Ich versuche, einen Ball nach und nach zu bewegen, wenn Sie eine der Pfeiltasten drücken. Im Moment teleportiert er sich nur. Ich will es, damit du siehst, wie sie sich bewegt. Basierend aufBeispielIch verwende Tastenkombinationen und es gibt eine Variable namens Delta, die bewirkt, dass sich die Kugel um 50 Pixel bewegt. Wie ich bereits sagte, erscheint die Kugel nur 50 Pixel in der Richtung, in der Sie die Pfeiltaste gedrückt haben Sie sollten einen Ball treten, den Sie sehen können, wie er von Punkt a nach b gelangt. Gehen Sie zu Zeile 89, in der sich das Problem befindet.

package game;

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;

/**
 * @see https://stackoverflow.com/questions/6991648
 * @see https://stackoverflow.com/questions/6887296
 * @see https://stackoverflow.com/questions/5797965
 */
public class LinePanel extends JPanel {
myObject ball;

private Point b1 = new Point(0,0);


private MouseHandler mouseHandler = new MouseHandler();
private Point p1 = new Point(100, 100);
private Point p2 = new Point(540, 380);
private boolean drawing;

public LinePanel() {
    this.setPreferredSize(new Dimension(640, 480));
    this.addMouseListener(mouseHandler);
    this.addMouseMotionListener(mouseHandler);
}

@Override
protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    g2d.setColor(Color.blue);
    g2d.setRenderingHint(
        RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.setStroke(new BasicStroke(8,
        BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL));
    g.drawLine(p1.x, p1.y, p2.x, p2.y);
    ball = new myObject(b1.x,b1.y,"Stuff/ball.png",50,50);
    g.drawImage(ball.getImage(),ball.getX(),ball.getY(), ball.getWidth(),         ball.getHeight(), null);
    repaint();
}

private class MouseHandler extends MouseAdapter {

    @Override
    public void mousePressed(MouseEvent e) {
        drawing = true;
        p1 = e.getPoint();
        p2 = p1;
        repaint();
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        drawing = false;
        p2 = e.getPoint();
        repaint();
    }

    @Override
    public void mouseDragged(MouseEvent e) {
        if (drawing) {
            p2 = e.getPoint();
            repaint();
        }
    }
}

private class ControlPanel extends JPanel {

    private static final int DELTA = 50;
// above is telling the ball to move by 50 pixels
    // I want it to move by 50 pixels but gradually I dont want it to teleport
    public ControlPanel() {
        this.add(new MoveButton("\u2190", KeyEvent.VK_LEFT, -DELTA, 0));
        this.add(new MoveButton("\u2191", KeyEvent.VK_UP, 0, -DELTA));
        this.add(new MoveButton("\u2192", KeyEvent.VK_RIGHT, DELTA, 0));
        this.add(new MoveButton("\u2193", KeyEvent.VK_DOWN, 0, DELTA));


    }


    private class MoveButton extends JButton {

        KeyStroke k;
        int myX, myY;

        public MoveButton(String name, int code, final int myX, final int myY) {
            super(name);
            this.k = KeyStroke.getKeyStroke(code, 0);
            this.myX = myX;
            this.myY = myY;
            this.setAction(new AbstractAction(this.getText()) {

                @Override
                public void actionPerformed(ActionEvent e) {
                    LinePanel.this.b1.translate(myX, myY);

                    LinePanel.this.repaint();
                }
            });
            ControlPanel.this.getInputMap(
                WHEN_IN_FOCUSED_WINDOW).put(k, k.toString());
            ControlPanel.this.getActionMap().put(k.toString(), new AbstractAction() {

                @Override
                public void actionPerformed(ActionEvent e) {
                    MoveButton.this.doClick();
                }
            });
        }
    }
}



private void display() {
    JFrame f = new JFrame("LinePanel");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(this);
    f.add(new ControlPanel(), BorderLayout.SOUTH);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
}

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            new LinePanel().display();
        }
    });
}


}