c# - 如何创建磁贴系统

Question

与其为每个图 block 创建单独的案例，不如这样做更好的方法是什么？

public void Draw(SpriteBatch spriteBatch, Level level)
    {
        for (int row = 0; row < level._intMap.GetLength(1); row++) {
            for (int col = 0; col < level._intMap.GetLength(0); col++) {
                switch (level._intMap[col, row]) {
                    case 0:
                        spriteBatch.Draw(_texture, new Rectangle(row * _tileWidth, col * _tileHeight, _tileWidth, _tileHeight), new Rectangle(0 * _tileWidth, 0 * _tileHeight, _tileWidth, _tileHeight), Color.White);
                        break;
                    case 1:
                        spriteBatch.Draw(_texture, new Rectangle(row * _tileWidth, col * _tileHeight, _tileWidth, _tileHeight), new Rectangle(1 * _tileWidth, 0 * _tileHeight, _tileWidth, _tileHeight), Color.White);
                        break;
                    case 2:
                        spriteBatch.Draw(_texture, new Rectangle(row * _tileWidth, col * _tileHeight, _tileWidth, _tileHeight), new Rectangle(2 * _tileWidth, 0 * _tileHeight, _tileWidth, _tileHeight), Color.White);
                        break;
                    case 3:
                        spriteBatch.Draw(_texture, new Rectangle(row * _tileWidth, col * _tileHeight, _tileWidth, _tileHeight), new Rectangle(3 * _tileWidth, 0 * _tileHeight, _tileWidth, _tileHeight), Color.White);
                        break;

                }
            }
        }
    }

Answer 1

不需要case语句，只需要使用一个变量。

var n = level._intMap[col, row];
spriteBatch.Draw(_texture, 
    new Rectangle(row * _tileWidth, col * _tileHeight, _tileWidth, _tileHeight), 
    new Rectangle(n * _tileWidth, 0 * _tileHeight, _tileWidth, _tileHeight), Color.White
);

如果您需要将输出限制为值 0-3(如 case 语句的效果)，那么最好使用条件 if (n >= 0 && n <= 3) { } .