H:j d gZ d ZdS ) ramerdouglasc t | dk r| S | d | d k r| d | d fn| d | d f\ }}|d |d z
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dz |dz |dz z z Ht | } | |dz k r||gS t | dk rt | dz } n| | } t | d| dz | t | | dz d | dd z S ) a Does Ramer-Douglas-Peucker simplification of a curve with `dist`
threshold.
`line` is a list-of-tuples, where each tuple is a 2D coordinate
Usage is like so:
>>> myline = [(0.0, 0.0), (1.0, 2.0), (2.0, 1.0)]
>>> simplified = ramerdouglas(myline, dist = 1.0)
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