogClock m_AnalogClock=new AnalogClock();
frame.add(m_AnalogClock);
frame.setVisible(true);
Edited by: sIrIUs_bLAcK on Aug 31, 2008 11:17 PM

Answer 1

some items unrelated to your main question:
*) When drawing in JPanels and other JComponents, you should override paintComponent, not paint. Also, the first method in this override should be super.paintComponent(g). This will refresh your screen and will eliminate the need for your having to fill the rectangle with a color on each iteration of paintComponent. You'll have to call setBackground(Color c) on your drawing JPanel somewhere in the initialization code though.
*) If you're using a Timer with Swing apps, consider using a Swing Timer. It works well and has the added convenience of having all code in it's actionlistener called on the event dispatch thread, the main Swing thread.
*) Finally, when posting your code, please use code tags so that your code will retain its formatting and be readable. To do this, you will need to paste already formatted code into the forum, highlight this code, and then press the "code" button at the top of the forum Message editor prior to posting the message. You may want to click on the Preview tab to make sure that your code is formatted correctly. Another way is to place the tag &#91;code] at the top of your block of code and the tag &#91;/code] at the bottom, like so:
&#91;code]
  // your code block goes here.
  // note the differences between the tag at the top vs the bottom.
&#91;/code]or
{&#99;ode}
  // your code block goes here.
  // note here that the tags are the same.
{&#99;ode}Edited by: Encephalopathic on Aug 31, 2008 5:29 PM