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#ifndef STROKE_DEFORMATION_H
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#define STROKE_DEFORMATION_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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#include "tcommon.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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#include "tgeometry.h"
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//#include "ext/TriParam.h"
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#include "ext/Types.h"
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#include "ext/ContextStatus.h"
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#include <vector></vector>
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// forward declarations
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class TStroke;
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#if defined(_WIN32) && (_MSC_VER <= 1200)
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// to avoid annoying warning
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#pragma warning(push)
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#pragma warning(disable : 4251)
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#endif
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namespace ToonzExt
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{
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class Designer;
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class Potential;
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class StrokeParametricDeformer;
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class StrokeDeformationImpl;
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//===========================================================================
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/**
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   * @brief This class is the interface for manipulation 
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   *        algorihms.
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   *
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   * StrokeDeformation is a wrapper for for StrokeDeformationImpl,
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   * its function is to verify state and parameteres before 
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   * to call the implementation methods of deformation.
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   * 
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   * There is an internal status to verify that actions:
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   * @arg @c CREATED on constructor
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   * @arg @c ACTIVE on active 
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   * @arg @c UPDATING on updating
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   * @arg @c DEACTIVE on deactive
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   *
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   * If some error of state occurs @c reset method is called.
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   * ContextStatus contains information about deformation parameter,
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   * and it occurs to reduce the number of parameters required.
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   */
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class DVAPI
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	StrokeDeformation
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{
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private:
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	StrokeDeformationImpl *
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		deformationImpl_;
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	/**
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     * @brief Internal status.
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     */
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	enum StrokeDeformationState {
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		CREATED,
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		ACTIVE,
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		UPDATING,
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		DEACTIVE,
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		RESETTED
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	};
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	StrokeDeformationState
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		state_;
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	/**
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     * @brief Recover from an invalid state
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     */
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	void
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	recover();
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	/**
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     * @brief Retrieve the current deformator.
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     */
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	StrokeDeformationImpl *
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	retrieveDeformator(const ContextStatus *status);
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public:
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	StrokeDeformation();
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	~StrokeDeformation();
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	/**
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     * @brief Init deformation and add control points.
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     */
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	void
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	activate(const ContextStatus *);
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	/**
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     * @brief Modify stroke.
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     */
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	void
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	update(const TPointD &delta);
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	/**
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     * @brief Return a stroke deformed.
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     * @return A stroke deformed.
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     */
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	TStroke *
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	deactivate();
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	/**
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     * @brief Clear inner status of Deformation.
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     */
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	void
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	reset();
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	/**
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     * @brief Just select correct Deformation.
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     */
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	void
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	check(const ContextStatus *);
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	/**
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     * @brief Apply a designer on current deformation.
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     */
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	void
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	draw(Designer *);
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	/**
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     * @brief Retrieve valid extremes for current manipulator/deformator.
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     */
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	ToonzExt::Interval
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	getExtremes() const;
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	/**
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     * @brief Return the stroke selected from user.
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     */
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	const TStroke *
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	getStroke() const;
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	/**
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     * @brief Return the stroke selected from user.
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     */
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	const TStroke *
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	getCopiedStroke() const;
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	/**
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     * @brief Return a reference to the stroke created to be manipulated.
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     * @note This stroke is different from stroke selected by user.
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     * @sa getStroke
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     */
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	const TStroke *
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	getTransformedStroke() const;
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	/**
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     * @brief Return the internal status of current deformation.
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     * @sa ContextStatus
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     */
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	const ContextStatus *
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	getStatus() const;
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	/**
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     * @brief Retrieve cursor associated to current deformator.
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     */
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	int
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	getCursorId() const;
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#ifdef _DEBUG
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	/**
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     * @brief Return the potential used in implementation.
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     * @note This is useful just for debug, please do not use directly.
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     * @sa Potential
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     */
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	const Potential *
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	getPotential() const;
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	/**
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     * @brief Return the potential used in implementation.
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     * @note This is useful just for debug, please do not use directly.
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     * @sa Potential
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     */
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	const StrokeDeformationImpl *
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	getDeformationImpl() const;
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#endif
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};
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}
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#if defined(_WIN32) && (_MSC_VER <= 1200)
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#pragma warning(pop)
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#endif
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#endif /* STROKE_DEFORMATION_H */
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//-----------------------------------------------------------------------------
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//  End Of File
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//-----------------------------------------------------------------------------