Java BufferedImage.getRGB()——坐标越界

Question

所以，我正在尝试 BufferedImage 中特定像素的颜色...

public void LoadImageLevel (BufferedImage image) {

    int w = image.getWidth ();
    int h = image.getHeight ();

    System.out.println (w + " " + h);

    for (int xx = 0; xx < h; xx++) {

        for (int yy = 0; yy < w; yy++) {

            int pixel = image.getRGB (xx, yy);

            int red = (pixel >> 16) & 0xff;
            int green = (pixel >> 8) & 0xff;
            int blue = (pixel) & 0xff;

            if (red == 255 && green == 255 && blue == 255) {

                handler.addObject (new Block (xx * 32, yy * 32, ObjectID.Block, 32, 32));
            }
        }
    }
}

它是从 Main 类构造函数调用的:

    ImageLoader imageLoader = new ImageLoader ();

    level = imageLoader.loadImage ("/levels/level_test.png");

    LoadImageLevel (level);

BufferedImage 是从我的 BufferedImageLoader 类加载的:

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;

public class ImageLoader {

    private BufferedImage image;

    public BufferedImage loadImage (String path) {

        try {

            image = ImageIO.read (getClass ().getResource (path));

        } catch (IOException e) {

            e.printStackTrace ();
        }

        return image;
    }
}

当我运行该项目时，出现此错误:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException:   Coordinate out of bounds!
    at sun.awt.image.ByteInterleavedRaster.getDataElements(Unknown Source)
    at java.awt.image.BufferedImage.getRGB(Unknown Source)
    at com.main.index.Game.LoadImageLevel(Game.java:190)
    at com.main.index.Game.<init>(Game.java:41)
    at com.main.index.Game.main(Game.java:206)

第190行是“int Pixel = image.getRGB(xx, yy);”，第41行是构造函数中调用它的地方，第206行是main方法。

<小时/>

提前致谢! ^_^

Answer 1

问题出在这里:

int pixel = image.getRGB (xx, yy);

应该是:

int pixel = image.getRGB (yy, xx);