A scale engine for logarithmic scales. More...

#include <qwt_scale_engine.h>

Inheritance diagram for QwtLogScaleEngine:

Public Member Functions
virtual void	autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const QWT_OVERRIDE

virtual QwtScaleDiv	divideScale (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize=0.0) const QWT_OVERRIDE
	Calculate a scale division for an interval. More...

	QwtLogScaleEngine (uint base=10)

virtual	~QwtLogScaleEngine ()
	Destructor. More...

Public Member Functions inherited from QwtScaleEngine
Attributes	attributes () const

uint	base () const

double	lowerMargin () const

	QwtScaleEngine (uint base=10)

double	reference () const

void	setAttribute (Attribute, bool on=true)

void	setAttributes (Attributes)

void	setBase (uint base)

void	setMargins (double lower, double upper)
	Specify margins at the scale's endpoints. More...

void	setReference (double)
	Specify a reference point. More...

void	setTransformation (QwtTransform *)

bool	testAttribute (Attribute) const

QwtTransform *	transformation () const

double	upperMargin () const

virtual	~QwtScaleEngine ()
	Destructor. More...

Protected Member Functions
QwtInterval	align (const QwtInterval &, double stepSize) const
	Align an interval to a step size. More...

QList< double >	buildMajorTicks (const QwtInterval &interval, double stepSize) const
	Calculate major ticks for an interval. More...

void	buildMinorTicks (const QList< double > &majorTicks, int maxMinorSteps, double stepSize, QList< double > &minorTicks, QList< double > &mediumTicks) const
	Calculate minor/medium ticks for major ticks. More...

void	buildTicks (const QwtInterval &, double stepSize, int maxMinorSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const
	Calculate ticks for an interval. More...

Protected Member Functions inherited from QwtScaleEngine
QwtInterval	buildInterval (double value) const
	Build an interval around a value. More...

bool	contains (const QwtInterval &, double value) const

double	divideInterval (double intervalSize, int numSteps) const

QList< double >	strip (const QList< double > &, const QwtInterval &) const

Additional Inherited Members
Public Types inherited from QwtScaleEngine
enum	Attribute { NoAttribute = 0x00, IncludeReference = 0x01, Symmetric = 0x02, Floating = 0x04, Inverted = 0x08 }

Detailed Description

A scale engine for logarithmic scales.

The step size is measured in decades and the major step size will be adjusted to fit the pattern $\left\{ 1,2,3,5\right\} \cdot 10^{n}$ , where n is a natural number including zero.

Warning: the step size as well as the margins are measured in decades.

Definition at line 191 of file qwt_scale_engine.h.

Constructor & Destructor Documentation

◆ QwtLogScaleEngine()

QwtLogScaleEngine::QwtLogScaleEngine ( uint base = 10 )

explicit

Constructor

Parameters

base	Base of the scale engine

See also: setBase()

Definition at line 776 of file qwt_scale_engine.cpp.

◆ ~QwtLogScaleEngine()

QwtLogScaleEngine::~QwtLogScaleEngine ( )

virtual

Destructor.

Definition at line 783 of file qwt_scale_engine.cpp.

Member Function Documentation

◆ align()

QwtInterval QwtLogScaleEngine::align	(	const QwtInterval &	interval,
		double	stepSize
	)		const

protected

Align an interval to a step size.

The limits of an interval are aligned that both are integer multiples of the step size.

Parameters

interval	Interval
stepSize	Step size

Returns: Aligned interval

Definition at line 1106 of file qwt_scale_engine.cpp.

◆ autoScale()

void QwtLogScaleEngine::autoScale	(	int	maxNumSteps,
		double &	x1,
		double &	x2,
		double &	stepSize
	)		const

virtual

Align and divide an interval

Parameters

maxNumSteps	Max. number of steps
x1	First limit of the interval (In/Out)
x2	Second limit of the interval (In/Out)
stepSize	Step size (Out)

See also: QwtScaleEngine::setAttribute()

Implements QwtScaleEngine.

Definition at line 797 of file qwt_scale_engine.cpp.

◆ buildMajorTicks()

QList< double > QwtLogScaleEngine::buildMajorTicks	(	const QwtInterval &	interval,
		double	stepSize
	)		const

protected

Calculate major ticks for an interval.

Parameters

interval	Interval
stepSize	Step size

Returns: Calculated ticks

Definition at line 967 of file qwt_scale_engine.cpp.

◆ buildMinorTicks()

void QwtLogScaleEngine::buildMinorTicks	(	const QList< double > &	majorTicks,
		int	maxMinorSteps,
		double	stepSize,
		QList< double > &	minorTicks,
		QList< double > &	mediumTicks
	)		const

protected

Calculate minor/medium ticks for major ticks.

Parameters

majorTicks	Major ticks
maxMinorSteps	Maximum number of minor steps
stepSize	Step size
minorTicks	Array to be filled with the calculated minor ticks
mediumTicks	Array to be filled with the calculated medium ticks

Definition at line 1002 of file qwt_scale_engine.cpp.

◆ buildTicks()

void QwtLogScaleEngine::buildTicks	(	const QwtInterval &	interval,
		double	stepSize,
		int	maxMinorSteps,
		QList< double >	ticks[QwtScaleDiv::NTickTypes]
	)		const

protected

Calculate ticks for an interval.

Parameters

interval	Interval
maxMinorSteps	Maximum number of minor steps
stepSize	Step size
ticks	Arrays to be filled with the calculated ticks

See also: buildMajorTicks(), buildMinorTicks

Definition at line 940 of file qwt_scale_engine.cpp.

◆ divideScale()

QwtScaleDiv QwtLogScaleEngine::divideScale	(	double	x1,
		double	x2,
		int	maxMajorSteps,
		int	maxMinorSteps,
		double	stepSize = `0.0`
	)		const

virtual

Calculate a scale division for an interval.

Parameters

x1	First interval limit
x2	Second interval limit
maxMajorSteps	Maximum for the number of major steps
maxMinorSteps	Maximum number of minor steps
stepSize	Step size. If stepSize == 0, the engine calculates one.

Returns: Calculated scale division

Implements QwtScaleEngine.

Definition at line 879 of file qwt_scale_engine.cpp.

The documentation for this class was generated from the following files:

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtLogScaleEngine()

◆ ~QwtLogScaleEngine()

Member Function Documentation

◆ align()

◆ autoScale()

◆ buildMajorTicks()

◆ buildMinorTicks()

◆ buildTicks()

◆ divideScale()