I have a game engine which handles hexagon based war games and things like LOS, etc, for both flat and tip up hexes. A particular game I'm implementing at the moment, Band of Brothers, has facing for vehicles and, optionally, for infantry.
I've searched the web and have not found any algorithm to handle determining the hexagons that fall within an arc expanding out from a hexagon. Here are some pictures to describe what I'm talking about:
I represent the hexagon locations as offset coordinates, and have the values for all the dimensions of each hexagon and the endpoints of the vertices and center in relation to the overall map stored as doubles. I also convert to cube coordinates for determining distance.
Just looking for ideas or pointers on how I might determine these hexagons.
EDIT: I do not have a rep > 10 so I can't add a picture of offset coordinates. There is a good one here on gamedev though. Here's an ASCII art representation of it. The numbers will be a little different depending on which row is indented:
0,0 1,0 2,0 3,0 4,0 0,1 1.1 2.1 3.1 0,2 1,2 2,2 3,2 4,2