A scale engine for logarithmic scales. More...

#include <qwt_scale_engine.h>

Inheritance diagram for QwtLogScaleEngine:

Public Member Functions
virtual void	autoScale (int maxSteps, double &x1, double &x2, double &stepSize) const
virtual QwtScaleDiv	divideScale (double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const
	Calculate a scale division for an interval.
	QwtLogScaleEngine (uint base=10)
virtual	~QwtLogScaleEngine ()
	Destructor.
Protected Member Functions
QwtInterval	align (const QwtInterval &, double stepSize) const
	Align an interval to a step size.
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.
void	buildTicks (const QwtInterval &, double stepSize, int maxMinSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const
	Calculate ticks for an interval.

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 192 of file qwt_scale_engine.h.

Constructor & Destructor Documentation

QwtLogScaleEngine::QwtLogScaleEngine ( uint base = 10 ) [explicit]

Constructor

Parameters:

base	Base of the scale engine

See also:: setBase()

Definition at line 778 of file qwt_scale_engine.cpp.

QwtLogScaleEngine::~QwtLogScaleEngine ( ) [virtual]

Destructor.

Definition at line 785 of file qwt_scale_engine.cpp.

Member Function Documentation

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.

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 799 of file qwt_scale_engine.cpp.

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 968 of file qwt_scale_engine.cpp.

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.

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 941 of file qwt_scale_engine.cpp.

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 880 of file qwt_scale_engine.cpp.

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

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation