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diff --git a/kig/objects/line_imp.h b/kig/objects/line_imp.h
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+// Copyright (C)  2002  Dominique Devriese <devriese@kde.org>
+
+// 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_LINE_IMP_H
+#define KIG_OBJECTS_LINE_IMP_H
+
+#include "curve_imp.h"
+
+#include "../misc/common.h"
+
+class LineData;
+
+/**
+ * An ObjectImp class that is the base of the line-like ObjectImp's:
+ * SegmentImp, LineImp and RayImp..
+ */
+class AbstractLineImp
+  : public CurveImp
+{
+protected:
+  LineData mdata;
+  AbstractLineImp( const LineData& d );
+  AbstractLineImp( const Coordinate& a, const Coordinate& b );
+
+public:
+  typedef CurveImp Parent;
+  /**
+   * Returns the ObjectImpType representing the AbstractLineImp
+   * type..
+   */
+  static const ObjectImpType* stype();
+
+  ~AbstractLineImp();
+
+  bool inRect( const Rect& r, int width, const KigWidget& ) const;
+
+  const uint numberOfProperties() const;
+  const QCStringList properties() const;
+  const QCStringList propertiesInternalNames() const;
+  ObjectImp* property( uint which, const KigDocument& d ) const;
+  const char* iconForProperty( uint which ) const;
+  const ObjectImpType* impRequirementForProperty( uint which ) const;
+  bool isPropertyDefinedOnOrThroughThisImp( uint which ) const;
+
+  /**
+   * Get the slope of this AbstractLineImp..  For a line through
+   * points a( xa, ya ) and b ( xb, yb ), this means the value ( yb -
+   * ya ) / ( xb - xa ).
+   */
+  double slope() const;
+  /**
+   * Get a string containing the equation of this line in the form "y
+   * = a * x + b ".
+   */
+  const QString equationString() const;
+  /**
+   * Get the LineData for this AbstractLineImp.
+   */
+  LineData data() const;
+
+  bool equals( const ObjectImp& rhs ) const;
+};
+
+/**
+ * An ObjectImp representing a segment
+ */
+class SegmentImp
+  : public AbstractLineImp
+{
+public:
+  typedef AbstractLineImp Parent;
+  /**
+   * Returns the ObjectImpType representing the SegmentImp
+   * type..
+   */
+  static const ObjectImpType* stype();
+
+  /**
+   * Construct a new segment from point a to point b.
+   */
+  SegmentImp( const Coordinate& a, const Coordinate& b );
+  /**
+   * Construct a new segment from a LineData.
+   */
+  SegmentImp( const LineData& d );
+
+  void draw( KigPainter& p ) const;
+  bool contains( const Coordinate& p, int width, const KigWidget& si ) const;
+  Rect surroundingRect() const;
+
+  ObjectImp* transform( const Transformation& ) const;
+
+  const Coordinate getPoint( double param, const KigDocument& ) const;
+  double getParam( const Coordinate&, const KigDocument& ) const;
+
+  const uint numberOfProperties() const;
+  const QCStringList properties() const;
+  const QCStringList propertiesInternalNames() const;
+  ObjectImp* property( uint which, const KigDocument& d ) const;
+  const char* iconForProperty( uint which ) const;
+  const ObjectImpType* impRequirementForProperty( uint which ) const;
+
+  SegmentImp* copy() const;
+
+  /**
+   * Get the length of this segment.
+   */
+  double length() const;
+
+  const ObjectImpType* type() const;
+  void visit( ObjectImpVisitor* vtor ) const;
+
+  bool containsPoint( const Coordinate& p, const KigDocument& doc ) const;
+  bool internalContainsPoint( const Coordinate& p, double threshold ) const;
+};
+
+/**
+ * An ObjectImp representing a ray. This means half of a line, it is
+ * infinite in one direction, but ends at a certain point in the other
+ * direction..
+ */
+class RayImp
+  : public AbstractLineImp
+{
+public:
+  typedef AbstractLineImp Parent;
+  /**
+   * Returns the ObjectImpType representing the RayImp
+   * type..
+   */
+  static const ObjectImpType* stype();
+
+  /**
+   * Construct a ray, starting at a, and going through b.
+   */
+  RayImp( const Coordinate& a, const Coordinate& b );
+  /**
+   * Construct a ray from a LineData.
+   */
+  RayImp( const LineData& d );
+
+  void draw( KigPainter& p ) const;
+  bool contains( const Coordinate& p, int width, const KigWidget& si ) const;
+  Rect surroundingRect() const;
+
+  ObjectImp* transform( const Transformation& ) const;
+
+  const Coordinate getPoint( double param, const KigDocument& ) const;
+  double getParam( const Coordinate&, const KigDocument& ) const;
+
+  RayImp* copy() const;
+
+  const ObjectImpType* type() const;
+  void visit( ObjectImpVisitor* vtor ) const;
+
+  bool containsPoint( const Coordinate& p, const KigDocument& doc ) const;
+  bool internalContainsPoint( const Coordinate& p, double threshold ) const;
+};
+
+/**
+ * An ObjectImp representing a line.
+ */
+class LineImp
+  : public AbstractLineImp
+{
+public:
+  typedef AbstractLineImp Parent;
+
+  /**
+   * Returns the ObjectImpType representing the LineImp
+   * type..
+   */
+  static const ObjectImpType* stype();
+
+  /**
+   * Construct a LineImp going through points a and b.
+   */
+  LineImp( const Coordinate& a, const Coordinate& b );
+  /**
+   * Construct a LineImp from a LineData.
+   */
+  LineImp( const LineData& d );
+  void draw( KigPainter& p ) const;
+  bool contains( const Coordinate& p, int width, const KigWidget& si ) const;
+  Rect surroundingRect() const;
+
+  ObjectImp* transform( const Transformation& ) const;
+
+  const Coordinate getPoint( double param, const KigDocument& ) const;
+  double getParam( const Coordinate&, const KigDocument& ) const;
+
+  LineImp* copy() const;
+
+  const ObjectImpType* type() const;
+  void visit( ObjectImpVisitor* vtor ) const;
+
+  bool containsPoint( const Coordinate& p, const KigDocument& doc ) const;
+  bool internalContainsPoint( const Coordinate& p, double threshold ) const;
+};
+
+#endif