Adding upstream version 1.0.2.upstream/1.0.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 108 insertions, 0 deletions

diff --git a/src/object/sp-offset.h b/src/object/sp-offset.h
new file mode 100644
index 0000000..f5e9bf1
--- /dev/null
+++ b/src/object/sp-offset.h
@@ -0,0 +1,108 @@
+// 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"
+
+#define SP_OFFSET(obj) (dynamic_cast<SPOffset*>((SPObject*)obj))
+#define SP_IS_OFFSET(obj) (dynamic_cast<const SPOffset*>((SPObject*)obj) != NULL)
+
+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(SPAttributeEnum 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);
+
+#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 :