如清单5所示，如果使用约束的话，产生一个沿着圆形轨迹移动的视图非常容易。
As you can see in Listing 5, making a view orbit around in a circular path is very easy if you utilize constraints.
这是一楼的右视图；左边就是圆形的大厅，右边则是咖啡厅，大家可以自由地沟通。
Here is the right view of the first floor; on the left you can see the circular hall and on the right an open cafe to communicate freely.
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