I have the following classes:

import java.awt.*; import java.awt.geom.*; import javax.swing.*; import java.util.*; /** A Clock face */ public class ClockFace extends JPanel { /** Constructs a Clock @param x the left of the bounding rectangle @param y the top of the bounding rectangle @param width the width of the bounding rectangle */ public ClockFace(int x, int y, int width) { this.x = x; this.y = y; this.width = width; this.setOpaque(false); this.setPreferredSize(new Dimension(width, width)); }

public void translate(int dx, int dy) { x += dx; y += dy; }

public void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D) g; super.paintComponent(g2); // draw the ticks int tickLen = 10; int medTickLen = 15; int longTickLen = 20; int r = width/2; //radius of clock int cX = x+(width)/2; int cY = y+(width)/2; Stroke tickStroke = new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND, 1f); GeneralPath ticksPath = new GeneralPath(); Ellipse2D.Double clockFace = new Ellipse2D.Double(this.x,this.y,width, width); g2.setColor(Color.WHITE); g2.fill(clockFace); for ( int i=1; i<= 60; i++){ // default tick length is short int len = tickLen; if ( i % 15 == 0 ){ // Longest tick on quarters (every 15 ticks) len = longTickLen; } else if ( i % 5 == 0 ){ // Medium ticks on the '5's (every 5 ticks) len = medTickLen; }

double di = (double)i; // tick num as double for easier math // Get the angle from 12 O'Clock to this tick (radians) double angleFrom12 = di/60.0*2.0*Math.PI; // Get the angle from 3 O'Clock to this tick // Note: 3 O'Clock corresponds with zero angle in unit circle // Makes it easier to do the math. double angleFrom3 = Math.PI/2.0-angleFrom12; // Move to the outer edge of the circle at correct position // for this tick. ticksPath.moveTo( (float)(cX+Math.cos(angleFrom3)*r), (float)(cY-Math.sin(angleFrom3)*r) ); // Draw line inward along radius for length of tick mark ticksPath.lineTo( (float)(cX+Math.cos(angleFrom3)*(r-len)), (float)(cY-Math.sin(angleFrom3)*(r-len)) ); } // Draw the full shape onto the graphics context. g2.setColor(Color.BLACK); g2.setStroke(tickStroke); g2.draw(ticksPath); g2.setColor(Color.RED); for ( int i=1; i<=12; i++){ String numStr = ""+i; FontMetrics fm = g2.getFontMetrics(g2.getFont()); int charWidth = fm.stringWidth(numStr); int charHeight = fm.getHeight(); double di = (double)i; double angleFrom12 = di/12.0*2.0*Math.PI; double angleFrom3 = Math.PI/2.0-angleFrom12; int tx = (int)(Math.cos(angleFrom3)*(r-longTickLen-charWidth)); int ty = (int)(-Math.sin(angleFrom3)*(r-longTickLen-charHeight)); g2.drawString(numStr, (int)cX+tx, (int)cY+ty); } } private int x; private int y; private int width; }

Also:

import java.awt.Graphics;

public class ClockHand implements MoveableShape {

@Override public void draw(Graphics g2) { // TODO Auto-generated method stub }

@Override public void translate(int dx, int dy) { // TODO Auto-generated method stub } }

Also:

import java.awt.*; import java.awt.event.*; import javax.swing.*; /** This program implements an animation that moves a car shape. */ public class ClockTester { public static void main(String[] args) { JFrame frame = new JFrame(); ClockFace icon = new ClockFace(0, 0, CLOCK_RADIUS); frame.setLayout(new BorderLayout()); frame.add(icon, BorderLayout.CENTER); JPanel topNav = new JPanel(new FlowLayout()); topNav.add(new JButton("clock")); topNav.add(new JButton("stopwatch")); frame.add(topNav, BorderLayout.NORTH); icon.repaint(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); } private static final int CLOCK_RADIUS = 500; }

and Finally:

import java.awt.*; /** A shape that can be moved around. */ public interface MoveableShape { /** Draws the shape. @param g2 the graphics context */ void draw(Graphics g2); /** Moves the shape by a given amount. @param dx the amount to translate in x-direction @param dy the amount to translate in y-direction */ void translate(int dx, int dy); }

My question is, I am trying to draw the hands of the clock in the ClockHand class. However, I am not sure exactly on how to pass the Graphics2D variable to this class to actually print. What is the correct way to pass this value so that I can print in my ClockHand class?

Thanks