QwtLog10ScaleEngine Class Reference

Inheritance diagram for QwtLog10ScaleEngine:

[legend]Collaboration diagram for QwtLog10ScaleEngine:

[legend]List of all members.

---

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 , where 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 636 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 693 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 899 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 909 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 621 of file qwt_scale_engine.cpp.

---