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I know there are manual ways of doing this (see Point in Polygon), but is there a native way of determining whether a point is inside a polygon, in d3.js?
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Draw a horizontal line to the right of each point and extend it to infinity. Count the number of times the line intersects with polygon edges. A point is inside the polygon if either count of intersections is odd or point lies on an edge of polygon.
How to check if a point is inside a polygon in Python. To perform a Point in Polygon (PIP) query in Python, we can resort to the Shapely library's functions . within(), to check if a point is within a polygon, or . contains(), to check if a polygon contains a point.
Update: this is now part of d3-polygon.
d3.polygonContains(polygon, point)
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