Qwt User's Guide: QwtPointPolar Class Reference

Qwt User's Guide 6.1.3

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QwtPointPolar Class Reference

A point in polar coordinates. More...

`#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. More...
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()