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QwtThermo Class Reference

Inheritance diagram for QwtThermo:

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Collaboration diagram for QwtThermo:

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List of all members.

Detailed Description

The Thermometer Widget.

QwtThermo is a widget which displays a value in an interval. It supports:

By default, the scale and range run over the same interval of values. QwtScaleIf::setScale() changes the interval of the scale and allows easy conversion between physical units. The example shows how to make the scale indicate in degrees Fahrenheit and to set the value in degrees Kelvin:

#include <qapplication.h>
#include <qwt_thermo.h>

double Kelvin2Fahrenheit(double kelvin)
{
    // see http://en.wikipedia.org/wiki/Kelvin
    return 1.8*kelvin - 459.67;
}

int main(int argc, char **argv)
{
    const double minKelvin = 0.0;
    const double maxKelvin = 500.0;

    QApplication a(argc, argv);
    QwtThermo t;
    t.setRange(minKelvin, maxKelvin);
    t.setScale(Kelvin2Fahrenheit(minKelvin), Kelvin2Fahrenheit(maxKelvin));
    // set the value in Kelvin but the scale displays in Fahrenheit
    // 273.15 Kelvin = 0 Celsius = 32 Fahrenheit
    t.setValue(273.15);
    a.setMainWidget(&t);
    t.show();
    return a.exec();
}

Todo:
Improve the support for a logarithmic range and/or scale.

Definition at line 67 of file qwt_thermo.h.

Public Types

enum  ScalePos {
  None,
  Left,
  Right,
  Top,
  Bottom
}

Public Slots

void setValue (double val)

Public Member Functions

 QwtThermo (QWidget *parent=0, const char *name=0)
virtual ~QwtThermo ()
void setOrientation (Qt::Orientation o, ScalePos s)
void setScalePosition (ScalePos s)
ScalePos scalePosition () const
void setBorderWidth (int w)
int borderWidth () const
void setFillBrush (const QBrush &b)
const QBrush & fillBrush () const
void setFillColor (const QColor &c)
const QColor & fillColor () const
void setAlarmBrush (const QBrush &b)
const QBrush & alarmBrush () const
void setAlarmColor (const QColor &c)
const QColor & alarmColor () const
void setAlarmLevel (double v)
double alarmLevel () const
void setAlarmEnabled (bool tf)
bool alarmEnabled () const
void setPipeWidth (int w)
int pipeWidth () const
void setMaxValue (double v)
double maxValue () const
void setMinValue (double v)
double minValue () const
double value () const
void setRange (double vmin, double vmax, bool lg=FALSE)
void setMargin (int m)
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
virtual QSizePolicy sizePolicy () const

Protected Member Functions

void draw (QPainter *p, const QRect &update_rect)
void drawThermo (QPainter *p)
void layoutThermo (bool update=TRUE)
virtual void scaleChange ()
virtual void fontChange (const QFont &oldFont)
virtual void paintEvent (QPaintEvent *e)
virtual void resizeEvent (QResizeEvent *e)


Constructor & Destructor Documentation

QwtThermo::QwtThermo QWidget *  parent = 0,
const char *  name = 0
 

Constructor.

Definition at line 20 of file qwt_thermo.cpp.

QwtThermo::~QwtThermo  )  [virtual]
 

Destructor.

Definition at line 27 of file qwt_thermo.cpp.


Member Function Documentation

const QBrush & QwtThermo::alarmBrush  )  const
 

Return the liquid brush above the alarm threshold.

Definition at line 529 of file qwt_thermo.cpp.

const QColor & QwtThermo::alarmColor  )  const
 

Return the liquid color above the alarm threshold.

Definition at line 545 of file qwt_thermo.cpp.

bool QwtThermo::alarmEnabled  )  const
 

Return if the alarm threshold is enabled or disabled.

Definition at line 611 of file qwt_thermo.cpp.

double QwtThermo::alarmLevel  )  const
 

Return the alarm threshold.

Definition at line 559 of file qwt_thermo.cpp.

int QwtThermo::borderWidth  )  const
 

Return the border width of the thermometer pipe.

Definition at line 457 of file qwt_thermo.cpp.

void QwtThermo::draw QPainter *  p,
const QRect &  update_rect
[protected]
 

Draw the whole QwtThermo.

Definition at line 80 of file qwt_thermo.cpp.

References QwtScaleDraw::draw(), drawThermo(), and QwtScaleIf::scaleDraw().

Referenced by paintEvent().

void QwtThermo::drawThermo QPainter *  p  )  [protected]
 

Redraw the liquid in thermometer pipe.

Definition at line 288 of file qwt_thermo.cpp.

References QwtDiMap::limTransform().

Referenced by draw().

const QBrush & QwtThermo::fillBrush  )  const
 

Return the liquid brush.

Definition at line 497 of file qwt_thermo.cpp.

const QColor & QwtThermo::fillColor  )  const
 

Return the liquid color.

Definition at line 513 of file qwt_thermo.cpp.

void QwtThermo::fontChange const QFont &  oldFont  )  [protected, virtual]
 

Notify a font change.

Definition at line 274 of file qwt_thermo.cpp.

References layoutThermo().

void QwtThermo::layoutThermo bool  update_geometry = TRUE  )  [protected]
 

Recalculate the QwtThermo geometry and layout based on the QwtThermo::rect() and the fonts.

Parameters:
update_geometry notify the layout system and call update to redraw the scale

Definition at line 109 of file qwt_thermo.cpp.

References QwtScaleDraw::minBorderDist(), QwtScaleIf::scaleDraw(), QwtScaleDraw::setGeometry(), and QwtDiMap::setIntRange().

Referenced by fontChange(), resizeEvent(), scaleChange(), setBorderWidth(), setOrientation(), setPipeWidth(), and setRange().

double QwtThermo::maxValue  )  const
 

Return the maximum value.

Definition at line 133 of file qwt_thermo.h.

QSize QwtThermo::minimumSizeHint  )  const [virtual]
 

Return a minimum size hint.

Warning:
The return value depends on the font and the scale.
See also:
QwtThermo::sizeHint

Definition at line 652 of file qwt_thermo.cpp.

References QwtScaleDraw::minHeight(), QwtScaleDraw::minWidth(), and QwtScaleIf::scaleDraw().

Referenced by sizeHint().

double QwtThermo::minValue  )  const
 

Return the minimum value.

Definition at line 138 of file qwt_thermo.h.

void QwtThermo::paintEvent QPaintEvent *  e  )  [protected, virtual]
 

Qt paint event.

Definition at line 68 of file qwt_thermo.cpp.

References draw(), and QwtPaintBuffer::painter().

int QwtThermo::pipeWidth  )  const
 

Return the width of the pipe.

Definition at line 575 of file qwt_thermo.cpp.

void QwtThermo::resizeEvent QResizeEvent *  e  )  [protected, virtual]
 

Qt resize event handler.

Definition at line 98 of file qwt_thermo.cpp.

References layoutThermo().

void QwtThermo::scaleChange  )  [protected, virtual]
 

Notify a scale change.

Implements QwtScaleIf.

Definition at line 281 of file qwt_thermo.cpp.

References layoutThermo().

Referenced by setRange().

QwtThermo::ScalePos QwtThermo::scalePosition  )  const
 

Return the scale position.

Definition at line 268 of file qwt_thermo.cpp.

void QwtThermo::setAlarmBrush const QBrush &  b  ) 
 

Specify the liquid brush above the alarm threshold.

Parameters:
c New brush. The default is solid white.

Definition at line 522 of file qwt_thermo.cpp.

void QwtThermo::setAlarmColor const QColor &  c  ) 
 

Specify the liquid color above the alarm threshold.

Parameters:
c New color. The default is white.

Definition at line 538 of file qwt_thermo.cpp.

void QwtThermo::setAlarmEnabled bool  tf  ) 
 

Enable or disable the alarm threshold.

Parameters:
tf TRUE (disabled) or FALSE (enabled)

Definition at line 604 of file qwt_thermo.cpp.

void QwtThermo::setAlarmLevel double  v  ) 
 

Specify the alarm threshold.

Definition at line 551 of file qwt_thermo.cpp.

void QwtThermo::setBorderWidth int  w  ) 
 

Set the border width of the pipe.

Definition at line 446 of file qwt_thermo.cpp.

References layoutThermo().

void QwtThermo::setFillBrush const QBrush &  b  ) 
 

Change the brush of the liquid.

Parameters:
c New brush. The default brush is solid black.

Definition at line 490 of file qwt_thermo.cpp.

void QwtThermo::setFillColor const QColor &  c  ) 
 

Change the color of the liquid.

Parameters:
c New color. The default color is black.

Definition at line 506 of file qwt_thermo.cpp.

void QwtThermo::setMargin int  m  ) 
 

Specify the distance between the pipe's endpoints and the widget's border.

The margin is used to leave some space for the scale labels. If a large font is used, it is advisable to adjust the margins.

Parameters:
m New Margin. The default values are 10 for horizontal orientation and 20 for vertical orientation.
Warning:
The margin has no effect if the scale is disabled.

This function is a NOOP because margins are determined automatically.

Definition at line 595 of file qwt_thermo.cpp.

void QwtThermo::setMaxValue double  v  ) 
 

Set the maximum value.

Definition at line 131 of file qwt_thermo.h.

void QwtThermo::setMinValue double  v  ) 
 

Set the minimum value.

Definition at line 136 of file qwt_thermo.h.

void QwtThermo::setOrientation Qt::Orientation  o,
ScalePos  s
 

Set the thermometer orientation and the scale position.

The scale position None disables the scale.

Parameters:
o orientation. Possible values are Qt::Horizontal and Qt::Vertical. The default value is Qt::Vertical.
s Position of the scale. The default value is None.
A valid combination of scale position and orientation is enforced:
  • a horizontal thermometer can have the scale positions Top, Bottom or None;
  • a vertical thermometer can have the scale positions Left, Right or None;
  • an invalid scale position will default to None.

See also:
QwtThermo::setScalePosition()

Definition at line 220 of file qwt_thermo.cpp.

References layoutThermo().

Referenced by setScalePosition().

void QwtThermo::setPipeWidth int  w  ) 
 

Change the width of the pipe.

Definition at line 565 of file qwt_thermo.cpp.

References layoutThermo().

void QwtThermo::setRange double  vmin,
double  vmax,
bool  logarithmic = FALSE
 

Set the range.

Parameters:
vmin value corresponding lower or left end of the thermometer
vmax value corresponding to the upper or right end of the thermometer
logarithmic logarithmic mapping, TRUE or FALSE

Definition at line 468 of file qwt_thermo.cpp.

References QwtScaleIf::hasUserScale(), layoutThermo(), scaleChange(), QwtScaleDraw::scaleDiv(), QwtScaleIf::scaleDraw(), QwtScaleIf::scaleMaxMajor(), QwtScaleIf::scaleMaxMinor(), QwtDiMap::setDblRange(), and QwtScaleDraw::setScale().

void QwtThermo::setScalePosition ScalePos  s  ) 
 

Change the scale position (and thermometer orientation).

Parameters:
s Position of the scale.
A valid combination of scale position and orientation is enforced:
  • if the new scale position is Left or Right, the scale orientation will become Qt::Vertical;
  • if the new scale position is Bottom or Top, the scale orientation will become Qt::Horizontal;
  • if the new scale position is None, the scale orientation will not change.

See also:
QwtThermo::setOrientation()

Definition at line 257 of file qwt_thermo.cpp.

References setOrientation().

void QwtThermo::setValue double  val  )  [slot]
 

Set the current value.

Definition at line 58 of file qwt_thermo.cpp.

QSize QwtThermo::sizeHint  )  const [virtual]
 

Returns:
the minimum size hint
See also:
QwtThermo::minimumSizeHint

Definition at line 642 of file qwt_thermo.cpp.

References minimumSizeHint().

QSizePolicy QwtThermo::sizePolicy  )  const [virtual]
 

Returns:
Fixed/MinimumExpanding for vertical, MinimumExpanding/Fixed for horizontal thermos.

Definition at line 621 of file qwt_thermo.cpp.

References QwtScaleDraw::orientation(), and QwtScaleIf::scaleDraw().

double QwtThermo::value  )  const
 

Return the value.

Definition at line 141 of file qwt_thermo.h.


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