ressor.cpp
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	#define _USE_SVECTOR_OSTREAM

	#include "ressor.h"
	#include <iostream>

	#include <QGLShaderProgram>

	#include "descriptors/ressort.h"
	#include "models/glsphere.h"

	#include "sktools.h"

	using namespace symkit;
	using namespace std;

	const Vector Ressor::p = {0};
	const Vector Ressor::p_prime = {10};

	const Vector Ressor::axys = {1, -0.5, 1};

	const double Ressor::l = 0.0;
	const double Ressor::m = 1.0;
	const double Ressor::k = 0.5;

	Ressor::Ressor(models::GLSphere * model)

	: OscillatorShape(NULL, model)
	{
	/* initialize descriptor */
	ressort = new Ressort(p, p_prime, axys, l, m, k);

	/* bind the descriptor */
	bind(ressort);

	toggleFillMode();
	}

	Ressor::~Ressor()
	{
	/* release descriptor */
	release();

	/* delete descriptor */
	delete ressort;
	}

	#include "assets.h" // colorGradientFunction

	/* set color */
	void Ressor::evolve(float)
	{
	setColor( alpha::colorGradientFunction(ressort->getp_prime().module(), 15.0) );
	}

	#include "skerror.h"

	using namespace symkit;

	void Ressor::initialize()
	{
	if (!isBound())
	throw SKError(ERR_INIT,
	"initialize",
	"alpha.Ressor"
	"Descriptor ins't bound");
	}

	/* draw/render function */
	void Ressor::render(render_s& args)
	{
	OscillatorShape::render(args);

	glBegin(GL_LINES);

	args.shaderProgram->setAttributeValue(AttributeId::vertex, ARRAY_3D_FLOAT_ARGS(SVector<3>::nullv)); // center
	args.shaderProgram->setAttributeValue(AttributeId::vertex, ARRAY_3D_FLOAT_ARGS( -position() ));

	glEnd();
	}