82 lines
2.4 KiB
Java
82 lines
2.4 KiB
Java
import java.awt.*;
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import java.awt.event.*;
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import static java.lang.Math.*;
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import java.time.LocalTime;
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import javax.swing.*;
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class Clock extends JPanel {
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final float degrees06 = (float) (PI / 30);
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final float degrees30 = degrees06 * 5;
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final float degrees90 = degrees30 * 3;
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final int size = 590;
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final int spacing = 40;
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final int diameter = size - 2 * spacing;
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final int cx = diameter / 2 + spacing;
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final int cy = diameter / 2 + spacing;
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public Clock() {
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setPreferredSize(new Dimension(size, size));
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setBackground(Color.white);
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new Timer(1000, (ActionEvent e) -> {
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repaint();
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}).start();
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}
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@Override
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public void paintComponent(Graphics gg) {
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super.paintComponent(gg);
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Graphics2D g = (Graphics2D) gg;
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
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RenderingHints.VALUE_ANTIALIAS_ON);
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drawFace(g);
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final LocalTime time = LocalTime.now();
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int hour = time.getHour();
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int minute = time.getMinute();
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int second = time.getSecond();
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float angle = degrees90 - (degrees06 * second);
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drawHand(g, angle, diameter / 2 - 30, Color.red);
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float minsecs = (minute + second / 60.0F);
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angle = degrees90 - (degrees06 * minsecs);
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drawHand(g, angle, diameter / 3 + 10, Color.black);
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float hourmins = (hour + minsecs / 60.0F);
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angle = degrees90 - (degrees30 * hourmins);
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drawHand(g, angle, diameter / 4 + 10, Color.black);
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}
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private void drawFace(Graphics2D g) {
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g.setStroke(new BasicStroke(2));
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g.setColor(Color.white);
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g.fillOval(spacing, spacing, diameter, diameter);
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g.setColor(Color.black);
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g.drawOval(spacing, spacing, diameter, diameter);
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}
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private void drawHand(Graphics2D g, float angle, int radius, Color color) {
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int x = cx + (int) (radius * cos(angle));
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int y = cy - (int) (radius * sin(angle));
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g.setColor(color);
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g.drawLine(cx, cy, x, y);
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(() -> {
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JFrame f = new JFrame();
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f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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f.setTitle("Clock");
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f.setResizable(false);
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f.add(new Clock(), BorderLayout.CENTER);
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f.pack();
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f.setLocationRelativeTo(null);
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f.setVisible(true);
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});
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}
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}
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