我已经问了几个问题，但我还没有取得任何突破。所以我按照这里的例子：http: //www.camick.com/java/source/KeyboardAnimation.java被提到我。我为扩展 JComponent 的动画测试切换了 JLabel。但是我仍然没有得到任何结果。我认为可能是 Animation 类中的代码阻止了坐标更新。这个类是否会干扰键绑定动画？（下面的这个类循环遍历一些缓冲图像，用于行走动画，而不是在屏幕上移动它，而只是在一个静止图像和另一个图像之间切换，角色的腿移动。）
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import javax.swing.JComponent;
public class Animation extends JComponent{
private static final long serialVersionUID = 1L;
public BufferedImage currentFrame;
public boolean walking=false;
public int x=50;
public int y=50;
public int dx,dy;
public void update()
{
if (walking){
for(int frame=0;frame<(Art.player.length+1);frame++)
{
try{
currentFrame=Art.player[frame][0];
try {
Thread.sleep(200);
repaint();
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}catch(IndexOutOfBoundsException e)
{
frame=0;
currentFrame=Art.player[frame][0];
try {
Thread.sleep(200);
repaint();
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}else
{
currentFrame=Art.player[0][0];
}
}
public void startAnimation()
{
walking=true;
}
public void stopAnimation()
{
walking=false;
}
public void paintComponent(Graphics g)
{
g.drawImage(currentFrame,x,y,null);
}
}
这是键绑定类：
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.Map;
import java.util.HashMap;
import javax.swing.*;
public class KeyboardAnimation implements ActionListener
{
private final static String PRESSED = "pressed ";
private final static String RELEASED = "released ";
private JComponent component;
private Timer timer;
private Map<String, Point> pressedKeys = new HashMap<String, Point>();
public KeyboardAnimation(JComponent component, int delay)
{
this.component = component;
timer = new Timer(delay, this);
timer.setInitialDelay( 0 );
}
/*
* ¶m keyStroke - see KeyStroke.getKeyStroke(String) for the format of
* of the String. Except the "pressed|released" keywords
* are not to be included in the string.
*/
public void addAction(String keyStroke, int deltaX, int deltaY)
{
// Separate the key identifier from the modifiers of the KeyStroke
int offset = keyStroke.lastIndexOf(" ");
String key = offset == -1 ? keyStroke : keyStroke.substring( offset + 1 );
String modifiers = keyStroke.replace(key, "");
// Get the InputMap and ActionMap of the component
InputMap inputMap = component.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
ActionMap actionMap = component.getActionMap();
// Create Action and add binding for the pressed key
Action pressedAction = new AnimationAction(key, new Point(deltaX, deltaY));
String pressedKey = modifiers + PRESSED + key;
KeyStroke pressedKeyStroke = KeyStroke.getKeyStroke(pressedKey);
inputMap.put(pressedKeyStroke, pressedKey);
actionMap.put(pressedKey, pressedAction);
// Create Action and add binding for the released key
Action releasedAction = new AnimationAction(key, null);
String releasedKey = modifiers + RELEASED + key;
KeyStroke releasedKeyStroke = KeyStroke.getKeyStroke(releasedKey);
inputMap.put(releasedKeyStroke, releasedKey);
actionMap.put(releasedKey, releasedAction);
}
// Invoked whenever a key is pressed or released
private void handleKeyEvent(String key, Point moveDelta)
{
// Keep track of which keys are pressed
if (moveDelta == null)
pressedKeys.remove( key );
else
pressedKeys.put(key, moveDelta);
// Start the Timer when the first key is pressed
if (pressedKeys.size() == 1)
{
timer.start();
}
// Stop the Timer when all keys have been released
if (pressedKeys.size() == 0)
{
timer.stop();
}
}
// Invoked when the Timer fires
public void actionPerformed(ActionEvent e)
{
moveComponent();
}
// Move the component to its new location
private void moveComponent()
{
int componentWidth = component.getSize().width;
int componentHeight = component.getSize().height;
Dimension parentSize = component.getParent().getSize();
int parentWidth = parentSize.width;
int parentHeight = parentSize.height;
// Calculate new move
int deltaX = 0;
int deltaY = 0;
for (Point delta : pressedKeys.values())
{
deltaX += delta.x;
deltaY += delta.y;
}
// Determine next X position
int nextX = Math.max(component.getLocation().x + deltaX, 0);
if ( nextX + componentWidth > parentWidth)
{
nextX = parentWidth - componentWidth;
}
// Determine next Y position
int nextY = Math.max(component.getLocation().y + deltaY, 0);
if ( nextY + componentHeight > parentHeight)
{
nextY = parentHeight - componentHeight;
}
// Move the component
component.setLocation(nextX, nextY);
}
// Action to keep track of the key and a Point to represent the movement
// of the component. A null Point is specified when the key is released.
private class AnimationAction extends AbstractAction implements ActionListener
{
private Point moveDelta;
public AnimationAction(String key, Point moveDelta)
{
super(key);
this.moveDelta = moveDelta;
}
public void actionPerformed(ActionEvent e)
{
handleKeyEvent((String)getValue(NAME), moveDelta);
}
}
public static void main(String[] args)
{
Animation test = new Animation();
KeyboardAnimation animation = new KeyboardAnimation(test, 24);
animation.addAction("LEFT", -3, 0);
animation.addAction("RIGHT", 3, 0);
animation.addAction("UP", 0, -3);
animation.addAction("DOWN", 0, 3);
animation.addAction("control LEFT", -5, 0);
animation.addAction("V", 5, 5);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.getContentPane().add(test);
frame.setSize(600, 600);
frame.setLocationRelativeTo( null );
frame.setVisible(true);
test.startAnimation();
test.update();
}
static class ColorIcon implements Icon
{
private Color color;
private int width;
private int height;
public ColorIcon(Color color, int width, int height)
{
this.color = color;
this.width = width;
this.height = height;
}
public int getIconWidth()
{
return width;
}
public int getIconHeight()
{
return height;
}
public void paintIcon(Component c, Graphics g, int x, int y)
{
g.setColor(color);
g.fillRect(x, y, width, height);
}
}
}