我有一个横向卷轴游戏，游戏中有 4 个敌人。无论我向它发射多少子弹，其中一个敌人都不会死。前两个敌人的代码完全相同，我不知道为什么它不起作用。
板级：
package knowlesm.main;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.File;
import java.util.ArrayList;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.Timer;
public class Board extends JPanel implements ActionListener, Runnable {
Character p;
Image img;
Timer time;
Thread animator;
Enemy en, en2, en3, en4;
Ammo a1;
int v = 72;
boolean lost = false;
static Font font = new Font("SansSerif", Font.BOLD, 24);
public Board() {
p = new Character();
addKeyListener(new AL());
setFocusable(true);
ImageIcon i = new ImageIcon("res/background.png");
img = i.getImage();
time = new Timer(5, this);
time.start();
en = new Enemy(700, 200, "res/enemy_1.png");
en2 = new Enemy(700, 200, "res/enemy_1.png");
en3 = new Enemy(700, 200, "res/enemy_1.png");
en4 = new Enemy(700, 200, "res/enemy_1.png");
a1 = new Ammo(700, 200, "res/ammo.png");
}
public void actionPerformed(ActionEvent e) {
System.out.println(p.x);
try{
checkCollisions();
} catch (Exception error){
System.out.println("Can't make rectangle probably");
}
ArrayList bullets = Character.getBullets();
for (int w = 0; w < bullets.size(); w++) {
Bullet m = (Bullet) bullets.get(w);
if (m.getVisible() == true)
m.move();
else
bullets.remove(w);
}
p.Move();
if (p.x > 400)
en.move(p.getdx(), p.getLeft());
if (p.x > 600) {
en2.move(p.getdx(), p.getLeft());
}
if (p.x > 1800)
en3.move(p.getdx(), p.getLeft());
if (p.x > 2000) {
en4.move(p.getdx(), p.getLeft());
}
if (p.x > 1200) {
a1.move(p.getdx(), p.getLeft());
}
repaint();
}
private void checkCollisions() {
Rectangle r1 = en.getBounds();
Rectangle r2 = en2.getBounds();
Rectangle r3 = a1.getBounds();
Rectangle r4 = en3.getBounds();
Rectangle r5 = en4.getBounds();
ArrayList bullets = Character.getBullets();
for (int w = 0; w < bullets.size(); w++) {
Bullet m = (Bullet) bullets.get(w);
Rectangle m1 = m.getBounds();
if (r1.intersects(m1) && en.isAlive) {
en.isAlive = false;
m.visible = false;
} if (r2.intersects(m1) && en2.isAlive) {
en2.isAlive = false;
m.visible = false;
} if (r4.intersects(m1) && en2.isAlive) {
en3.isAlive = false;
m.visible = false;
} if (r5.intersects(m1) && en2.isAlive) {
en4.isAlive = false;
m.visible = false;
}
}
Rectangle d = p.getBounds();
if ((d.intersects(r1) && en.isAlive() == true)
|| (d.intersects(r2) && en2.isAlive() == true)
|| (d.intersects(r4) && en3.isAlive() == true)
|| (d.intersects(r5) && en4.isAlive() == true)){
lost = true;
}
if (d.intersects(r3)){
a1.isThere = false;
p.ammo = 10;
}
}
boolean k = false;
public void paint(Graphics g) {
if (lost)
System.exit(0);
if (p.dy == 1 && k == false) {
k = true;
animator = new Thread(this);
animator.start();
}
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
if ((p.GetX() - 590) % 2400 == 0)
p.nx = 0;
if ((p.GetX() - 1790) % 2400 == 0)
p.nx2 = 0;
g2d.drawImage(img, 685 - p.nx2, 0, null);
if (p.GetX() >= 590)
g2d.drawImage(img, 685 - p.nx, 0, null);
g2d.drawImage(p.getImage(), p.left, v, null);
ArrayList bullets = Character.getBullets();
for (int w = 0; w < bullets.size(); w++) {
Bullet m = (Bullet) bullets.get(w);
g2d.drawImage(m.getImage(), m.getX(), m.getY(), null);
}
g2d.setFont(font);
g2d.setColor(Color.BLUE);
g2d.drawString("Ammo left " + p.ammo, 500, 20);
if (p.x > 400) {
if (en.isAlive == true)
g2d.drawImage(en.getImage(), en.getX(), en.getY(), null);
}
if (p.x > 600) {
if (en2.isAlive == true)
g2d.drawImage(en2.getImage(), en2.getX(), en2.getY(), null);
}
if (p.x > 1800){
if(en3.isAlive == true){
g2d.drawImage(en3.getImage(), en3.getX(), en3.getY(), null);
}
}
if (p.x > 1800){
if(en4.isAlive == true){
g2d.drawImage(en3.getImage(), en3.getX(), en3.getY(), null);
}
}
if (p.x > 1200) {
if (a1.isThere == true) {
g2d.drawImage(a1.getImage(), a1.getX(), a1.getY(), null);
}
}
}
private class AL extends KeyAdapter {
public void keyReleased(KeyEvent e) {
p.KeyReleased(e);
}
public void keyPressed(KeyEvent e) {
p.KeyPressed(e);
}
}
public void run() {
long beforeTime, timeDiff, sleep;
beforeTime = System.currentTimeMillis();
while (done == false) {
cycle();
timeDiff = System.currentTimeMillis() - beforeTime;
sleep = 10 - timeDiff;
if (sleep < 0)
sleep = 2;
try {
Thread.sleep(sleep);
} catch (Exception e) {
}
beforeTime = System.currentTimeMillis();
}
done = false;
h = false;
k = false;
}
boolean done = false;
boolean h = false;
public void cycle() {
if (h == false)
v--;
if (v == -10)
h = true;
if (h == true && v < 72)
v++;
if (v == 72)
done = true;
}
}
弹药等级：
package knowlesm.main;
import java.awt.Image;
import java.awt.Rectangle;
import javax.swing.ImageIcon;
import java.awt.*;
public class Ammo {
int x, y;
boolean isThere = true;
Image img;
public Ammo(int startX, int startY, String Location) {
x = startX;
y = startY;
ImageIcon ammo = new ImageIcon(Location);
img = ammo.getImage();
}
public void move(int dx, int left)
{
if (dx == 1 && !((left + dx )< 150))//Added this to only move enemy when character moves forward (not back)
x = x - dx;
}
public Rectangle getBounds() {
return new Rectangle(x, y, 100, 100);
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public boolean isThere() {
return isThere;
}
public Image getImage(){
return img;
}
}
子弹类：
package knowlesm.main;
import java.awt.Image;
import java.awt.Rectangle;
import javax.swing.ImageIcon;
public class Bullet {
int x, y;
Image img;
boolean visible;
public Bullet(int startX, int startY) {
x = startX;
y = startY;
ImageIcon newBullet = new ImageIcon("res/bullet.png");
img = newBullet.getImage();
visible = true;
}
public Rectangle getBounds(){
return new Rectangle(x, y, 20, 20);
}
public int getX(){
return x;
}
public int getY(){
return y;
}
public boolean getVisible(){
return visible;
}
public Image getImage(){
return img;
}
public void move(){
x += 4;
if ( x > 750)
visible = false;
}
}
字符类：
package knowlesm.main;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import javax.swing.ImageIcon;
public class Character {
int x, dx, y, nx, nx2, left, dy;
Image still;
ImageIcon i_left = new ImageIcon("res/character_left.png");
ImageIcon i = new ImageIcon("res/character.png");
ImageIcon i2 = new ImageIcon("res/character_1.png");
ImageIcon i_jump = new ImageIcon("res/character_jump.png");
int ammo = 10;
static ArrayList bullets;
public Character() {
still = i.getImage();
x = 75;
y = 72;
nx2 = 685;
nx = 0;
left = 150;
bullets = new ArrayList();
}
public static ArrayList getBullets(){
return bullets;
}
public void fire(){
if ( ammo > 0){
ammo--;
Bullet z = new Bullet((left + 150), (y + 365 / 2));
bullets.add(z);
}
}
public void Move() {
if (dx != -1) {
if (left + dx <= 150) {
left = left + dx;
} else {
x += dx;
nx2 += dx;
nx += dx;
}
} else {
if ( left + dx > 0)
left = left + dx;
}
}
public Rectangle getBounds(){
return new Rectangle(left, y, 150, 365);
}
public int getLeft(){
return left;
}
public int GetX() {
return x;
}
public int GetY() {
return y;
}
public Image getImage() {
return still;
}
public int getdx(){
return dx;
}
public int getnx(){
return nx;
}
public int getnx2(){
return nx2;
}
public int ammo(){
return ammo;
}
int w = 0;
boolean walking = false;
public void KeyPressed(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT || key == KeyEvent.VK_A) {
dx = -1;
still = i_left.getImage();
}
if (key == KeyEvent.VK_RIGHT || key == KeyEvent.VK_D) {
boolean walking = true;
if(walking){
w++;
if(w % 2 == 0){
still = i2.getImage();
} else {
still = i.getImage();
}
}
dx = 1;
}
if (key == KeyEvent.VK_UP || key == KeyEvent.VK_W || key == KeyEvent.VK_SPACE){
dy = 1;
still = i_jump.getImage();
}
if (key == KeyEvent.VK_F){
fire();
}
}
public void KeyReleased(KeyEvent e) {
int key = e.getKeyCode();
if (key == KeyEvent.VK_LEFT || key == KeyEvent.VK_A)
dx = 0;
if (key == KeyEvent.VK_RIGHT || key == KeyEvent.VK_D)
dx = 0;
walking = false;
w = 0;
if (key == KeyEvent.VK_UP || key == KeyEvent.VK_W || key == KeyEvent.VK_SPACE)
dy = 0;
still = i.getImage();
}
}
敌人等级：
package knowlesm.main;
import java.awt.Image;
import java.awt.*;
import java.awt.Rectangle;
import javax.swing.ImageIcon;
public class Enemy {
Image img;
int x, y;
boolean isAlive = true;
public Enemy(int startX, int startY, String location){
x = startX;
y = startY;
ImageIcon e = new ImageIcon(location);
img = e.getImage();
}
public Rectangle getBounds(){
return new Rectangle(x, y, 107, 100);
}
public int getX(){
return x;
}
public int getY(){
return y;
}
public boolean isAlive(){
return isAlive;
}
public Image getImage(){
return img;
}
public void move(int dx, int left)
{
if (dx == 1 && !((left + dx )< 150))//Added this to only move enemy when character moves forward (not back)
x = x - dx;
}
}
框架类：
package knowlesm.main;
import java.io.File;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.JFrame;
public class Frame {
public static void main (String args[]){
JFrame frame = new JFrame("2D Game");
frame.add(new Board());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(700, 365);
frame.setVisible(true);
playSound();
}
public static void playSound(){
try{
AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(new File("res/02-buckboard-chase.wav").getAbsoluteFile());
Clip clip = AudioSystem.getClip();
clip.open(audioInputStream);
clip.start();
}catch(Exception ex){
System.out.println("Error with playing sound.");
ex.printStackTrace();
}
}
}
碰撞检测属于板级。为什么它不适用于所有敌人类型？