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Copy pathMovingTarget.cpp
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206 lines (193 loc) · 4.72 KB
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/*
* Copyright 2010-2014 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>
#include "../fmath.h"
namespace OpenXcom
{
/**
* Initializes a moving target with blank coordinates.
*/
MovingTarget::MovingTarget() : Target(), _dest(0), _speedLon(0.0), _speedLat(0.0), _speedRadian(0.0), _speed(0)
{
}
/**
* Make sure to cleanup the target's destination followers.
*/
MovingTarget::~MovingTarget()
{
if (_dest != 0 && !_dest->getFollowers()->empty())
{
for (std::vector<Target*>::iterator i = _dest->getFollowers()->begin(); i != _dest->getFollowers()->end(); ++i)
{
if ((*i) == this)
{
_dest->getFollowers()->erase(i);
break;
}
}
}
}
/**
* Loads the moving target from a YAML file.
* @param node YAML node.
*/
void MovingTarget::load(const YAML::Node &node)
{
Target::load(node);
_speedLon = node["speedLon"].as<double>(_speedLon);
_speedLat = node["speedLat"].as<double>(_speedLat);
_speedRadian = node["speedRadian"].as<double>(_speedRadian);
_speed = node["speed"].as<int>(_speed);
}
/**
* Saves the moving target to a YAML file.
* @return YAML node.
*/
YAML::Node MovingTarget::save() const
{
YAML::Node node = Target::save();
if (_dest != 0)
{
node["dest"] = _dest->saveId();
}
node["speedLon"] = _speedLon;
node["speedLat"] = _speedLat;
node["speedRadian"] = _speedRadian;
node["speed"] = _speed;
return node;
}
/**
* Returns the destination the moving target is heading to.
* @return Pointer to destination.
*/
Target *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);
}
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.
_speedRadian = _speed * (1 / 60.0) * (M_PI / 180) / 720.0;
calculateSpeed();
}
/**
* 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);
_speedLat = dLat / length * _speedRadian;
_speedLon = dLon / length * _speedRadian / cos(_lat + _speedLat);
// Check for invalid speeds when a division by zero occurs due to near-zero values
if (!(_speedLon == _speedLon) || !(_speedLat == _speedLat))
{
_speedLon = 0;
_speedLat = 0;
}
}
else
{
_speedLon = 0;
_speedLat = 0;
}
}
/**
* 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 ( AreSame(_dest->getLongitude(), _lon) && AreSame(_dest->getLatitude(), _lat) );
}
/**
* Executes a movement cycle for the moving target.
*/
void MovingTarget::move()
{
calculateSpeed();
if (_dest != 0)
{
if (getDistance(_dest) > _speedRadian)
{
setLongitude(_lon + _speedLon);
setLatitude(_lat + _speedLat);
}
else
{
setLongitude(_dest->getLongitude());
setLatitude(_dest->getLatitude());
}
}
}
}