在java中移动图像后摆动删除
在移动spaceship后,我很难处理删除图像的问题
首先,我有我的MovingPrite课程,它使董事会:
公共类MovingPriteex扩展了JFrame{
private static final long serialVersionUID = 1L;
public MovingSpriteEx() {
initUI();
}
private void initUI() {
add(new Board());
setTitle("Moving sprite");
setSize(500,400);
setLocationRelativeTo(null);
System.out.println("calling");
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
MovingSpriteEx ex = new MovingSpriteEx();
ex.setVisible(true);
});
}
}
我的Board类使用一个paintComponent从一个太空船类中绘制,如下所示:
公共类板扩展JPanel实现ActionListener{
private static final long serialVersionUID = 1L;
private Timer timer;
private Spaceship ship;
private final int DELAY = 10;
private boolean incrementX = true;
private boolean incrementY=true;
public Board() {
initBoard();
}
private void initBoard() {//building the frame
addKeyListener(new TAdapter());//listens to the KeyAdapter that can read on the keyboards input
setBackground(Color.black);
setFocusable(true);
ship = new Spaceship();
timer = new Timer(DELAY,this);
timer.start();
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
doDrawing(g);
Toolkit.getDefaultToolkit().sync();
}
private void doDrawing(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.drawImage(ship.getImage(),ship.getX(), ship.getY(), this);
}
@Override
public void actionPerformed(ActionEvent arg0) {
step();
}
private void step() {
ship.move();
repaint(ship.getX()-1,ship.getY()-1,ship.getWidth()+2,ship.getHeight()+2);
}
private class TAdapter extends KeyAdapter{
@Override
public void keyReleased(KeyEvent e) {
ship.keyReleased(e);
}
@Override
public void keyPressed(KeyEvent e) {
ship.keyPressed(e);
}
}
}
还有宇宙飞船舱:
公共级宇宙飞船{
private int dx;
private int dy;
private int x = 40;
private int y = 60;
private int w;
private int h;
private Image image;
public Spaceship() {
loadImage();
}
private void loadImage() {
ImageIcon ii = createImageIcon("../Images/spaceship.jpg","something");
image = ii.getImage();
w = ii.getIconWidth();
h = ii.getIconHeight();
}
private ImageIcon createImageIcon(String path, String description) {
java.net.URL imgURL = getClass().getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL, description);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
public void move() {
x += dx;
y += dy;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public int getWidth() {
return w;
}
public int getHeight() {
return h;
}
public Image getImage() {
return image;
}
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT) {
dx = -2;
}
if (key == KeyEvent.VK_RIGHT) {
dx = 2;
}
if (key == KeyEvent.VK_UP) {
dy = -2;
}
if (key == KeyEvent.VK_DOWN) {
dy = 2;
}
}
public void keyReleased(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT) {
dx = 0;
}
if (key == KeyEvent.VK_RIGHT) {
dx = 0;
}
if (key == KeyEvent.VK_UP) {
dy = 0;
}
if (key == KeyEvent.VK_DOWN) {
dy = 0;
}
}
public static void main(String [] args) {
}
}
希望有人能看到我做错了什么
拉斯姆斯
# 1 楼答案
你的代码会在每一帧将船的图像绘制到你的棋盘(JPanel)上,但不会清除之前绘制的图像,JPanel不会为你这样做。保留一份调用drawImage时使用的坐标的副本,然后下次清除该区域,对于你的普通背景,你可以使用fillRect
例如,当你在纯黑色背景上绘制时,你可以在你的太空船类中添加如下内容,并调用它,而不是在doDrawing中调用drawImage