在swing中使用Double Buffer时出现NullPointerException [英] NullPointerException when using Double Buffer in swing
问题描述
在下面的代码中,我正在使用doubleBuffer来避免图像闪烁,如中所述我的问题
In the following code i'm using a doubleBuffer to avoid flickering of the image as was suggested in this question of mine
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestProgram extends JFrame implements KeyListener {
private Image doubleBuffer;
private Graphics myGraphics;
private BufferedImage TestImage;
private int cordX = 100;
private int cordY = 100;
public TestProgram() {
setTitle("Testing....");
setSize(500,500);
imageLoader();
setVisible(true);
}
public static void main(String[] args) {
new TestProgram();
}
public void imageLoader() {
try {
String testPath = "test.png";
TestImage = ImageIO.read(getClass().getResourceAsStream(testPath));
} catch (IOException ex) {
ex.printStackTrace();
}
addKeyListener(this);
doubleBuffer = createImage(getWidth(), getHeight());
myGraphics = doubleBuffer.getGraphics();
drawImages();
}
@Override
public void update(Graphics g) {
drawImages();
g.drawImage(doubleBuffer, 0, 0, this);
}
public void drawImages() {
myGraphics.drawImage(TestImage, cordX, cordY, this);
}
public void keyPressed(KeyEvent ke) {
switch (ke.getKeyCode()) {
case KeyEvent.VK_RIGHT: {
cordX+=5;
}
break;
case KeyEvent.VK_LEFT: {
cordX-=5;
}
break;
case KeyEvent.VK_DOWN: {
cordY+=5;
}
break;
case KeyEvent.VK_UP: {
cordY-=3;
}
break;
}
repaint();
}
public void keyTyped(KeyEvent ke) {}
public void keyReleased(KeyEvent ke) {}
}
问题是我在这一行得到一个nullPointerException
The problem is that im getting a nullPointerException at this line
myGraphics = doubleBuffer.getGraphics();
我的做法是正确的吗?
请帮忙。
谢谢
is my approach correct in doing this? Please help. thanks
推荐答案
-
不要画到
JFrame
直接放在那里JPanel
或JComponent
Swing GUI应该从初始主题开始
Swing GUI should be starting from Initial Thread
什么 TestImage
以及图片的路径
???,
KeyListener 未指定用于 Swing JComponents ,请使用 KeyBindings 而不是
KeyListener isn't designated for Swing JComponents, use KeyBindings instead
坐标已更改,您必须调用 repaint()
after coordinates changed you have to call repaint()
完全放入
。
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.*;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import javax.swing.*;
public class MoveIcon extends JPanel {
private static final long serialVersionUID = 1L;
private static final String IMAGE_PATH = "http://duke.kenai.com/misc/Bullfight.jpg";
private static final String IMAGE_PATH_PLAYER = "http://duke.kenai.com/iconSized/duke4.gif";
public static final int STEP = 3;
private static final int TIMER_DELAY = STEP * 8;
private BufferedImage bkgrndImage = null;
private BufferedImage playerImage = null;
private Map<Direction, Boolean> directionMap = new HashMap<Direction, Boolean>();
private int playerX = 0;
private int playerY = 0;
enum Direction {
UP(KeyEvent.VK_UP, 0, -1), DOWN(KeyEvent.VK_DOWN, 0, 1),
LEFT(KeyEvent.VK_LEFT, -1, 0), RIGHT(KeyEvent.VK_RIGHT, 1, 0);
private int keyCode;
private int xDirection;
private int yDirection;
private Direction(int keyCode, int xDirection, int yDirection) {
this.keyCode = keyCode;
this.xDirection = xDirection;
this.yDirection = yDirection;
}
public int getKeyCode() {
return keyCode;
}
public int getXDirection() {
return xDirection;
}
public int getYDirection() {
return yDirection;
}
}
public MoveIcon() {
try {
URL bkgrdImageURL = new URL(IMAGE_PATH);
URL playerImageURL = new URL(IMAGE_PATH_PLAYER);
bkgrndImage = ImageIO.read(bkgrdImageURL);
playerImage = ImageIO.read(playerImageURL);
setPreferredSize(new Dimension(bkgrndImage.getWidth(), bkgrndImage.getHeight()));
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
for (Direction direction : Direction.values()) {
directionMap.put(direction, false);
}
setKeyBindings();
Timer timer = new Timer(TIMER_DELAY, new TimerListener());
timer.start();
}
private void setKeyBindings() {
InputMap inMap = getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
ActionMap actMap = getActionMap();
for (final Direction direction : Direction.values()) {
KeyStroke pressed = KeyStroke.getKeyStroke(direction.getKeyCode(), 0, false);
KeyStroke released = KeyStroke.getKeyStroke(direction.getKeyCode(), 0, true);
inMap.put(pressed, direction.toString() + "pressed");
inMap.put(released, direction.toString() + "released");
actMap.put(direction.toString() + "pressed", new AbstractAction() {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
directionMap.put(direction, true);
}
});
actMap.put(direction.toString() + "released", new AbstractAction() {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
directionMap.put(direction, false);
}
});
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (bkgrndImage != null) {
g.drawImage(bkgrndImage, 0, 0, null);
}
if (playerImage != null) {
g.drawImage(playerImage, playerX, playerY, null);
}
}
private class TimerListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
boolean moved = false;
for (Direction direction : Direction.values()) {
if (directionMap.get(direction)) {
playerX += STEP * direction.getXDirection();
playerY += STEP * direction.getYDirection();
moved = true;
}
}
if (moved) {
int x = playerX - 2 * STEP;
int y = playerY - 2 * STEP;
int w = playerImage.getWidth() + 4 * STEP;
int h = playerImage.getHeight() + 4 * STEP;
MoveIcon.this.repaint(x, y, w, h); // !! repaint just the player
}
}
}
private static void createAndShowUI() {
JFrame frame = new JFrame("MoveIcon");
frame.getContentPane().add(new MoveIcon());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowUI();
}
});
}
}
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