Linux Certif

Toute la documentation sur la certification Linux LPI

QwtLog10ScaleEngine

NAME

QwtLog10ScaleEngine -

SYNOPSIS

Inherits QwtScaleEngine.

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*.

Definition at line 167 of file qwt_scale_engine.h.

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

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.

Definition at line 629 of file qwt_scale_engine.cpp.

References QwtScaleEngine::buildInterval(), QwtScaleEngine::divideInterval(), QwtDoubleInterval::extend(), QwtScaleEngine::hiMargin(), QwtDoubleInterval::limited(), log10(), QwtScaleEngine::loMargin(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), QwtScaleEngine::reference(), QwtDoubleInterval::setInterval(), QwtScaleEngine::testAttribute(), and QwtDoubleInterval::width().

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.

Definition at line 686 of file qwt_scale_engine.cpp.

References QwtScaleEngine::attributes(), QwtScaleEngine::divideInterval(), QwtLinearScaleEngine::divideScale(), QwtScaleEngine::hiMargin(), QwtScaleDiv::invert(), QwtDoubleInterval::limited(), log10(), QwtScaleEngine::loMargin(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), QwtDoubleInterval::normalized(), QwtScaleEngine::reference(), QwtScaleEngine::setAttributes(), QwtScaleEngine::setMargins(), QwtScaleEngine::setReference(), and QwtDoubleInterval::width().

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

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

Definition at line 892 of file qwt_scale_engine.cpp.

References QwtDoubleInterval::maxValue(), and QwtDoubleInterval::minValue().

Referenced by autoScale(), and divideScale().

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

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

Definition at line 902 of file qwt_scale_engine.cpp.

References QwtDoubleInterval::maxValue(), and QwtDoubleInterval::minValue().

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

Return a transformation, for logarithmic (base 10) scales

Implements QwtScaleEngine.

Definition at line 614 of file qwt_scale_engine.cpp.

Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.