QwtLinearScaleEngine - Man Page

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

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.

Additional Inherited Members

Detailed Description

A scale engine for linear scales.

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

Constructor & Destructor Documentation

QwtLinearScaleEngine::QwtLinearScaleEngine (uint base = 10)

Constructor

Parameters

base Base of the scale engine

See also

setBase()

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

void QwtLinearScaleEngine::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

setAttribute()

Implements QwtScaleEngine.

Reimplemented in QwtDateScaleEngine.

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

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

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

QwtScaleDiv QwtLinearScaleEngine::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.

Reimplemented in QwtDateScaleEngine.

Author

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Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide