pendule.cpp
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	#include "pendule.h"

	#include "models/glsphere.h"

	#include "graphtools.h"

	using namespace symkit;

	#ifndef M_PI
	#define M_PI 3.141592654
	#endif

	const Vector Pendule::p = {M_PI / 2};
	const Vector Pendule::p_prime = {- M_PI / 4};

	const double Pendule::l = 5.0;
	const double Pendule::m = 1.0;

	Pendule::Pendule(models::GLSphere * model)

	: OscillatorParticle(NULL, model)
	{
	/* initialize descriptor */
	pendule = new PenduleS(p, p_prime, l, m);

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

	/* set fill mode to false (default true) */
	toggleFillMode();

	/* set evolving to true (default false) */
	toggleEvolving();
	}

	Pendule::~Pendule()
	{
	/* Release descriptor */
	release();

	delete pendule;
	}

	#include "skerror.h"

	using namespace symkit;

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

	#include "assets.h" // colorGradientFunction

	/* set color */
	void Pendule::evolve(float)
	{
	setColor( alpha::colorGradientFunction(pendule->getp_prime().module(), 3.0) );
	}

	#include <QGLShaderProgram>

	/* draw/render function */
	void Pendule::render(render_s args)
	{
	OscillatorParticle::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();
	}