libpysal.cg.is_clockwise

libpysal.cg.is_clockwise(vertices)

Returns whether a list of points describing a polygon are clockwise or counterclockwise.

Parameters:

verticeslist

A list of points that form a single ring.

Returns:

clockwisebool

True if vertices are clockwise, otherwise False.

See also

libpysal.cg.ccw

Examples

>>> is_clockwise([Point((0, 0)), Point((10, 0)), Point((0, 10))])
False

>>> is_clockwise([Point((0, 0)), Point((0, 10)), Point((10, 0))])
True

>>> v = [
...     (-106.57798, 35.174143999999998),
...     (-106.583412, 35.174141999999996),
...     (-106.58417999999999, 35.174143000000001),
...     (-106.58377999999999, 35.175542999999998),
...     (-106.58287999999999, 35.180543),
...     (-106.58263099999999, 35.181455),
...     (-106.58257999999999, 35.181643000000001),
...     (-106.58198299999999, 35.184615000000001),
...     (-106.58148, 35.187242999999995),
...     (-106.58127999999999, 35.188243),
...     (-106.58138, 35.188243),
...     (-106.58108, 35.189442999999997),
...     (-106.58104, 35.189644000000001),
...     (-106.58028, 35.193442999999995),
...     (-106.580029, 35.194541000000001),
...     (-106.57974399999999, 35.195785999999998),
...     (-106.579475, 35.196961999999999),
...     (-106.57922699999999, 35.198042999999998),
...     (-106.578397, 35.201665999999996),
...     (-106.57827999999999, 35.201642999999997),
...     (-106.57737999999999, 35.201642999999997),
...     (-106.57697999999999, 35.201543000000001),
...     (-106.56436599999999, 35.200311999999997),
...     (-106.56058, 35.199942999999998),
...     (-106.56048, 35.197342999999996),
...     (-106.56048, 35.195842999999996),
...     (-106.56048, 35.194342999999996),
...     (-106.56048, 35.193142999999999),
...     (-106.56048, 35.191873999999999),
...     (-106.56048, 35.191742999999995),
...     (-106.56048, 35.190242999999995),
...     (-106.56037999999999, 35.188642999999999),
...     (-106.56037999999999, 35.187242999999995),
...     (-106.56037999999999, 35.186842999999996),
...     (-106.56037999999999, 35.186552999999996),
...     (-106.56037999999999, 35.185842999999998),
...     (-106.56037999999999, 35.184443000000002),
...     (-106.56037999999999, 35.182943000000002),
...     (-106.56037999999999, 35.181342999999998),
...     (-106.56037999999999, 35.180433000000001),
...     (-106.56037999999999, 35.179943000000002),
...     (-106.56037999999999, 35.178542999999998),
...     (-106.56037999999999, 35.177790999999999),
...     (-106.56037999999999, 35.177143999999998),
...     (-106.56037999999999, 35.175643999999998),
...     (-106.56037999999999, 35.174444000000001),
...     (-106.56037999999999, 35.174043999999995),
...     (-106.560526, 35.174043999999995),
...     (-106.56478, 35.174043999999995),
...     (-106.56627999999999, 35.174143999999998),
...     (-106.566541, 35.174144999999996),
...     (-106.569023, 35.174157000000001),
...     (-106.56917199999999, 35.174157999999998),
...     (-106.56938, 35.174143999999998),
...     (-106.57061499999999, 35.174143999999998),
...     (-106.57097999999999, 35.174143999999998),
...     (-106.57679999999999, 35.174143999999998),
...     (-106.57798, 35.174143999999998)
... ]
>>> is_clockwise(v)
True