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diff --git a/polygon/polygons_defs.h b/polygon/polygons_defs.h
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2012-2014 Jean-Pierre Charras, jp.charras at wanadoo.fr
+ * Copyright (C) 2012-2014 KiCad Developers, see CHANGELOG.TXT for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/*
+ * file polygons_defs.h
+ * definitions to use boost::polygon in KiCad.
+ */
+
+#ifndef _POLYGONS_DEFS_H_
+#define _POLYGONS_DEFS_H_
+
+#include <boost/polygon/polygon.hpp>
+
+// Define some types used here from boost::polygon
+namespace bpl = boost::polygon;         // bpl = boost polygon library
+using namespace bpl::operators;         // +, -, =, ...
+
+// Definitions needed by boost::polygon
+typedef int                    coordinate_type;
+
+/**
+ * KI_POLYGON defines a single polygon ( boost::polygon_data type.
+ * When holes are created in a KPolygon, they are
+ * linked to main outline by overlapping segments,
+ * so there is always one polygon and one list of corners
+ * coordinates are int
+ */
+typedef bpl::polygon_data<int> KI_POLYGON;
+
+/**
+ * KI_POLYGON_SET defines a set of single KI_POLYGON.
+ * A KI_POLYGON_SET is used to store a set of polygons
+ * when performing operations between 2 polygons
+ * or 2 sets of polygons
+ * The result of operations like and, xor... between 2 polygons
+ * is always stored in a KI_POLYGON_SET, because these operations
+ * can create many polygons
+ */
+typedef std::vector<KI_POLYGON>  KI_POLYGON_SET;
+
+/**
+ * KI_POLY_POINT defines a point for boost::polygon.
+ * KI_POLY_POINT store x and y coordinates (int)
+ */
+typedef bpl::point_data<int>   KI_POLY_POINT;
+
+/**
+ * KI_POLYGON_WITH_HOLES defines a single polygon with holes
+ * When holes are created in a KI_POLYGON_WITH_HOLES, they are
+ * stored as separate single polygons,
+ * KI_POLYGON_WITH_HOLES store always one polygon for the external outline
+ * and one list of polygons (holes) which can be empty
+ */
+typedef bpl::polygon_with_holes_data<int> KI_POLYGON_WITH_HOLES;
+
+/**
+ * KI_POLYGON_WITH_HOLES_SET defines a set of KI_POLYGON_WITH_HOLES.
+ * A KI_POLYGON_WITH_HOLES_SET is used to store a set of polygons with holes
+ * when performing operations between 2 polygons
+ * or 2 sets of polygons with holes
+ * The result of operations like and, xor... between 2 polygons with holes
+ * is always stored in a KI_POLYGON_WITH_HOLES_SET, because these operations
+ * can create many separate polygons with holespolygons
+ */
+typedef std::vector<KI_POLYGON_WITH_HOLES>  KI_POLYGON_WITH_HOLES_SET;
+
+
+#endif          // #ifndef _POLYGONS_DEFS_H_