小时钟
/** * author zjsrustar */ //package MainPackage; import javax.swing.*; import java.awt.*; import java.awt.geom.*; import java.awt.event.*; import java.util.Calendar; import java.util.GregorianCalendar; /** * This is the main Function of the program. */ public class Clock{ public static void main(String []args){ ClockFrame frame = new ClockFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } /** * This class is used to define the main frame of the clock */ class ClockFrame extends JFrame{ //constructor function public ClockFrame(){ setTitle("小时钟"); setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); setLocation(DEFAULT_LOC_WIDTH, DEFAULT_LOC_HEIGHT); ClockPanel panel = new ClockPanel(); add(panel); } //variables of the frame private int DEFAULT_LOC_WIDTH = 300; private int DEFAULT_LOC_HEIGHT = 300; private int DEFAULT_WIDTH = 330; private int DEFAULT_HEIGHT = 330; } /** * This class is used to defind the main panel of the clock */ class ClockPanel extends JPanel{ public void paintComponent(Graphics g){ super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; //get the time of the system GregorianCalendar calendar = new GregorianCalendar(); int hour = calendar.get(Calendar.HOUR); int minute = calendar.get(Calendar.MINUTE); int second = calendar.get(Calendar.SECOND); //draw the clock face Ellipse2D clockFace = new Ellipse2D.Double(); clockFace.setFrameFromCenter(CENTER_X, CENTER_Y, CENTER_X+RADIUS, CENTER_Y+RADIUS); g2.setColor(Color.BLUE); g2.draw(clockFace); //draw the clock center Ellipse2D clockCenter = new Ellipse2D.Double(); clockCenter.setFrameFromCenter(CENTER_X, CENTER_Y, CENTER_X+INNER_RADIUS, CENTER_Y+INNER_RADIUS); g2.setColor(Color.RED); g2.fill(clockCenter); //help to get the exact position of the lines double lenX, lenY, posX, posY; //draw the clock second line Line2D clockSecond = new Line2D.Double(); double secondTime = (double) calendar.get(Calendar.SECOND); lenX = SECOND_LEN*Math.sin(2*Math.PI*secondTime/60.0); lenY = SECOND_LEN*Math.cos(2*Math.PI*secondTime/60.0); posX = CENTER_X + lenX; posY = CENTER_Y - lenY; clockSecond.setLine(CENTER_X, CENTER_Y, posX, posY); g2.setColor(Color.PINK); g2.draw(clockSecond); //draw the clock minute line Line2D clockMinute = new Line2D.Double(); double minuteTime = (double) calendar.get(Calendar.MINUTE); lenX = MINUTE_LEN*Math.sin(2*Math.PI*(secondTime+60*minuteTime)/3600.0); lenY = MINUTE_LEN*Math.cos(2*Math.PI*(secondTime+60*minuteTime)/3600.0); posX = CENTER_X + lenX; posY = CENTER_Y - lenY; clockMinute.setLine(CENTER_X, CENTER_Y, posX, posY); g2.setColor(Color.GREEN); g2.draw(clockMinute); //draw the clock hour line Line2D clockHour = new Line2D.Double(); double hourTime = (double) calendar.get(Calendar.HOUR); lenX = HOUR_LEN*Math.sin(2*Math.PI*((secondTime+60*minuteTime+3600*hourTime)/43200.0)); lenY = HOUR_LEN*Math.cos(2*Math.PI*((secondTime+60*minuteTime+3600*hourTime)/43200.0)); posX = CENTER_X + lenX; posY = CENTER_Y - lenY; clockHour.setLine(CENTER_X, CENTER_Y, posX, posY); g2.setColor(Color.BLUE); g2.draw(clockHour); int delay = 1000; // actionListener ActionListener drawClock; drawClock=new ActionListener(){ public void actionPerformed(ActionEvent evt){ repaint(); } }; //create timer new Timer(delay, drawClock).start(); } //variables of the panel private int HOUR_LEN = 50; private int MINUTE_LEN = 70; private int SECOND_LEN = 90; private int RADIUS = 100; private int INNER_RADIUS = 2; private int CENTER_X = 150; private int CENTER_Y = 150; }