Qwt User's Guide
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.
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

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:
azimuthAzimuth
radiusRadius
QwtPointPolar::QwtPointPolar ( const QwtPointPolar other) [inline]

Constructs a point using the values of the point specified.

Parameters:
otherOther point
QwtPointPolar::QwtPointPolar ( const QPointF &  p)

Convert and assign values from a point in Cartesian coordinates

Parameters:
pPoint in Cartesian coordinates
See also:
setPoint(), toPoint()

Member Function Documentation

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:
pPoint 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()

List of all members.

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