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Intersection points between paths
The `intersect` method of a path allows for the calculation of intersection
points between this path and the second path passed to the `intersect` method. ...
The return value of the intersect method is a tuple of two lists, where each
list contains parametrization instances for the intersection points. The first
list are the parameters for the path the `intersect` method was called for. The
second list are the parameter values for the path passed to the `intersect`
method. Thus we can calculate the first intersection point `x1, y1` by
x1, y1 = p1.at(a1)
as done in the example or alternatively by
x1, y1 = p2.at(b1)
! When several intersections between two paths occur, the order of the
intersection points is defined by the order in which the points are passed when
walking along the first path.
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