---
name: "QwtPointPolar"
section: "3"
platform: "linux"
package: "libqwt-doc"
version: "6.1.4-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/QwtPointPolar"
---

# QwtPointPolar(3)

A point in polar coordinates.

## NAME

QwtPointPolar - 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

Generated automatically by Doxygen for Qwt User's Guide from the source code.