本文考虑点到直线距离意义下的干线或设施位置选择。
We consider location problems with distance from point to line.
用解析几何的公式直接计算某个点的坐标、点与点之间的距离、点到直线的距离等。
The coordinate of a certain point, the distances between points and distances from point to line are directly calculated with the analytic geometry formula.
锯齿波从某一始点到某一终点沿着一条直线上升(或者下降)，在终点的时候它马上跃迁回其起始值。
A sawtooth wave rises (or falls) in a straight line from a starting point to an ending point, at which time it instantaneously jumps back to the starting value.
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