Finding grid sector from coordinates

I’d been looking at FLLocator for a while trying to figure out what maths it was using, but along comes Cannon with the problem already solved in the player control plugin.

Just thought I would put this here so I don’t lose it, and maybe it will be useful to somebody else. Adapted to C# from C++, but is easy to implement in other languages:

        static string gridReferenceFromPos(int vPosX, int vPosZ, float systemScale = 1.0f)
        {
            string[] gridLabelX = { "A", "B", "C", "D", "E", "F", "G", "H" };
            int[] gridLabelZ = { 1, 2, 3, 4, 5, 6, 7, 8 };

            float fGridSize = 34000.0f / systemScale;

            int gridRefIntX = (int)((vPosX + (fGridSize * 5)) / fGridSize) - 1;
            int gridRefIntZ = (int)((vPosZ + (fGridSize * 5)) / fGridSize) - 1;

            if (gridRefIntX >= 0 && gridRefIntX < 8 && gridRefIntZ >= 0 && gridRefIntZ < 8)
                return gridLabelX[gridRefIntX] + gridLabelZ[gridRefIntZ].ToString();
            else
                return "ERR";
        }

The systemScale float comes from the system definition in universe.ini - if the system doesn’t have one, it’s 1.0f (default).