NAME¶

QwtLinearScaleEngine - A scale engine for linear scales.

SYNOPSIS¶

#include <qwt_scale_engine.h> Inherits QwtScaleEngine.

Public Types¶

enum Attribute { NoAttribute = 0, IncludeReference = 1, Symmetric = 2, Floating = 4, Inverted = 8 }

Public Member Functions¶

int attributes () const 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 double lowerMargin () const double reference () const void setAttribute (Attribute, bool on=true) void setAttributes (int) void setMargins (double lower, double upper) void setReference (double reference) bool testAttribute (Attribute) const virtual QwtScaleTransformation * transformation () const double upperMargin () const

Protected Member Functions¶

QwtDoubleInterval align (const QwtDoubleInterval &, double stepSize) const QwtDoubleInterval buildInterval (double v) const bool contains (const QwtDoubleInterval &, double val) const double divideInterval (double interval, int numSteps) const QwtValueList strip (const QwtValueList &, const QwtDoubleInterval &) const

Detailed Description¶

A scale engine for linear scales. The step size will fit into the pattern $re n is an integer.

Member Enumeration Documentation¶

enum QwtScaleEngine::Attribute [inherited] .IP • 2¶

IncludeReference
Build a scale which includes the reference() value.

•

Symmetric

 

Build a scale which is symmetric to the reference() value.

•

Floating

 

The endpoints of the scale are supposed to be equal the outmost included values plus the specified margins (see setMargins()). If this attribute is *not* set, the endpoints of the scale will be integer multiples of the step size.

•

Inverted

 

Turn the scale upside down.

See also:

Member Function Documentation¶

QwtDoubleInterval QwtLinearScaleEngine::align (const QwtDoubleInterval &interval, doublestepSize) 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: Returns:

int QwtScaleEngine::attributes () const [inherited] Return the scale attributes¶

See also:

void QwtLinearScaleEngine::autoScale (intmaxNumSteps, double &x1, double &x2, double &stepSize) const [virtual] Align and divide an interval¶

Parameters: See also: Implements QwtScaleEngine.

QwtDoubleInterval QwtScaleEngine::buildInterval (doublev) const [protected, inherited]¶

Build an interval for a value. In case of v == 0.0 the interval is [-0.5, 0.5], otherwide it is [0.5 * v, 1.5 * v]

bool QwtScaleEngine::contains (const QwtDoubleInterval &interval, doublevalue) const [protected, inherited] Check if an interval 'contains' a value¶

Parameters: See also:

double QwtScaleEngine::divideInterval (doubleintervalSize, intnumSteps) const [protected, inherited] Calculate a step size for an interval size¶

Parameters: Returns:

QwtScaleDiv QwtLinearScaleEngine::divideScale (doublex1, doublex2, intmaxMajSteps, intmaxMinSteps, doublestepSize = 0.0) const [virtual]¶

Calculate a scale division. Parameters: See also: Implements QwtScaleEngine.

double QwtScaleEngine::lowerMargin () const [inherited] Returns:¶

See also:

double QwtScaleEngine::reference () const [inherited] Returns:¶

See also:

void QwtScaleEngine::setAttribute (Attributeattribute, boolon = true) [inherited] Change a scale attribute¶

Parameters: See also:

void QwtScaleEngine::setAttributes (intattributes) [inherited] Change the scale attribute¶

Parameters: See also:

void QwtScaleEngine::setMargins (doublelower, doubleupper) [inherited]¶

Specify margins at the scale's endpoints. Parameters: Margins can be used to leave a minimum amount of space between the enclosed intervals and the boundaries of the scale. Warning: See also:

void QwtScaleEngine::setReference (doubler) [inherited]¶

Specify a reference point. Parameters: The reference point is needed if options IncludeReference or Symmetric are active. Its default value is 0.0. See also:

QwtValueList QwtScaleEngine::strip (const QwtValueList &ticks, const QwtDoubleInterval &interval) const [protected, inherited] Remove ticks from a list, that are not inside an interval¶

Parameters: Returns:

bool QwtScaleEngine::testAttribute (Attributeattribute) const [inherited] Check if a attribute is set.¶

Parameters: See also:

QwtScaleTransformation * QwtLinearScaleEngine::transformation () const [virtual] Return a transformation, for linear scales¶

Implements QwtScaleEngine.

double QwtScaleEngine::upperMargin () const [inherited] Returns:¶

See also:

Author¶

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