我一直在通过 youtube 教程制作一款游戏，你们中的一些人可能会认为它是 designsbyzephr 提供的一款游戏，并且遇到了问题。我相当确定代码是正确的，因为我之前在之前的项目中使用过这个调用。即使使用 github 上发布的完整项目源代码，我也会遇到数组越界异常。有什么建议么？
package Game;
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import javax.swing.JFrame;
import GFX.Screen;
import GFX.SpriteSheet;
public class Game extends Canvas implements Runnable {
private static final long serialVersionUID = 1L;
public static final int WIDTH = 160;
public static final int HEIGHT = WIDTH / 12 * 9;
public static final int SCALE = 3;
public static final String NAME = "Game";
private JFrame frame;
public boolean running = false;
public int tickcount = 0;
private BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
private int[] pixels = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
private Screen screen;
public Game() {
setMinimumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
setMaximumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
setPreferredSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
frame = new JFrame(NAME);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(this, BorderLayout.CENTER);
frame.pack();
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public void init() {
screen = new Screen(WIDTH, HEIGHT, new SpriteSheet("/Sprites/spritesheet.png"));
}
public void render() {
BufferStrategy bs = getBufferStrategy();
if (bs == null) {
createBufferStrategy(3);
return;
}
screen.render(pixels, 0, WIDTH);
Graphics g = bs.getDrawGraphics();
g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
g.dispose();
bs.show();
}
public synchronized void start() {
running = true;
new Thread(this).start();
}
public synchronized void stop() {
running = false;
}
public void run() {
long lastTime = System.nanoTime();
double nsPerTick = 1000000000D / 60D;
int ticks = 0;
int frames = 0;
long lastTimer = System.currentTimeMillis();
double delta = 0;
init();
while (running) {
long now = System.nanoTime();
delta += (now - lastTime) / nsPerTick;
lastTime = now;
boolean shouldRender = true;
while (delta >= 1) {
ticks++;
tick();
delta -= 1;
shouldRender = true;
}
try {
Thread.sleep(2);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (shouldRender) {
frames++;
render();
}
if (System.currentTimeMillis() - lastTimer >= 1000) {
lastTimer += 1000;
frames = 0;
ticks = 0;
}
}
}
public void tick() {
tickcount++;
for (int i = 0; i < pixels.length; i++)
pixels[i] = i + tickcount;
}
public static void main(String[] args) {
new Game().start();
}
}
package GFX;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
public class SpriteSheet {
public String path;
public int width;
public int height;
public int[] pixels;
public SpriteSheet(String path) {
BufferedImage image = null;
try
{
image = ImageIO.read(SpriteSheet.class.getResourceAsStream(path));
}
catch (IOException e)
{
e.printStackTrace();
}
if (image == null) return;
this.path = path;
this.width = image.getWidth();
this.height = image.getHeight();
pixels = image.getRGB(0, 0, width, height, null, 0, width);
for (int i = 0; i < pixels.length; i++) {
pixels[i] = (pixels[i] & 0xff) / 64;
}
for (int i = 0; i < 8; i++)
System.out.println(pixels[i]);
}
}
package GFX;
public class Screen {
public static final int MAP_WIDTH = 64;
public static final int MAP_WIDTH_MASK = MAP_WIDTH - 1;
public int[] tiles = new int[MAP_WIDTH * MAP_WIDTH];
public int[] colors = new int[MAP_WIDTH * MAP_WIDTH];
public int xOffset = 0;
public int yOffset = 0;
public int width;
public int height;
public SpriteSheet sheet;
public Screen(int width, int height, SpriteSheet sheet) {
this.width = width;
this.height = height;
this.sheet = sheet;
for (int i = 0; i < MAP_WIDTH * MAP_WIDTH; i++) {
colors[i * 4 + 0] = 0xff00ff;
colors[i * 4 + 1] = 0x00ffff;
colors[i * 4 + 2] = 0xffff00;
colors[i * 4 + 3] = 0x0000ff;
}
}
public void render(int[] pixels, int offset, int row) {
for (int yTile = yOffset >> 3; yTile <= (yOffset + height) >> 3; yTile++) {
int yMin = yTile * 8 - yOffset;
int yMax = yMin + 8;
if (yMin < 0)
yMin = 0;
if (yMin > height)
yMax = height;
for (int xTile = xOffset >> 3; xTile <= (xOffset + width) >> 3; xTile++) {
int xMin = xTile * 8 - xOffset;
int xMax = xMin + 8;
if (xMin < 0)
xMin = 0;
if (xMin > width)
xMax = width;
int tileIndex = (xTile & (MAP_WIDTH_MASK))
+ (yTile & (MAP_WIDTH_MASK)) * MAP_WIDTH;
for (int y = yMin; y < yMax; y++) {
int sheetPixel = ((y + yOffset) & 7) * sheet.width
+ ((xMin + xOffset) & 7);
int tilePixel = offset + xMin + y * row;
for (int x = xMin; x < xMax; x++) {
int color = tileIndex * 4 + sheet.pixels[sheetPixel++];
pixels[tilePixel++] = colors[color];
}
}
}
}
}
}
这就是到目前为止的所有代码。错误如下 线程“Thread-2”中的异常 java.lang.IllegalArgumentException: input == null！在 javax.imageio.ImageIO.read(Unknown Source) 在 GFX.SpriteSheet.(SpriteSheet.java:22) 在 Game.Game.init(Game.java:54) 在 Game.Game.run(Game.java:91)在 java.lang.Thread.run（未知来源）