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diff --git a/include/2geom/geom.h b/include/2geom/geom.h
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+/**
+ *  \file
+ *  \brief Various geometrical calculations
+ *
+ *  Authors:
+ *   Nathan Hurst <njh@mail.csse.monash.edu.au>
+ *
+ * Copyright (C) 1999-2002 authors
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ */
+#ifndef LIB2GEOM_SEEN_GEOM_H
+#define LIB2GEOM_SEEN_GEOM_H
+
+//TODO: move somewhere else
+
+#include <vector>
+#include <2geom/forward.h>
+#include <optional>
+#include <2geom/bezier-curve.h>
+#include <2geom/line.h>
+
+namespace Geom {
+
+std::optional<Geom::LineSegment>
+rect_line_intersect(Geom::Rect &r,
+                    Geom::LineSegment ls);
+
+int centroid(std::vector<Geom::Point> const &p, Geom::Point& centroid, double &area);
+
+}
+
+#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 :