A scale map 更多...

#include <qwt_scale_map.h>

Public 成员函数
	QwtScaleMap ()
	Default constructor

	QwtScaleMap (const QwtScaleMap &)
	Copy constructor

	QwtScaleMap (QwtScaleMap &&)
	Move constructor

	~QwtScaleMap ()
	Destructor

QwtScaleMap &	operator= (const QwtScaleMap &)
	Copy assignment operator

QwtScaleMap &	operator= (QwtScaleMap &&)
	Move assignment operator

void	setTransformation (QwtTransform *)
	Set the transformation (takes ownership)

const QwtTransform *	transformation () const
	Return the transformation

void	setPaintInterval (double p1, double p2)
	Set the paint device interval boundaries

void	setScaleInterval (double s1, double s2)
	Set the scale interval boundaries

double	transform (double s) const
	Transform a scale value to paint device coordinate

double	invTransform (double p) const
	Transform a paint device coordinate to scale value

constexpr double	p1 () const noexcept
	Return first border of paint interval

constexpr double	p2 () const noexcept
	Return second border of paint interval

constexpr double	s1 () const noexcept
	Return first border of scale interval

constexpr double	s2 () const noexcept
	Return second border of scale interval

double	pDist () const
	Return distance between paint interval boundaries

double	sDist () const
	Return distance between scale interval boundaries

constexpr bool	isLinear () const noexcept
	Check if this scale has no nonlinear transformation

constexpr bool	isInverting () const noexcept
	Check if the mapping direction is inverted

constexpr double	cnv () const noexcept
	Conversion factor for linear fast-path: result = p1() + (value - ts1()) * cnv()

constexpr double	ts1 () const noexcept
	Transformed scale origin for linear fast-path

静态 Public 成员函数
static QRectF	transform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
	Transform a rectangle from scale to paint coordinates

static QRectF	invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
	Transform a rectangle from paint to scale coordinates

static QPointF	transform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
	Transform a point from scale to paint coordinates

static QPointF	invTransform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
	Transform a point from paint to scale coordinates

static bool	isLinerScale (const QwtScaleMap &sm)
	Check if the scale is linear (no transformation)

Protected 成员函数
void	swap (QwtScaleMap &other) noexcept

详细描述

A scale map

QwtScaleMap offers transformations from the coordinate system of a scale into the linear coordinate system of a paint device and vice versa.

参见: QwtTransform, QwtScaleDiv

构造及析构函数说明

◆ QwtScaleMap()

QwtScaleMap::QwtScaleMap ( )

Default constructor

The scale and paint device intervals are both set to [0,1].

成员函数说明

◆ cnv()

constexpr double QwtScaleMap::cnv ( ) const

inlineconstexprnoexcept

Conversion factor for linear fast-path: result = p1() + (value - ts1()) * cnv()

Return the conversion factor for linear fast-path transform

◆ invTransform() [1/3]

QPointF QwtScaleMap::invTransform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QPointF &	pos
	)

static

Transform a point from paint to scale coordinates

参数

xMap	X axis scale map
yMap	Y axis scale map
pos	Position in paint coordinates

返回: Position in scale coordinates

参见: transform()

◆ invTransform() [2/3]

QRectF QwtScaleMap::invTransform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	rect
	)

static

Transform a rectangle from paint to scale coordinates

参数

xMap	X axis scale map
yMap	Y axis scale map
rect	Rectangle in paint coordinates

返回: Rectangle in scale coordinates

参见: transform()

◆ invTransform() [3/3]

double QwtScaleMap::invTransform ( double p ) const

inline

Transform a paint device coordinate to scale value

Transform a paint device value into a value in the interval of the scale

参数

p	Value relative to the coordinates of the paint device

返回: Transformed value

参见: transform()

◆ isInverting()

constexpr bool QwtScaleMap::isInverting ( ) const

inlineconstexprnoexcept

Check if the mapping direction is inverted

Return true when ( p1() < p2() ) != ( s1() < s2() )

◆ isLinear()

constexpr bool QwtScaleMap::isLinear ( ) const

inlineconstexprnoexcept

Check if this scale has no nonlinear transformation

Return true when there is no nonlinear transformation

◆ isLinerScale()

bool QwtScaleMap::isLinerScale ( const QwtScaleMap & sm )

static

Check if the scale is linear (no transformation)

参数

sm	Scale map to check

返回: True if the scale has no transformation (linear scale)

◆ operator=()

QwtScaleMap & QwtScaleMap::operator= ( const QwtScaleMap & other )

Copy assignment operator

Assignment operator

◆ p1()

constexpr double QwtScaleMap::p1 ( ) const

inlineconstexprnoexcept

Return first border of paint interval

Return first border of the paint interval

◆ p2()

constexpr double QwtScaleMap::p2 ( ) const

inlineconstexprnoexcept

Return second border of paint interval

Return second border of the paint interval

◆ pDist()

double QwtScaleMap::pDist ( ) const

inline

Return distance between paint interval boundaries

Return qwtAbs(p2() - p1())

◆ s1()

constexpr double QwtScaleMap::s1 ( ) const

inlineconstexprnoexcept

Return first border of scale interval

Return first border of the scale interval

◆ s2()

constexpr double QwtScaleMap::s2 ( ) const

inlineconstexprnoexcept

Return second border of scale interval

Return second border of the scale interval

◆ sDist()

double QwtScaleMap::sDist ( ) const

inline

Return distance between scale interval boundaries

Return qwtAbs(s2() - s1())

◆ setPaintInterval()

void QwtScaleMap::setPaintInterval	(	double	p1,
		double	p2
	)

Set the paint device interval boundaries

Specify the borders of the paint device interval

参数

p1	First border
p2	Second border

◆ setScaleInterval()

void QwtScaleMap::setScaleInterval	(	double	s1,
		double	s2
	)

Set the scale interval boundaries

Specify the borders of the scale interval

Scales might be aligned to transformation depending boundaries

参数

s1	First border
s2	Second border

◆ setTransformation()

void QwtScaleMap::setTransformation ( QwtTransform * transform )

Set the transformation (takes ownership)

Initialize the map with a transformation

参数

transform Transformation object (takes ownership)

◆ transform() [1/3]

QPointF QwtScaleMap::transform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QPointF &	pos
	)

static

Transform a point from scale to paint coordinates

参数

xMap	X axis scale map
yMap	Y axis scale map
pos	Position in scale coordinates

返回: Position in paint coordinates

参见: invTransform()

◆ transform() [2/3]

QRectF QwtScaleMap::transform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	rect
	)

static

Transform a rectangle from scale to paint coordinates

参数

xMap	X axis scale map
yMap	Y axis scale map
rect	Rectangle in scale coordinates

返回: Rectangle in paint coordinates

参见: invTransform()

◆ transform() [3/3]

double QwtScaleMap::transform ( double s ) const

inline

Transform a scale value to paint device coordinate

Transform a point related to the scale interval into a point related to the paint device interval

参数

s	Value relative to the coordinates of the scale

返回: Transformed value

参见: invTransform()

◆ transformation()

const QwtTransform * QwtScaleMap::transformation ( ) const

Return the transformation

Get the transformation

返回: Transformation object

◆ ts1()

constexpr double QwtScaleMap::ts1 ( ) const

inlineconstexprnoexcept

Transformed scale origin for linear fast-path

Return the transformed scale origin for linear fast-path transform

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/core/qwt_scale_map.h
/home/runner/work/QWT/QWT/src/core/qwt_scale_map.cpp

Public 成员函数

静态 Public 成员函数

Protected 成员函数

详细描述

构造及析构函数说明

◆ QwtScaleMap()

成员函数说明

◆ cnv()

◆ invTransform() [1/3]

◆ invTransform() [2/3]

◆ invTransform() [3/3]

◆ isInverting()

◆ isLinear()

◆ isLinerScale()

◆ operator=()

◆ p1()

◆ p2()

◆ pDist()

◆ s1()

◆ s2()

◆ sDist()

◆ setPaintInterval()

◆ setScaleInterval()

◆ setTransformation()

◆ transform() [1/3]

◆ transform() [2/3]

◆ transform() [3/3]

◆ transformation()

◆ ts1()