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_PLOT_SERIES_ITEM_H
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11 | #define QWT_PLOT_SERIES_ITEM_H
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12 |
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13 | #include "qwt_global.h"
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14 | #include "qwt_plot_item.h"
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15 | #include "qwt_scale_div.h"
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16 | #include "qwt_series_data.h"
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17 |
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18 | /*!
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19 | \brief Base class for plot items representing a series of samples
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20 | */
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21 | class QWT_EXPORT QwtPlotAbstractSeriesItem: public QwtPlotItem
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22 | {
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23 | public:
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24 | explicit QwtPlotAbstractSeriesItem( const QString &title = QString::null );
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25 | explicit QwtPlotAbstractSeriesItem( const QwtText &title );
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26 |
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27 | virtual ~QwtPlotAbstractSeriesItem();
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28 |
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29 | void setOrientation( Qt::Orientation );
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30 | Qt::Orientation orientation() const;
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31 |
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32 | virtual void draw( QPainter *p,
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33 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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34 | const QRectF & ) const;
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35 |
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36 | /*!
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37 | Draw a subset of the samples
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38 |
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39 | \param painter Painter
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40 | \param xMap Maps x-values into pixel coordinates.
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41 | \param yMap Maps y-values into pixel coordinates.
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42 | \param canvasRect Contents rect of the canvas
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43 | \param from Index of the first point to be painted
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44 | \param to Index of the last point to be painted. If to < 0 the
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45 | curve will be painted to its last point.
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46 | */
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47 | virtual void drawSeries( QPainter *painter,
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48 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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49 | const QRectF &canvasRect, int from, int to ) const = 0;
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50 |
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51 | private:
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52 | class PrivateData;
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53 | PrivateData *d_data;
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54 | };
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55 |
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56 | /*!
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57 | \brief Class template for plot items representing a series of samples
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58 | */
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59 | template <typename T>
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60 | class QwtPlotSeriesItem: public QwtPlotAbstractSeriesItem
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61 | {
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62 | public:
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63 | explicit QwtPlotSeriesItem<T>( const QString &title = QString::null );
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64 | explicit QwtPlotSeriesItem<T>( const QwtText &title );
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65 |
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66 | virtual ~QwtPlotSeriesItem<T>();
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67 |
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68 | void setData( QwtSeriesData<T> * );
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69 |
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70 | QwtSeriesData<T> *data();
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71 | const QwtSeriesData<T> *data() const;
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72 |
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73 | size_t dataSize() const;
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74 | T sample( int index ) const;
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75 |
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76 | virtual QRectF boundingRect() const;
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77 | virtual void updateScaleDiv( const QwtScaleDiv &,
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78 | const QwtScaleDiv & );
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79 |
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80 | protected:
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81 | //! Series
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82 | QwtSeriesData<T> *d_series;
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83 | };
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84 |
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85 | /*!
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86 | Constructor
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87 | \param title Title of the series item
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88 | */
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89 | template <typename T>
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90 | QwtPlotSeriesItem<T>::QwtPlotSeriesItem( const QString &title ):
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91 | QwtPlotAbstractSeriesItem( QwtText( title ) ),
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92 | d_series( NULL )
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93 | {
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94 | }
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95 |
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96 | /*!
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97 | Constructor
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98 | \param title Title of the series item
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99 | */
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100 | template <typename T>
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101 | QwtPlotSeriesItem<T>::QwtPlotSeriesItem( const QwtText &title ):
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102 | QwtPlotAbstractSeriesItem( title ),
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103 | d_series( NULL )
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104 | {
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105 | }
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106 |
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107 | //! Destructor
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108 | template <typename T>
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109 | QwtPlotSeriesItem<T>::~QwtPlotSeriesItem()
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110 | {
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111 | delete d_series;
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112 | }
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113 |
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114 | //! \return the the curve data
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115 | template <typename T>
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116 | inline QwtSeriesData<T> *QwtPlotSeriesItem<T>::data()
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117 | {
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118 | return d_series;
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119 | }
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120 |
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121 | //! \return the the curve data
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122 | template <typename T>
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123 | inline const QwtSeriesData<T> *QwtPlotSeriesItem<T>::data() const
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124 | {
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125 | return d_series;
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126 | }
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127 |
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128 | /*!
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129 | \param index Index
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130 | \return Sample at position index
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131 | */
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132 | template <typename T>
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133 | inline T QwtPlotSeriesItem<T>::sample( int index ) const
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134 | {
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135 | return d_series ? d_series->sample( index ) : T();
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136 | }
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137 |
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138 | /*!
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139 | Assign a series of samples
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140 |
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141 | \param data Data
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142 | \warning The item takes ownership of the data object, deleting
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143 | it when its not used anymore.
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144 | */
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145 | template <typename T>
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146 | void QwtPlotSeriesItem<T>::setData( QwtSeriesData<T> *data )
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147 | {
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148 | if ( d_series != data )
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149 | {
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150 | delete d_series;
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151 | d_series = data;
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152 | itemChanged();
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153 | }
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154 | }
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155 |
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156 | /*!
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157 | Return the size of the data arrays
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158 | \sa setData()
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159 | */
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160 | template <typename T>
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161 | size_t QwtPlotSeriesItem<T>::dataSize() const
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162 | {
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163 | if ( d_series == NULL )
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164 | return 0;
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165 |
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166 | return d_series->size();
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167 | }
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168 |
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169 | /*!
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170 | \return Bounding rectangle of the data.
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171 | If there is no bounding rect, like for empty data the rectangle is invalid.
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172 |
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173 | \sa QwtSeriesData<T>::boundingRect(), QRectF::isValid()
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174 | */
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175 | template <typename T>
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176 | QRectF QwtPlotSeriesItem<T>::boundingRect() const
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177 | {
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178 | if ( d_series == NULL )
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179 | return QRectF( 1.0, 1.0, -2.0, -2.0 ); // invalid
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180 |
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181 | return d_series->boundingRect();
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182 | }
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183 |
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184 | /*!
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185 | Update the rect of interest according to the current scale ranges
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186 |
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187 | \param xScaleDiv Scale division of the x-axis
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188 | \param yScaleDiv Scale division of the y-axis
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189 |
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190 | \sa QwtSeriesData<T>::setRectOfInterest()
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191 | */
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192 | template <typename T>
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193 | void QwtPlotSeriesItem<T>::updateScaleDiv(
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194 | const QwtScaleDiv &xScaleDiv, const QwtScaleDiv &yScaleDiv )
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195 | {
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196 | const QRectF rect = QRectF(
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197 | xScaleDiv.lowerBound(), yScaleDiv.lowerBound(),
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198 | xScaleDiv.range(), yScaleDiv.range() );
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199 |
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200 | d_series->setRectOfInterest( rect );
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201 | }
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202 |
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203 | #endif
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