Java アナログ時計 ソースコード: tukasa blog

// -*- mode:java; encoding:utf-8 -*-

// vim:set fileencoding=utf-8:

// https://ateraimemo.com/Swing/AnalogClock.html

//package example;

import java.awt.*;

import java.awt.geom.AffineTransform;

import java.awt.geom.Ellipse2D;

import java.awt.geom.Line2D;

import java.time.LocalTime;

import java.time.ZoneId;

import javax.swing.*;

public final class MainPanel extends JPanel {

  private MainPanel() {

    super(new BorderLayout());

    add(new AnalogClock());

    setPreferredSize(new Dimension(250, 250));

  }

  public static void main(String[] args) {

    EventQueue.invokeLater(MainPanel::createAndShowGui);

  }

  private static void createAndShowGui() {

    try {

      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {

      ex.printStackTrace();

      Toolkit.getDefaultToolkit().beep();

    }

    JFrame frame = new JFrame("AnalogClock");

    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    frame.getContentPane().add(new MainPanel());

    frame.pack();

    frame.setLocationRelativeTo(null);

    frame.setVisible(true);

  }

}

class AnalogClock extends JPanel {

  protected LocalTime time;// = LocalTime.now(ZoneId.systemDefault());

  protected AnalogClock() {

    super();

    new Timer(100, e -> {

      time = LocalTime.now(ZoneId.systemDefault());

      repaint();

    }).start();

  }

  @Override protected void paintComponent(Graphics g) {

    Graphics2D g2 = (Graphics2D) g.create();

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    Rectangle rect = SwingUtilities.calculateInnerArea(this, null);

    g2.setColor(Color.BLACK);

    g2.fill(rect);

    float radius = Math.min(rect.width, rect.height) / 2f - 10f;

    // g2.fill(new Ellipse2D.Double(rect.getCenterX() - radius, rect.getCenterY() - radius, radius * 2f, radius * 2f));

    g2.translate(rect.getCenterX(), rect.getCenterY());

    // Drawing the hour markers

    float hourMarkerLen = radius / 6f - 10f;

    Shape hourMarker = new Line2D.Float(0f, hourMarkerLen - radius, 0f, -radius);

    Shape minuteMarker = new Line2D.Float(0f, hourMarkerLen / 2f - radius, 0f, -radius);

    AffineTransform at = AffineTransform.getRotateInstance(0d);

    g2.setStroke(new BasicStroke(2f));

    g2.setColor(Color.WHITE);

    for (int i = 0; i < 60; i++) {

      if (i % 5 == 0) {

        g2.draw(at.createTransformedShape(hourMarker));

      } else {

        g2.draw(at.createTransformedShape(minuteMarker));

      }

      at.rotate(Math.PI / 30d);

    }

    //文字12 3 6 9 rectは横250,縦250 たてよこのセンターが原点0,0

    Font font = new Font("Arial", Font.BOLD, 14);

    g2.setFont(font);

    g2.drawString("12", radius * 0.75f * (int)Math.cos(Math.PI / 2f) - 7f, -radius * 0.75f * (int)Math.sin(Math.PI / 2f));

    g2.drawString("3", radius * 0.75f * (int)Math.cos(0f), -radius * 0.75f * (int)Math.sin(0f) + 7f);

    g2.drawString("6", radius * 0.75f * (int)Math.cos(-Math.PI / 2f) - 7f, -radius * 0.75f * (int)Math.sin(-Math.PI / 2f) + 7f);

    g2.drawString("9", radius * 0.75f * (int)Math.cos(Math.PI) - 7f, -radius * 0.75f * (int)Math.sin(Math.PI) + 7f);

    double miriRot = time.getNano() * Math.PI / 30000000000d;//OK!

    double miriSecondRot = time.getSecond() * Math.PI / 30d + miriRot;

    double secondRot = time.getSecond() * Math.PI / 30d;

    double minuteRot = time.getMinute() * Math.PI / 30d + secondRot / 60d;

    // double hourRot = time.getHour() * Math.PI * 2d / 12d + time.getMinute() * Math.PI * 2d / (12d * 60d);

    double hourRot = time.getHour() * Math.PI / 6d + minuteRot / 12d;

    // Drawing the hour hand

    float hourHandLen = radius / 1.5f;

    Shape hourHand = new Line2D.Float(0f, 0f, 0f, -hourHandLen);

    g2.setStroke(new BasicStroke(8f));

    g2.setPaint(Color.cyan);    //LIGHT_GRAY);

    g2.draw(AffineTransform.getRotateInstance(hourRot).createTransformedShape(hourHand));

    // Drawing the minute hand

    float minuteHandLen = 5f * radius / 6f;

    Shape minuteHand = new Line2D.Float(0f, 0f, 0f, -minuteHandLen);

    g2.setStroke(new BasicStroke(4f));

    g2.setPaint(Color.green);  //WHITE);

    g2.draw(AffineTransform.getRotateInstance(minuteRot).createTransformedShape(minuteHand));

    // Drawing the second hand

    float r = radius / 6f;

    float secondHandLen = radius - r;

    Shape secondHand = new Line2D.Float(0f, r, 0f, -secondHandLen);

    g2.setPaint(Color.RED);

    g2.setStroke(new BasicStroke(1f));

    g2.draw(AffineTransform.getRotateInstance(miriSecondRot).createTransformedShape(secondHand));

    g2.fill(new Ellipse2D.Float(-r / 4f, -r / 4f, r / 2f, r / 2f));

    g2.dispose();

  }

}