6 * $Date: 2012-07-02 20:59:27 +0200 (Mon, 02 Jul 2012) $
7 ***************************************************************/
10 * \brief Declaration of doubly linked lists and iterators
12 * \author Gereon Bartel
15 * This file is part of the Open Graph Drawing Framework (OGDF).
19 * See README.txt in the root directory of the OGDF installation for details.
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * Version 2 or 3 as published by the Free Software Foundation;
25 * see the file LICENSE.txt included in the packaging of this file
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
35 * You should have received a copy of the GNU General Public
36 * License along with this program; if not, write to the Free
37 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
38 * Boston, MA 02110-1301, USA.
40 * \see http://www.gnu.org/copyleft/gpl.html
41 ***************************************************************/
47 #ifndef OGDF_CONVEX_HULL_H
48 #define OGDF_CONVEX_HULL_H
50 #include <ogdf/basic/GraphAttributes.h>
51 #include <ogdf/basic/geometry.h>
52 #include <ogdf/internal/energybased/MultilevelGraph.h>
57 // all returned Polygons are clockwise (cw)
58 class OGDF_EXPORT ConvexHull
{
60 bool sameDirection(const DPoint
&start
, const DPoint
&end
, const DPoint
&s
, const DPoint
&e
) const;
62 // calculates a convex hull very quickly but only works with cross-free Polygons!
63 DPolygon
conv(const DPolygon
&poly
) const;
65 // Calculates the Part of the convex hull that is left of line start-end
66 // /a points should only contain points that really are left of the line.
67 void leftHull(std::vector
<DPoint
> points
, DPoint
&start
, DPoint
&end
, DPolygon
&hullPoly
) const;
74 DPoint
calcNormal(const DPoint
&start
, const DPoint
&end
) const;
75 double leftOfLine(const DPoint
&normal
, const DPoint
&point
, const DPoint
&pointOnLine
) const;
77 DPolygon
call(std::vector
<DPoint
> points
) const;
78 DPolygon
call(GraphAttributes
&GA
) const;
79 DPolygon
call(MultilevelGraph
&MLG
) const;