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QwtLinearScaleEngine

NAME

QwtLinearScaleEngine -

SYNOPSIS

Inherits QwtScaleEngine.

Detailed Description

A scale engine for linear scales.

The step size will fit into the pattern $

---

re 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

Member Function Documentation

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 416 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 461 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 401 of file qwt_scale_engine.cpp.

Referenced by QwtDial::updateScale().

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 600 of file qwt_scale_engine.cpp.

References QwtScaleArithmetic::ceilEps(), QwtScaleArithmetic::floorEps(), QwtDoubleInterval::maxValue(), and QwtDoubleInterval::minValue().

Referenced by autoScale().

Author

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