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diff --git a/kig/objects/polygon_imp.h b/kig/objects/polygon_imp.h
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+// Copyright (C)  2004  Pino Toscano <toscano.pino@tiscali.it>
+
+// 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, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+// 02110-1301, USA.
+
+#ifndef KIG_OBJECTS_POLYGON_IMP_H
+#define KIG_OBJECTS_POLYGON_IMP_H
+
+#include "object_imp.h"
+#include "../misc/coordinate.h"
+#include <vector>
+
+/**
+ * An ObjectImp representing a polygon.
+ */
+class PolygonImp
+  : public ObjectImp
+{
+  uint mnpoints;
+  std::vector<Coordinate> mpoints;
+  Coordinate mcenterofmass;
+public:
+  typedef ObjectImp Parent;
+  /**
+   * Returns the ObjectImpType representing the PolygonImp type..
+   */
+  static const ObjectImpType* stype();
+  static const ObjectImpType* stype3();
+  static const ObjectImpType* stype4();
+
+  /**
+   * Constructs a polygon.
+   */
+  PolygonImp( const std::vector<Coordinate>& points );
+  PolygonImp( const uint nsides, const std::vector<Coordinate>& points, 
+              const Coordinate& centerofmass );
+  ~PolygonImp();
+  PolygonImp* copy() const;
+
+  Coordinate attachPoint() const;
+  ObjectImp* transform( const Transformation& ) const;
+
+  void draw( KigPainter& p ) const;
+  bool contains( const Coordinate& p, int width, const KigWidget& ) const;
+  bool inRect( const Rect& r, int width, const KigWidget& ) const;
+  bool valid() const;
+  Rect surroundingRect() const;
+
+  const uint numberOfProperties() const;
+  const QCStringList properties() const;
+  const QCStringList propertiesInternalNames() const;
+  ObjectImp* property( uint which, const KigDocument& w ) const;
+  const char* iconForProperty( uint which ) const;
+  const ObjectImpType* impRequirementForProperty( uint which ) const;
+  bool isPropertyDefinedOnOrThroughThisImp( uint which ) const;
+
+  const ObjectImpType* type() const;
+  void visit( ObjectImpVisitor* vtor ) const;
+
+  /**
+   * Returns the vector with polygon points.
+   */
+  const std::vector<Coordinate> points() const; 
+  /**
+   * Returns the center of mass of the polygon.
+   */
+  const Coordinate centerOfMass() const; 
+  /**
+   * Returns the number of points of this polygon.
+   */
+  const uint npoints() const;
+
+  bool equals( const ObjectImp& rhs ) const;
+  bool isInPolygon( const Coordinate& p ) const;
+  int windingNumber() const;
+  bool isMonotoneSteering() const;
+  bool isConvex() const;
+};
+
+std::vector<Coordinate> computeConvexHull( const std::vector<Coordinate>& points );
+
+#endif