所以我试图实现一个游戏，在这个游戏中玩家被小行星击中加速，他们会失去生命。我想做的就是创建一个方形数组，删除玩家被击中的一个方格。出于某种原因，当我尝试在paintComponent方法中x.draw矩形时，我不断得到“找不到符号错误”，我不明白为什么。谁能解释一下呢？
package lightrunner;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import java.util.Random;
import java.awt.geom.Area;
import java.util.ArrayList;
import javax.swing.JMenuBar;
import javax.swing.Timer;
import java.util.Iterator;
import java.awt.geom.Rectangle2D;
class LightRunner
{
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600,520);
frame.setTitle("Light Runner");
frame.add(new GamePanel());
frame.setVisible(true);
}
public static class GamePanel extends JPanel
{
public java.util.List<Rectangle> lives;
Ship ship;
Asteroid asteroid;
Asteroid asteroid2;
Timer timer;
Graphics g;
// private final int MILLESECONDS_BETWEEN_FRAMES = 10;
Asteroid[] ast_array;
boolean isStar;
public GamePanel()
{
super();
setBackground(Color.black);
// menu();
initializeGameObjects();
addKeyListener(new ShipMover());
setFocusable(true);
}
public void initializeGameObjects()
{
ast_array = new Asteroid[8];
//asteroid = new Asteroid(250,250, "/Users/nicholascerillo/Desktop/asteroid.png");
// asteroid2 = new Asteroid(300,300, "/Users/nicholascerillo/Desktop/asteroid.png");
ship = new Ship(10, 164, "/Users/nicholascerillo/Desktop/ship.png");
timer = new Timer(10, new GameMotion());
//
for (int i = 0; i <= 7; i++)
{
Random rand = new Random();
int Astx = WIDTH + (i*200) + 200;
int Asty = rand.nextInt((600-0)) + 0;
// int star = rand.nextInt((10-0)) + 0;
ast_array[i] = new Asteroid(Astx,Asty);
}
lives = new ArrayList<Rectangle>();
lives.add(new Rectangle( 10, 10, 10, 10));
lives.add(new Rectangle( 10, 25, 10, 10));
lives.add(new Rectangle( 10, 30, 10, 10));
// GameMotion();
timer.start();
}
@Override
public void paintComponent(Graphics x)
{
//super();//paintComponent(x);
Graphics2D g2 = (Graphics2D)x;
ship.paint(g2);
g2.drawImage(ship.getShip(),ship.getX1(), ship.getY1(),this);
for(int r = 0; r < 7; r++)
{
g2.drawImage(ast_array[r].getImage(), ast_array[r].getX(), ast_array[r].getY(),null);
}
x.setColor(Color.RED);
for (Rectangle life : lives)
{
x.draw(life);
}
//asteroid.paint(g2);
}
private class GameMotion implements ActionListener
{
public GameMotion()
{
// light = new Timer(20,this);
}
public void actionPerformed(ActionEvent evt)
{
// light.start();
//checkBounds();
Iterator<Rectangle> it = lives.iterator();
// ship.BoundedY();
ship.move();
ast_array[0].moveAsteroid();
ast_array[1].moveAsteroid();
ast_array[2].moveAsteroid();
ast_array[3].moveAsteroid();
ast_array[4].moveAsteroid();
ast_array[5].moveAsteroid();
ast_array[6].moveAsteroid();
ast_array[7].moveAsteroid();
while(it.hasNext())
{
Rectangle life = it.next();
for(int p = 0; p < 7; p++)
{
ship.isHit(ast_array[p]);
if(ship.getHit())
{
it.remove();
}
}
}
repaint();
}
}
private class ShipMover implements KeyListener
{
public void keyPressed(KeyEvent evt) {
int key = evt.getKeyCode();
if (key == KeyEvent.VK_RIGHT )
{
ship.setSpeedX(5);
}
else if (key == KeyEvent.VK_LEFT)
{
ship.setSpeedX(-5);
}
else if(key == KeyEvent.VK_UP /*&& (ship.BoundedY())*/){
ship.setSpeedY(-5);
}
else if(key == KeyEvent.VK_DOWN /*&& (ship.BoundedY())*/){
ship.setSpeedY(5);
}
}
public void keyReleased(KeyEvent evt) {
int key = evt.getKeyCode();
if ((key == KeyEvent.VK_LEFT) || (key == KeyEvent.VK_RIGHT) ) {
ship.setSpeedX(0);
}
else if((key == KeyEvent.VK_UP) || (key == KeyEvent.VK_DOWN))
{
ship.setSpeedY(0);
}
}
public void keyTyped(KeyEvent evt) {
}
}
}
}