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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_CANVAS_ITEM_GUIDELINE_H
+#define SEEN_CANVAS_ITEM_GUIDELINE_H
+
+/**
+ * A class to represent a control guide line.
+ */
+
+/*
+ * Authors:
+ * Tavmjong Bah - Rewrite of SPGuideLine
+ * Rafael Siejakowski - Tweaks to handle appearance
+ *
+ * Copyright (C) 2020-2022 the Authors.
+ *
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glibmm/ustring.h>
+
+#include <2geom/point.h>
+#include <2geom/transforms.h>
+
+#include "canvas-item.h"
+#include "canvas-item-ctrl.h"
+
+namespace Inkscape {
+
+class CanvasItemGroup; // A canvas control that contains other canvas controls.
+class CanvasItemGuideHandle; // A handle ("dot") serving as draggable origin control
+
+class CanvasItemGuideLine : public CanvasItem {
+
+public:
+ CanvasItemGuideLine(CanvasItemGroup *group, Glib::ustring label,
+ Geom::Point const &origin, Geom::Point const &normal);
+ ~CanvasItemGuideLine() override;
+
+ // Geometry
+ void set_origin(Geom::Point const &origin);
+ void set_normal(Geom::Point const &normal);
+ bool is_horizontal() const { return (_normal.x() == 0.0); }
+ bool is_vertical() const { return (_normal.y() == 0.0); }
+ void update(Geom::Affine const &affine) override;
+ double closest_distance_to(Geom::Point const &p);
+
+ // Selection
+ bool contains(Geom::Point const &p, double tolerance = 0) override;
+
+ // Display
+ void render(Inkscape::CanvasItemBuffer *buf) override;
+
+ // Properties
+ void hide() override;
+ void show() override;
+ void set_stroke(guint32 color) final;
+ void set_label(Glib::ustring const & label);
+ void set_locked(bool locked);
+ void set_inverted(bool inverted);
+ void set_sensitive(bool sensitive) { _sensitive = sensitive; }
+
+ // Getters
+ CanvasItemGuideHandle* dot() const;
+
+protected:
+ Geom::Point _origin;
+ Geom::Point _normal = Geom::Point(0,1);
+ Glib::ustring _label;
+ bool _locked = true; // Flipped in constructor to trigger init of _origin_ctrl.
+ bool _inverted = false;
+ bool _sensitive = false;
+ std::unique_ptr<CanvasItemGuideHandle> _origin_ctrl;
+
+private:
+ inline static guint32 const CONTROL_LOCKED_COLOR = 0x00000080; // RGBA black semitranslucent
+ inline static double const LABEL_SEP = 2.0; // Distance between the label and the origin control
+};
+
+
+class CanvasItemGuideHandle : public CanvasItemCtrl {
+
+public:
+ CanvasItemGuideHandle(CanvasItemGroup *group, Geom::Point const &pos, CanvasItemGuideLine *line);
+ double radius() const;
+ void set_size_via_index(int index) final;
+
+private:
+ CanvasItemGuideLine *_my_line; // The guide line we belong to
+
+ // static data
+ inline static double const SCALE = 0.55; // handle size relative to an auto-smooth node
+ inline static unsigned const MINIMUM_SIZE = 7; // smallest handle size, must be an odd int
+};
+
+} // namespace Inkscape
+
+#endif // SEEN_CANVAS_ITEM_GUIDELINE_H
+
+/*
+ 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 :