QwtThermo(3)

NAME
QwtThermo - The Thermometer Widget.

SYNOPSIS

#include <qwt_thermo.h>

Inherits QwtAbstractScale.

  Public Types
enum ScalePosition { NoScale, LeadingScale, TrailingScale }
enum OriginMode { OriginMinimum, OriginMaximum, OriginCustom }

  Public Slots
virtual void setValue (double val)

  Public Member Functions
QwtThermo (QWidget *parent=NULL)
virtual ~QwtThermo ()
Destructor.
void setOrientation (Qt::Orientation)
Set the orientation.
Qt::Orientation orientation () const
void setScalePosition (ScalePosition)
Change the position of the scale.
ScalePosition scalePosition () const
void setSpacing (int)
Change the spacing between pipe and scale.
int spacing () const
void setBorderWidth (int w)
int borderWidth () const
void setOriginMode (OriginMode)
Change how the origin is determined.
OriginMode originMode () const
void setOrigin (double)
Specifies the custom origin.
double origin () const
void setFillBrush (const QBrush &b)
Change the brush of the liquid.
QBrush fillBrush () const
void setAlarmBrush (const QBrush &b)
Specify the liquid brush above the alarm threshold.
QBrush alarmBrush () const
void setAlarmLevel (double v)
double alarmLevel () const
void setAlarmEnabled (bool tf)
Enable or disable the alarm threshold.
bool alarmEnabled () const
void setColorMap (QwtColorMap *)
Assign a color map for the fill color.
QwtColorMap * colorMap ()
const QwtColorMap * colorMap () const
void setPipeWidth (int w)
int pipeWidth () const
void setRangeFlags (QwtInterval::BorderFlags)
Exclude/Include min/max values.
QwtInterval::BorderFlags rangeFlags () const
double value () const
Return the value.
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
void setScaleDraw (QwtScaleDraw *)
Set a scale draw.
const QwtScaleDraw * scaleDraw () const

  Protected Member Functions
virtual void drawLiquid (QPainter *, const QRect &) const
virtual void scaleChange ()
Notify a scale change.
virtual void paintEvent (QPaintEvent *)
virtual void resizeEvent (QResizeEvent *)
virtual void changeEvent (QEvent *)
QwtScaleDraw * scaleDraw ()
QRect pipeRect () const
QRect fillRect (const QRect &) const
Calculate the filled rectangle of the pipe.
QRect alarmRect (const QRect &) const
Calculate the alarm rectangle of the pipe.

Detailed Description

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

•   a horizontal or vertical layout;

•   a range;

•   a scale;

•   an alarm level.

The fill colors might be calculated from an optional color map If no color map has been assigned QwtThermo uses the following colors/brushes from the widget palette:

•   QPalette::Base Background of the pipe

•   QPalette::ButtonText Fill brush below the alarm level

•   QPalette::Highlight Fill brush for the values above the alarm level

•   QPalette::WindowText For the axis of the scale

•   QPalette::Text For the labels of the scale

Member Enumeration Documentation

  enum QwtThermo::OriginMode
Origin mode. This property specifies where the beginning of the liquid is placed.

See also:
    setOriginMode(), setOrigin()

Enumerator

OriginMinimum
    The origin is the minimum of the scale.

OriginMaximum
    The origin is the maximum of the scale.

OriginCustom
    The origin is specified using the origin() property.

  enum QwtThermo::ScalePosition
Position of the scale

See also:
    setScalePosition(), setOrientation()

Enumerator

NoScale
    The slider has no scale.

LeadingScale
    The scale is right of a vertical or below of a horizontal slider.

TrailingScale
    The scale is left of a vertical or above of a horizontal slider.

Constructor & Destructor Documentation

  QwtThermo::QwtThermo (QWidget * parent = NULL) [explicit]
Constructor

Parameters:
    parent Parent widget

Member Function Documentation

  QBrush QwtThermo::alarmBrush () const

Returns:
    Liquid brush ( QPalette::Highlight ) above the alarm threshold.

See also:
    setAlarmBrush(), QWidget::palette()

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  bool QwtThermo::alarmEnabled () const

Returns:
    True, when the alarm threshold is enabled.

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  double QwtThermo::alarmLevel () const

Returns:
    Alarm threshold.

See also:
    setAlarmLevel()

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  QRect QwtThermo::alarmRect (const QRect & fillRect) const [protected]

Calculate the alarm rectangle of the pipe.

Parameters:
    fillRect Filled rectangle in the pipe

Returns:
    Rectangle to be filled with the alarm brush

See also:
    pipeRect(), fillRect(), alarmLevel(), alarmBrush()

  int QwtThermo::borderWidth () const

Returns:
    Border width of the thermometer pipe.

See also:
    setBorderWidth()

  void QwtThermo::changeEvent (QEvent * event) [protected], [virtual]
Qt change event handler

Parameters:
    event Event

  QwtColorMap * QwtThermo::colorMap ()

Returns:
    Color map for the fill color

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  const QwtColorMap * QwtThermo::colorMap () const

Returns:
    Color map for the fill color

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  void QwtThermo::drawLiquid (QPainter * painter, const QRect & pipeRect) const [protected], [virtual]
Redraw the liquid in thermometer pipe.

Parameters:
    painter Painter
    pipeRect Bounding rectangle of the pipe without borders

  QBrush QwtThermo::fillBrush () const

Returns:
    Liquid ( QPalette::ButtonText ) brush.

See also:
    setFillBrush(), QWidget::palette()

  QRect QwtThermo::fillRect (const QRect & pipeRect) const [protected]

Calculate the filled rectangle of the pipe.

Parameters:
    pipeRect Rectangle of the pipe

Returns:
    Rectangle to be filled ( fill and alarm brush )

See also:
    pipeRect(), alarmRect()

  QSize QwtThermo::minimumSizeHint () const [virtual]

Returns:
    Minimum size hint

Warning:
    The return value depends on the font and the scale.

See also:
    sizeHint()

  Qt::Orientation QwtThermo::orientation () const

Returns:
    Orientation

See also:
    setOrientation()

  double QwtThermo::origin () const

Returns:
    Origin of the thermo, when OriginCustom is enabled

See also:
    setOrigin(), setOriginMode(), originMode()

  QwtThermo::OriginMode QwtThermo::originMode () const

Returns:
    Mode, how the origin is determined.

See also:
    setOriginMode(), serOrigin(), origin()

  void QwtThermo::paintEvent (QPaintEvent * event) [protected], [virtual]
Paint event handler

Parameters:
    event Paint event

  QRect QwtThermo::pipeRect () const [protected]

Returns:
    Bounding rectangle of the pipe ( without borders ) in widget coordinates

  int QwtThermo::pipeWidth () const

Returns:
    Width of the pipe.

See also:
    setPipeWidth()

  QwtInterval::BorderFlags QwtThermo::rangeFlags () const

Returns:
    Range flags

See also:
    setRangeFlags()

  void QwtThermo::resizeEvent (QResizeEvent * event) [protected], [virtual]
Resize event handler

Parameters:
    event Resize event

  const QwtScaleDraw * QwtThermo::scaleDraw () const

Returns:
    the scale draw of the thermo

See also:
    setScaleDraw()

  QwtScaleDraw * QwtThermo::scaleDraw () [protected]

Returns:
    the scale draw of the thermo

See also:
    setScaleDraw()

  QwtThermo::ScalePosition QwtThermo::scalePosition () const

Returns:
    Scale position.

See also:
    setScalePosition()

  void QwtThermo::setAlarmBrush (const QBrush & brush)

Specify the liquid brush above the alarm threshold. Changes the QPalette::Highlight brush of the palette.

Parameters:
    brush New brush.

See also:
    alarmBrush(), QWidget::setPalette()

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  void QwtThermo::setAlarmEnabled (bool on)

Enable or disable the alarm threshold.

Parameters:
    on true (disabled) or false (enabled)

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  void QwtThermo::setAlarmLevel (double level)
Specify the alarm threshold.

Parameters:
    level Alarm threshold

See also:
    alarmLevel()

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  void QwtThermo::setBorderWidth (int width)
Set the border width of the pipe.

Parameters:
    width Border width

See also:
    borderWidth()

  void QwtThermo::setColorMap (QwtColorMap * colorMap)

Assign a color map for the fill color.

Parameters:
    colorMap Color map

Warning:
    The alarm threshold has no effect, when a color map has been assigned

  void QwtThermo::setFillBrush (const QBrush & brush)

Change the brush of the liquid. Changes the QPalette::ButtonText brush of the palette.

Parameters:
    brush New brush.

See also:
    fillBrush(), QWidget::setPalette()

  void QwtThermo::setOrientation (Qt::Orientation orientation)

Set the orientation.

Parameters:
    orientation Allowed values are Qt::Horizontal and Qt::Vertical.

See also:
    orientation(), scalePosition()

  void QwtThermo::setOrigin (double origin)

Specifies the custom origin. If originMode is set to OriginCustom this property controls where the liquid starts.

Parameters:
    origin New origin level

See also:
    setOriginMode(), originMode(), origin()

  void QwtThermo::setOriginMode (OriginMode m)

Change how the origin is determined.

See also:
    originMode(), serOrigin(), origin()

  void QwtThermo::setPipeWidth (int width)
Change the width of the pipe.

Parameters:
    width Width of the pipe

See also:
    pipeWidth()

  void QwtThermo::setRangeFlags (QwtInterval::BorderFlags flags)

Exclude/Include min/max values. According to the flags minValue() and maxValue() are included/excluded from the pipe. In case of an excluded value the corresponding tick is painted 1 pixel off of the pipeRect().

F.e. when a minimum of 0.0 has to be displayed as an empty pipe the minValue() needs to be excluded.

Parameters:
    flags Range flags

See also:
    rangeFlags()

  void QwtThermo::setScaleDraw (QwtScaleDraw * scaleDraw)

Set a scale draw. For changing the labels of the scales, it is necessary to derive from QwtScaleDraw and overload QwtScaleDraw::label().

Parameters:
    scaleDraw ScaleDraw object, that has to be created with new and will be deleted in ~QwtThermo() or the next call of setScaleDraw().

  void QwtThermo::setScalePosition (ScalePosition scalePosition)

Change the position of the scale.

Parameters:
    scalePosition Position of the scale.

See also:
    ScalePosition, scalePosition()

  void QwtThermo::setSpacing (int spacing)

Change the spacing between pipe and scale. A spacing of 0 means, that the backbone of the scale is below the pipe.

The default setting is 3 pixels.

Parameters:
    spacing Number of pixels

See also:
    spacing();

  void QwtThermo::setValue (double value) [virtual], [slot]
Set the current value.

Parameters:
    value New Value

See also:
    value()

  QSize QwtThermo::sizeHint () const [virtual]

Returns:
    the minimum size hint

See also:
    minimumSizeHint()

  int QwtThermo::spacing () const

Returns:
    Number of pixels between pipe and scale

See also:
    setSpacing()

Author

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