mbostock/d3 — pull request #1466 by jasondavies (2013-08-17 01:04:00+00:00)
Title: Fix clipExtent intersection sorting.

The generic polygon clipping algorithm requires intersection points to
be sorted in a clockwise order around the clip edge. Previously, the
intersection points for 2D clipping in d3_geo_clipView were sorted in a
counterclockwise direction in screen pixels, probably because the
flipped y-axis in screen pixels was not being taken into account.