如何在Java 中監(jiān)聽(tīng)按鍵時(shí)使影像移動(dòng)

在Java 中，您可以結(jié)合使用Swing Timer 和Key在聆聽(tīng)按鍵時(shí)使影像移動(dòng)的綁定。操作方法如下：

1. 建立 Swing 計(jì)時(shí)器： Swing 計(jì)時(shí)器用於定期執(zhí)行任務(wù)。在這種情況下，您可以使用它來(lái)更新影像的位置。
2. 定義按鍵綁定：按鍵綁定將按鍵與特定操作相關(guān)聯(lián)。您可以使用鍵綁定來(lái)偵測(cè)使用者何時(shí)按下某個(gè)鍵並相應(yīng)地移動(dòng)影像。
3. 繪製影像： 重寫JPanel 的PaintComponent 方法以在其目前位置繪製影像.

範(fàn)例程式碼：

範(fàn)例程式碼：

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

public class ImageMoveOnKeyPress extends JPanel implements ActionListener {

    private Image image; // The image to be moved
    private int x, y; // The current position of the image

    private Timer timer; // The Swing Timer to update the image position
    private KeyBindings keyBindings; // The Key Bindings to detect keypresses

    public ImageMoveOnKeyPress() {
        // Load the image
        image = Toolkit.getDefaultToolkit().getImage("image_path");

        // Set the initial position of the image
        x = 50;
        y = 50;

        // Create a Swing Timer to update the image position
        timer = new Timer(10, this); // 10 milliseconds delay
        timer.start();

        // Create Key Bindings to detect keypresses
        keyBindings = new KeyBindings();
        getInputMap().put(KeyEvent.VK_LEFT, "left");
        getInputMap().put(KeyEvent.VK_RIGHT, "right");
        getInputMap().put(KeyEvent.VK_UP, "up");
        getInputMap().put(KeyEvent.VK_DOWN, "down");
        getActionMap().put("left", keyBindings.new MoveLeftAction());
        getActionMap().put("right", keyBindings.new MoveRightAction());
        getActionMap().put("up", keyBindings.new MoveUpAction());
        getActionMap().put("down", keyBindings.new MoveDownAction());
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(image, x, y, null);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // Update the image position based on keypress
        if (keyBindings.isLeftPressed()) {
            x -= 1;
        } else if (keyBindings.isRightPressed()) {
            x += 1;
        } else if (keyBindings.isUpPressed()) {
            y -= 1;
        } else if (keyBindings.isDownPressed()) {
            y += 1;
        }

        // Repaint the panel to display the moved image
        repaint();
    }

    private class KeyBindings {
        private boolean leftPressed, rightPressed, upPressed, downPressed;

        public boolean isLeftPressed() {
            return leftPressed;
        }

        public void setLeftPressed(boolean leftPressed) {
            this.leftPressed = leftPressed;
        }

        public boolean isRightPressed() {
            return rightPressed;
        }

        public void setRightPressed(boolean rightPressed) {
            this.rightPressed = rightPressed;
        }

        public boolean isUpPressed() {
            return upPressed;
        }

        public void setUpPressed(boolean upPressed) {
            this.upPressed = upPressed;
        }

        public boolean isDownPressed() {
            return downPressed;
        }

        public void setDownPressed(boolean downPressed) {
            this.downPressed = downPressed;
        }

        private class MoveLeftAction extends AbstractAction {
            @Override
            public void actionPerformed(ActionEvent e) {
                leftPressed = true;
            }
        }

        private class MoveRightAction extends AbstractAction {
            @Override
            public void actionPerformed(ActionEvent e) {
                rightPressed = true;
            }
        }

        private class MoveUpAction extends AbstractAction {
            @Override
            public void actionPerformed(ActionEvent e) {
                upPressed = true;
            }
        }

        private class MoveDownAction extends AbstractAction {
            @Override
            public void actionPerformed(ActionEvent e) {
                downPressed = true;
            }
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();

範(fàn)例程式碼：範(fàn)例程式碼：範(fàn)例程式碼：範(fàn)例程式碼：範(fàn)例程式碼：範(fàn)例程式碼：範(fàn)例碼以下範(fàn)例程式碼示範(fàn)如何使用Swing計(jì)時(shí)器和按鍵綁定在監(jiān)聽(tīng)按鍵時(shí)使影像移動(dòng)：

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