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71 lines
2.8 KiB
Plaintext
71 lines
2.8 KiB
Plaintext
/*
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* Author: Ruthberg, MikeMatrix, joko // Jonas
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*
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* Calculates the muzzle velocity shift caused by different barrel lengths
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*
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* Arguments:
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* 0: barrel length - mm
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* 1: muzzle velocity lookup table - m/s <ARRAY>
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* 2: barrel length lookup table - mm <ARRAY>
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* 3: muzzle velocity - m/s <NUMBER>
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*
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* Return Value:
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* muzzle velocity shift - m/s <NUMBER>
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*
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* Public: No
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*/
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#include "script_component.hpp"
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scopeName "main";
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private ["_muzzleVelocityTableCount", "_barrelLengthTableCount", "_lowerDataIndex",
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"_upperDataIndex", "_lowerBarrelLength", "_upperBarrelLength", "_lowerMuzzleVelocity",
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"_upperMuzzleVelocity", "_interpolationRatio"];
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params ["_barrelLength", "_muzzleVelocityTable", "_barrelLengthTable", "_muzzleVelocity"];
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// If barrel length is not defined, then there is no point in calculating muzzle velocity
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if (_barrelLength == 0) exitWith { 0 };
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_muzzleVelocityTableCount = count _muzzleVelocityTable;
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_barrelLengthTableCount = count _barrelLengthTable;
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// Exit if tables are different sizes, have no elements or have only one element
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if (_muzzleVelocityTableCount != _barrelLengthTableCount || _muzzleVelocityTableCount == 0 || _barrelLengthTableCount == 0) exitWith { 0 };
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if (_muzzleVelocityTableCount == 1) exitWith { (_muzzleVelocityTable select 0) - _muzzleVelocity };
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// If we have the precise barrel length value, return result immediately
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if (_barrelLength in _barrelLengthTable) exitWith {
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(_muzzleVelocityTable select (_barrelLengthTable find _barrelLength)) - _muzzleVelocity
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};
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// Limit values to lower and upper bound of data we have available
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if (_barrelLength <= (_barrelLengthTable select 0)) exitWith { (_muzzleVelocityTable select 0) - _muzzleVelocity };
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if (_barrelLength >= (_barrelLengthTable select _barrelLengthTableCount - 1)) exitWith { (_muzzleVelocityTable select _barrelLengthTableCount - 1) - _muzzleVelocity };
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// Find closest bordering values for barrel length
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{
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if (_barrelLength <= _x) then {
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_upperDataIndex = _forEachIndex;
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_lowerDataIndex = _upperDataIndex - 1;
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breakTo "main";
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};
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} forEach _barrelLengthTable;
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// Worst case scenario
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if (isNil "_lowerDataIndex" || isNil "_upperDataIndex") exitWith {0};
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_lowerBarrelLength = _barrelLengthTable select _lowerDataIndex;
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_upperBarrelLength = _barrelLengthTable select _upperDataIndex;
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_lowerMuzzleVelocity = _muzzleVelocityTable select _lowerDataIndex;
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_upperMuzzleVelocity = _muzzleVelocityTable select _upperDataIndex;
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// Calculate interpolation ratio
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_interpolationRatio = if (abs (_lowerBarrelLength - _upperBarrelLength) > 0) then {
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(_upperBarrelLength - _barrelLength) / (_upperBarrelLength - _lowerBarrelLength)
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} else {
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0
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};
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// Calculate interpolated muzzle velocity shift
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(_lowerMuzzleVelocity + ((_upperMuzzleVelocity - _lowerMuzzleVelocity) * (1 - _interpolationRatio))) - _muzzleVelocity // Return
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