QwtLogScaleEngine(3)           Qwt User's Guide           QwtLogScaleEngine(3)

NAME
       QwtLogScaleEngine - A scale engine for logarithmic scales.


SYNOPSIS
       #include <qwt_scale_engine.h>

       Inherits QwtScaleEngine.

   Public Member Functions
       QwtLogScaleEngine (uint base=10)
       virtual ~QwtLogScaleEngine ()
           Destructor.
       virtual void autoScale (int maxNumSteps, double &x1, double &x2, double
           &stepSize) const override
       virtual QwtScaleDiv divideScale (double x1, double x2, int
           maxMajorSteps, int maxMinorSteps, double stepSize=0.0) const
           override
           Calculate a scale division for an interval.

   Protected Member Functions
       QwtInterval align (const QwtInterval &, double stepSize) const
           Align an interval to a step size.
       void buildTicks (const QwtInterval &, double stepSize, int
           maxMinorSteps, QList< double > ticks[QwtScaleDiv::NTickTypes])
           const
           Calculate ticks for an interval.
       QList< double > buildMajorTicks (const QwtInterval &interval, double
           stepSize) const
           Calculate major ticks for an interval.
       void buildMinorTicks (const QList< double > &majorTicks, int
           maxMinorSteps, double stepSize, QList< double > &minorTicks, QList<
           double > &mediumTicks) const
           Calculate minor/medium ticks for major ticks.

   Additional Inherited Members

Detailed Description
       A scale engine for logarithmic 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 191 of file qwt_scale_engine.h.

Constructor & Destructor Documentation
   QwtLogScaleEngine::QwtLogScaleEngine (uint base = 10) [explicit]
       Constructor

       Parameters
           base Base of the scale engine

       See also
           setBase()

       Definition at line 776 of file qwt_scale_engine.cpp.

Member Function Documentation
   QwtInterval QwtLogScaleEngine::align (const QwtInterval & 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 1106 of file qwt_scale_engine.cpp.

   void QwtLogScaleEngine::autoScale (int maxNumSteps, double & x1, double &
       x2, double & stepSize) const [override],  [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 797 of file qwt_scale_engine.cpp.

   QList< double > QwtLogScaleEngine::buildMajorTicks (const QwtInterval &
       interval, double stepSize) const [protected]
       Calculate major ticks for an interval.

       Parameters
           interval Interval
           stepSize Step size

       Returns
           Calculated ticks

       Definition at line 967 of file qwt_scale_engine.cpp.

   void QwtLogScaleEngine::buildMinorTicks (const QList< double > &
       majorTicks, int maxMinorSteps, double stepSize, QList< double > &
       minorTicks, QList< double > & mediumTicks) const [protected]
       Calculate minor/medium ticks for major ticks.

       Parameters
           majorTicks Major ticks
           maxMinorSteps Maximum number of minor steps
           stepSize Step size
           minorTicks Array to be filled with the calculated minor ticks
           mediumTicks Array to be filled with the calculated medium ticks

       Definition at line 1002 of file qwt_scale_engine.cpp.

   void QwtLogScaleEngine::buildTicks (const QwtInterval & interval, double
       stepSize, int maxMinorSteps, QList< double >
       ticks[QwtScaleDiv::NTickTypes]) const [protected]
       Calculate ticks for an interval.

       Parameters
           interval Interval
           maxMinorSteps Maximum number of minor steps
           stepSize Step size
           ticks Arrays to be filled with the calculated ticks

       See also
           buildMajorTicks(), buildMinorTicks

       Definition at line 940 of file qwt_scale_engine.cpp.

   QwtScaleDiv QwtLogScaleEngine::divideScale (double x1, double x2, int
       maxMajorSteps, int maxMinorSteps, double stepSize = 0.0) const
       [override],  [virtual]
       Calculate a scale division for an interval.

       Parameters
           x1 First interval limit
           x2 Second interval limit
           maxMajorSteps Maximum for the number of major steps
           maxMinorSteps Maximum number of minor steps
           stepSize Step size. If stepSize == 0, the engine calculates one.

       Returns
           Calculated scale division

       Implements QwtScaleEngine.

       Definition at line 879 of file qwt_scale_engine.cpp.


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

Version 6.2.0                   Sun Jul 18 2021           QwtLogScaleEngine(3)