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Diffstat (limited to 'src/object/sp-offset.h')
| -rw-r--r-- | src/object/sp-offset.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/object/sp-offset.h b/src/object/sp-offset.h new file mode 100644 index 0000000..a85837e --- /dev/null +++ b/src/object/sp-offset.h @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#ifndef SEEN_SP_OFFSET_H +#define SEEN_SP_OFFSET_H +/* + * Authors: + * Mitsuru Oka <oka326@parkcity.ne.jp> + * Lauris Kaplinski <lauris@kaplinski.com> + * (of the sp-spiral.h upon which this file was created) + * 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 <cstddef> +#include <sigc++/sigc++.h> + +#include "sp-shape.h" + +class SPUseReference; + +/** + * SPOffset class. + * + * An offset is defined by curve and radius. The original curve is kept as + * a path in a sodipodi:original attribute. It's not possible to change + * the original curve. + * + * SPOffset is a derivative of SPShape, much like the SPSpiral or SPRect. + * The goal is to have a source shape (= originalPath), an offset (= radius) + * and compute the offset of the source by the radius. To get it to work, + * one needs to know what the source is and what the radius is, and how it's + * stored in the xml representation. The object itself is a "path" element, + * to get lots of shape functionality for free. The source is the easy part: + * it's stored in a "inkscape:original" attribute in the path. In case of + * "linked" offset, as they've been dubbed, there is an additional + * "inkscape:href" that contains the id of an element of the svg. + * When built, the object will attach a listener vector to that object and + * rebuild the "inkscape:original" whenever the href'd object changes. This + * is of course grossly inefficient, and also does not react to changes + * to the href'd during context stuff (like changing the shape of a star by + * dragging control points) unless the path of that object is changed during + * the context (seems to be the case for SPEllipse). The computation of the + * offset is done in sp_offset_set_shape(), a function that is called whenever + * a change occurs to the offset (change of source or change of radius). + * just like the sp-star and other, this path derivative can make control + * points, or more precisely one control point, that's enough to define the + * radius (look in shape-editor-knotholders). + */ +class SPOffset : public SPShape { +public: + SPOffset(); + ~SPOffset() override; + + void *originalPath; ///< will be a livarot Path, just don't declare it here to please the gcc linker FIXME what? + char *original; ///< SVG description of the source path + float rad; ///< offset radius + + /// for interactive setting of the radius + bool knotSet; + Geom::Point knot; + + bool sourceDirty; + bool isUpdating; + + char *sourceHref; + SPUseReference *sourceRef; + Inkscape::XML::Node *sourceRepr; ///< the repr associated with that id + SPObject *sourceObject; + + sigc::connection _modified_connection; + sigc::connection _delete_connection; + sigc::connection _changed_connection; + sigc::connection _transformed_connection; + + void build(SPDocument *document, Inkscape::XML::Node *repr) override; + void set(SPAttr key, char const* value) override; + void update(SPCtx *ctx, unsigned int flags) override; + Inkscape::XML::Node* write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, unsigned flags) override; + void release() override; + + void snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const override; + const char* displayName() const override; + char* description() const override; + + void set_shape() override; +}; + +double sp_offset_distance_to_original (SPOffset * offset, Geom::Point px); +void sp_offset_top_point (SPOffset const *offset, Geom::Point *px); + +SPItem *sp_offset_get_source (SPOffset *offset); + +MAKE_SP_OBJECT_DOWNCAST_FUNCTIONS(SP_OFFSET, SPOffset) + +#endif + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 : |