circle.h

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/* === S Y N F I G ========================================================= */
/* ========================================================================= */

/* === H E A D E R S ======================================================= */

#ifndef __SYNFIG_LAYER_CIRCLE_H__
#define __SYNFIG_LAYER_CIRCLE_H__

/* -- H E A D E R S --------------------------------------------------------- */

#include <synfig/layers/layer_composite.h>
#include <synfig/color.h>
#include <synfig/vector.h>
#include <synfig/value.h>

using namespace synfig;
using namespace std;
using namespace etl;

/* -- M A C R O S ----------------------------------------------------------- */

/* -- T Y P E D E F S ------------------------------------------------------- */

/* -- S T R U C T S & C L A S S E S ----------------------------------------- */

class Circle : public synfig::Layer_Composite, public synfig::Layer_NoDeform
{
    SYNFIG_LAYER_MODULE_EXT
private:
    ValueBase param_color;
    ValueBase param_origin;
    ValueBase param_radius;
    ValueBase param_feather;
    ValueBase param_invert;
    ValueBase param_falloff;

    //Caching system for circle
    struct CircleDataCache
    {
        Real inner_radius;
        Real outer_radius;

        Real inner_radius_sqd;
        Real outer_radius_sqd;

        Real diff_sqd;
        Real double_feather;
    };

    typedef Real    FALLOFF_FUNC(const CircleDataCache &c, const Real &mag_sqd);

    FALLOFF_FUNC    *falloff_func;
    CircleDataCache cache;

    void constructcache();

    static  Real    SqdFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    InvSqdFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    SqrtFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    InvSqrtFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    LinearFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    InvLinearFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    SigmondFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    InvSigmondFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    CosineFalloff(const CircleDataCache &c, const Real &mag_sqd);
    static  Real    InvCosineFalloff(const CircleDataCache &c, const Real &mag_sqd);

    FALLOFF_FUNC    *GetFalloffFunc()const;
    bool ImportParameters(const String &param, const ValueBase &value);

public:
    enum Falloff
    {
        FALLOFF_SQUARED     =0,
        FALLOFF_INTERPOLATION_LINEAR        =1,
        FALLOFF_SMOOTH      =2,
        FALLOFF_COSINE      =2,
        FALLOFF_SIGMOND     =3,
        FALLOFF_SQRT        =4
    };

    Circle();

    virtual bool set_param(const String &param, const ValueBase &value);

    virtual ValueBase get_param(const String &param)const;

    virtual Color get_color(Context context, const Point &pos)const;

    virtual bool accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const;
    virtual bool accelerated_cairorender(Context context,cairo_t *cr,int quality, const RendDesc &renddesc, ProgressCallback *cb)const;

    virtual synfig::Rect get_full_bounding_rect(synfig::Context context)const;
    virtual synfig::Rect get_bounding_rect()const;

    synfig::Layer::Handle hit_check(synfig::Context context, const synfig::Point &point)const;

    virtual Vocab get_param_vocab()const;
    void compile_gradient(cairo_pattern_t* gradient, CircleDataCache cache, FALLOFF_FUNC *func)const;
};

/* -- E X T E R N S --------------------------------------------------------- */


/* -- E N D ----------------------------------------------------------------- */

#endif