QwtLog10ScaleEngine Class Reference

#include <qwt_scale_engine.h>

Inheritance diagram for QwtLog10ScaleEngine:

List of all members.

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
virtual QwtScaleTransformation *	transformation () const
Public Member Functions inherited from QwtScaleEngine
	QwtScaleEngine ()
virtual	~QwtScaleEngine ()
int	attributes () const
double	lowerMargin () const
double	reference () const
void	setAttribute (Attribute, bool on=true)
void	setAttributes (int)
void	setMargins (double lower, double upper)
void	setReference (double reference)
bool	testAttribute (Attribute) const
double	upperMargin () const

Protected Member Functions
QwtDoubleInterval	log10 (const QwtDoubleInterval &) const
QwtDoubleInterval	pow10 (const QwtDoubleInterval &) const
Protected Member Functions inherited from QwtScaleEngine
QwtDoubleInterval	buildInterval (double v) const
bool	contains (const QwtDoubleInterval &, double val) const
double	divideInterval (double interval, int numSteps) const
QwtValueList	strip (const QwtValueList &, const QwtDoubleInterval &) const

Additional Inherited Members
Public Types inherited from QwtScaleEngine
enum	Attribute {   NoAttribute = 0,   IncludeReference = 1,   Symmetric = 2,   Floating = 4,   Inverted = 8 }

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Detailed Description

A scale engine for logarithmic (base 10) scales.

The step size is measured in decades and the major step size will be adjusted to fit the pattern , where n is a natural number including zero.

Warning:

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

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Member Function Documentation

void QwtLog10ScaleEngine::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.

QwtScaleDiv QwtLog10ScaleEngine::divideScale ( double  x1, double  x2, int  maxMajSteps, int  maxMinSteps, double  stepSize = 0.0  ) const

virtual

Calculate a scale division.

Parameters:

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

See also:

QwtScaleEngine::stepSize(), QwtLog10ScaleEngine::subDivide()

Implements QwtScaleEngine.

QwtDoubleInterval QwtLog10ScaleEngine::log10 ( const QwtDoubleInterval &  interval ) const

protected

Return the interval [log10(interval.minValue(), log10(interval.maxValue]

QwtDoubleInterval QwtLog10ScaleEngine::pow10 ( const QwtDoubleInterval &  interval ) const

protected

Return the interval [pow10(interval.minValue(), pow10(interval.maxValue]

QwtScaleTransformation * QwtLog10ScaleEngine::transformation ( ) const

virtual

Return a transformation, for logarithmic (base 10) scales

Implements QwtScaleEngine.