Java新手在这里！
我正在开发一款只是在屏幕上移动的小游戏，它会攻击我正在制作的小AI矩形。
我有两个GIF文件pikachu.gif（是的，它是一个口袋妖怪游戏）和pikready.gif。
我已经实现了KeyListener和所有内容，并且可以使用箭头键让Pikachu.gif在框架内移动。
我想要的是，当我按下箭头键时将图像更改为pikready.gif，我在网上看了看，似乎无法找到答案。
代码在下面，任何注释掉的东西都是我尝试的不同东西。
正如我所说的Java新手所以对我很轻松！
package game;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
public class PikachuAttack extends JFrame implements Runnable{
Graphics dbg;
Image dbImage;
Image Pik1;
static ImageIcon active;
int x, y, xDirection, yDirection;
public void run(){
try{
while(true){
move();
Thread.sleep(10);
}
}catch(Exception e){
System.out.println("Uh-oh, something went wrong!.");
}
}
private void move() {
x += xDirection;
y += yDirection;
}
public void setXDirection(int xdir) {
xDirection = xdir;
}
public void setYDirection(int ydir) {
yDirection = ydir;
}
// KEY COMMANDS //
public class AL extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if(keyCode == e.VK_LEFT) {
setXDirection(-1);
}
if(keyCode == e.VK_RIGHT) {
setXDirection(+1);
}
if(keyCode == e.VK_UP) {
setYDirection(-1);
}
if(keyCode == e.VK_DOWN) {
setYDirection(+1);
}
/*(if(keyCode == e.VK_LEFT | keyCode == e.VK_RIGHT | keyCode == e.VK_UP | keyCode == e.VK_DOWN){
active = new ImageIcon("C:\\Users\\Neil\\workspace\\MyOwnTutorials\\bin\\game\\pikready.gif");
}else{
active = new ImageIcon("C:\\Users\\Neil\\workspace\\MyOwnTutorials\\bin\\game\\pikachu.gif");
} */
}
@Override
public void keyReleased(KeyEvent e) {
int keyCode = e.getKeyCode();
if(keyCode== e.VK_LEFT){
setXDirection(0);
}
if(keyCode== e.VK_RIGHT){
setXDirection(0);
}
if(keyCode== e.VK_UP){
setYDirection(0);
}
if(keyCode== e.VK_DOWN){
setYDirection(0);
}
}
@Override
public void keyTyped(KeyEvent e) {
}
}
// CONSTRUCTOR //
public PikachuAttack(){
//Image Import
ImageIcon still = new ImageIcon("C:\\Java\\GIFS\\Pikachu.gif");
Pik1 = still.getImage();
//ImageIcon ready = new ImageIcon("C:\\Users\\Neil\\workspace\\MyOwnTutorials\\bin\\game\\pikready.gif");
//Pik2 = ready.getImage(); */
// Pik1 = active.getImage();
//JFrame properties
addKeyListener(new AL());
setTitle("Pikachu Attack");
setSize(500, 500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
setVisible(true);
x = 15;
y = 15;
}
public void paint(Graphics g){
dbImage = createImage(getWidth(), getHeight());
dbg = dbImage.getGraphics();
paintComponent(dbg);
g.drawImage(dbImage, 0, 0, this);
}
public void paintComponent(Graphics g){
g.setColor(Color.red);
g.fillRect(200, 190, 12, 20);
g.drawImage(Pik1, x, y, this);
g.setColor(Color.red);
repaint();
}
public static void main(String[] args) {
PikachuAttack game = new PikachuAttack();
Thread t1 = new Thread(game);
t1.start();
}
}
答案 0 :(得分：1)
为什么不创建对当前Image的新引用，比如currentImage和DOWN键，请执行以下操作：
if (keyCode == e.VK_DOWN) {
setYDirection(+1);
currentImage = Pik2; // the ready image
}
然后在paintComponent中，您可以绘制当前图像：
g.drawImage(currentImage, x, y, this);
答案 1 :(得分：0)
重绘后再打电话
revalidate();
答案 2 :(得分：0)
您应该创建一个具有空值或默认图像的图像，然后创建第二个图像，当您按下该键时将取代第一个图像。在键监听器中，您应该将图像的值设置为秒在您要按的键的键代码下的图像。
这是一个例子。按下键时移动的charechter与更改图像
public class WorldOfWarriorsDefault extends JPanel implements KeyListener, ActionListener //main game interface
{
Timer t = new Timer(5, this);
int x = 0, y = 0, velx = 0, vely = 0; //declares the default values co-ordinates of the moving object
Rectangle r = new Rectangle(100, 100, 40, 40);
Toolkit toolkit = Toolkit.getDefaultToolkit();
Image image1 = toolkit.getImage("D:\\My Stuff\\frame_2_delay-0.05s.gif");
Image image2 = toolkit.getImage("D:\\My Stuff\\runtest2.gif");
Image image3 = toolkit.getImage("D:\\My Stuff\\ezgif-3-4570fcd5e5.gif");
Image image4 = toolkit.getImage("D:\\My Stuff\\Leftr.gif");
Image image = image1;
public WorldOfWarriorsDefault() //makes a constructor
{
t.start(); //starts the timer
addKeyListener(this);
//adds a keyboard listener
setFocusable(true);
setFocusTraversalKeysEnabled(false);
}
public void actionPerformed(ActionEvent e)
{
x = x + velx;
y = y + vely;
repaint();
}
public void up()
{
vely = -2;
velx = 0;
}
public void down()
{
vely = 2;
velx = 0;
}
public void left()
{
velx = -2;
vely = 0;
}
public void right()
{
velx = 2;
vely = 0;
}
public void keyPressed(KeyEvent e)
{
int code = e.getKeyCode();
if (code == KeyEvent.VK_UP || code == KeyEvent.VK_W)
{
up();
}
if (code == KeyEvent.VK_DOWN || code == KeyEvent.VK_S)
{
down();
}
if (code == KeyEvent.VK_LEFT || code == KeyEvent.VK_A)
{
left();
image = image3;
}
if (code == KeyEvent.VK_RIGHT || code == KeyEvent.VK_D)
{
right();
image = image2;
}
}
public void keyTyped(KeyEvent e) {}
public void keyReleased(KeyEvent e)
{
int coder = e.getKeyCode();
if (coder == KeyEvent.VK_LEFT)
{
image = image4;
}
if (coder == KeyEvent.VK_RIGHT)
{
image = image1;
}
velx = 0;
vely = 0;
x = r.getBounds().x;
y = r.getBounds().y;
repaint();
}
public void paintComponent(Graphics g) //starts a painter
{
super.paintComponent(g); //paints the component
r.setBounds(x, y, 40, 40);
g.drawImage(image, x, y, this);
}
public static void main(String[] args)
{
JFrame f = new JFrame();
WorldOfWarriorsDefault w = new WorldOfWarriorsDefault();
f.add(w);
f.setVisible(true);
f.setSize(1900, 1000);
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}