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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_CIRCLE_IMP_H
#define KIG_OBJECTS_CIRCLE_IMP_H
#include "conic_imp.h"
/**
* An ObjectImp representing a circle. This class is a subclass of
* ConicImp, ensuring that a circle can be used as a conic.
*/
class CircleImp
: public ConicImp
{
Coordinate mcenter;
double mradius;
public:
typedef ConicImp Parent;
/**
* Returns the ObjectImpType representing the CircleImp type..
*/
static const ObjectImpType* stype();
/**
* Construct a Circle with a given center and radius.
*/
CircleImp( const Coordinate& center, double radius );
~CircleImp();
CircleImp* copy() 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;
double getParam( const Coordinate& point, const KigDocument& ) const;
const Coordinate getPoint( double param, const KigDocument& ) 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;
/**
* Return the center of this circle.
*/
const Coordinate center() const;
/**
* Return the radius of this circle.
*/
double radius() const;
/**
* Return the square radius of this circle. Use this in preference
* to sqr( radius() ).
*/
double squareRadius() const;
/**
* Return the surface of this circle.
*/
double surface() const;
/**
* Return the circumference of this circle.
*/
double circumference() const;
// trivial versions of the conic information functions..
/**
* Always returns 1, since a circle always is an ellipse.
*/
int conicType() const;
const ConicCartesianData cartesianData() const;
const ConicPolarData polarData() const;
/**
* The first focus of a circle is simply its center.
*/
Coordinate focus1() const;
/**
* The second focus of a circle is simply its center.
*/
Coordinate focus2() const;
/**
* Return a string containing the cartesian equation of this circle.
* This will be of the form "x^2 + y^2 + a x + b y + c = 0"
*/
QString cartesianEquationString( const KigDocument& w ) const;
/**
* Return a string containing the cartesian equation of this circle.
* This will be of the form "( x - x0 )^2 + ( y - y0 )^2 = r^2"
*/
QString simplyCartesianEquationString( const KigDocument& w ) const;
/**
* Return a string containing the polar equation of this circle.
* This will be of the form "rho = r [centered at p]"
*/
QString polarEquationString( const KigDocument& w ) const;
bool equals( const ObjectImp& rhs ) const;
};
#endif
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