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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
/*! \file */
#ifndef _QWT_POINT_POLAR_H_
#define _QWT_POINT_POLAR_H_ 1
#include "qwt_global.h"
#include "qwt_math.h"
#include <qpoint.h>
#ifndef QT_NO_DEBUG_STREAM
#include <qdebug.h>
#endif
/*!
\brief A point in polar coordinates
In polar coordinates a point is determined by an angle and a distance.
See http://en.wikipedia.org/wiki/Polar_coordinate_system
*/
class QWT_EXPORT QwtPointPolar
{
public:
QwtPointPolar();
QwtPointPolar( double azimuth, double radius );
QwtPointPolar( const QwtPointPolar & );
QwtPointPolar( const QPointF & );
void setPoint( const QPointF & );
QPointF toPoint() const;
bool isValid() const;
bool isNull() const;
double radius() const;
double azimuth() const;
double &rRadius();
double &rAzimuth();
void setRadius( double );
void setAzimuth( double );
bool operator==( const QwtPointPolar & ) const;
bool operator!=( const QwtPointPolar & ) const;
QwtPointPolar normalized() const;
private:
double d_azimuth;
double d_radius;
};
/*!
Constructs a null point, with a radius and azimuth set to 0.0.
\sa QPointF::isNull()
*/
inline QwtPointPolar::QwtPointPolar():
d_azimuth( 0.0 ),
d_radius( 0.0 )
{
}
/*!
Constructs a point with coordinates specified by radius and azimuth.
\param azimuth Azimuth
\param radius Radius
*/
inline QwtPointPolar::QwtPointPolar( double azimuth, double radius ):
d_azimuth( azimuth ),
d_radius( radius )
{
}
/*!
Constructs a point using the values of the point specified.
\param other Other point
*/
inline QwtPointPolar::QwtPointPolar( const QwtPointPolar &other ):
d_azimuth( other.d_azimuth ),
d_radius( other.d_radius )
{
}
//! Returns true if radius() >= 0.0
inline bool QwtPointPolar::isValid() const
{
return d_radius >= 0.0;
}
//! Returns true if radius() >= 0.0
inline bool QwtPointPolar::isNull() const
{
return d_radius == 0.0;
}
//! Returns the radius.
inline double QwtPointPolar::radius() const
{
return d_radius;
}
//! Returns the azimuth.
inline double QwtPointPolar::azimuth() const
{
return d_azimuth;
}
//! Returns the radius.
inline double &QwtPointPolar::rRadius()
{
return d_radius;
}
//! Returns the azimuth.
inline double &QwtPointPolar::rAzimuth()
{
return d_azimuth;
}
//! Sets the radius to radius.
inline void QwtPointPolar::setRadius( double radius )
{
d_radius = radius;
}
//! Sets the atimuth to atimuth.
inline void QwtPointPolar::setAzimuth( double azimuth )
{
d_azimuth = azimuth;
}
#ifndef QT_NO_DEBUG_STREAM
QWT_EXPORT QDebug operator<<( QDebug, const QwtPointPolar & );
#endif
inline QPoint qwtPolar2Pos( const QPoint &pole,
double radius, double angle )
{
const double x = pole.x() + radius * qCos( angle );
const double y = pole.y() - radius * qSin( angle );
return QPoint( qRound( x ), qRound( y ) );
}
inline QPoint qwtDegree2Pos( const QPoint &pole,
double radius, double angle )
{
return qwtPolar2Pos( pole, radius, angle / 180.0 * M_PI );
}
inline QPointF qwtPolar2Pos( const QPointF &pole,
double radius, double angle )
{
const double x = pole.x() + radius * qCos( angle );
const double y = pole.y() - radius * qSin( angle );
return QPointF( x, y);
}
inline QPointF qwtDegree2Pos( const QPointF &pole,
double radius, double angle )
{
return qwtPolar2Pos( pole, radius, angle / 180.0 * M_PI );
}
inline QPointF qwtFastPolar2Pos( const QPointF &pole,
double radius, double angle )
{
#if QT_VERSION < 0x040601
const double x = pole.x() + radius * ::cos( angle );
const double y = pole.y() - radius * ::sin( angle );
#else
const double x = pole.x() + radius * qFastCos( angle );
const double y = pole.y() - radius * qFastSin( angle );
#endif
return QPointF( x, y);
}
inline QPointF qwtFastDegree2Pos( const QPointF &pole,
double radius, double angle )
{
return qwtFastPolar2Pos( pole, radius, angle / 180.0 * M_PI );
}
inline QwtPointPolar qwtFastPos2Polar( const QPointF &pos )
{
return QwtPointPolar( qwtFastAtan2( pos.y(), pos.x() ),
qSqrt( qwtSqr( pos.x() ) + qwtSqr( pos.y() ) ) );
}
#endif