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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "titanic/star_control/flight_manager_base.h"
#include "titanic/star_control/fmatrix.h"
namespace Titanic {
CFlightManagerBase::CFlightManagerBase() : _srcPos(0.0, 1000000.0, 0.0) {
_active = false;
_distance = 0.0;
_flight = false;
_step = 0.0;
_step1 = 0;
_accCount = 0;
_traCount = 0;
_decCount = 0;
_totCount = 0;
_currentSpin = 0.0;
_spinStep = 0.0;
}
void CFlightManagerBase::clear() {
_srcPos.clear();
_destPos.clear();
_currentSpin = 1.0;
_distance = 0.0;
_active = false;
_flight = false;
}
void CFlightManagerBase::setPath(const FVector &from, const FVector &to) {
_srcPos = from;
_destPos = to;
_direction = _destPos - _srcPos;
// normalization won't happen if _direction is zero vector and that is okay
float temp = 0.0;
_direction.normalize(temp);
_distance = temp;
_active = false;
_flight = false;
_accCount = -1;
_traCount = -1;
_decCount = -1;
_totCount = -1;
_currentSpin = 1.0;
}
void CFlightManagerBase::buildMotionTable(int sustain, int decay, float distance) {
_step = distance / (sustain + 2 * decay);
_step1 = decay * _step;
_accCount = GAMMA_TABLE_SIZE - 1;
_traCount = sustain;
_decCount = GAMMA_TABLE_SIZE - 1;
_totCount = _accCount + _traCount + _decCount;
// Main calculation loop
double radix = 4.0;
double index = 0.0;
double step = 1.0 / (double)(GAMMA_TABLE_SIZE);
double total = 0.0;
for (int i = 0; i < GAMMA_TABLE_SIZE; ++i) {
_gammaTable[GAMMA_TABLE_SIZE - i - 1] = pow(index, radix);
index += step;
total += _gammaTable[GAMMA_TABLE_SIZE - i - 1];
}
// normalise them
for (int i = 0; i < GAMMA_TABLE_SIZE; ++i)
_gammaTable[i] = _step1 * _gammaTable[i] / total;
}
} // End of namespace Titanic
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