我无法使Graphics2D对象随WASD移动。此外，应将按下和释放的键输入到控制台中。这种分离效果很好，但是，我无法移动对象
我已经尝试将这段代码移到Background和Game类中。
public class Game extends JFrame implements KeyListener //Canvas is a blank work space to work and then override with Jfame
{
KeyEvent asd = null;
private static final long serialVersionUID = 1L;
public static final int WIDTH = 500;
public static final int HEIGHT = 500;
public static final int SCALE = 3;
BufferedImage myImage = null; //BufferedImage is a class used to handle data regarding an image
Background p = new Background();
public Game()
{
super ("Dungeons of Death");
}
public void start()
{
try
{
this.setLocation(200, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setPreferredSize(new Dimension(WIDTH*SCALE, HEIGHT*SCALE));
this.setVisible(true); //sets the visibility of the component. It is by default false.
this.setFocusable(true);
this.setResizable(false); //makes it so that the window size can not be adjusted
this.pack(); //sizes the frame so that all its contents are at or above their preferred sizes.
this.add(p);
addKeyListener(this);
while (true)
{
Thread.sleep(16);
this.repaint();
}
}
catch(Exception e)
{
e.printStackTrace(); //helps determine where the error is if there is one
}
}
public void keyTyped(KeyEvent evt)
{
int key = evt.getKeyCode();
switch(key)
{
case KeyEvent.VK_W:
{
p.setyc(-1);
System.out.println("" + evt.getKeyChar()); //for testing purposes
break;
}
case KeyEvent.VK_A:
{
p.setxc(-1);
System.out.println("" + evt.getKeyChar());
break;
}
case KeyEvent.VK_S:
{
//yC++;
p.setyc(1);
System.out.println("" + evt.getKeyChar());
break;
}
case KeyEvent.VK_D:
{
//xC++;
p.setxc(1);
System.out.println("" + evt.getKeyChar());
break;
}
/*default:
{
System.out.prwintln("bruhhhh");
break;
}*/
}
p.drawImage(p.getGuy(),p.getxc(),p.getyc(), p.geth(), p.getw(), new Color(0,0,0,0), p.gety()) ;
}
@Override
public void keyPressed(KeyEvent e) {
System.out.println("keyPressed="+KeyEvent.getKeyText(e.getKeyCode()));
}
@Override
public void keyReleased(KeyEvent e) {
System.out.println("keyReleased="+KeyEvent.getKeyText(e.getKeyCode()));
}
public static void main (String [] args)
{
Game x = new Game();
x.start();
}
}
public class Background extends JComponent
{
public Background()
{
//addKeyListener(this);
}
BufferedImage myImage = null;
BufferedImage guy = null;
ImageObserver y = null;
Graphics2D x = null;
Component a = new Button();
KeyEvent W = new KeyEvent(a,1,1,0, KeyEvent.VK_W, 'w' );
KeyEvent A = new KeyEvent(a,1,1,0, KeyEvent.VK_A, 'a' );
KeyEvent S = new KeyEvent(a,1,1,0, KeyEvent.VK_S, 's' );
KeyEvent D = new KeyEvent(a,1,1,0, KeyEvent.VK_D, 'd' );
int xC = 700;
int yC = 350;
int h = 150;
int w = 150;
private static final long serialVersionUID = 1L;
public void paintComponent(Graphics g)
{
try
{
myImage = ImageIO.read(new URL("https://www.pennington.com/-/media/images/pennington-na/us/blog/seed/all-you-need-to-know-about-bermudagrass/bermuda-header.jpg")); //used to handle image data
super.paintComponent(g);
g.drawImage(myImage, 0, 0, this.getWidth(), this.getHeight()/2 + 300, this); //use this not null bc when method called first time image has not been loaded yet so error if null
x = (Graphics2D) g;
x.setColor(Color.GREEN); //just in case background is still there
//x.fillOval(700, 400, 100, 100);
guy = ImageIO.read(new URL("https://images-na.ssl-images-amazon.com/images/I/61O3LuvpDML._SY355_.png"));
x.drawImage(guy,xC,yC, h, w, new Color(0,0,0,0), y);
//keyPress(A);
}
catch(Exception e)
{
e.printStackTrace();
}
}
public void setyc(int c)
{
yC +=c;
}
public void setxc(int c)
{
xC =+ c;
}
public int getxc()
{
return xC;
}
public int getyc()
{
return yC;
}
public BufferedImage getGuy()
{
return guy;
}
public int geth()
{
return h;
}
public int getw()
{
return w;
}
public ImageObserver gety()
{
return y;
}
/* public void keyTyped(KeyEvent evt)
{
int key = evt.getKeyCode();
switch(key)
{
case KeyEvent.VK_W:
{
yC--;
System.out.println("" + evt.getKeyChar()); //for testing purposes
break;
}
case KeyEvent.VK_A:
{
xC--;
System.out.println("" + evt.getKeyChar());
break;
}
case KeyEvent.VK_S:
{
yC++;
System.out.println("" + evt.getKeyChar());
break;
}
case KeyEvent.VK_D:
{
xC++;
System.out.println("" + evt.getKeyChar());
break;
}
default:
{
System.out.println("bruhhhh");
break;
}
}
x.drawImage(guy,xC,yC, h, w, new Color(0,0,0,0), y) ;
}
@Override
public void keyPressed(KeyEvent e) {
System.out.println("keyPressed="+KeyEvent.getKeyText(e.getKeyCode()));
}
@Override
public void keyReleased(KeyEvent e) {
System.out.println("keyReleased="+KeyEvent.getKeyText(e.getKeyCode()));
}*/
}
预期结果是表情符号应该弹出并随WASD移动
实际结果是它只是停留在那儿，没有动弹