是否可以在这些代码上使用 JPanel 而不是 JComponent？

问题描述

我已经制作了这个太阳系，到目前为止我已经完成了制作这个代码。 如图所示，我想使用 public static class SolarCv extends JComponent 而不是使用 public static class SolarCv extends JPanel，但它不起作用。我应该在代码中更改什么以及如何添加围绕对象的轨道，如图所示？

package solar;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.io.IOException;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class Orbit {

    public static class SolarCv extends JComponent {
        int width;
        int height;

        public SolarCv(int width,int height) {
            this.width = width;
            this.height = height;
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(width,height);
        }

        @Override
        public void paint(Graphics g) {
            Graphics2D g2 = (Graphics2D) g;
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);

            // Clear the background.
            g2.setColor(getBackground());
            g2.fillRect(0,getWidth(),getHeight());

            // Sun transform. Just centre it in the window.
            AffineTransform StarSun = AffineTransform.getTranslateInstance(getWidth() / 2,getHeight() / 2);

            // Draw the sun
            g2.setTransform(StarSun);
            SuperStar(g2,80,Color.YELLOW);

            // Orbital period.
            // One rotation every 10s.
            double percentRotation = System.currentTimeMillis() % 10000 / 10000.0;
            // To radians.
            double angle = -Math.PI * 2 * percentRotation;

            // Earth transform.
            // Set the orbital radius to 1/3rd the panel width
            AffineTransform StarEarth = AffineTransform.getTranslateInstance(getWidth() / 4,0);
            // Rotate
            StarEarth.preConcatenate(AffineTransform.getRotateInstance(angle));
            // Add the sun transform
            StarEarth.preConcatenate(StarSun);

            // Draw the earth
            g2.setTransform(StarEarth);
            SuperStar(g2,40,Color.BLUE);

            // Moon transform.
            // Set the orbital radius to 1/10th the panel width
            AffineTransform StarMoon = AffineTransform.getTranslateInstance(getWidth() / 10,0);
            // Rotate
            StarMoon.preConcatenate(AffineTransform.getRotateInstance(angle));
            // Add the earth transform (already includes the sun transform)
            StarMoon.preConcatenate(StarEarth);

            // Draw the moon
            g2.setTransform(StarMoon);
            SuperStar(g2,20,Color.DARK_GRAY);
        }

        private void SuperStar(Graphics2D g2,int size,Color color) {
            g2.setColor(color);
            g2.fillOval(-size / 2,-size / 2,size,size);
        }
    }

    public static void main(String[] args) throws IOException,InterruptedException {
        JFrame SolarSys = new JFrame("Orbit");
        SolarSys.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        JComponent SolarCv = new SolarCv(500,500);
        SolarSys.add(SolarCv);
        SolarSys.pack();
        SolarSys.setVisible(true);

        while (true) {
            Thread.sleep(20);
            SolarCv.repaint();
        }
    }
}

解决方法

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