如果最后一个点不匹配第一个点，则在最后一个点和第一个点之间添加一条附加曲线段以使其闭合。
If the last point does not match the first point, an additional curve segment is added from the last point to the first point to close it.
如果最后一个点不匹配第一个点，则在最后一个点和第一个点之间添加一条附加曲线段以使该图闭合。
If the last point does not match the first point, an additional curve segment is added from the last point to the first point to close the figure.
我们在几何图形上取一个点，即形心点，计算那个点在空间填充曲线上的值，并将结果存储在一个附加的列中。
We take a point on the geometry — the centroid — compute the value for that point on the space filling curve, and store the result in an additional column.
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