QwtLog10ScaleEngine (3)

#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 log10 (const QwtDoubleInterval &) const

QwtDoubleInterval pow10 (const QwtDoubleInterval &) const

Additional Inherited Members

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 $\left{ 1,2,3,5\right\} \cdot 10^{n}$, where n is a natural number including zero.

Warning:

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

void QwtLog10ScaleEngine::autoScale (intmaxNumSteps, double &x1, double &x2, double &stepSize) const\fC [virtual]\fP

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.

\fBQwtScaleDiv\fP QwtLog10ScaleEngine::divideScale (doublex1, doublex2, intmaxMajSteps, intmaxMinSteps, doublestepSize = \fC0.0\fP) const\fC [virtual]\fP

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.

\fBQwtDoubleInterval\fP QwtLog10ScaleEngine::log10 (const \fBQwtDoubleInterval\fP &interval) const\fC [protected]\fP

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

\fBQwtDoubleInterval\fP QwtLog10ScaleEngine::pow10 (const \fBQwtDoubleInterval\fP &interval) const\fC [protected]\fP

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

\fBQwtScaleTransformation\fP * QwtLog10ScaleEngine::transformation () const\fC [virtual]\fP

Return a transformation, for logarithmic (base 10) scales

Implements QwtScaleEngine.

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