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Background: I use code from An Efficient Test For A Point To Be In A Convex Polygon Wolfram Demonstration to check if a point ( mouse pointer ) is in a ( convex ) polygon. Clearly this code fails for concave polygons.

Question: I am looking for an efficient routine to check if a 2D-point is in a polygon.

Background: I use code from An Efficient Test For A Point To Be In A Convex Polygon Wolfram Demonstration to check if a point ( mouse pointer ) is in a ( convex ) polygon. Clearly this code fails for non-convex polygons.

Question: I am looking for an efficient routine to check if a 2D-point is in a polygon.

Background: I use code from http://demonstrations.wolfram.com/AnEfficientTestForAPointToBeInAConvexPolygon/ Wolfram Demonstration to check if a point ( mouse pointer ) is in a ( convex ) polygon. Clearly this code fails for non-convex polygons.

Question: I am looking for an efficient routine to check if a 2D-point is in a polygon.

Background: I use code from An Efficient Test For A Point To Be In A Convex Polygon Wolfram Demonstration to check if a point ( mouse pointer ) is in a ( convex ) polygon. Clearly this code fails for concave polygons.

Question: I am looking for an efficient routine to check if a 2D-point is in a polygon.