ArrayIndexOutOfBoundsExeption当我尝试使用Java颜色时

Question

我正在制作一款游戏，但我仍在制作屏幕。我已经用黑色、深灰色、浅灰色和白色制作了一个精灵表，我想让它们变成明亮的颜色，但当我尝试初始化第一种颜色时，我得到了ArryIndexOutOfBoundsExeption。

这是我想要帮助的类的代码：

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_MASK];
public int[] colours = new int[MAP_WIDTH * MAP_WIDTH_MASK * 4];
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++ ){
        colours[i*4+0] = 0xff00ff;
        colours[i*4+1] = 0x00ffff;
        colours[i*4+2] = 0xffff00;
        colours[i*4+3] = 0xffffff;
    }
}
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(yMax > height) yMax = height;
        for(int xTile = xOffset >> 3; xTile <=(xOffset + width) >> 3; xTile++){
            int xMin = xTile * 8 - yOffset;
            int xMax = xMin + 8;
            if(xMin < 0) xMin = 0;
            if(xMax > 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 colour = tileIndex * 4 + sheet.pixels[sheetPixel++];
                    pixels[tilePixel++] = colours[colour];
                }
            }
        }
    }
}

如果有人知道如何解决这个问题，这样就没有了解释，请随意回复；）

Answer 1

检查数组的大小与您试图访问的索引。

public int[] colours = new int[MAP_WIDTH * MAP_WIDTH_MASK * 4];

64*63*4=16128

计数器的最大值为64*64-1=4095

colours[i*4 + 3] == colours[4095*4 + 3] 

4095*4+3=16383

16383>16128，因此索引越界。