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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