geoContains is not working

[psi-gh]

According to geoContains method, the center of Moscow is not contained in Moscow Area (it returned false), which is a strange fact :) Code snippet to test:
https://runkit.com/embed/cw2rh9zbcbcr
(or in gist https://gist.github.com/psi-gh/6f8e7b356f2bb5086cb98c58fbd0d588)

[Fil]

Your polygon appears to be counterclockwise, but d3 expects a clockwise order (contrary to GeoJSON spec). http://bl.ocks.org/Fil/263ffe9c05523d2950dac83a44ec1b06 https://github.com/d3/d3-geo/#d3-geo https://tools.ietf.org/html/rfc7946

[psi-gh]

Oh thanks Fil! So i forced to use other library.

[mbostock]

You can reverse the coordinates of the polygon rings to flip the winding order.

[mbostock]

Standard GeoJSON is planar rather than spherical, so if we implement path.contains #109 it would be easy to test for containment using d3.geoIdentity as the projection.

[iway1]

probably better off just using this: https://stackoverflow.com/questions/22521982/check-if-point-is-inside-a-polygon

geoContains some times does not even work when the coords are counter clockwise. =/