サーバーが個別のメッセージを送信するマルチプレイヤーゲームに取り組んでいます。敵の種類と数。その特定のスプライトが画面に読み込まれます。画面を切り替えるための CardLayout と上部のボタンで区切られた 4 つのビューがあります。
これが私が設定したチェーンです。敵を描こうとすると・・・エラーが出ます。
Main クラスには、次のメソッドがあります。
public void handleAttack(String message){
ViewA.spawnEnemy(type,amt);
}
メソッドViewAを持つクラスです。spawnEnemy()
public class BattleView extends JPanel implements ActionListener {
private Player player;
private Timer timer;
private int B_WIDTH;
private int B_HEIGHT;
private boolean ingame;
private ArrayList aliens;
public BattleView(Player player) {
this.player = player;
addKeyListener(new TAdapter());
setFocusable(true);
setBackground(Color.RED);
setDoubleBuffered(true);
setSize(652, 480);
ingame = true;
timer = new Timer(5, this);
timer.start();
}
public void addNotify() {
super.addNotify();
B_WIDTH = getWidth();
B_HEIGHT = getHeight();
super.setPreferredSize(new Dimension(B_WIDTH,B_HEIGHT));
}
public void spawnEnemy(int type, int amount) {
aliens = new ArrayList();
for (int i=1; i<amount+1; i++ ) {
aliens.add(new Enemy(0-i*40,400));
System.out.println("Attack Message Recieved "+i);
}
}
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D)g;
g2d.drawImage(background, 0, 0, null);
if (player.isVisible()){
g2d.drawImage(player.getImage(), player.getX(), player.getY(), this);
}
ArrayList ms = player.getMissiles();
/* for (int i = 0; i < ms.size(); i++) {
Missile m = (Missile)ms.get(i);
g2d.drawImage(m.getImage(), m.getX(), m.getY(), this);
}*/
/* for (int i = 0; i < aliens.size(); i++) {
Enemy a = (Enemy)aliens.get(i);
if (a.isVisible()){
g2d.drawImage(a.getImage(), a.getX(), a.getY(), this);
}
}*/
g2d.setColor(Color.BLACK);
g2d.drawString("BattleView: ", 5, 15);
Toolkit.getDefaultToolkit().sync();
g.dispose();
}
@Override public void actionPerformed(ActionEvent e) {
/* if (aliens.size()==0) {
//send message to server that enemies have been killed
}*/
ArrayList ms = player.getMissiles();
/* for (int i = 0; i < ms.size(); i++) {
Missile m = (Missile) ms.get(i);
if (m.isVisible()){
m.move();
}else{
ms.remove(i);
}
}*/
/* for (int i = 0; i < aliens.size(); i++) {
Enemy a = (Enemy) aliens.get(i);
if (a.isVisible()){
a.move();
}else{
aliens.remove(i);
}
}*/
player.move();
checkCollisions();
repaint();
}
public void checkCollisions() {
/* Rectangle r3 = player.getBounds();
for (int j = 0; j<aliens.size(); j++) {
Enemy a = (Enemy) aliens.get(j);
Rectangle r2 = a.getBounds();
if (r3.intersects(r2)) {
player.setVisible(false);
a.setVisible(false);
ingame = false;
}
}*/
ArrayList ms = player.getMissiles();
/* for (int i = 0; i < ms.size(); i++) {
Missile m = (Missile) ms.get(i);
Rectangle r1 = m.getBounds();
for (int j = 0; j<aliens.size(); j++) {
Enemy a = (Enemy) aliens.get(j);
Rectangle r2 = a.getBounds();
if (r1.intersects(r2)) {
m.setVisible(false);
a.setVisible(false);
} // r1.intersects
} // for aliens.size()
}*/ // for ms.size()
}
private class TAdapter extends KeyAdapter {
public void keyReleased(KeyEvent e) {
player.keyReleased(e);
}
public void keyPressed(KeyEvent e) {
player.keyPressed(e);
}
}
}
System.out.println("Attack Message Recieved "+i);サーバーがメッセージを送信すると、この部分が 5 つ起動します。したがって、サーバーが 1,5.. を送信すると、タイプ 1 の 5 つのユニットが「受信」され、System.out.println5 回印刷されます。
forループを使用して敵ユニットを描画しようとするとpaint(g)..エラーが発生します forループをコメントアウトすると、すべてが正常にコンパイルされてロードされます（ただし、敵のスクリーンスプライトは作成されずSystem.out.println、サーバー経由で送信された N 回。
System.out.println火事の直後に敵を引き寄せるにはどうすればよいですか?
これはエラーです：
at ViewA.paint(ViewA.java:85)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.access$700(Unknown Source)
at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
ViewA.paint (ViewA.java:85) で
次の行に対応します。
for (int i = 0; i < aliens.size(); i++) { Enemy a = (Enemy)aliens.get(i); if (a.isVisible()) g2d.drawImage(a.getImage(), a.getX(), a.getY(), this); } g2d.setColor(Color.BLACK); g2d.drawString("BattleView: ", 5, 15);