QwtPointPolar - Man Page

A point in polar coordinates.

Synopsis

#include <qwt_point_polar.h>

Public Member Functions

QwtPointPolar ()
QwtPointPolar (double azimuth, double radius)
QwtPointPolar (const QwtPointPolar &)
QwtPointPolar (const QPointF &)
void setPoint (const QPointF &)
QPointF toPoint () const
bool isValid () const
Returns true if radius() >= 0.0.
bool isNull () const
Returns true if radius() >= 0.0.
double radius () const
Returns the radius.
double azimuth () const
Returns the azimuth.
double & rRadius ()
Returns the radius.
double & rAzimuth ()
Returns the azimuth.
void setRadius (double)
Sets the radius to radius.
void setAzimuth (double)
Sets the atimuth to atimuth.
bool operator== (const QwtPointPolar &) const
Compare 2 points.
bool operator!= (const QwtPointPolar &) const
QwtPointPolar normalized () const

Detailed Description

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

Constructor & Destructor Documentation

QwtPointPolar::QwtPointPolar () [inline]

Constructs a null point, with a radius and azimuth set to 0.0.

See also

QPointF::isNull()

QwtPointPolar::QwtPointPolar (double azimuth, double radius) [inline]

Constructs a point with coordinates specified by radius and azimuth.

Parameters

azimuth Azimuth
radius Radius

QwtPointPolar::QwtPointPolar (const QwtPointPolar & other) [inline]

Constructs a point using the values of the point specified.

Parameters

other Other point

QwtPointPolar::QwtPointPolar (const QPointF & p)

Convert and assign values from a point in Cartesian coordinates

Parameters

p Point in Cartesian coordinates

See also

setPoint(), toPoint()

Member Function Documentation

QwtPointPolar QwtPointPolar::normalized () const

Normalize radius and azimuth

When the radius is < 0.0 it is set to 0.0. The azimuth is a value >= 0.0 and < 2 * M_PI.

Returns

Normalized point

bool QwtPointPolar::operator!= (const QwtPointPolar & other) const

Compare 2 points

Two points are equal to each other if radius and azimuth-coordinates are the same. Points are not equal, when the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).

Returns

True if the point is not equal to other; otherwise return false.

See also

normalized()

bool QwtPointPolar::operator== (const QwtPointPolar & other) const

Compare 2 points. Two points are equal to each other if radius and azimuth-coordinates are the same. Points are not equal, when the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).

Returns

True if the point is equal to other; otherwise return false.

See also

normalized()

void QwtPointPolar::setPoint (const QPointF & p)

Convert and assign values from a point in Cartesian coordinates

Parameters

p Point in Cartesian coordinates

QPointF QwtPointPolar::toPoint () const

Convert and return values in Cartesian coordinates

Returns

Converted point in Cartesian coordinates

Note

Invalid or null points will be returned as QPointF(0.0, 0.0)

See also

isValid(), isNull()

Author

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Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide