Hexagonal Grids, how do you find which hexagon a point is in?

Question

I have a map made up of rows and columns of hexagons

This isn\'t an actual image of the hex-map I am using,

Answer 1

I dont know if it's going to help anyone but i have come up with a much simpler solution. When i create my Hexagon im just giving them a middle point and by finding the closest middle point with the mouse coordonate i can find wich one im on !