From cca66b9ec4e494c1d919bff0f71a820d8afab1fa Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:24:48 +0200 Subject: Adding upstream version 1.2.2. Signed-off-by: Daniel Baumann --- src/object/sp-spiral.h | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 src/object/sp-spiral.h (limited to 'src/object/sp-spiral.h') diff --git a/src/object/sp-spiral.h b/src/object/sp-spiral.h new file mode 100644 index 0000000..b632c39 --- /dev/null +++ b/src/object/sp-spiral.h @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#ifndef SEEN_SP_SPIRAL_H +#define SEEN_SP_SPIRAL_H +/* + * Authors: + * Mitsuru Oka + * Lauris Kaplinski + * + * 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 &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 -- cgit v1.2.3