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 | #include "qwt_compass.h"
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11 | #include "qwt_compass_rose.h"
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12 | #include "qwt_math.h"
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13 | #include "qwt_scale_draw.h"
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14 | #include "qwt_painter.h"
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15 | #include "qwt_dial_needle.h"
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16 | #include <qpainter.h>
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17 | #include <qpixmap.h>
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18 | #include <qevent.h>
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19 |
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20 | /*!
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21 | \brief Constructor
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22 |
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23 | Initializes a label map for multiples of 45 degrees
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24 | */
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25 | QwtCompassScaleDraw::QwtCompassScaleDraw()
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26 | {
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27 | enableComponent( QwtAbstractScaleDraw::Backbone, false );
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28 | enableComponent( QwtAbstractScaleDraw::Ticks, false );
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29 |
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30 | d_labelMap.insert( 0.0, QString::fromLatin1( "N" ) );
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31 | d_labelMap.insert( 45.0, QString::fromLatin1( "NE" ) );
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32 | d_labelMap.insert( 90.0, QString::fromLatin1( "E" ) );
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33 | d_labelMap.insert( 135.0, QString::fromLatin1( "SE" ) );
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34 | d_labelMap.insert( 180.0, QString::fromLatin1( "S" ) );
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35 | d_labelMap.insert( 225.0, QString::fromLatin1( "SW" ) );
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36 | d_labelMap.insert( 270.0, QString::fromLatin1( "W" ) );
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37 | d_labelMap.insert( 315.0, QString::fromLatin1( "NW" ) );
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38 |
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39 | #if 0
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40 | d_labelMap.insert( 22.5, QString::fromLatin1( "NNE" ) );
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41 | d_labelMap.insert( 67.5, QString::fromLatin1( "NEE" ) );
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42 | d_labelMap.insert( 112.5, QString::fromLatin1( "SEE" ) );
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43 | d_labelMap.insert( 157.5, QString::fromLatin1( "SSE" ) );
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44 | d_labelMap.insert( 202.5, QString::fromLatin1( "SSW" ) );
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45 | d_labelMap.insert( 247.5, QString::fromLatin1( "SWW" ) );
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46 | d_labelMap.insert( 292.5, QString::fromLatin1( "NWW" ) );
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47 | d_labelMap.insert( 337.5, QString::fromLatin1( "NNW" ) );
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48 | #endif
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49 | }
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50 |
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51 | /*!
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52 | \brief Constructor
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53 |
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54 | \param map Value to label map
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55 | */
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56 | QwtCompassScaleDraw::QwtCompassScaleDraw( const QMap<double, QString> &map ):
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57 | d_labelMap( map )
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58 | {
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59 | enableComponent( QwtAbstractScaleDraw::Backbone, false );
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60 | enableComponent( QwtAbstractScaleDraw::Ticks, false );
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61 | }
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62 |
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63 | /*!
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64 | \brief Set a map, mapping values to labels
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65 | \param map Value to label map
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66 |
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67 | The values of the major ticks are found by looking into this
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68 | map. The default map consists of the labels N, NE, E, SE, S, SW, W, NW.
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69 |
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70 | \warning The map will have no effect for values that are no major
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71 | tick values. Major ticks can be changed by QwtScaleDraw::setScale
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72 |
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73 | \sa labelMap(), scaleDraw(), setScale()
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74 | */
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75 | void QwtCompassScaleDraw::setLabelMap( const QMap<double, QString> &map )
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76 | {
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77 | d_labelMap = map;
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78 | }
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79 |
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80 |
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81 | /*!
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82 | \return map, mapping values to labels
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83 | \sa setLabelMap()
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84 | */
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85 | QMap<double, QString> QwtCompassScaleDraw::labelMap() const
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86 | {
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87 | return d_labelMap;
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88 | }
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89 |
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90 | /*!
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91 | Map a value to a corresponding label
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92 |
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93 | \param value Value that will be mapped
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94 |
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95 | label() looks in the labelMap() for a corresponding label for value
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96 | or returns an null text.
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97 |
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98 | \return Label, or QString::null
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99 | \sa labelMap(), setLabelMap()
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100 | */
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101 |
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102 | QwtText QwtCompassScaleDraw::label( double value ) const
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103 | {
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104 | if ( qFuzzyCompare( value + 1.0, 1.0 ) )
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105 | value = 0.0;
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106 |
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107 | if ( value < 0.0 )
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108 | value += 360.0;
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109 |
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110 | if ( d_labelMap.contains( value ) )
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111 | return d_labelMap[value];
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112 |
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113 | return QwtText();
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114 | }
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115 |
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116 | class QwtCompass::PrivateData
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117 | {
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118 | public:
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119 | PrivateData():
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120 | rose( NULL )
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121 | {
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122 | }
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123 |
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124 | ~PrivateData()
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125 | {
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126 | delete rose;
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127 | }
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128 |
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129 | QwtCompassRose *rose;
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130 | };
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131 |
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132 | /*!
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133 | \brief Constructor
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134 | \param parent Parent widget
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135 |
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136 | Create a compass widget with a scale, no needle and no rose.
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137 | The default origin is 270.0 with no valid value. It accepts
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138 | mouse and keyboard inputs and has no step size. The default mode
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139 | is QwtDial::RotateNeedle.
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140 | */
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141 | QwtCompass::QwtCompass( QWidget* parent ):
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142 | QwtDial( parent )
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143 | {
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144 | d_data = new PrivateData;
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145 |
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146 | setScaleDraw( new QwtCompassScaleDraw() );
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147 |
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148 | setOrigin( 270.0 );
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149 | setWrapping( true );
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150 |
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151 | setScaleMaxMajor( 36 );
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152 | setScaleMaxMinor( 10 );
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153 |
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154 | setScale( 0.0, 360.0 ); // degrees as default
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155 | setTotalSteps( 360 );
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156 | }
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157 |
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158 | //! Destructor
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159 | QwtCompass::~QwtCompass()
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160 | {
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161 | delete d_data;
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162 | }
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163 |
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164 |
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165 | /*!
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166 | Draw the contents of the scale
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167 |
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168 | \param painter Painter
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169 | \param center Center of the content circle
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170 | \param radius Radius of the content circle
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171 | */
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172 | void QwtCompass::drawScaleContents( QPainter *painter,
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173 | const QPointF ¢er, double radius ) const
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174 | {
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175 | QPalette::ColorGroup cg;
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176 | if ( isEnabled() )
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177 | cg = hasFocus() ? QPalette::Active : QPalette::Inactive;
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178 | else
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179 | cg = QPalette::Disabled;
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180 |
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181 | double north = origin();
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182 | if ( isValid() )
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183 | {
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184 | if ( mode() == RotateScale )
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185 | north -= value();
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186 | }
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187 |
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188 | const int margin = 4;
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189 | drawRose( painter, center, radius - margin, 360.0 - north, cg );
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190 | }
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191 |
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192 | /*!
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193 | Draw the compass rose
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194 |
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195 | \param painter Painter
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196 | \param center Center of the compass
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197 | \param radius of the circle, where to paint the rose
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198 | \param north Direction pointing north, in degrees counter clockwise
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199 | \param cg Color group
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200 | */
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201 | void QwtCompass::drawRose( QPainter *painter, const QPointF ¢er,
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202 | double radius, double north, QPalette::ColorGroup cg ) const
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203 | {
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204 | if ( d_data->rose )
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205 | d_data->rose->draw( painter, center, radius, north, cg );
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206 | }
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207 |
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208 | /*!
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209 | Set a rose for the compass
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210 | \param rose Compass rose
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211 | \warning The rose will be deleted, when a different rose is
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212 | set or in ~QwtCompass
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213 | \sa rose()
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214 | */
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215 | void QwtCompass::setRose( QwtCompassRose *rose )
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216 | {
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217 | if ( rose != d_data->rose )
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218 | {
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219 | if ( d_data->rose )
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220 | delete d_data->rose;
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221 |
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222 | d_data->rose = rose;
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223 | update();
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224 | }
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225 | }
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226 |
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227 | /*!
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228 | \return rose
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229 | \sa setRose()
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230 | */
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231 | const QwtCompassRose *QwtCompass::rose() const
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232 | {
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233 | return d_data->rose;
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234 | }
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235 |
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236 | /*!
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237 | \return rose
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238 | \sa setRose()
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239 | */
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240 | QwtCompassRose *QwtCompass::rose()
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241 | {
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242 | return d_data->rose;
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243 | }
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244 |
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245 | /*!
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246 | Handles key events
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247 |
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248 | Beside the keys described in QwtDial::keyPressEvent numbers
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249 | from 1-9 (without 5) set the direction according to their
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250 | position on the num pad.
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251 |
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252 | \sa isReadOnly()
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253 | */
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254 | void QwtCompass::keyPressEvent( QKeyEvent *kev )
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255 | {
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256 | if ( isReadOnly() )
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257 | return;
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258 |
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259 | #if 0
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260 | if ( kev->key() == Key_5 )
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261 | {
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262 | invalidate(); // signal ???
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263 | return;
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264 | }
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265 | #endif
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266 |
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267 | double newValue = value();
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268 |
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269 | if ( kev->key() >= Qt::Key_1 && kev->key() <= Qt::Key_9 )
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270 | {
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271 | if ( mode() != RotateNeedle || kev->key() == Qt::Key_5 )
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272 | return;
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273 |
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274 | switch ( kev->key() )
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275 | {
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276 | case Qt::Key_6:
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277 | newValue = 180.0 * 0.0;
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278 | break;
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279 | case Qt::Key_3:
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280 | newValue = 180.0 * 0.25;
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281 | break;
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282 | case Qt::Key_2:
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283 | newValue = 180.0 * 0.5;
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284 | break;
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285 | case Qt::Key_1:
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286 | newValue = 180.0 * 0.75;
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287 | break;
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288 | case Qt::Key_4:
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289 | newValue = 180.0 * 1.0;
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290 | break;
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291 | case Qt::Key_7:
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292 | newValue = 180.0 * 1.25;
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293 | break;
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294 | case Qt::Key_8:
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295 | newValue = 180.0 * 1.5;
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296 | break;
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297 | case Qt::Key_9:
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298 | newValue = 180.0 * 1.75;
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299 | break;
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300 | }
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301 | newValue -= origin();
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302 | setValue( newValue );
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303 | }
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304 | else
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305 | {
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306 | QwtDial::keyPressEvent( kev );
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307 | }
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308 | }
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