static void DrawGrid(VoxelBuilder target)
    {
        var X = target.GetX(); var Y = target.GetY();
        var nowHeight = target.GetNowFlowerHeight();
        var original  = target.transform.position + nowHeight;

        //畫直線
        var yLine  = Y * VoxelBuilder.yUnit * Vector3.forward;
        var offset = VoxelBuilder.xUnit * Vector3.right;
        var from   = original;

        for (var x = 1; x <= X + 1; ++x)
        {
            Gizmos.DrawLine(from, from + yLine);
            from = from + offset;
        }

        //畫橫線
        offset = VoxelBuilder.yUnit * Vector3.forward;
        var xLine = X * VoxelBuilder.xUnit * Vector3.right;;

        from = original;
        for (var y = 1; y <= Y + 1; ++y)
        {
            Gizmos.DrawLine(from, from + xLine);
            from = from + offset;
        }
    }