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#include "Physics/particlebody.hpp"
#include <cmath>
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_.x+=velocity_.x*time_step+(0.5*last_acceleration.x*std::pow(time_step, 2));
//position_.y+=velocity_.y*time_step+(0.5*last_acceleration.y*std::pow(time_step, 2));
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;
}
} // yage
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