A scale engine for linear scales. More...

#include <qwt_scale_engine.h>

Inheritance diagram for QwtLinearScaleEngine:

Public Member Functions
	QwtLinearScaleEngine (uint base=10)

virtual	~QwtLinearScaleEngine ()
	Destructor.

virtual void	autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const override

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

Public Member Functions inherited from QwtScaleEngine
	QwtScaleEngine (uint base=10)

virtual	~QwtScaleEngine ()
	Destructor.

void	setBase (uint base)

uint	base () const

void	setAttribute (Attribute, bool on=true)

bool	testAttribute (Attribute) const

void	setAttributes (Attributes)

Attributes	attributes () const

void	setReference (double)
	Specify a reference point.

double	reference () const

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

double	lowerMargin () const

double	upperMargin () const

void	setTransformation (QwtTransform *)

QwtTransform *	transformation () const

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

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

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

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

Protected Member Functions inherited from QwtScaleEngine
bool	contains (const QwtInterval &, double value) const

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

double	divideInterval (double intervalSize, int numSteps) const

QwtInterval	buildInterval (double value) const
	Build an interval around a value.

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

typedef QFlags< Attribute >	Attributes

Detailed Description

A scale engine for linear scales.

The step size will fit into the pattern $\left\{ 1,2,5\right\} \cdot 10^{n}$ , where n is an integer.

Definition at line 151 of file qwt_scale_engine.h.

Constructor & Destructor Documentation

◆ QwtLinearScaleEngine()

QwtLinearScaleEngine::QwtLinearScaleEngine ( uint base = 10 )

explicit

Constructor

Parameters

base	Base of the scale engine

See also: setBase()

Definition at line 511 of file qwt_scale_engine.cpp.

◆ ~QwtLinearScaleEngine()

QwtLinearScaleEngine::~QwtLinearScaleEngine ( )

virtual

Destructor.

Definition at line 517 of file qwt_scale_engine.cpp.

Member Function Documentation

◆ align()

QwtInterval QwtLinearScaleEngine::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 741 of file qwt_scale_engine.cpp.

◆ autoScale()

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

overridevirtual

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: setAttribute()

Implements QwtScaleEngine.

Reimplemented in QwtDateScaleEngine.

Definition at line 531 of file qwt_scale_engine.cpp.

◆ buildMajorTicks()

QList< double > QwtLinearScaleEngine::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 664 of file qwt_scale_engine.cpp.

◆ buildMinorTicks()

void QwtLinearScaleEngine::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 692 of file qwt_scale_engine.cpp.

◆ buildTicks()

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

protected

Calculate ticks for an interval.

Parameters

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

See also: buildMajorTicks(), buildMinorTicks

Definition at line 627 of file qwt_scale_engine.cpp.

◆ divideScale()

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

overridevirtual

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.

Reimplemented in QwtDateScaleEngine.

Definition at line 577 of file qwt_scale_engine.cpp.

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtLinearScaleEngine()

◆ ~QwtLinearScaleEngine()

Member Function Documentation

◆ align()

◆ autoScale()

◆ buildMajorTicks()

◆ buildMinorTicks()

◆ buildTicks()

◆ divideScale()