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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_SP_SPIRAL_H
#define SEEN_SP_SPIRAL_H
/*
* Authors:
* Mitsuru Oka <oka326@parkcity.ne.jp>
* Lauris Kaplinski <lauris@kaplinski.com>
*
* Copyright (C) 1999-2002 Lauris Kaplinski
* Copyright (C) 2000-2001 Ximian, Inc.
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "sp-shape.h"
#define noSPIRAL_VERBOSE
#define SP_EPSILON 1e-5
#define SP_EPSILON_2 (SP_EPSILON * SP_EPSILON)
#define SP_HUGE 1e5
#define SPIRAL_TOLERANCE 3.0
#define SAMPLE_STEP (1.0/4.0) ///< step per 2PI
#define SAMPLE_SIZE 8 ///< sample size per one bezier
/**
* A spiral Shape.
*
* The Spiral shape is defined as:
* \verbatim
x(t) = rad * t^exp cos(2 * Pi * revo*t + arg) + cx
y(t) = rad * t^exp sin(2 * Pi * revo*t + arg) + cy \endverbatim
* where spiral curve is drawn for {t | t0 <= t <= 1}. The rad and arg
* parameters can also be represented by transformation.
*
* \todo Should I remove these attributes?
*/
class SPSpiral : public SPShape {
public:
SPSpiral();
~SPSpiral() override;
float cx, cy;
float exp; ///< Spiral expansion factor
float revo; ///< Spiral revolution factor
float rad; ///< Spiral radius
float arg; ///< Spiral argument
float t0;
/* Lowlevel interface */
void setPosition(double cx, double cy, double exp, double revo, double rad, double arg, double t0);
Geom::Affine set_transform(Geom::Affine const& xform) override;
Geom::Point getXY(double t) const;
void getPolar(double t, double* rad, double* arg) const;
bool isInvalid() const;
void build(SPDocument* doc, Inkscape::XML::Node* repr) override;
Inkscape::XML::Node* write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, unsigned int flags) override;
void update(SPCtx *ctx, unsigned int flags) override;
void set(SPAttr key, char const* value) override;
void snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const override;
const char* typeName() const override;
const char* displayName() const override;
char* description() const override;
void update_patheffect(bool write) override;
void set_shape() override;
private:
Geom::Point getTangent(double t) const;
void fitAndDraw(SPCurve* c, double dstep, Geom::Point darray[], Geom::Point const& hat1, Geom::Point& hat2, double* t) const;
};
MAKE_SP_OBJECT_DOWNCAST_FUNCTIONS(SP_SPIRAL, SPSpiral)
MAKE_SP_OBJECT_TYPECHECK_FUNCTIONS(SP_IS_SPIRAL, SPSpiral)
#endif // SEEN_SP_SPIRAL_H
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