QwtLinearScaleEngine - A scale engine for linear scales.

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

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NAME

QwtLinearScaleEngine − A scale engine for linear scales.

SYNOPSIS

#include <qwt_scale_engine.h>

Inherits QwtScaleEngine.

Inherited by QwtDateScaleEngine.

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. ight

The step size will fit into the pattern $t 1,2,5

Definition at line 151 of file qwt_scale_engine.h.

Constructor & Destructor Documentation

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 () [virtual]

Destructor.

Definition at line 517 of file qwt_scale_engine.cpp.

Member Function Documentation

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.

void QwtLinearScaleEngine::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

setAttribute()

Implements QwtScaleEngine.

Reimplemented in QwtDateScaleEngine.

Definition at line 531 of file qwt_scale_engine.cpp.

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.

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.

void QwtLinearScaleEngine::buildTicks (const QwtInterval & interval, doublestepSize, 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.

QwtScaleDiv QwtLinearScaleEngine::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.

Reimplemented in QwtDateScaleEngine.

Definition at line 577 of file qwt_scale_engine.cpp.

Author

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