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/** ---------------------------------------------------------------------------
* -*- c++ -*-
* @file: particlebody.cpp
*
* Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
* MIT License, see LICENSE file for more details.
* ----------------------------------------------------------------------------
*/
#include <yage/physics/particlebody.h>
#include <cmath>
#include <iostream>
namespace yage
{
ParticleBody::ParticleBody(const Vector2d &position, double mass,
const Vector2d &velocity, bool gravity)
: Body(position, mass, velocity, gravity)
{
}
void ParticleBody::applyForce(const Vector2d &force)
{
force_ += force;
}
void ParticleBody::update()
{
// set the time_step for 60fps
double time_step = 1.0 / 60.0;
// set the last acceleration
Vector2d last_acceleration = acceleration_;
// update the position of the body
position_ += velocity_ * time_step +
(0.5 * last_acceleration * std::pow(time_step, 2));
// update the acceleration
if (gravity_) {
acceleration_ =
Vector2d(force_.x() / mass_, (GRAVITY + force_.y()) / mass_);
} else {
acceleration_ = Vector2d(force_.x() / mass_, force_.y() / mass_);
}
Vector2d avg_acceleration = (acceleration_ + last_acceleration) / 2.0;
// update the velocity of the body
velocity_ += avg_acceleration * time_step;
}
} // namespace yage
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