Public Types¶

enum Attribute { NoAttribute = 0x00, IncludeReference = 0x01, Symmetric = 0x02, Floating = 0x04, Inverted = 0x08 }
typedef QFlags< Attribute > Attributes

Public Member Functions¶

QwtScaleEngine (uint base=10)
virtual ~QwtScaleEngine ()
Destructor. void setBase (uint base)
uint base () const
void setAttribute (Attribute, bool on=true)
bool testAttribute (Attribute) const
void setAttributes (Attributes)
Attributes attributes () const
void setReference (double)
Specify a reference point. double reference () const
void setMargins (double lower, double upper)
Specify margins at the scale's endpoints. double lowerMargin () const
double upperMargin () const
virtual void autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const =0
virtual QwtScaleDiv divideScale (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize=0.0) const =0
Calculate a scale division. void setTransformation (QwtTransform *)
QwtTransform * transformation () const

Protected Member Functions¶

bool contains (const QwtInterval &, double value) const
QList< double > strip (const QList< double > &, const QwtInterval &) const
double divideInterval (double intervalSize, int numSteps) const
QwtInterval buildInterval (double value) const
Build an interval around a value.

typedef QFlags<Attribute > QwtScaleEngine::Attributes¶

An ORed combination of Attribute values.

Definition at line 78 of file qwt_scale_engine.h.

enum QwtScaleEngine::Attribute¶

Layout attributes

See also

Enumerator

NoAttribute

No attributes.

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.

Definition at line 54 of file qwt_scale_engine.h.

QwtScaleEngine::QwtScaleEngine (uint base = 10) [explicit]¶

Constructor

Parameters

See also

Definition at line 222 of file qwt_scale_engine.cpp.

QwtScaleEngine::Attributes QwtScaleEngine::attributes () const¶

Returns

See also

Definition at line 451 of file qwt_scale_engine.cpp.

virtual void QwtScaleEngine::autoScale (int maxNumSteps, double & x1, double & x2, double & stepSize) const [pure virtual]¶

Align and divide an interval

Parameters

Implemented in QwtLogScaleEngine, QwtLinearScaleEngine, and QwtDateScaleEngine.

uint QwtScaleEngine::base () const¶

Returns

See also

Definition at line 500 of file qwt_scale_engine.cpp.

QwtInterval QwtScaleEngine::buildInterval (double value) const [protected]¶

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

Parameters

Returns

Definition at line 395 of file qwt_scale_engine.cpp.

bool QwtScaleEngine::contains (const QwtInterval & interval, double value) const [protected]¶

Check if an interval 'contains' a value

Parameters

Returns

Definition at line 341 of file qwt_scale_engine.cpp.

double QwtScaleEngine::divideInterval (double intervalSize, int numSteps) const [protected]¶

Calculate a step size for an interval size

Parameters

Returns

Definition at line 326 of file qwt_scale_engine.cpp.

virtual QwtScaleDiv QwtScaleEngine::divideScale (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize = 0.0) const [pure virtual]¶

Calculate a scale division.

Parameters

Returns

Implemented in QwtLogScaleEngine, QwtLinearScaleEngine, and QwtDateScaleEngine.

double QwtScaleEngine::lowerMargin () const¶

Returns

See also

Definition at line 280 of file qwt_scale_engine.cpp.

double QwtScaleEngine::reference () const¶

Returns

See also

Definition at line 474 of file qwt_scale_engine.cpp.

void QwtScaleEngine::setAttribute (Attribute attribute, bool on = true)¶

Change a scale attribute

Parameters

See also

Definition at line 417 of file qwt_scale_engine.cpp.

void QwtScaleEngine::setAttributes (Attributes attributes)¶

Change the scale attribute

Parameters

See also

Definition at line 442 of file qwt_scale_engine.cpp.

void QwtScaleEngine::setBase (uint base)¶

Set the base of the scale engine

While a base of 10 is what 99.9% of all applications need certain scales might need a different base: f.e 2

The default setting is 10

Parameters

See also

Definition at line 491 of file qwt_scale_engine.cpp.

void QwtScaleEngine::setMargins (double lower, double upper)¶

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

Definition at line 312 of file qwt_scale_engine.cpp.

void QwtScaleEngine::setReference (double reference)¶

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

Definition at line 465 of file qwt_scale_engine.cpp.

void QwtScaleEngine::setTransformation (QwtTransform * transform)¶

Assign a transformation

Parameters

The transformation object is used as factory for clones that are returned by transformation()

The scale engine takes ownership of the transformation.

See also

Definition at line 248 of file qwt_scale_engine.cpp.

QList< double > QwtScaleEngine::strip (const QList< double > & ticks, const QwtInterval & interval) const [protected]¶

Remove ticks from a list, that are not inside an interval

Parameters

Returns

Definition at line 364 of file qwt_scale_engine.cpp.

bool QwtScaleEngine::testAttribute (Attribute attribute) const¶

Returns

Parameters

See also

Definition at line 431 of file qwt_scale_engine.cpp.

QwtTransform * QwtScaleEngine::transformation () const¶

Create and return a clone of the transformation of the engine. When the engine has no special transformation NULL is returned, indicating no transformation.

Returns

See also

Definition at line 265 of file qwt_scale_engine.cpp.

double QwtScaleEngine::upperMargin () const¶

Returns

See also

Definition at line 291 of file qwt_scale_engine.cpp.