QwtLogScaleEngine - A scale engine for logarithmic scales.

NAME  SYNOPSIS  Public Member Functions  Protected Member Functions  Additional Inherited Members  Detailed Description  Constructor & Destructor Documentation  QwtLogScaleEngine::QwtLogScaleEngine (uint base = 10) [explicit]  QwtLogScaleEngine::˜QwtLogScaleEngine () [virtual]  Member Function Documentation  QwtInterval QwtLogScaleEngine::align (const QwtInterval & interval, doublestepSize) const [protected]  void QwtLogScaleEngine::autoScale (int maxNumSteps, double & x1, double &x2, double & stepSize) const [override], [virtual]  QList< double > QwtLogScaleEngine::buildMajorTicks (const QwtInterval &interval, double stepSize) const [protected]  void QwtLogScaleEngine::buildMinorTicks (const QList< double > &majorTicks, int maxMinorSteps, double stepSize, QList< double > &minorTicks, QList< double > & mediumTicks) const [protected]  void QwtLogScaleEngine::buildTicks (const QwtInterval & interval, doublestepSize, int maxMinorSteps, QList< double >ticks[QwtScaleDiv::NTickTypes]) const [protected]  QwtScaleDiv QwtLogScaleEngine::divideScale (double x1, double x2, intmaxMajorSteps, int maxMinorSteps, double stepSize = 0.0) const[override], [virtual]  Author 

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NAME

QwtLogScaleEngine − A scale engine for logarithmic scales.

SYNOPSIS

#include <qwt_scale_engine.h>

Inherits QwtScaleEngine.

Public Member Functions

QwtLogScaleEngine (uint base=10)
virtual ˜QwtLogScaleEngine ()
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 logarithmic scales.

The step size is measured in decades and the major step size will beight adjusted to fit the pattern $t 1,2,3,5

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 (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 () [virtual]

Destructor.

Definition at line 783 of file qwt_scale_engine.cpp.

Member Function Documentation

QwtInterval QwtLogScaleEngine::align (const QwtInterval & interval, doublestepSize) 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 [override], [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.

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.

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, doublestepSize, 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.

QwtScaleDiv QwtLogScaleEngine::divideScale (double x1, double x2, intmaxMajorSteps, int maxMinorSteps, double stepSize = 0.0) const[override], [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.

Author

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