瓷砖添加到螺旋的顺序如下图所示:
.
+----+----+----+----+----+
| 25 | 10 | 11 | 12 | 13 |
+----+----+----+----+----+
| 24 | 9 | 2 | 3 | 14 |
+----+----+----+----+----+
| 23 | 8 | 1 | 4 | 15 |
+----+----+----+----+----+
| 22 | 7 | 6 | 5 | 16 |
+----+----+----+----+----+
| 21 | 20 | 19 | 18 | 17 |
+----+----+----+----+----+
(结束)
|