ping_pong_balls_factory.cc
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	#include "ping_pong_balls_factory.hh"
	#include "compute_contact.hh"
	#include "compute_verlet_integration.hh"
	#include "csv_reader.hh"
	#include "csv_writer.hh"
	#include "ping_pong_ball.hh"
	#include <cmath>
	#include <iostream>
	/* -------------------------------------------------------------------------- */

	std::unique_ptr<Particle> PingPongBallsFactory::createParticle() {
	return std::make_unique<PingPongBall>();
	}

	/* -------------------------------------------------------------------------- */

	SystemEvolution&
	PingPongBallsFactory::createSimulation(const std::string& fname,
	Real timestep) {
	this->system_evolution =
	std::make_unique<SystemEvolution>(std::make_unique<System>());

	CsvReader reader(fname);
	reader.read(this->system_evolution->getSystem());

	auto contact = std::make_shared<ComputeContact>();
	auto verlet = std::make_shared<ComputeVerletIntegration>(timestep);

	contact->setPenalty(1.);
	verlet->addInteraction(contact);
	this->system_evolution->addCompute(verlet);

	return *system_evolution;
	}

	/* -------------------------------------------------------------------------- */

	ParticlesFactoryInterface& PingPongBallsFactory::getInstance() {
	if (not ParticlesFactoryInterface::factory)
	ParticlesFactoryInterface::factory = new PingPongBallsFactory;

	return *factory;
	}

	/* -------------------------------------------------------------------------- */