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#ifndef NOT_SIMMETRIC_EXP_POTENTIAL_H
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#define NOT_SIMMETRIC_EXP_POTENTIAL_H
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/**
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 * @author  Fabrizio Morciano <fabrizio.morciano@gmail.com></fabrizio.morciano@gmail.com>
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 */
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/**
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 * @brief This class is to use a not symmetric exponential potential.
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 * 
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 *  @code
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 *          __|_
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 *        /   | |  
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 *    __/     |  \___
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 *
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 *                                         2
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 *                    {   -[(x  - t) / d1]
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 *                    {  e [             ]   for x < 0
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 *                    {
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 *      potential(x)= {
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 *                    {                     2
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 *                    {   -[(x  - t) / d2] 
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 *                    {  e [             ] for x >= 0
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 *                     
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 * con d   min( length_at_param, action_length *0.5)
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 *      1 
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 * ed  d   min( curve_lenght - length_at_param, action_length *0.5)
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 *      2
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 *  @endcode
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 */
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#include "tcommon.h"
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#include "tstroke.h"
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#include "ext/Potential.h"
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#undef DVAPI
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#undef DVVAR
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#ifdef TNZEXT_EXPORTS
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#define DVAPI DV_EXPORT_API
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#define DVVAR DV_EXPORT_VAR
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#else
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#define DVAPI DV_IMPORT_API
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#define DVVAR DV_IMPORT_VAR
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#endif
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namespace ToonzExt
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{
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class DVAPI
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	NotSimmetricExpPotential
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	: public Potential
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{
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public:
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	virtual ~NotSimmetricExpPotential();
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	// chiama compute_value ma effettua un controllo del parametro
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	virtual double
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	value_(double radiusToTest) const;
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	virtual void
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	setParameters_(const TStroke *ref,
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				   double par,
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				   double al);
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	Potential *
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	clone();
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private:
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	double compute_shape(double) const; // funzione ausiliaria per
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	// il calcolo del parametro
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	// da usare
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	double compute_value(double) const; // funzione ausiliaria per
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	// il calcolo del potenziale senza
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	// controllo del parametro
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	const TStroke *ref_;
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	double range_; // range of mapping
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	double par_;
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	double actionLength_;  // lunghezza dell'azione
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	double strokeLength_;  // lunghezza stroke
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	double lenghtAtParam_; // lunghezza nel pto di movimento
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	double leftFactor_;	// fattore di shape x la curva a sinistra
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	double rightFactor_;   // fattore di shape x la curva a dx
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};
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}
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#endif /* NOT_SIMMETRIC_EXP_POTENTIAL_H */
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//-----------------------------------------------------------------------------
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//  End Of File
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//-----------------------------------------------------------------------------