spring_force.h

#ifndef SPRING_FORCE_H
#define SPRING_FORCE_H

#include <vector3G.h>
#include <memory>
#include <Eigen/Core>
#include <physics_entity.h>
#include <spring.h>

class SpringForceGenerator
{
    public : 
        SpringForceGenerator();

        void AccumulateForce(
            const GLfloat k,
            const GLfloat l0,
            const std::shared_ptr<PhysicsEntity> entity1_ptr,
            const std::shared_ptr<PhysicsEntity> entity2_ptr,
            Vector3Gf &F) const;

        void AccumulatedFdx(
            const GLfloat k,
            const GLfloat l0,
            const std::shared_ptr<PhysicsEntity> entity1_ptr,
            const std::shared_ptr<PhysicsEntity> entity2_ptr,
            Eigen::Matrix<GLfloat,3,3> &dF) const;



};

#endif