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Copy pathMovingTarget.cpp
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199 lines (184 loc) · 4.72 KB
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/*
* Copyright 2010 OpenXcom Developers.
*
* This file is part of OpenXcom.
*
* OpenXcom 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.
*
* OpenXcom 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 OpenXcom. If not, see <http://www.gnu.org/licenses/>.
*/
#define _USE_MATH_DEFINES
#include "MovingTarget.h"
#include <cmath>
namespace OpenXcom
{
/**
* Initializes a moving target with blank coordinates.
*/
MovingTarget::MovingTarget() : Target(), _dest(0), _speedLon(0.0), _speedLat(0.0), _radianSpeed(0.0), _distCurrent(0.0), _distMax(0.0), _speed(0)
{
}
MovingTarget::~MovingTarget()
{
}
/**
* Loads the moving target from a YAML file.
* @param node YAML node.
*/
void MovingTarget::load(const YAML::Node &node)
{
Target::load(node);
node["speedLon"] >> _speedLon;
node["speedLat"] >> _speedLat;
node["speed"] >> _speed;
}
/**
* Saves the moving target to a YAML file.
* @param out YAML emitter.
*/
void MovingTarget::save(YAML::Emitter &out) const
{
Target::save(out);
if (_dest != 0)
{
out << YAML::Key << "dest" << YAML::Value;
_dest->saveId(out);
}
out << YAML::Key << "speedLon" << YAML::Value << _speedLon;
out << YAML::Key << "speedLat" << YAML::Value << _speedLat;
out << YAML::Key << "speed" << YAML::Value << _speed;
}
/**
* Returns the destination the moving target is heading to.
* @return Pointer to destination.
*/
Target *const MovingTarget::getDestination() const
{
return _dest;
}
/**
* Changes the destination the moving target is heading to.
* @param dest Pointer to destination.
*/
void MovingTarget::setDestination(Target *dest)
{
// Remove moving target from old destination's followers
if (_dest != 0)
{
for (std::vector<Target*>::iterator i = _dest->getFollowers()->begin(); i != _dest->getFollowers()->end(); ++i)
{
if ((*i) == this)
{
_dest->getFollowers()->erase(i);
break;
}
}
}
_dest = dest;
// Add moving target to new destination's followers
if (_dest != 0)
{
_dest->getFollowers()->push_back(this);
_distMax = getDistance(_dest);
_distCurrent = 0.0;
}
else
{
_distMax = _distCurrent = 0.0;
}
calculateSpeed();
}
/**
* Returns the speed of the moving target.
* @return Speed in knots.
*/
int MovingTarget::getSpeed() const
{
return _speed;
}
/**
* Changes the speed of the moving target
* and converts it from standard knots (nautical miles per hour)
* into radians per 5 in-game seconds.
* @param speed Speed in knots.
*/
void MovingTarget::setSpeed(int speed)
{
_speed = speed;
// Each nautical mile is 1/60th of a degree.
// Each hour contains 720 5-seconds.
_radianSpeed = _speed * (1 / 60.0) * (M_PI / 180) / 720.0;
calculateSpeed();
}
/**
* Returns the great circle distance to another
* target on the globe.
* @param target Pointer to other target.
* @returns Distance in radian.
*/
double MovingTarget::getDistance(Target *target) const
{
return acos(cos(_lat) * cos(target->getLatitude()) * cos(target->getLongitude() - _lon) + sin(_lat) * sin(target->getLatitude()));
}
/**
* Calculates the speed vector based on the
* great circle distance to destination and
* current raw speed.
*/
void MovingTarget::calculateSpeed()
{
if (_dest != 0)
{
double dLon, dLat, length;
dLon = sin(_dest->getLongitude() - _lon) * cos(_dest->getLatitude());
dLat = cos(_lat) * sin(_dest->getLatitude()) - sin(_lat) * cos(_dest->getLatitude()) * cos(_dest->getLongitude() - _lon);
length = sqrt(dLon * dLon + dLat * dLat);
_speedLon = dLon / length * _radianSpeed / cos(_lat + _speedLat);
_speedLat = dLat / length * _radianSpeed;
}
else
{
_speedLon = 0;
_speedLat = 0;
}
}
/**
* Checks if the moving target has finished its route by checking
* if it has exceeded the destination position based on the speed vector.
* @return True if it has, False otherwise.
*/
bool MovingTarget::finishedRoute() const
{
return (_distCurrent >= _distMax);
}
/**
* Checks if the moving target has reached its destination.
* @return True if it has, False otherwise.
*/
bool MovingTarget::reachedDestination() const
{
if (_dest == 0)
{
return false;
}
return (_lon == _dest->getLongitude() && _lat == _dest->getLatitude());
}
/**
* Executes a movement cycle for the moving target.
*/
void MovingTarget::move()
{
setLongitude(_lon + _speedLon);
setLatitude(_lat + _speedLat);
_distCurrent += _radianSpeed;
}
}