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

NAME
       QwtLinearScaleEngine - A scale engine for linear scales.


SYNOPSIS
       #include <qwt_scale_engine.h>

       Inherits QwtScaleEngine.

       Inherited by QwtDateScaleEngine.

   Public Member Functions
       QwtLinearScaleEngine (uint base=10)
       virtual ~QwtLinearScaleEngine ()
           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 linear scales.

       The step size will fit into the pattern $re n is an integer.

       Definition at line 151 of file qwt_scale_engine.h.

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

       Parameters
           base Base of the scale engine

       See also
           setBase()

       Definition at line 511 of file qwt_scale_engine.cpp.

Member Function Documentation
   QwtInterval QwtLinearScaleEngine::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 741 of file qwt_scale_engine.cpp.

   void QwtLinearScaleEngine::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
           setAttribute()

       Implements QwtScaleEngine.

       Reimplemented in QwtDateScaleEngine.

       Definition at line 531 of file qwt_scale_engine.cpp.

   QList< double > QwtLinearScaleEngine::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 664 of file qwt_scale_engine.cpp.

   void QwtLinearScaleEngine::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 692 of file qwt_scale_engine.cpp.

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

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

       See also
           buildMajorTicks(), buildMinorTicks

       Definition at line 627 of file qwt_scale_engine.cpp.

   QwtScaleDiv QwtLinearScaleEngine::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.

       Reimplemented in QwtDateScaleEngine.

       Definition at line 577 of file qwt_scale_engine.cpp.


Author
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Version 6.2.0                   Sun Jul 18 2021        QwtLinearScaleEngine(3)