1 files changed, 109 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-guideline.h b/src/display/control/canvas-item-guideline.h
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+++ b/src/display/control/canvas-item-guideline.h
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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 :