Java Slick2d - 从 spritesheet 加载图 block 抛出异常

Question

block 类

public class Block {

public enum BlockType {
    Dirt,
    Grass,
    Selection
}

BlockType Type;
Vector2f Position;
Image texture;
boolean breakable;

public Block(BlockType Type, Vector2f Position, Image texture, boolean breakable) {
    this.Type = Type;
    this.Position = Position;
    this.texture = texture;
    this.breakable = breakable;
}

public BlockType getType() { 
    return Type; 
}
public void setType(BlockType value) {
    Type = value;
}

public Vector2f getPosition() { 
    return Position; 
}
public void setPosition(Vector2f value) { 
    Position = value; 
}

public Image gettexture() { 
    return texture; 
}
public void settexture(Image value) { 
    texture = value; 
}

public boolean getbreakable() { 
    return breakable; 
}
public void setbreakable(boolean value) { 
    breakable = value; 
}

}

图 block 生成类

public class TileGen {

Block block;
public Block[] tiles = new Block[3];
public int width, height;
public int[][] index;
boolean selected;
int mouseX, mouseY;
int tileX, tileY;

Image dirt, grass, selection;
SpriteSheet tileSheet;

public void init() throws SlickException {
    tileSheet = new SpriteSheet("assets/tiles/tileSheet.png", 64, 64, new Color(0,0,0));

    grass = tileSheet.getSprite(0,0);
    dirt = tileSheet.getSprite(64,0);
    selection = tileSheet.getSprite(128,0);

    tiles[0] = new Block(BlockType.Grass, new Vector2f(tileX,tileY), grass, true);
    tiles[1] = new Block(BlockType.Dirt, new Vector2f(tileX,tileY), dirt, true);

    width = 50;
    height = 50;

    index = new int[width][height];

    Random rand = new Random();
    for (int x = 0; x < width; x++)
    {
        for (int y = 0; y < height; y++)
        {
            index[x][y] = rand.nextInt(2);
        }
    }
}

public void update(GameContainer gc) {
    Input input = gc.getInput();
    mouseX = input.getMouseX();
    mouseY = input.getMouseY();
    tileX = mouseX / width;
    tileY = mouseY / height;

    if(input.isMouseButtonDown(Input.MOUSE_LEFT_BUTTON)) {
        selected = true;
    }
    else{
        selected = false;
    }
    System.out.println(tileX);
}

public void render() {
    for (int x = 0; x < width; x++)
    {
        for (int y = 0; y < height; y++)
        {
            tiles[index[x][y]].texture.draw(x * 64, y *64);

            if(IsMouseInsideTile(x, y))
                selection.draw(x * 64, y * 64);
            if(selected && tiles[index[x][y]].breakable) {
                if(tiles[index[tileX][tileY]].texture == grass)
                    tiles[index[tileX][tileY]].texture = dirt;
            }
        }
    }
}

public boolean IsMouseInsideTile(int x, int y)
{
    return (mouseX >= x * 64 && mouseX <= (x + 1) * 64 &&
            mouseY >= y * 64 && mouseY <= (y + 1) * 64);
}

我不确定我做错了什么，我是 slick2d 的新手。当我尝试从 Sprite 表初始化图 block 时，它会抛出异常。我的tileGen 类中的init 就是问题所在。

Exception in thread "main" java.lang.RuntimeException: SubImage out of sheet bounds: 64,0
at org.newdawn.slick.SpriteSheet.getSprite(SpriteSheet.java:208)
at com.synyst3r1.game.TileGen.init(TileGen.java:32)
at com.synyst3r1.game.Game.init(Game.java:23)
at org.newdawn.slick.AppGameContainer.setup(AppGameContainer.java:390)
at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:314)
at com.synyst3r1.game.Game.main(Game.java:50)

Answer 1

getSprite() 中的 (x, y)是单元位置，而不是像素位置。因此，您需要 getSprite(1, 0) 和 getSprite(2, 0)(假设您的图像为 192x64)。