[89] | 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #ifndef QWT_THERMO_H
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| 11 | #define QWT_THERMO_H
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| 12 |
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| 13 | #include <qwidget.h>
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| 14 | #include <qcolor.h>
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| 15 | #include <qfont.h>
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| 16 | #include <qrect.h>
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| 17 | #include "qwt_global.h"
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| 18 | #include "qwt_abstract_scale.h"
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| 19 |
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| 20 | class QwtScaleDraw;
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| 21 |
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| 22 | /*!
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| 23 | \brief The Thermometer Widget
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| 24 |
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| 25 | QwtThermo is a widget which displays a value in an interval. It supports:
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| 26 | - a horizontal or vertical layout;
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| 27 | - a range;
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| 28 | - a scale;
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| 29 | - an alarm level.
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| 30 |
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| 31 | \image html sysinfo.png
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| 32 |
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| 33 | By default, the scale and range run over the same interval of values.
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| 34 | QwtAbstractScale::setScale() changes the interval of the scale and allows
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| 35 | easy conversion between physical units.
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| 36 |
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| 37 | The example shows how to make the scale indicate in degrees Fahrenheit and
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| 38 | to set the value in degrees Kelvin:
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| 39 | \code
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| 40 | #include <qapplication.h>
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| 41 | #include <qwt_thermo.h>
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| 42 |
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| 43 | double Kelvin2Fahrenheit(double kelvin)
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| 44 | {
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| 45 | // see http://en.wikipedia.org/wiki/Kelvin
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| 46 | return 1.8*kelvin - 459.67;
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| 47 | }
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| 48 |
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| 49 | int main(int argc, char **argv)
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| 50 | {
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| 51 | const double minKelvin = 0.0;
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| 52 | const double maxKelvin = 500.0;
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| 53 |
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| 54 | QApplication a(argc, argv);
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| 55 | QwtThermo t;
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| 56 | t.setRange(minKelvin, maxKelvin);
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| 57 | t.setScale(Kelvin2Fahrenheit(minKelvin), Kelvin2Fahrenheit(maxKelvin));
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| 58 | // set the value in Kelvin but the scale displays in Fahrenheit
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| 59 | // 273.15 Kelvin = 0 Celsius = 32 Fahrenheit
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| 60 | t.setValue(273.15);
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| 61 | a.setMainWidget(&t);
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| 62 | t.show();
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| 63 | return a.exec();
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| 64 | }
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| 65 | \endcode
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| 66 |
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| 67 | \todo Improve the support for a logarithmic range and/or scale.
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| 68 | */
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| 69 | class QWT_EXPORT QwtThermo: public QWidget, public QwtAbstractScale
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| 70 | {
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| 71 | Q_OBJECT
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| 72 |
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| 73 | Q_ENUMS( ScalePos )
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| 74 |
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| 75 | Q_PROPERTY( QBrush alarmBrush READ alarmBrush WRITE setAlarmBrush )
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| 76 | Q_PROPERTY( QColor alarmColor READ alarmColor WRITE setAlarmColor )
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| 77 | Q_PROPERTY( bool alarmEnabled READ alarmEnabled WRITE setAlarmEnabled )
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| 78 | Q_PROPERTY( double alarmLevel READ alarmLevel WRITE setAlarmLevel )
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| 79 | Q_PROPERTY( ScalePos scalePosition READ scalePosition
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| 80 | WRITE setScalePosition )
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| 81 | Q_PROPERTY( int borderWidth READ borderWidth WRITE setBorderWidth )
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| 82 | Q_PROPERTY( QBrush fillBrush READ fillBrush WRITE setFillBrush )
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| 83 | Q_PROPERTY( QColor fillColor READ fillColor WRITE setFillColor )
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| 84 | Q_PROPERTY( double maxValue READ maxValue WRITE setMaxValue )
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| 85 | Q_PROPERTY( double minValue READ minValue WRITE setMinValue )
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| 86 | Q_PROPERTY( int pipeWidth READ pipeWidth WRITE setPipeWidth )
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| 87 | Q_PROPERTY( double value READ value WRITE setValue )
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| 88 |
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| 89 | public:
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| 90 | /*
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| 91 | Scale position. QwtThermo tries to enforce valid combinations of its
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| 92 | orientation and scale position:
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| 93 | - Qt::Horizonal combines with NoScale, TopScale and BottomScale
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| 94 | - Qt::Vertical combines with NoScale, LeftScale and RightScale
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| 95 |
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| 96 | \sa setOrientation(), setScalePosition()
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| 97 | */
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| 98 | enum ScalePos
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| 99 | {
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| 100 | NoScale,
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| 101 | LeftScale,
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| 102 | RightScale,
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| 103 | TopScale,
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| 104 | BottomScale
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| 105 | };
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| 106 |
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| 107 | explicit QwtThermo(QWidget *parent = NULL);
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| 108 | #if QT_VERSION < 0x040000
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| 109 | explicit QwtThermo(QWidget *parent, const char *name);
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| 110 | #endif
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| 111 | virtual ~QwtThermo();
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| 112 |
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| 113 | void setOrientation(Qt::Orientation o, ScalePos s);
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| 114 |
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| 115 | void setScalePosition(ScalePos s);
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| 116 | ScalePos scalePosition() const;
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| 117 |
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| 118 | void setBorderWidth(int w);
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| 119 | int borderWidth() const;
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| 120 |
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| 121 | void setFillBrush(const QBrush &b);
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| 122 | const QBrush &fillBrush() const;
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| 123 |
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| 124 | void setFillColor(const QColor &c);
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| 125 | const QColor &fillColor() const;
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| 126 |
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| 127 | void setAlarmBrush(const QBrush &b);
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| 128 | const QBrush &alarmBrush() const;
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| 129 |
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| 130 | void setAlarmColor(const QColor &c);
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| 131 | const QColor &alarmColor() const;
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| 132 |
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| 133 | void setAlarmLevel(double v);
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| 134 | double alarmLevel() const;
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| 135 |
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| 136 | void setAlarmEnabled(bool tf);
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| 137 | bool alarmEnabled() const;
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| 138 |
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| 139 | void setPipeWidth(int w);
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| 140 | int pipeWidth() const;
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| 141 |
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| 142 | void setMaxValue(double v);
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| 143 | double maxValue() const;
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| 144 |
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| 145 | void setMinValue(double v);
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| 146 | double minValue() const;
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| 147 |
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| 148 | double value() const;
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| 149 |
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| 150 | void setRange(double vmin, double vmax, bool lg = false);
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| 151 | void setMargin(int m);
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| 152 |
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| 153 | virtual QSize sizeHint() const;
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| 154 | virtual QSize minimumSizeHint() const;
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| 155 |
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| 156 | void setScaleDraw(QwtScaleDraw *);
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| 157 | const QwtScaleDraw *scaleDraw() const;
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| 158 |
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| 159 | public slots:
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| 160 | void setValue(double val);
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| 161 |
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| 162 | protected:
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| 163 | void draw(QPainter *p, const QRect& update_rect);
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| 164 | void drawThermo(QPainter *p);
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| 165 | void layoutThermo( bool update = true );
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| 166 | virtual void scaleChange();
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| 167 | virtual void fontChange(const QFont &oldFont);
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| 168 |
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| 169 | virtual void paintEvent(QPaintEvent *e);
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| 170 | virtual void resizeEvent(QResizeEvent *e);
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| 171 |
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| 172 | QwtScaleDraw *scaleDraw();
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| 173 |
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| 174 | private:
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| 175 | void initThermo();
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| 176 | int transform(double v) const;
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| 177 |
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| 178 | class PrivateData;
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| 179 | PrivateData *d_data;
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| 180 | };
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| 181 |
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| 182 | #endif
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