QwtLinearScaleEngine.qt5 - Man Page


#include <qwt_scale_engine.h>

Inherits QwtScaleEngine.

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

Protected Member Functions

QwtDoubleInterval align (const QwtDoubleInterval &, double stepSize) const

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.

Member Function Documentation

QwtDoubleInterval QwtLinearScaleEngine::align (const QwtDoubleInterval &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.


interval Interval
stepSize Step size


Aligned interval

void QwtLinearScaleEngine::autoScale (intmaxNumSteps, double &x1, double &x2, double &stepSize) const [virtual]

Align and divide an interval


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:


Implements QwtScaleEngine.

QwtScaleDiv QwtLinearScaleEngine::divideScale (doublex1, doublex2, intmaxMajSteps, intmaxMinSteps, doublestepSize = 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(), QwtScaleEngine::subDivide()

Implements QwtScaleEngine.

QwtScaleTransformation * QwtLinearScaleEngine::transformation () const [virtual]

Return a transformation, for linear scales

Implements QwtScaleEngine.


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Tue Nov 20 2012 Version 5.2.3 Qwt User's Guide