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71 lines
2.7 KiB
Plaintext
71 lines
2.7 KiB
Plaintext
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#include "script_component.hpp"
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/*
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* Author: LorenLuke
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* Returns an approximate representation of temperature at a unit's location.
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*
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* Arguments:
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* 0: Unit <OBJECT>
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*
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* Return Value:
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* None
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*
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* Example:
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* [ACE_player] call ace_weather_fnc_getApproximateAirTemp
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*
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* Public: No
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*/
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params ["_unit"];
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TRACE_1("params",_unit);
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if (isNil (format ["%1", _unit getVariable "ACE_airTemperatureBias"])) then {
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_unit setVariable ["ACE_airTemperatureBias", [-(random(3) + 1), random(3) + 1]];
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};
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private _temperature = ((getPosASL _unit) select 2) call EFUNC(weather,calculateTemperatureAtHeight);
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private _humidity = EGVAR(weather,currentHumidity);
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private _heatIndex = [_temperature, _humidity] call EFUNC(weather,calculateHeatIndex);
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private _chill = [_temperature, _humidity] call EFUNC(weather,calculateWindChill);
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private _e = 2^(1/(ln 2));
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/*
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// Windchill calc with wind vars; https://en.wikipedia.org/wiki/Wind_chill#Australian_Apparent_Temperature
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private _windspeed = [getPosASL _unit, true, true, true] call EFUNC(weather,calculateWindSpeed);
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private _water_vapor_pressure = _humidity * 6.105 *(_e ^ ((17.27 * _temperature)/(237.7 + _temperature))) / 100;
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private _chill = _temperature + (0.33 * _water_vapor_pressure) - (0.70 * _windspeed) - 400;
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*/
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// sigmoid = f(x) = L / (1 + e^(-k * (x - x_0)));
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// L max value, e = euler, k = steepness,
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// L = max value
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private _sigmoid_L = 1;
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// x_0 = sigmoid midpoint, aka 50% proportion; 18.5C, ~65F
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private _sigmoid_midpoint = 18.5;
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// place +- midpoint with desired proportion
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private _sigmoid_valuation = 8.5;
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// desired upper and proportion on sigmoid
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private _sigmoid_proportion_at_valuation = 0.95;
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private _sigmoid_proportion_at_lower_valuation = 1 - _sigmoid_proportion_at_valuation;
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// k = steepness
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private _sigmoid_k = (ln ((_sigmoid_proportion_at_lower_valuation^-1) - 1) ) / _sigmoid_valuation;
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// 5$/95% @ 10C/27C; [5% and 95% values at 50F and ~80F];
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// 5% = 0.05 = 1/20 = f(_midpoint - _valuation) = L / (1 + e^(-k * ((_midpoint - _valuation) - _midpoint)
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// (0.05)^-1 = 20 = (L / (1 + e^(-k * (-_valuation))) )^-1 = (1 + e^(-k * -_valuation))/L;
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// L = 1;> 20 = (1 + e^(k * valuation)); 20 - 1 = e^(k * valuation);
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// 19 = e^(k * 8.5); (log_e 19) = (k * 8.5); (log_e 19)/8.5 = k;
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// retrieve sigmoid proportion at _temperature
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private _temperature_sigmoid = _sigmoid_L / (1 + _e^(-_sigmoid_k * (_temperature - _sigmoid_midpoint)));
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// Weighted average between windchill and heat index based on sigmoid levels, plus +- 4deg randomisation
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private _apparent_temperature = ((_temperature_sigmoid * _heatIndex) + ((1 - _temperature_sigmoid) * _chill) + random(8) - 4);
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[_apparent_temperature, (_unit getVariable "ACE_airTemperatureBias")] call FUNC(displayAirTemp);
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