ACE3/addons/vector/functions/fnc_getRelativeAzimuthDistance.sqf

#include "..\script_component.hpp"
/*
 * Author: commy2
 *
 *
 * Arguments:
 * None
 *
 * Return Value:
 * Array <ARRAY>
 *
 * Example:
 * call ace_vector_fnc_getRelativeAzimuthDistance
 *
 * Public: No
 */

GVAR(pData) params ["_distanceP1", "_directionP1"];
_directionP1 params ["_azimuthP1", "_inclinationP1"];

private _distanceP2 = call FUNC(getDistance);
private _directionP2 = call FUNC(getDirection);
_directionP2 params ["_azimuthP2", "_inclinationP2"];

private _relDirection = sqrt ((_azimuthP1 - _azimuthP2) ^ 2 + (_inclinationP1 - _inclinationP2) ^ 2);
private _relDistance = sqrt (_distanceP1 ^ 2 + _distanceP2 ^ 2 - 2 * _distanceP1 * _distanceP2 * cos _relDirection);
private _relHeight = (sin _inclinationP1 * _distanceP1) - (sin _inclinationP2 * _distanceP2);
private _relLength = sqrt (_relDistance ^ 2 - _relHeight ^ 2); if (str(_relLength) == "-1.#IND") then {_relLength = 0};

private _lenghtP1 = cos _inclinationP1 * _distanceP1;
private _lenghtP2 = cos _inclinationP2 * _distanceP2;
private _relAzimuth = (sin _azimuthP2 * _lenghtP2 - sin _azimuthP1 * _lenghtP1) atan2 (cos _azimuthP2 * _lenghtP2 - cos _azimuthP1 * _lenghtP1);
if (_relAzimuth < 0) then {_relAzimuth = _relAzimuth + 360};

if (_distanceP1 < -999 || {_distanceP2 < -999}) exitWith {
    [-1000, -1000]    // return
};

[_relAzimuth, _relLength]