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

This is an addendum to SebastianTroy's answer. I would leave it as a comment but I don't enough reputation yet.

If you want to implement an axial coordinate system as described here: http://www.redblobgames.com/grids/hexagons/

You can make a slight modification to the code.

Instead of

// Is the row an odd number?
if (rowIsOdd)// Yes: Offset x to match the indent of the row
    column = (int) ((x - halfWidth) / gridWidth);
else// No: Calculate normally
    column = (int) (x / gridWidth);

use this

float columnOffset = row * halfWidth;
column = (int)(x + columnOffset)/gridWidth; //switch + to - to align the grid the other way

This will make the coordinate (0, 2) be on the same diagonal column as (0, 0) and (0, 1) instead of being directly below (0, 0).