Question

我正在制作游戏，但我还在制作屏幕制作过程中。我做了一个黑色，深灰色，浅灰色和白色的spritesheet，我想让它们变成鲜艳的颜色，但是当我尝试初始化第一种颜色时，我得到一个ArryIndexOutOfBoundsExeption。

这是我需要帮助的课程的代码：

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问题，以便该例程消失，请随时回复;）

Answer 1

检查阵列的大小与您尝试访问的索引的对比。

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 = 16,383

16,383＆gt; 16,128，所以索引越界。

当我尝试使用颜色Java时，ArrayIndexOutOfBoundsExeption

1 个答案: