QwtPointPolar类 参考

A point in polar coordinates 更多...

#include <qwt_point_polar.h>

Public 成员函数
	QwtPointPolar ()
	Default constructor - constructs a null point with radius and azimuth set to 0.0
	QwtPointPolar (double azimuth, double radius)
	Constructs a point with coordinates specified by radius and azimuth
	QwtPointPolar (const QPointF &)
	Convert and assign values from a point in Cartesian coordinates
void	setPoint (const QPointF &)
	Convert and assign values from a point in Cartesian coordinates
QPointF	toPoint () const
	Convert and return values in Cartesian coordinates
bool	isValid () const noexcept
	Return true if radius() >= 0.0
bool	isNull () const noexcept
	Return true if radius() == 0.0
double	radius () const noexcept
	Return the radius
double	azimuth () const noexcept
	Return the azimuth
double &	rRadius () noexcept
	Return a reference to the radius
double &	rAzimuth () noexcept
	Return a reference to the azimuth
void	setRadius (double) noexcept
	Set the radius to radius
void	setAzimuth (double) noexcept
	Set the azimuth to azimuth
bool	operator== (const QwtPointPolar &) const
	Compare 2 points
bool	operator!= (const QwtPointPolar &) const
	Compare 2 points
QwtPointPolar	normalized () const
	Normalize radius and azimuth

详细描述

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

构造及析构函数说明

QwtPointPolar() [1/3]

QwtPointPolar::QwtPointPolar ( )

inline

Default constructor - constructs a null point with radius and azimuth set to 0.0

参见

QPointF::isNull()

QwtPointPolar() [2/3]

QwtPointPolar::QwtPointPolar ( double  azimuth, double  radius  )

inline

Constructs a point with coordinates specified by radius and azimuth

参数

azimuth	Azimuth (angle)
radius	Radius (distance)

QwtPointPolar() [3/3]

QwtPointPolar::QwtPointPolar

(

const QPointF &

p

)

Convert and assign values from a point in Cartesian coordinates

参数

[in]

p

Point in Cartesian coordinates

参见

setPoint(), toPoint()

成员函数说明

normalized()

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.

返回

Normalized point

operator!=()

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).

返回

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

参见

normalized()

operator==()

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).

返回

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

参见

normalized()

setPoint()

void QwtPointPolar::setPoint

(

const QPointF &

p

)

Convert and assign values from a point in Cartesian coordinates

参数

[in]

p

Point in Cartesian coordinates

参见

QwtPointPolar(QPointF), toPoint()

toPoint()

QPointF QwtPointPolar::toPoint

(

)

const

Convert and return values in Cartesian coordinates

返回

Converted point in Cartesian coordinates

注解

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

参见

isValid(), isNull()

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/core/qwt_point_polar.h
• /home/runner/work/QWT/QWT/src/core/qwt_point_polar.cpp