/// <summary>
/// 获取点的一个螺旋环内所有等高并没有被占用的cell
/// </summary>
HexagonsWithCenter GetSpiralRingsWithSameHeight(HexCell centerCell, int ringRadius)
{
if (centerCell.isTaken)
{
//中心点被占用
return(null);
}
List <HexCell> allResults = centerCell.GetSpiralRings(ringRadius);
if (allResults.Count != HexCell.GetSpiralRingCount(ringRadius))
{
//数量不足
return(null);
}
bool result = true;
int height = -1;
foreach (var tempCell in allResults)
{
if (tempCell.isTaken)
{
result = false;
break;
}
if (height < 0)
{
height = tempCell.height;
}
if (height != tempCell.height)
{
//高度不统一
result = false;
break;
}
}
if (result)
{
return(new HexagonsWithCenter(centerCell, allResults));
}
else
{
return(null);
}
}