Qwt User's Guide  6.0.1
Public Member Functions | Protected Member Functions
QwtAbstractScale Class Reference

#include <qwt_abstract_scale.h>

Inheritance diagram for QwtAbstractScale:
Inheritance graph
[legend]

List of all members.

Public Member Functions

bool autoScale () const
 QwtAbstractScale ()
const QwtScaleEnginescaleEngine () const
QwtScaleEnginescaleEngine ()
const QwtScaleMapscaleMap () const
int scaleMaxMajor () const
int scaleMaxMinor () const
void setAutoScale ()
void setScale (double vmin, double vmax, double step=0.0)
void setScale (const QwtInterval &, double step=0.0)
void setScale (const QwtScaleDiv &)
void setScaleEngine (QwtScaleEngine *)
void setScaleMaxMajor (int ticks)
void setScaleMaxMinor (int ticks)
virtual ~QwtAbstractScale ()

Protected Member Functions

const QwtAbstractScaleDrawabstractScaleDraw () const
QwtAbstractScaleDrawabstractScaleDraw ()
void rescale (double vmin, double vmax, double step=0.0)
virtual void scaleChange ()
void setAbstractScaleDraw (QwtAbstractScaleDraw *)

Detailed Description

An abstract base class for classes containing a scale.

QwtAbstractScale is used to provide classes with a QwtScaleDraw, and a QwtScaleDiv. The QwtScaleDiv might be set explicitely or calculated by a QwtScaleEngine.


Constructor & Destructor Documentation

Constructor

Creates a default QwtScaleDraw and a QwtLinearScaleEngine. Autoscaling is enabled, and the stepSize is initialized by 0.0.

Destructor.


Member Function Documentation

Returns:
Scale draw
See also:
setAbstractScaleDraw()
Returns:
Scale draw
See also:
setAbstractScaleDraw()
Returns:
true if autoscaling is enabled
void QwtAbstractScale::rescale ( double  vmin,
double  vmax,
double  stepSize = 0.0 
) [protected]

Recalculate the scale division and update the scale draw.

Parameters:
vminLower limit of the scale interval
vmaxUpper limit of the scale interval
stepSizeMajor step size
See also:
scaleChange()
void QwtAbstractScale::scaleChange ( ) [protected, virtual]

Notify changed scale.

Dummy empty implementation, intended to be overloaded by derived classes

Reimplemented in QwtThermo, and QwtSlider.

Returns:
Scale engine
See also:
setScaleEngine()
Returns:
Scale engine
See also:
setScaleEngine()
Returns:
Max. number of major tick intervals The default value is 5.
Returns:
Max. number of minor tick intervals The default value is 3.

Set a scale draw.

scaleDraw has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setAbstractScaleDraw.

Advise the widget to control the scale range internally.

Autoscaling is on by default.

See also:
setScale(), autoScale()
void QwtAbstractScale::setScale ( double  vmin,
double  vmax,
double  stepSize = 0.0 
)

Specify a scale.

Disable autoscaling and define a scale by an interval and a step size

Parameters:
vminlower limit of the scale interval
vmaxupper limit of the scale interval
stepSizemajor step size
See also:
setAutoScale()
void QwtAbstractScale::setScale ( const QwtInterval interval,
double  stepSize = 0.0 
)

Specify a scale.

Disable autoscaling and define a scale by an interval and a step size

Parameters:
intervalInterval
stepSizemajor step size
See also:
setAutoScale()
void QwtAbstractScale::setScale ( const QwtScaleDiv scaleDiv)

Specify a scale.

Disable autoscaling and define a scale by a scale division

Parameters:
scaleDivScale division
See also:
setAutoScale()

Set a scale engine.

The scale engine is responsible for calculating the scale division, and in case of auto scaling how to align the scale.

scaleEngine has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setScaleEngine.

Set the maximum number of major tick intervals.

The scale's major ticks are calculated automatically such that the number of major intervals does not exceed ticks. The default value is 5.

Parameters:
ticksmaximal number of major ticks.
See also:
QwtAbstractScaleDraw

Set the maximum number of minor tick intervals.

The scale's minor ticks are calculated automatically such that the number of minor intervals does not exceed ticks. The default value is 3.

Parameters:
ticks
See also:
QwtAbstractScaleDraw