QwtLog10ScaleEngine(3)

NAME
QwtLog10ScaleEngine - A scale engine for logarithmic (base 10) scales.

SYNOPSIS

#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

Detailed Description

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 $re n is a natural number including zero.

Warning:
    the step size as well as the margins are measured in *decades*.

Member Function Documentation

  void QwtLog10ScaleEngine::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:
    QwtScaleEngine::setAttribute()

Implements QwtScaleEngine.

  QwtScaleDiv QwtLog10ScaleEngine::divideScale (double x1, double x2, int maxMajSteps, int maxMinSteps, double stepSize = 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(), QwtLog10ScaleEngine::subDivide()

Implements QwtScaleEngine.

  QwtDoubleInterval QwtLog10ScaleEngine::log10 (const QwtDoubleInterval & interval) const [protected]

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

  QwtDoubleInterval QwtLog10ScaleEngine::pow10 (const QwtDoubleInterval & interval) const [protected]

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

  QwtScaleTransformation * QwtLog10ScaleEngine::transformation () const [virtual]

Return a transformation, for logarithmic (base 10) scales

Implements QwtScaleEngine.

Author

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