現在ゲームを作成していますが、何らかの理由で Graphics2D コンポーネントが動かず、プログラムがクラッシュしてしまいます。KeyListener と移動の間に干渉はありますか? それとも、移動中にすべてのパネルを再描画したためでしょうか?
コードの各部分の機能についてコメントしました。
コードは次のとおりです。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class Interface extends JPanel implements ActionListener, KeyListener{
Timer timer;
Player p;
Alien[] a;
ImageIcon img, msl, al;
Image i, ms, ali;
Graphics2D g2d;
boolean allowUp = true, allowDown = true, allowAlienMove = false, firstDraw = true;
boolean[] allowAlien;
int mx, my = 0;
static int[] ay, ax, olday, oldax;
public Interface(){
setFocusable(true);
setBackground(Color.BLACK);
setDoubleBuffered(true);
addKeyListener(this);
img = new ImageIcon(this.getClass().getResource("player.jpg"));
al = new ImageIcon(this.getClass().getResource("alien.jpg"));
p = new Player(this.getWidth()/6, this.getHeight()/6,10,this.getHeight()/2,img);
timer = new Timer(1000, this);
allowAlien = new boolean[5];
a = new Alien[5];
ay = new int[5];
ax = new int[5];
olday = new int[5];
oldax = new int[5];
for(int i = 0; i < 5; i++){
ay[i] = -1;
olday[i] = -1;
ax[i] = -1;
oldax[i] = -1;
}
for(int i = 0; i < allowAlien.length; i++){
allowAlien[i] = false;
}
spawnAliens();
}
//SPAWN ALIENS
public void spawnAliens(){
int[] area = new int[5];
area[0] = 70;
area[1] = 170;
area[2] = 270;
area[3] = 370;
area[4] = 445;
for(int j = 0; j < ax.length; j++){
ax[j] = 700;
oldax[j] = ax[j];
}
for(int i =0; i < a.length; i++){
if(i > 0){
ay[i] = ((int)(Math.random()*area[i] + area[i-1]));
}else{
ay[i] = ((int)(Math.random()*area[i] + 5));
}
olday[i] = ay[i];
//THIS COMPONENT NOT MOVING
a[i] = new Alien(this.getWidth()/6, this.getHeight()/6,ax[i],ay[i],img);
allowAlien[i] = true;
repaint();
}
allowAlienMove = true;
}
//THIS IS THE DRAWING PART
public void paint(Graphics g){
super.paint(g);
i = img.getImage();
ms = msl.getImage();
ali = al.getImage();
g2d = (Graphics2D)g;
g2d.drawImage(i, p.getX(), p.getY(), null);
if(allowMissle){
g2d.drawImage(ms, m.getX(), m.getY(), null);
}
for(int i = 0; i < a.length; i++){
if(allowAlien[i]){
g2d.drawImage(ali, ax[i], ay[i], null);
}
}
if(firstDraw){
timer.start();
}
firstDraw = false;
}
//THIS IS THE MOVEMENT PART
public void actionPerformed(ActionEvent e){
while(ax[0] > 10){
ax[0] += 10;
repaint();
}
}
//KEY LISTENER INTERFACE METHODS
public void keyReleased(KeyEvent e){
}
public void keyPressed(KeyEvent e){
int key = e.getKeyCode();
if (key == KeyEvent.VK_W) {
if(p.getY() <= 5){
allowUp = false;
}else{
allowUp = true;
}
if(allowUp){
p.move(0, -5);
my = p.getY();
repaint();
}
}else if (key == KeyEvent.VK_S) {
if(p.getY() >= 410 - 5){
allowDown = false;
}else{
allowDown = true;
}
if(allowDown){
p.move(0, 5);
my = p.getY();
repaint();
}
}
}
public void keyTyped(KeyEvent e){
}
}
前もって感謝します ：）
`