如何使用KeyListener仅旋转一个矩形，而不是再次执行

Question

我有一个矩形，我想要旋转。所以我只是按每次按键切换宽度和高度。但是该键也会向下移动矩形，因此再次单击后它会旋转回原来的位置。

所以我想知道如何让它只旋转一次，之后如果再向下按（使其旋转的键）它再次向下移动但不再旋转它。

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

public class paint extends JLabel implements KeyListener {
    int x = 1;
    int y = 1;
    int velocity = 20;
    int w = 200;
    int h = 100;
    int temp;

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        this.setBackground(Color.BLACK);
        g.setColor(Color.BLACK);

        g.setColor(Color.RED);
        g.fillRect(x, y, w, h);
        repaint();

    }
    //this is the section i am talking about.
    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_DOWN) {
            y += velocity;
            System.out.println(y);
            //the next three lines rotate the rectangle
            temp = w;
            w = h;
            h = temp;

            if (y > 261) {
                y = 1;
            }

        }

        if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
            x += velocity;
            System.out.println(x);
            if (x > 591) {
                x = 1;
            }

        } else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
            x -= velocity;
            System.out.println(x);
            if (x < 1) {
                x = 591;
            }

        } else if (e.getKeyCode() == KeyEvent.VK_UP) {
            y -= velocity;
            System.out.println(y);
            if (y < 1) {
                y = 271;

            }
        }

    }

    public void keyReleased(KeyEvent arg0) {
        // TODO Auto-generated method stub

    }

    public void keyTyped(KeyEvent arg0) {
        // TODO Auto-generated method stub

    }

}