如何在java swing中将逻辑与表单分开？

Question

我很难将游戏逻辑从视图中分离出来。视图应该是哑巴并简单地渲染模型的当前状态。但我无法弄清楚如何做到这一点。能否帮助我简化代码并将逻辑从表单中分离出来？因为我想扩展游戏并添加新的东西，但我不能因为代码的混乱形式。我是java的新手。

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

public class ProjectileShooterTest {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(600, 600);
        final ProjectileShooter projectileShooter = new ProjectileShooter();
        ProjectileShooterPanel projectileShooterPanel = new ProjectileShooterPanel(
                projectileShooter);
        projectileShooter.setPaintingComponent(projectileShooterPanel);
        JPanel controlPanel = new JPanel(new GridLayout(1, 0));
        controlPanel.add(new JLabel("Angle"));
        final JSlider angleSlider = new JSlider(0, 90, 45);
        controlPanel.add(angleSlider);
        controlPanel.add(new JLabel("Power"));
        final JSlider powerSlider = new JSlider(0, 100, 50);
        controlPanel.add(powerSlider);
        JButton shootButton = new JButton("Shoot");
        shootButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int angleDeg = angleSlider.getValue();
                int power = powerSlider.getValue();
                projectileShooter.setAngle(Math.toRadians(angleDeg));
                projectileShooter.setPower(power);
                projectileShooter.shoot();
            }
        });
        controlPanel.add(shootButton);
        f.getContentPane().setLayout(new BorderLayout());
        f.getContentPane().add(controlPanel, BorderLayout.NORTH);
        f.getContentPane().add(projectileShooterPanel, BorderLayout.CENTER);
        f.setVisible(true);
    }
}

class ProjectileShooter {
    private double angleRad = Math.toRadians(45);
    private double power = 50;
    private Projectile projectile;
    private JComponent paintingComponent;

    void setPaintingComponent(JComponent paintingComponent) {
        this.paintingComponent = paintingComponent;
    }

    void setAngle(double angleRad) {
        this.angleRad = angleRad;
    }

    void setPower(double power) {
        this.power = power;
    }

    void shoot() {
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                executeShot();
            }
        });
        t.setDaemon(true);
        t.start();
    }

    private void executeShot() {
        if (projectile != null) {
            return;
        }
        projectile = new Projectile();
        Point2D velocity = AffineTransform.getRotateInstance(angleRad).transform(
                new Point2D.Double(1, 0), null);
        velocity.setLocation(velocity.getX() * power * 0.5, velocity.getY() * power * 0.5);
        projectile.setVelocity(velocity);
        long prevTime = System.nanoTime();
        while (projectile.getPosition().getY() >= 0) {
            long currentTime = System.nanoTime();
            double dt = 3 * (currentTime - prevTime) / 1e8;
            projectile.performTimeStep(dt);
            prevTime = currentTime;
            paintingComponent.repaint();
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                return;
            }
        }
        projectile = null;
        paintingComponent.repaint();
    }

    Projectile getProjectile() {
        return projectile;
    }
}

class Projectile {
    private final Point2D ACCELERATION = new Point2D.Double(0, -9.81 * 0.1);
    private final Point2D position = new Point2D.Double();
    private final Point2D velocity = new Point2D.Double();

    public Point2D getPosition() {
        return new Point2D.Double(position.getX(), position.getY());
    }

    public void setPosition(Point2D point) {
        position.setLocation(point);
    }

    public void setVelocity(Point2D point) {
        velocity.setLocation(point);
    }

    void performTimeStep(double dt) {
        scaleAddAssign(velocity, dt, ACCELERATION);
        scaleAddAssign(position, dt, velocity);
    }

    private static void scaleAddAssign(Point2D result, double factor, Point2D addend) {
        double x = result.getX() + factor * addend.getX();
        double y = result.getY() + factor * addend.getY();
        result.setLocation(x, y);
    }
}

class ProjectileShooterPanel extends JPanel {
    private final ProjectileShooter projectileShooter;

    public ProjectileShooterPanel(ProjectileShooter projectileShooter) {
        this.projectileShooter = projectileShooter;
    }

    @Override
    protected void paintComponent(Graphics gr) {
        super.paintComponent(gr);
        Graphics2D g = (Graphics2D) gr;
        Projectile projectile = projectileShooter.getProjectile();
        if (projectile != null) {
            g.setColor(Color.RED);
            Point2D position = projectile.getPosition();
            int x = (int) position.getX();
            int y = getHeight() - (int) position.getY();
            Ellipse2D.Double gerd = new Ellipse2D.Double(x - 01, y - 10, 20, 20);
            g.draw(gerd);
            // g.fillOval(x-01, y-10, 20, 20);
        }
        Rectangle hadaf1 = new Rectangle(450, 450, 50, 50);
        Rectangle hadaf2 = new Rectangle(500, 450, 50, 50);
        Rectangle hadaf3 = new Rectangle(475, 400, 50, 50);
        g.draw(hadaf1);
        g.draw(hadaf2);
        g.draw(hadaf3);
    }
}

我会非常感激。