pendcouple.h
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	#ifndef PENDCOUPLE_H
	#define PENDCOUPLE_H

	#include "actors/symsystem.h"
	#include "vector.h"

	class PendSphere;
	class PenduleDesc;

	class GLModel;

	class PenduleCouple : public SymSystem
	{
	// system descriptor
	PenduleDesc * descriptor;

	// array of 2 spheres
	PendSphere * sphere[2];

	public:

	PenduleCouple(GLModel *);
	~PenduleCouple();

	double energy() const;

	virtual void evolve(float dt) override;

	virtual void render(symkit::render_s &) override;

	// constants
	static const Vector pos, speed;
	static const double l1, l2, m1, m2, g;
	};

	#endif // PENDCOUPLE_H