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QwtScaleIf Class Reference

Inheritance diagram for QwtScaleIf:

QwtKnob QwtSlider QwtThermo List of all members.

Detailed Description

An interface class for widgets containing a scale.

This interface class is used to provide classes a QwtScaleDraw and an interface to access that scale.


Public Member Functions

 QwtScaleIf ()
virtual ~QwtScaleIf ()
void setScale (double vmin, double vmax, int logarithmic=0)
void setScale (double vmin, double vmax, double step, int logarithmic=0)
void setScale (const QwtScaleDiv &s)
void setScaleMaxMajor (int ticks)
void setScaleMaxMinor (int ticks)
void autoScale ()
int scaleMaxMinor () const
int scaleMaxMajor () const
void setScaleDraw (QwtScaleDraw *)
const QwtScaleDrawscaleDraw () const

Protected Member Functions

bool hasUserScale ()
virtual void scaleChange ()=0
QwtScaleDrawscaleDraw ()


Constructor & Destructor Documentation

QwtScaleIf::QwtScaleIf  ) 
 

Constructor.

QwtScaleIf::~QwtScaleIf  )  [virtual]
 

Destructor.


Member Function Documentation

void QwtScaleIf::autoScale  ) 
 

Advise the widget to control the scale range internally.

Autoscaling is on by default.

See also:
QwtScaleIf::setScale()

bool QwtScaleIf::hasUserScale  )  [protected]
 

Check for user-defined scale.

virtual void QwtScaleIf::scaleChange  )  [protected, pure virtual]
 

Notify changed scale.

Implemented in QwtSlider, and QwtThermo.

QwtScaleDraw * QwtScaleIf::scaleDraw  )  [protected]
 

Returns:
scale draw
See also:
QwtScaleIf::setScaleDraw

const QwtScaleDraw * QwtScaleIf::scaleDraw  )  const
 

Returns:
scale draw
See also:
QwtScaleIf::setScaleDraw

int QwtScaleIf::scaleMaxMajor  )  const
 

Returns:
max. number of major tick intervals

int QwtScaleIf::scaleMaxMinor  )  const
 

Returns:
max. number of minor tick intervals

void QwtScaleIf::setScale const QwtScaleDiv s  ) 
 

Assign a user-defined scale division

Parameters:
s scale division

void QwtScaleIf::setScale double  vmin,
double  vmax,
double  step,
int  logarithmic = 0
 

Specify a user-defined scale.

By default, the widget is supposed to control the range of its scale automatically, but sometimes it is desirable to have a user-defined scale which is not in sync with the widget's range, e.g. if a logarithmic scale is needed (sliders don't support that) or if the scale is required to have a fixed range (say 0...100%), independent of the widget's range.

Parameters:
vmin 
vmax interval boundaries
step major step size
logarithmic If != 0, build a logarithmic scale
See also:
QwtScaleIf::autoScale()

void QwtScaleIf::setScale double  vmin,
double  vmax,
int  logarithmic = 0
 

Specify a user-defined scale.

By default, the widget is supposed to control the range of its scale automatically, but sometimes it is desirable to have a user-defined scale which is not in sync with the widget's range, e.g. if a logarithmic scale is needed (sliders don't support that) or if the scale is required to have a fixed range (say 0...100%), independent of the widget's range.

Parameters:
vmin 
vmax boundary values
logarithmic If != 0, Build a logarithmic scale
See also:
QwtScaleIf::autoScale()

void QwtScaleIf::setScaleDraw QwtScaleDraw sd  ) 
 

Set a scale draw sd has to be created with new and will be deleted in QwtScaleIf::~QwtScaleIf or the next call of QwtScaleIf::setScaleDraw.

void QwtScaleIf::setScaleMaxMajor int  ticks  ) 
 

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:
ticks maximal number of major ticks.
See also:
QwtScaleDraw

void QwtScaleIf::setScaleMaxMinor int  ticks  ) 
 

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:
QwtScaleDraw


Generated on Tue Nov 25 21:15:09 2003 for Qwt User's Guide by doxygen 1.3.4