An abstract base class for widgets having a scale 更多...

#include <qwt_abstract_scale.h>

类 QwtAbstractScale 继承关系图:

类
class	PrivateData

Public 成员函数
	QwtAbstractScale (QWidget *parent=nullptr)
	Constructor for QwtAbstractScale

void	setScale (double lowerBound, double upperBound)
	Specify a scale by interval bounds

void	setScale (const QwtInterval &)
	Specify a scale by interval

void	setScale (const QwtScaleDiv &)
	Specify a scale by scale division

const QwtScaleDiv &	scaleDiv () const
	Return the scale division

void	setLowerBound (double value)
	Set the lower bound of the scale

double	lowerBound () const
	Return the lower bound of the scale

void	setUpperBound (double value)
	Set the upper bound of the scale

double	upperBound () const
	Return the upper bound of the scale

void	setScaleStepSize (double stepSize)
	Set the step size used for calculating scale division

double	scaleStepSize () const
	Return the step size hint

void	setScaleMaxMajor (int ticks)
	Set the maximum number of major tick intervals

int	scaleMaxMinor () const
	Return the maximum number of minor tick intervals

void	setScaleMaxMinor (int ticks)
	Set the maximum number of minor tick intervals

int	scaleMaxMajor () const
	Return the maximum number of major tick intervals

void	setScaleEngine (QwtScaleEngine *)
	Set the scale engine

const QwtScaleEngine *	scaleEngine () const
	Return the scale engine (const version)

QwtScaleEngine *	scaleEngine ()
	Return the scale engine (non-const version)

int	transform (double) const
	Transform a scale value to widget coordinates

double	invTransform (int) const
	Transform a widget coordinate to scale value

bool	isInverted () const
	Check if scale is inverted

double	minimum () const
	Return the minimum boundary

double	maximum () const
	Return the maximum boundary

const QwtScaleMap &	scaleMap () const
	Return the scale map

Protected 成员函数
virtual void	changeEvent (QEvent *) override
	Handle change events (English only)

void	rescale (double lowerBound, double upperBound, double stepSize)
	Recalculate scale and update scale draw (English only)

void	setAbstractScaleDraw (QwtAbstractScaleDraw *)
	Set the scale draw object (English only)

const QwtAbstractScaleDraw *	abstractScaleDraw () const
	Return the scale draw (const version) (English only)

QwtAbstractScaleDraw *	abstractScaleDraw ()
	Return the scale draw (non-const version) (English only)

void	updateScaleDraw ()
	Update the scale draw (English only)

virtual void	scaleChange ()
	Notify about scale changes (English only)

属性
double	lowerBound

double	upperBound

int	scaleMaxMajor

int	scaleMaxMinor

double	scaleStepSize

详细描述

An abstract base class for widgets having a scale

The scale of an QwtAbstractScale is determined by a QwtScaleDiv definition that contains the boundaries and the ticks of the scale. The scale is painted using a QwtScaleDraw object. The scale division might be assigned explicitly - but usually it is calculated from the boundaries using a QwtScaleEngine. The scale engine also decides the type of transformation of the scale (linear, logarithmic ...).

构造及析构函数说明

◆ QwtAbstractScale()

QwtAbstractScale::QwtAbstractScale ( QWidget * parent = nullptr )

explicit

Constructor for QwtAbstractScale

参数

parent Parent widget

Creates a default QwtScaleDraw and a QwtLinearScaleEngine. The initial scale boundaries are set to [ 0.0, 100.0 ] The scaleStepSize() is initialized to 0.0, scaleMaxMajor() to 5 and scaleMaxMinor to 3.

Destructor for QwtAbstractScale

成员函数说明

◆ abstractScaleDraw() [1/2]

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( )

protected

Return the scale draw (non-const version) (English only)

Return the scale draw object (non-const)

返回: Scale draw object

参见: setAbstractScaleDraw()

◆ abstractScaleDraw() [2/2]

const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( ) const

protected

Return the scale draw (const version) (English only)

Return the scale draw object (const)

返回: Scale draw object

参见: setAbstractScaleDraw()

◆ changeEvent()

void QwtAbstractScale::changeEvent ( QEvent * event )

overrideprotectedvirtual

Handle change events (English only)

Handle change events

参数

event Change event

Invalidates internal caches if necessary (e.g., on locale change).

被 QwtDial, QwtKnob, QwtSlider , 以及 QwtThermo 重载.

◆ invTransform()

double QwtAbstractScale::invTransform ( int value ) const

Transform a widget coordinate to scale value

参数

value Widget coordinate

返回: Corresponding scale coordinate for value

参见: scaleMap(), transform()

◆ isInverted()

bool QwtAbstractScale::isInverted ( ) const

Check if scale is inverted

返回: True if scale is increasing in opposite direction to widget coordinates

◆ lowerBound()

double QwtAbstractScale::lowerBound ( ) const

Return the lower bound of the scale

返回: Lower bound value

参见: setLowerBound(), setScale(), upperBound()

◆ maximum()

double QwtAbstractScale::maximum ( ) const

Return the maximum boundary

返回: The boundary with the larger value

参见: minimum(), lowerBound(), upperBound()

◆ minimum()

double QwtAbstractScale::minimum ( ) const

Return the minimum boundary

返回: The boundary with the smaller value

参见: maximum(), lowerBound(), upperBound()

◆ rescale()

void QwtAbstractScale::rescale	(	double	lowerBound,
		double	upperBound,
		double	stepSize
	)

protected

Recalculate scale and update scale draw (English only)

Recalculate scale division and update scale

参数

lowerBound	Lower limit of the scale interval
upperBound	Upper limit of the scale interval
stepSize	Major step size

参见: scaleChange()

◆ scaleChange()

void QwtAbstractScale::scaleChange ( )

protectedvirtual

Notify about scale changes (English only)

Notify about scale changes

This virtual function is called when the scale changes. Override this function in derived classes to handle scale changes.

被 QwtAbstractSlider, QwtDial, QwtSlider , 以及 QwtThermo 重载.

◆ scaleDiv()

const QwtScaleDiv & QwtAbstractScale::scaleDiv ( ) const

Return the scale division

返回: Scale boundaries and positions of the ticks

The scale division might have been assigned explicitly or calculated implicitly by rescale().

◆ scaleEngine() [1/2]

QwtScaleEngine * QwtAbstractScale::scaleEngine ( )

Return the scale engine (non-const version)

返回: Scale engine object

参见: setScaleEngine()

◆ scaleEngine() [2/2]

const QwtScaleEngine * QwtAbstractScale::scaleEngine ( ) const

Return the scale engine (const version)

返回: Scale engine object

参见: setScaleEngine()

◆ scaleMap()

const QwtScaleMap & QwtAbstractScale::scaleMap ( ) const

Return the scale map

返回: Map to translate between scale and widget coordinates

◆ scaleMaxMajor()

int QwtAbstractScale::scaleMaxMajor ( ) const

Return the maximum number of major tick intervals

返回: Maximal number of major tick intervals

参见: setScaleMaxMajor(), scaleMaxMinor()

◆ scaleMaxMinor()

int QwtAbstractScale::scaleMaxMinor ( ) const

Return the maximum number of minor tick intervals

返回: Maximal number of minor tick intervals

参见: setScaleMaxMinor(), scaleMaxMajor()

◆ scaleStepSize()

double QwtAbstractScale::scaleStepSize ( ) const

Return the step size hint

返回: Hint for the step size of the scale

参见: setScaleStepSize(), QwtScaleEngine::divideScale()

◆ setAbstractScaleDraw()

void QwtAbstractScale::setAbstractScaleDraw ( QwtAbstractScaleDraw * scaleDraw )

protected

Set the scale draw object (English only)

Set the scale draw object

scaleDraw must be created with new and will be deleted in the destructor or the next call of setAbstractScaleDraw().

参见: abstractScaleDraw()

◆ setLowerBound()

void QwtAbstractScale::setLowerBound ( double value )

Set the lower bound of the scale

参数

value Lower bound value

参见: lowerBound(), setScale(), setUpperBound()

注解: For inverted scales, the lower bound is greater than the upper bound

◆ setScale() [1/3]

void QwtAbstractScale::setScale ( const QwtInterval & interval )

Specify a scale by interval

Define a scale by an interval. The ticks are calculated using scaleMaxMinor(), scaleMaxMajor() and scaleStepSize().

参数

interval Interval object

◆ setScale() [2/3]

void QwtAbstractScale::setScale ( const QwtScaleDiv & scaleDiv )

Specify a scale by scale division

When using this method, scaleMaxMinor(), scaleMaxMajor() and scaleStepSize() have no effect.

参数

scaleDiv Scale division object

参见: setAutoScale()

◆ setScale() [3/3]

void QwtAbstractScale::setScale	(	double	lowerBound,
		double	upperBound
	)

Specify a scale by interval bounds

Define a scale by an interval. The ticks are calculated using scaleMaxMinor(), scaleMaxMajor() and scaleStepSize().

参数

lowerBound	Lower limit of the scale interval
upperBound	Upper limit of the scale interval

注解: For inverted scales, the lower bound is greater than the upper bound

◆ setScaleEngine()

void QwtAbstractScale::setScaleEngine ( QwtScaleEngine * scaleEngine )

Set the scale engine

The scale engine is responsible for calculating the scale division and provides a transformation between scale and widget coordinates. scaleEngine must be created with new and will be deleted in the destructor or the next call of setScaleEngine().

参数

scaleEngine Scale engine object

◆ setScaleMaxMajor()

void QwtAbstractScale::setScaleMaxMajor ( int ticks )

Set the maximum number of major tick intervals

The scale's major ticks are calculated automatically such that the number of major intervals does not exceed ticks. The default value is 5.

参数

ticks Maximal number of major ticks

参见: scaleMaxMajor(), setScaleMaxMinor(), setScaleStepSize(), QwtScaleEngine::divideInterval()

◆ setScaleMaxMinor()

void QwtAbstractScale::setScaleMaxMinor ( int ticks )

Set the maximum number of minor tick intervals

The scale's minor ticks are calculated automatically such that the number of minor intervals does not exceed ticks. The default value is 3.

参数

ticks Maximal number of minor ticks

参见: scaleMaxMajor(), setScaleMaxMinor(), setScaleStepSize(), QwtScaleEngine::divideInterval()

◆ setScaleStepSize()

void QwtAbstractScale::setScaleStepSize ( double stepSize )

Set the step size used for calculating scale division

The step size is a hint for calculating the intervals for the major ticks of the scale. A value of 0.0 is interpreted as no hint.

参数

stepSize Hint for the step size of the scale

参见: scaleStepSize(), QwtScaleEngine::divideScale()

注解: Position and distance between major ticks also depends on scaleMaxMajor()

◆ setUpperBound()

void QwtAbstractScale::setUpperBound ( double value )

Set the upper bound of the scale

参数

value Upper bound value

参见: upperBound(), setScale(), setLowerBound()

注解: For inverted scales, the lower bound is greater than the upper bound

◆ transform()

int QwtAbstractScale::transform ( double value ) const

Transform a scale value to widget coordinates

参数

value Scale value

返回: Corresponding widget coordinate for value

参见: scaleMap(), invTransform()

◆ updateScaleDraw()

void QwtAbstractScale::updateScaleDraw ( )

protected

Update the scale draw (English only)

Recalculate ticks and scale boundaries

Updates the scale draw by recalculating ticks and boundaries based on the current scale division.

◆ upperBound()

double QwtAbstractScale::upperBound ( ) const

Return the upper bound of the scale

返回: Upper bound value

参见: setUpperBound(), setScale(), lowerBound()

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_abstract_scale.h
/home/runner/work/QWT/QWT/src/plot/qwt_abstract_scale.cpp

类

Public 成员函数

Protected 成员函数

属性

详细描述

构造及析构函数说明

◆ QwtAbstractScale()

成员函数说明

◆ abstractScaleDraw() [1/2]

◆ abstractScaleDraw() [2/2]

◆ changeEvent()

◆ invTransform()

◆ isInverted()

◆ lowerBound()

◆ maximum()

◆ minimum()

◆ rescale()

◆ scaleChange()

◆ scaleDiv()

◆ scaleEngine() [1/2]

◆ scaleEngine() [2/2]

◆ scaleMap()

◆ scaleMaxMajor()

◆ scaleMaxMinor()

◆ scaleStepSize()

◆ setAbstractScaleDraw()

◆ setLowerBound()

◆ setScale() [1/3]

◆ setScale() [2/3]

◆ setScale() [3/3]

◆ setScaleEngine()

◆ setScaleMaxMajor()

◆ setScaleMaxMinor()

◆ setScaleStepSize()

◆ setUpperBound()

◆ transform()

◆ updateScaleDraw()

◆ upperBound()