在太空船周围移动图像后，我很难处理图像的删除
首先，我有我的movingsprite类，使董事会：
公共类movingspriteex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类正在使用paintcomponent从一个太空船类中进行绘制，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);
}
}}
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) {
}}
希望有人能看出我做错了什么
拉斯姆斯
1条答案
按热度按时间huwehgph1#
你的代码是绘制船舶图像到你的董事会（jpanel）的每一帧，但没有清除的图像，绘制帧之前，jpanel不会为你这样做。保留一份调用drawimage时使用的坐标副本，然后下次清除该区域，对于您的普通背景，您可以使用fillrect。
例如，当您在纯黑色背景上绘制时，您可以向spaceship类中添加如下内容并调用它，而不是在dodrawing中调用drawimage。