ACE3/addons/frag/functions/fnc_doSpall.sqf

#include "script_component.hpp"
/*
 * Author: ACE-Team
 * Dev things
 *
 * Arguments:
 * None
 *
 * Return Value:
 * None
 *
 * Example:
 * call ace_frag_fnc_doSpall
 *
 * Public: No
 */

#define WEIGHTED_SIZE [QGVAR(spall_small), 4, QGVAR(spall_medium), 3, QGVAR(spall_large), 2, QGVAR(spall_huge), 1]

params ["_hitData", "_hitPartDataIndex"];
private _initialData = GVAR(spallHPData) select (_hitData select 0);
_initialData params ["_hpId", "_object", "_roundType", "_round", "_curPos", "_velocity"];

private _hpData = (_hitData select 1) select _hitPartDataIndex;
private _objectHit = _hpData param [0, objNull];
TRACE_1("",_objectHit);
if ((isNil "_objectHit") || {isNull _objectHit}) exitWith {WARNING_1("Problem with hitPart data - bad object [%1]",_objectHit);};
_objectHit removeEventHandler ["hitPart", _hpId];

private _caliber = getNumber (configFile >> "CfgAmmo" >> _roundType >> "caliber");
private _explosive = getNumber (configFile >> "CfgAmmo" >> _roundType >> "explosive");
private _idh = getNumber (configFile >> "CfgAmmo" >> _roundType >> "indirectHitRange");

if !(_caliber >= 2.5 || {(_explosive > 0 && {_idh >= 1})}) exitWith {};
// ACE_player sideChat format ["BBBB"];
private _exit = false;
private _vm = 1;

private _oldVelocity = vectorMagnitude _velocity;
private _curVelocity = vectorMagnitude (velocity _round);

if (alive _round) then {
    private _diff = _velocity vectorDiff (velocity _round);
    private _polar = _diff call CBA_fnc_vect2polar;
    // ACE_player sideChat format ["polar: %1", _polar];
    if (abs (_polar select 1) > 45 || {abs (_polar select 2) > 45}) then {
        if (_caliber < 2.5) then {
            // ACE_player sideChat format ["exit!"];
            _exit = true;
        } else {
            SUB(_vm,_curVelocity / _oldVelocity);
        };
    };
};
if (_exit) exitWith {};

private _unitDir = vectorNormalized _velocity;
private _pos = _hpData select 3;
private _spallPos = [];
if ((isNil "_pos") || {!(_pos isEqualTypeArray [0,0,0])}) exitWith {WARNING_1("Problem with hitPart data - bad pos [%1]",_pos);};
for "_i" from 0 to 100 do {
    private _pos1 = _pos vectorAdd (_unitDir vectorMultiply (0.01 * _i));
    private _pos2 = _pos vectorAdd (_unitDir vectorMultiply (0.01 * (_i + 1)));
    // _data = [nil, nil, nil, 1, [[ASLtoATL _pos1, 1], [ASLtoATL _pos2, 1]]];
    // NOU_TRACES pushBack _data;

    if (!lineIntersects [_pos1, _pos2]) exitWith {
        // ACE_player sideChat format ["FOUND!"];
        _spallPos = _pos2;
    };
};
if (_spallPos isEqualTo []) exitWith {};
private _spallPolar = _velocity call CBA_fnc_vect2polar;

if (_explosive > 0) then {
    // ACE_player sideChat format ["EXPLOSIVE!"];
    private _warn = false;
    private _c = getNumber (configFile >> "CfgAmmo" >> _roundType >> QGVAR(CHARGE));
    if (_c == 0) then {_c = 1; _warn = true;};
    private _m = getNumber (configFile >> "CfgAmmo" >> _roundType >> QGVAR(METAL));
    if (_m == 0) then {_m = 2; _warn = true;};
    private _k = getNumber (configFile >> "CfgAmmo" >> _roundType >> QGVAR(GURNEY_K));
    if (_k == 0) then {_k = 1 / 2; _warn = true;};
    private _gC = getNumber (configFile >> "CfgAmmo" >> _roundType >> QGVAR(GURNEY_C));
    if (_gC == 0) then {_gC = 2440; _warn = true;};

    // if (_warn) then {
        // WARNING_1("Ammo class %1 lacks proper explosive properties definitions for frag!",_roundType); //TODO: turn this off when we get closer to release
    // };

    private _fragPower = (((_m / _c) + _k) ^ - (1 / 2)) * _gC;
    _spallPolar set [0, _fragPower * 0.66];
};

// diag_log text format ["SPALL POWER: %1", _spallPolar select 0];
private _spread = 15 + (random 25);
private _spallCount = 5 + (random 10);
TRACE_1("",_spallCount);
for "_i" from 1 to _spallCount do {
    private _elev = ((_spallPolar select 2) - _spread) + (random (_spread * 2));
    private _dir = ((_spallPolar select 1) - _spread) + (random (_spread * 2));
    if (abs _elev > 90) then {
        ADD(_dir,180);
    };
    _dir = _dir % 360;
    private _vel = (_spallPolar select 0) * 0.33 * _vm;
    _vel = (_vel - (_vel * 0.25)) + (random (_vel * 0.5));

    private _spallFragVect = [_vel, _dir, _elev] call CBA_fnc_polar2vect;
    private _fragment = (selectRandomWeighted WEIGHTED_SIZE) createVehicleLocal [0,0,10000];
    _fragment setPosASL _spallPos;
    _fragment setVelocity _spallFragVect;

    #ifdef DRAW_FRAG_INFO
        [ACE_player, _fragment, [1, 0.5, 0, 1]] call FUNC(dev_addTrack);
    #endif
};

_spread = 5 + (random 5);
_spallCount = 3 + (random 5);
for "_i" from 1 to _spallCount do {
    private _elev = ((_spallPolar select 2) - _spread) + (random (_spread * 2));
    private _dir = ((_spallPolar select 1) - _spread) + (random (_spread * 2));
    if (abs _elev > 90) then {
        ADD(_dir,180);
    };
    _dir = _dir % 360;
    private _vel = (_spallPolar select 0) * 0.55 * _vm;
    _vel = (_vel - (_vel * 0.25)) + (random (_vel * 0.5));

    private _spallFragVect = [_vel, _dir, _elev] call CBA_fnc_polar2vect;
    private _fragment = (selectRandomWeighted WEIGHTED_SIZE) createVehicleLocal [0, 0, 10000];
    _fragment setPosASL _spallPos;
    _fragment setVelocity _spallFragVect;

    #ifdef DRAW_FRAG_INFO
        [ACE_player, _fragment, [1, 0, 0, 1]] call FUNC(dev_addTrack);
    #endif
};