#pragma once

#include "qwt_abstract_scale.h"

#include <qwidget.h>

class QwtScaleDraw;

class QwtColorMap;

/*!

\brief 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;

\image html sysinfo.png

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

- QPalette::WindowText

For the axis of the scale

- QPalette::Text

For the labels of the scale

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:

\code

#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();

}

\endcode

\todo Improve the support for a logarithmic range and/or scale.

*/

class QwtThermo: public QWidget, public QwtAbstractScale

};