绕地球旋转月球JAVA

问题描述

我正在创建一个简单的太阳系。地球围绕太阳旋转。现在我在试图让月球绕地球旋转时挣扎，同时地球绕太阳旋转。谢谢您的帮助！地球代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Earth extends JPanel implements ActionListener{
    Timer t=new Timer(100,this);
    private int x;
    private int y;
    private int height;
    private int width;
    private Color color;
    double angle;
    
    public Planetet(int x,int y,int height,int width,Color color) {
    this.x=x;
    this.y=y;
    this.height=height;
    this.width=width;
    this.color=color;}
        
    
    
     public void paint(Graphics g) {
            //Extra Code for Screen clearing
            g.setColor(getBackground());
            boolean rotation=true;

            int a,b;
            if (rotation) {
                int width = getWidth();
                int height = getHeight();
                a = (int) (Math.cos(angle) * (width / 3) + (width / 2));
                b = (int) (Math.sin(angle) * (height / 3) + (height / 2));
            } else {
                a = getWidth()/2 - gjatsia/2;
                b = getHeight()/2 - gjersia/2;
            }

            g.setColor(ngjyra);
            g.filloval(a,b,gjatsia,gjersia);
            t.start();
        }
    public void actionPerformed(ActionEvent e) {
        angle+=0.1/2;
        if (angle>(2*Math.PI))
        angle=0.1;
        repaint();}
        
    
    
    
    public static void main (String [] args) {
        
        JFrame MainFrame=new JFrame();
        MainFrame.getContentPane().setBackground( Color.black );
        MainFrame.setSize(600,600);
        Sun sun=new Sun(250,250,50,Color.YELLOW);
        Earth earth=new Earth(400,270,20,Color.blue);
        Moon moon=new Moon(400,10,Color.GRAY);

        MainFrame.add(sun);
        MainFrame.setVisible(true);

        MainFrame.add(earth);

        MainFrame.setVisible(true);
        MainFrame.add(moon);

        MainFrame.setVisible(true);
    }



    

}

太阳代码：

import javax.swing.*;
import java.awt.*;
public class Sun extends JComponent{
    
    private int x;
    private int y;
    private int height;
    private int width;
    private Color color;
    double angle;
    
    public Sun(int x,Color color) {
    this.x=x;
    this.y=y;
    this.height=height;
    this.width=width;
    this.color=color;}
        
    
    
    public void paint(Graphics g) {
        

        g.setColor(color);
        g.filloval(x,y,height,width);
    }}

月球代码（需要更正）：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Moon extends JComponent implements ActionListener{
    Timer t=new Timer(100,this);
    private int x;
    private int y;
    private int height;
    private int width;
    private Color color;
    double angle;

    public Moon(int x,Color color) {
    this.x=x;
    this.y=y;
    this.height=height;
    this.width=width;
    this.color=color;}

    
    public void paint(Graphics g) {
        int width =getWidth();
        int height=getHeight();
         int a = (int) (Math.cos(angle) * (width/6) + (width/4));
         int b = (int) (Math.sin(angle) * (height/6) + (height/4));

        g.setColor(ngjyra);
        g.filloval(a,gjersia);
        t.start();
    }
    
    public void actionPerformed(ActionEvent e) {
        angle-=0.5/2;
        if (angle>(2*Math.PI))
        angle=0.0;
        repaint();}}

So this is the output. The earth and the moon both rotate on its own

解决方法

这样想：一切都围绕某物旋转 - A 围绕 B 旋转 - B 围绕 C 旋转 - C 围绕 D 旋转......你如何在代码中表示这种关系？也许通过给每个对象一个它旋转的对象的引用......

此外 - 如果您有多个具有相同或非常相似行为的对象 - 您可以将此行为抽象为父（或抽象）类 - 这样您就无需多次编写相同的代码。

希望能帮助你思考你的代码。

java java jpanel