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86 lines
2.6 KiB
Plaintext
86 lines
2.6 KiB
Plaintext
#include "script_component.hpp"
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/*
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* Author: KoffeinFlummi
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* Calculates the angle offset necessary to hit the current target.
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*
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* Arguments:
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* 0: distance to target in meters <NUMBER>
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* 1: current angle of the turret <NUMBER>
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* 2: maximum elevation of the turret <NUMBER>
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* 3: initSpeed of the projectile <NUMBER>
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* 4: airFriction of the projectile <NUMBER>
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* 5: maximum timeToLive of the projectile <NUMBER>
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* 6: simulationStep of the projectile <NUMBER>
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*
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* Return Value:
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* offset from the current angle necessary to hit the target <NUMBER>
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*
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* Example:
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* [1, 2, 3, 4, 5, 6, 7] call ace_fcs_fnc_getAngle
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*
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* Public: No
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*/
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#define PRECISION 0.1
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params ["_distance", "_angleTarget", "_maxElev", "_initSpeed", "_airFriction", "_timeToLive", "_simulationStep"];
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if (_simulationStep == 0) exitWith {_angleTarget};
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private _fnc_traceBullet = {
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params ["_distance", "_angleTarget", "_maxElev", "_initSpeed", "_airFriction", "_timeToLive", "_simulationStep", "_angle"];
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_angle = _angle - _angleTarget;
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_angleTarget = 0;
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private _posTargetX = (cos _angleTarget) * _distance;
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private _posTargetY = (sin _angleTarget) * _distance;
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private _posX = 0;
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private _posY = 0;
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private _velocityX = (cos _angle) * _initSpeed;
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private _velocityY = (sin _angle) * _initSpeed;
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// trace the path of the bullet
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for "_i" from 1 to ((floor (_timeToLive / _simulationStep)) + 1) do {
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private _velocityMagnitude = sqrt (_velocityX^2 + _velocityY^2);
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_velocityX = _velocityX + _simulationStep * (_velocityX * _velocityMagnitude * _airFriction);
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_velocityY = _velocityY + _simulationStep * (_velocityY * _velocityMagnitude * _airFriction - 9.81);
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_posX = _posX + _velocityX * _simulationStep;
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_posY = _posY + _velocityY * _simulationStep;
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if (_posX >= _posTargetX) exitWith {}; // bullet passed the target
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};
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_posY - _posTargetY
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};
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private _data = [_distance, _angleTarget, _maxElev, _initSpeed, _airFriction, _timeToLive, _simulationStep, _maxElev];
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if (_data call _fnc_traceBullet < 0) exitWith {_maxElev - _angleTarget};
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// Newton Method / Secand Method
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private _angle1 = _angleTarget;
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private _angle2 = _maxElev;
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private _it2 = 0;
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_data set [7, _maxElev];
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private _f1 = _data call _fnc_traceBullet;
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if (abs _f1 <= PRECISION) exitWith {0};
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while {abs _f1 > PRECISION} do {
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_data set [7, _angle2];
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private _f2 = _data call _fnc_traceBullet;
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_angle1 = _angle2;
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_angle2 = _angle2 - _f2 * (_angle2 - _angle1) / (_f2 - _f1);
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_f1 = _f2;
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_it2 = _it2 + 1;
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};
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_angle2 - _angleTarget
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