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+// Copyright (C)  2003  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_CONIC_IMP_H
+#define KIG_OBJECTS_CONIC_IMP_H
+
+#include "curve_imp.h"
+
+#include "../misc/conic-common.h"
+
+/**
+ * An ObjectImp representing a conic.
+ *
+ * A conic is a general second degree curve, and some beautiful theory
+ * has been developed about it..  See a math book for more
+ * information.  This class is in fact an abstract base class hiding
+ * the fact that a ConicImp can be constructed in two ways.  If only
+ * its Cartesian equation is known, then you should use ConicImpCart,
+ * otherwise, you should use ConicImpPolar.  If the other
+ * representation is needed, it will be calculated, but a cartesian
+ * representation is rarely needed, and not calculating saves some CPU
+ * cycles.
+ */
+class ConicImp
+  : public CurveImp
+{
+protected:
+  ConicImp();
+  ~ConicImp();
+public:
+  typedef CurveImp Parent;
+  /**
+   * Returns the ObjectImpType representing the ConicImp type.
+   */
+  static const ObjectImpType* stype();
+
+  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 ObjectImpType* impRequirementForProperty( uint which ) const;
+  bool isPropertyDefinedOnOrThroughThisImp( uint which ) const;
+  const QCStringList properties() const;
+  const QCStringList propertiesInternalNames() const;
+  const char* iconForProperty( uint which ) const;
+  ObjectImp* property( uint which, const KigDocument& w ) const;
+
+  double getParam( const Coordinate& point, const KigDocument& ) const;
+  const Coordinate getPoint( double param, const KigDocument& ) const;
+
+  // information about ourselves..  These are all virtual, because a
+  // trivial subclass like CircleImp can override these with trivial
+  // versions..
+
+  /**
+   * Type of conic.
+   * Return what type of conic this is:
+   * -1 for a hyperbola
+   * 0 for a parabola
+   * 1 for an ellipse
+   */
+  virtual int conicType() const;
+  /**
+   * A string containing "Hyperbola", "Parabola" or "Ellipse".
+   */
+  virtual QString conicTypeString() const;
+  /**
+   * A string containing the cartesian equation of the conic.  This
+   * will be of the form "a x^2 + b y^2 + c xy + d x + e y + f = 0".
+   */
+  virtual QString cartesianEquationString( const KigDocument& w ) const;
+  /**
+   * A string containing the polar equation of the conic.  This will
+   * be of the form "rho = pdimen/(1 + ect cos( theta ) + est sin(
+   * theta ) )\n    [centered at p]"
+   */
+  virtual QString polarEquationString( const KigDocument& w ) const;
+  /**
+   * Return the cartesian representation of this conic.
+   */
+  virtual const ConicCartesianData cartesianData() const;
+  /**
+   * Return the polar representation of this conic.
+   */
+  virtual const ConicPolarData polarData() const = 0;
+  /**
+   * Return the first focus of this conic.
+   */
+  virtual Coordinate focus1() const;
+  /**
+   * Return the second focus of this conic.
+   */
+  virtual Coordinate focus2() const;
+
+  const ObjectImpType* type() const;
+  void visit( ObjectImpVisitor* vtor ) const;
+
+  bool equals( const ObjectImp& rhs ) const;
+
+  bool containsPoint( const Coordinate& p, const KigDocument& doc ) const;
+  bool internalContainsPoint( const Coordinate& p, double threshold ) const;
+};
+
+/**
+ * An implementation of ConicImp to be used when only the cartesian
+ * equation of the conic is known.
+ */
+class ConicImpCart
+  : public ConicImp
+{
+  ConicCartesianData mcartdata;
+  ConicPolarData mpolardata;
+public:
+  ConicImpCart( const ConicCartesianData& data );
+  ~ConicImpCart();
+  ConicImpCart* copy() const;
+
+  const ConicCartesianData cartesianData() const;
+  const ConicPolarData polarData() const;
+};
+
+/**
+ * An implementation of ConicImp to be used when only the cartesian
+ * equation of the conic is known.
+ */
+class ConicImpPolar
+  : public ConicImp
+{
+  ConicPolarData mdata;
+public:
+  ConicImpPolar( const ConicPolarData& data );
+  ~ConicImpPolar();
+  ConicImpPolar* copy() const;
+
+  const ConicPolarData polarData() const;
+};
+
+#endif