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diff --git a/src/object/box3d.h b/src/object/box3d.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SP_BOX3D_H
+#define SEEN_SP_BOX3D_H
+
+/*
+ * SVG <box3d> implementation
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * Maximilian Albert <Anhalter42@gmx.de>
+ * Abhishek Sharma
+ * Jon A. Cruz <jon@joncruz.org.
+ *
+ * Copyright (C) 2007 Authors
+ * 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-item-group.h"
+#include "proj_pt.h"
+#include "axis-manip.h"
+
+#define SP_TYPE_BOX3D (box3d_get_type ())
+
+class Persp3D;
+class Persp3DReference;
+
+class SPBox3D : public SPGroup {
+public:
+ SPBox3D();
+ ~SPBox3D() override;
+
+ int z_orders[6]; // z_orders[i] holds the ID of the face at position #i in the group (from top to bottom)
+
+ char *persp_href;
+ Persp3DReference *persp_ref;
+
+ Proj::Pt3 orig_corner0;
+ Proj::Pt3 orig_corner7;
+
+ Proj::Pt3 save_corner0;
+ Proj::Pt3 save_corner7;
+
+ Box3D::Axis swapped; // to indicate which coordinates are swapped during dragging
+
+ int my_counter; // for debugging only
+
+ /**
+ * Create a SPBox3D and append it to the parent.
+ */
+ static SPBox3D * createBox3D(SPItem * parent);
+
+ void build(SPDocument *document, Inkscape::XML::Node *repr) override;
+ void release() 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 int flags) override;
+
+ virtual const char* display_name();
+ Geom::Affine set_transform(Geom::Affine const &transform) override;
+ void convert_to_guides() const override;
+ const char* displayName() const override;
+ char *description() const override;
+
+ void position_set ();
+ Geom::Point get_corner_screen (unsigned int id, bool item_coords = true) const;
+ Proj::Pt3 get_proj_center ();
+ Geom::Point get_center_screen ();
+
+ void set_corner (unsigned int id, Geom::Point const &new_pos, Box3D::Axis movement, bool constrained);
+ void set_center (Geom::Point const &new_pos, Geom::Point const &old_pos, Box3D::Axis movement, bool constrained);
+ void corners_for_PLs (Proj::Axis axis, Geom::Point &corner1, Geom::Point &corner2, Geom::Point &corner3, Geom::Point &corner4) const;
+ bool recompute_z_orders ();
+ void set_z_orders ();
+
+ int pt_lies_in_PL_sector (Geom::Point const &pt, int id1, int id2, Box3D::Axis axis) const;
+ int VP_lies_in_PL_sector (Proj::Axis vpdir, int id1, int id2, Box3D::Axis axis) const;
+
+ void relabel_corners();
+ void check_for_swapped_coords();
+
+ static std::list<SPBox3D *> extract_boxes(SPObject *obj);
+
+ Persp3D *get_perspective() const;
+ void switch_perspectives(Persp3D *old_persp, Persp3D *new_persp, bool recompute_corners = false);
+
+ SPGroup *convert_to_group();
+};
+
+
+#endif // SEEN_SP_BOX3D_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:fileencoding=utf-8:textwidth=99 :