How to Make Analog Clock using Java - Java Source Code for Analog Clock - TechEarnBlog

Saturday, June 23, 2018

How to Make Analog Clock using Java - Java Source Code for Analog Clock

How to Make Analog Clock in Java Swing

For my computer graphics project, I had to create an analog clock using java swing. In this article I'm going to provide source code of an analog clock. For making an analog clock using java we need to use the Thread and Graphics classes of Java. The threading is used to move the seconds, minutes and hours hands and the Graphic class is used to draw a lines and oval and to fill the color. computer graphics project
Analog Clock using Java - Java Source Code for Analog Clock

Analog Clock using Java - Java Source Code for Analog Clock


package analogclock;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.util.TimerTask;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 *
 * @author Ashutosh Sharma
 */
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);
}

public static void main(String[] args)
{
  JFrame frame = new JFrame();
  frame.setSize(300, 400);
  frame.setTitle("Analog Clock");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  AnalogClock m_AnalogClock=new AnalogClock();
  frame.add(m_AnalogClock);
  frame.setVisible(true);  
}

//The Clock Face instance method
public void paint(Graphics g)
{
  g.setColor(Color.WHITE);
  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.setStroke(new BasicStroke(12));
  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.BLACK);
  g.drawPolyline(x,y,2);

  clockMinutes(0,70,m/60+s/(60*60));
  g.setColor(Color.black);
  g.drawPolyline(x,y,2);

  clockMinutes(0,70,s/60);
  g.setColor(Color.red);
  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();
  }
 }
}

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