Qwt User's Guide 5.2.2
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The Thermometer Widget. More...
#include <qwt_thermo.h>
Public Types | |
enum | ScalePos { NoScale, LeftScale, RightScale, TopScale, BottomScale } |
Public Slots | |
void | setValue (double val) |
Public Member Functions | |
const QBrush & | alarmBrush () const |
const QColor & | alarmColor () const |
bool | alarmEnabled () const |
double | alarmLevel () const |
bool | autoScale () const |
int | borderWidth () const |
const QBrush & | fillBrush () const |
const QColor & | fillColor () const |
double | maxValue () const |
virtual QSize | minimumSizeHint () const |
double | minValue () const |
int | pipeWidth () const |
QwtThermo (QWidget *parent=NULL) | |
const QwtScaleDraw * | scaleDraw () const |
const QwtScaleEngine * | scaleEngine () const |
QwtScaleEngine * | scaleEngine () |
const QwtScaleMap & | scaleMap () const |
int | scaleMaxMajor () const |
int | scaleMaxMinor () const |
ScalePos | scalePosition () const |
void | setAlarmBrush (const QBrush &b) |
void | setAlarmColor (const QColor &c) |
void | setAlarmEnabled (bool tf) |
void | setAlarmLevel (double v) |
void | setAutoScale () |
void | setBorderWidth (int w) |
void | setFillBrush (const QBrush &b) |
void | setFillColor (const QColor &c) |
void | setMargin (int m) |
void | setMaxValue (double v) |
void | setMinValue (double v) |
void | setOrientation (Qt::Orientation o, ScalePos s) |
void | setPipeWidth (int w) |
void | setRange (double vmin, double vmax, bool lg=false) |
void | setScale (double vmin, double vmax, double step=0.0) |
void | setScale (const QwtScaleDiv &s) |
void | setScale (const QwtDoubleInterval &, double step=0.0) |
void | setScaleDraw (QwtScaleDraw *) |
void | setScaleEngine (QwtScaleEngine *) |
void | setScaleMaxMajor (int ticks) |
void | setScaleMaxMinor (int ticks) |
void | setScalePosition (ScalePos s) |
virtual QSize | sizeHint () const |
double | value () const |
virtual | ~QwtThermo () |
Protected Member Functions | |
const QwtAbstractScaleDraw * | abstractScaleDraw () const |
QwtAbstractScaleDraw * | abstractScaleDraw () |
void | draw (QPainter *p, const QRect &update_rect) |
void | drawThermo (QPainter *p) |
virtual void | fontChange (const QFont &oldFont) |
void | layoutThermo (bool update=true) |
virtual void | paintEvent (QPaintEvent *e) |
void | rescale (double vmin, double vmax, double step=0.0) |
virtual void | resizeEvent (QResizeEvent *e) |
virtual void | scaleChange () |
QwtScaleDraw * | scaleDraw () |
void | setAbstractScaleDraw (QwtAbstractScaleDraw *) |
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. QwtAbstractScale::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(); }
QwtThermo::QwtThermo | ( | QWidget * | parent = NULL | ) | [explicit] |
Constructor
parent | Parent widget |
QwtThermo::~QwtThermo | ( | ) | [virtual] |
Destructor.
const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw | ( | ) | const [protected, inherited] |
QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw | ( | ) | [protected, inherited] |
const QBrush & QwtThermo::alarmBrush | ( | ) | const |
Return the liquid brush above the alarm threshold.
const QColor & QwtThermo::alarmColor | ( | ) | const |
Return the liquid color above the alarm threshold.
bool QwtThermo::alarmEnabled | ( | ) | const |
Return if the alarm threshold is enabled or disabled.
double QwtThermo::alarmLevel | ( | ) | const |
Return the alarm threshold.
bool QwtAbstractScale::autoScale | ( | ) | const [inherited] |
true
if autoscaling is enabled int QwtThermo::borderWidth | ( | ) | const |
Return the border width of the thermometer pipe.
void QwtThermo::draw | ( | QPainter * | painter, |
const QRect & | rect | ||
) | [protected] |
Draw the whole QwtThermo.
painter | Painter |
rect | Update rectangle |
void QwtThermo::drawThermo | ( | QPainter * | painter | ) | [protected] |
Redraw the liquid in thermometer pipe.
painter | Painter |
const QBrush & QwtThermo::fillBrush | ( | ) | const |
Return the liquid brush.
const QColor & QwtThermo::fillColor | ( | ) | const |
Return the liquid color.
void QwtThermo::fontChange | ( | const QFont & | oldFont | ) | [protected, virtual] |
Notify a font change.
void QwtThermo::layoutThermo | ( | bool | update_geometry = true | ) | [protected] |
Recalculate the QwtThermo geometry and layout based on the QwtThermo::rect() and the fonts.
update_geometry | notify the layout system and call update to redraw the scale |
double QwtThermo::maxValue | ( | ) | const |
Return the maximum value.
QSize QwtThermo::minimumSizeHint | ( | ) | const [virtual] |
Return a minimum size hint.
double QwtThermo::minValue | ( | ) | const |
Return the minimum value.
void QwtThermo::paintEvent | ( | QPaintEvent * | event | ) | [protected, virtual] |
Qt paint event. event Paint event
int QwtThermo::pipeWidth | ( | ) | const |
Return the width of the pipe.
void QwtAbstractScale::rescale | ( | double | vmin, |
double | vmax, | ||
double | stepSize = 0.0 |
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) | [protected, inherited] |
Recalculate the scale division and update the scale draw.
vmin | Lower limit of the scale interval |
vmax | Upper limit of the scale interval |
stepSize | Major step size |
void QwtThermo::resizeEvent | ( | QResizeEvent * | e | ) | [protected, virtual] |
Qt resize event handler.
void QwtThermo::scaleChange | ( | ) | [protected, virtual] |
Notify a scale change.
Reimplemented from QwtAbstractScale.
QwtScaleDraw * QwtThermo::scaleDraw | ( | ) | [protected] |
const QwtScaleDraw * QwtThermo::scaleDraw | ( | ) | const |
const QwtScaleEngine * QwtAbstractScale::scaleEngine | ( | ) | const [inherited] |
QwtScaleEngine * QwtAbstractScale::scaleEngine | ( | ) | [inherited] |
const QwtScaleMap & QwtAbstractScale::scaleMap | ( | ) | const [inherited] |
int QwtAbstractScale::scaleMaxMajor | ( | ) | const [inherited] |
int QwtAbstractScale::scaleMaxMinor | ( | ) | const [inherited] |
QwtThermo::ScalePos QwtThermo::scalePosition | ( | ) | const |
Return the scale position.
void QwtAbstractScale::setAbstractScaleDraw | ( | QwtAbstractScaleDraw * | scaleDraw | ) | [protected, inherited] |
Set a scale draw.
scaleDraw has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setAbstractScaleDraw.
void QwtThermo::setAlarmBrush | ( | const QBrush & | brush | ) |
Specify the liquid brush above the alarm threshold.
brush | New brush. The default is solid white. |
void QwtThermo::setAlarmColor | ( | const QColor & | c | ) |
Specify the liquid color above the alarm threshold.
c | New color. The default is white. |
void QwtThermo::setAlarmEnabled | ( | bool | tf | ) |
Enable or disable the alarm threshold.
tf | true (disabled) or false (enabled) |
void QwtThermo::setAlarmLevel | ( | double | level | ) |
void QwtAbstractScale::setAutoScale | ( | ) | [inherited] |
Advise the widget to control the scale range internally.
Autoscaling is on by default.
void QwtThermo::setBorderWidth | ( | int | width | ) |
void QwtThermo::setFillBrush | ( | const QBrush & | brush | ) |
Change the brush of the liquid.
brush | New brush. The default brush is solid black. |
void QwtThermo::setFillColor | ( | const QColor & | c | ) |
Change the color of the liquid.
c | New color. The default color is black. |
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.
m | New Margin. The default values are 10 for horizontal orientation and 20 for vertical orientation. |
void QwtThermo::setMaxValue | ( | double | max | ) |
void QwtThermo::setMinValue | ( | double | min | ) |
void QwtThermo::setOrientation | ( | Qt::Orientation | o, |
ScalePos | s | ||
) |
Set the thermometer orientation and the scale position.
The scale position NoScale disables the scale.
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 NoScale. |
A valid combination of scale position and orientation is enforced:
void QwtThermo::setPipeWidth | ( | int | width | ) |
void QwtThermo::setRange | ( | double | vmin, |
double | vmax, | ||
bool | logarithmic = false |
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) |
Set the range.
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 |
void QwtAbstractScale::setScale | ( | const QwtDoubleInterval & | interval, |
double | stepSize = 0.0 |
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) | [inherited] |
Specify a scale.
Disable autoscaling and define a scale by an interval and a step size
interval | Interval |
stepSize | major step size |
void QwtAbstractScale::setScale | ( | const QwtScaleDiv & | scaleDiv | ) | [inherited] |
Specify a scale.
Disable autoscaling and define a scale by a scale division
scaleDiv | Scale division |
void QwtAbstractScale::setScale | ( | double | vmin, |
double | vmax, | ||
double | stepSize = 0.0 |
||
) | [inherited] |
Specify a scale.
Disable autoscaling and define a scale by an interval and a step size
vmin | lower limit of the scale interval |
vmax | upper limit of the scale interval |
stepSize | major step size |
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().
scaleDraw | ScaleDraw object, that has to be created with new and will be deleted in ~QwtThermo or the next call of setScaleDraw(). |
void QwtAbstractScale::setScaleEngine | ( | QwtScaleEngine * | scaleEngine | ) | [inherited] |
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.
void QwtAbstractScale::setScaleMaxMajor | ( | int | ticks | ) | [inherited] |
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.
ticks | maximal number of major ticks. |
void QwtAbstractScale::setScaleMaxMinor | ( | int | ticks | ) | [inherited] |
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.
ticks |
void QwtThermo::setScalePosition | ( | ScalePos | scalePos | ) |
Change the scale position (and thermometer orientation).
scalePos | Position of the scale. |
A valid combination of scale position and orientation is enforced:
void QwtThermo::setValue | ( | double | value | ) | [slot] |
QSize QwtThermo::sizeHint | ( | ) | const [virtual] |
double QwtThermo::value | ( | ) | const |
Return the value.