QwtLinearScaleEngine Class Reference

Inheritance diagram for QwtLinearScaleEngine:

[legend]Collaboration diagram for QwtLinearScaleEngine:

[legend]List of all members.

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Detailed Description

A scale engine for linear scales.

The step size will fit into the pattern , where n is an integer.

Definition at line 126 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	align (const QwtDoubleInterval &, double stepSize) const

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Member Function Documentation

QwtDoubleInterval QwtLinearScaleEngine::align (  const QwtDoubleInterval &  interval, double  stepSize )  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. Parameters: interval  Interval stepSize  Step size Returns: Aligned interval Definition at line 607 of file qwt_scale_engine.cpp. References QwtScaleArithmetic::ceilEps(), QwtScaleArithmetic::floorEps(), QwtDoubleInterval::maxValue(), and QwtDoubleInterval::minValue(). Referenced by autoScale().

void QwtLinearScaleEngine::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: QwtLinearScaleEngine::setAttribute Implements QwtScaleEngine. Definition at line 423 of file qwt_scale_engine.cpp. References align(), QwtScaleEngine::buildInterval(), QwtScaleEngine::divideInterval(), QwtDoubleInterval::extend(), QwtScaleEngine::hiMargin(), QwtScaleEngine::loMargin(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), QwtDoubleInterval::normalized(), QwtScaleEngine::reference(), QwtDoubleInterval::setMaxValue(), QwtDoubleInterval::setMinValue(), QwtDoubleInterval::symmetrize(), QwtScaleEngine::testAttribute(), and QwtDoubleInterval::width().

QwtScaleDiv QwtLinearScaleEngine::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, QwtScaleEngine::subDivide Implements QwtScaleEngine. Definition at line 468 of file qwt_scale_engine.cpp. References QwtScaleEngine::divideInterval(), and QwtDoubleInterval::width(). Referenced by QwtLog10ScaleEngine::divideScale(), and QwtDial::updateScale().

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

Return a transformation, for linear scales Implements QwtScaleEngine. Definition at line 408 of file qwt_scale_engine.cpp. Referenced by QwtDial::updateScale().

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