ACE3/addons/common/functions/fnc_getMapGridData.sqf

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#include "script_component.hpp"
/*
* Author: PabstMirror
* Finds real x/y offset and map step for a 10 digit grid
* Save time by preparing data one time at startup
* Ideas from Nou's mapGridToPos and BIS_fnc_gridToPos
*
* Arguments:
* None
*
* Return Value:
* None
*
* Example:
* [] call ace_common_fnc_getMapGridData
*
* Public: No
*/
GVAR(mapGridData) = [];
//--- Extract grid values from world config (Borrowed from BIS_fnc_gridToPos)
private _cfgGrid = configFile >> "CfgWorlds" >> worldName >> "Grid";
private _offsetX = getNumber (_cfgGrid >> "offsetX");
private _offsetY = getNumber (_cfgGrid >> "offsetY");
private _zoomMax = 1e38;
private _formatX = "";
private _formatY = "";
private _stepX = 1e10;
private _stepY = 1e10;
{
private _zoom = getnumber (_x >> "zoomMax");
if (_zoom < _zoomMax) then {
_zoomMax = _zoom;
_formatX = getText (_x >> "formatX");
_formatY = getText (_x >> "formatY");
_stepX = getNumber (_x >> "stepX");
_stepY = getNumber (_x >> "stepY");
};
false
} count configProperties [_cfgGrid, "isClass _x", false];
private _letterGrid = false;
if (toLower _formatX find "a" != -1) then {_letterGrid = true};
if (toLower _formatY find "a" != -1) then {_letterGrid = true};
if (_letterGrid) exitWith {
WARNING_3("Map Grid Warning (%1) - Map uses letter grids [%2, %3]",worldName,_formatX,_formatY);
};
//Start at [0, 500] and move north until we get a change in grid
private _heightOffset = 500;
private _startGrid = mapGridPosition [0, _heightOffset];
private _originGrid = _startGrid;
while {_startGrid == _originGrid} do {
_heightOffset = _heightOffset + 1;
_originGrid = mapGridPosition [0, _heightOffset];
};
//Calculate the real y offset
private _realOffsetY = (parseNumber (_originGrid select [count _formatX, count _formatY])) * _stepY + _heightOffset - 1;
//Calculate MGRS 10digit step - they should both be 1 meter:
private _stepXat5 = _stepX * 10 ^ ((count _formatX) - 5);
private _stepYat5 = -1 * _stepY * 10 ^ ((count _formatY) - 5);
if (_stepYat5 < 0) then {
TRACE_1("Northing is reversed",worldName);
};
if (_stepXat5 != 1) then {
TRACE_2("MGRS 10 digit grid does not equal 1 meter",_stepXat5,worldName);
};
if (_stepYat5 != 1 && {_stepYat5 != -1}) then {
TRACE_2("MGRS 10 digit grid does not equal 1 meter",_stepYat5,worldName);
};
GVAR(mapGridData) = [_offsetX, _realOffsetY, _stepXat5, _stepYat5];