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_H
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11 | #define QWT_PLOT_H
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12 |
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13 | #include <qframe.h>
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14 | #include "qwt_global.h"
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15 | #include "qwt_array.h"
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16 | #include "qwt_text.h"
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17 | #include "qwt_plot_dict.h"
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18 | #include "qwt_scale_map.h"
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19 | #include "qwt_plot_printfilter.h"
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20 |
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21 | class QwtPlotLayout;
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22 | class QwtLegend;
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23 | class QwtScaleWidget;
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24 | class QwtScaleEngine;
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25 | class QwtScaleDiv;
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26 | class QwtScaleDraw;
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27 | class QwtTextLabel;
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28 | class QwtPlotCanvas;
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29 | class QwtPlotPrintFilter;
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30 |
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31 | /*!
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32 | \brief A 2-D plotting widget
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33 |
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34 | QwtPlot is a widget for plotting two-dimensional graphs.
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35 | An unlimited number of plot items can be displayed on
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36 | its canvas. Plot items might be curves (QwtPlotCurve), markers
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37 | (QwtPlotMarker), the grid (QwtPlotGrid), or anything else derived
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38 | from QwtPlotItem.
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39 | A plot can have up to four axes, with each plot item attached to an x- and
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40 | a y axis. The scales at the axes can be explicitely set (QwtScaleDiv), or
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41 | are calculated from the plot items, using algorithms (QwtScaleEngine) which
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42 | can be configured separately for each axis.
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43 |
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44 | \image html plot.png
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45 |
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46 | \par Example
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47 | The following example shows (schematically) the most simple
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48 | way to use QwtPlot. By default, only the left and bottom axes are
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49 | visible and their scales are computed automatically.
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50 | \verbatim
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51 | #include <qwt_plot.h>
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52 | #include <qwt_plot_curve.h>
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53 |
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54 | QwtPlot *myPlot = new QwtPlot("Two Curves", parent);
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55 |
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56 | // add curves
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57 | QwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");
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58 | QwtPlotCurve *curve2 = new QwtPlotCurve("Curve 2");
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59 |
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60 | // copy the data into the curves
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61 | curve1->setData(...);
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62 | curve2->setData(...);
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63 |
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64 | curve1->attach(myPlot);
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65 | curve2->attach(myPlot);
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66 |
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67 | // finally, refresh the plot
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68 | myPlot->replot();
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69 | \endverbatim
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70 | */
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71 |
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72 | class QWT_EXPORT QwtPlot: public QFrame, public QwtPlotDict
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73 | {
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74 | Q_OBJECT
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75 | Q_PROPERTY( QString propertiesDocument
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76 | READ grabProperties WRITE applyProperties )
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77 |
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78 | public:
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79 | /*!
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80 | Axis index
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81 |
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82 | - yLeft\n
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83 | - yRight\n
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84 | - xBottom\n
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85 | - xTop\n
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86 | */
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87 | enum Axis
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88 | {
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89 | yLeft,
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90 | yRight,
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91 | xBottom,
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92 | xTop,
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93 |
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94 | axisCnt
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95 | };
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96 |
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97 | /*!
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98 | Position of the legend, relative to the canvas.
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99 |
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100 | - LeftLegend\n
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101 | The legend will be left from the yLeft axis.
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102 | - RightLegend\n
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103 | The legend will be right from the yLeft axis.
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104 | - BottomLegend\n
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105 | The legend will be right below the xBottom axis.
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106 | - TopLegend\n
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107 | The legend will be between xTop axis and the title.
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108 | - ExternalLegend\n
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109 | External means that only the content of the legend
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110 | will be handled by QwtPlot, but not its geometry.
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111 | This might be interesting if an application wants to
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112 | have a legend in an external window ( or on the canvas ).
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113 |
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114 | \note In case of ExternalLegend, the legend is not
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115 | printed by print().
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116 |
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117 | \sa insertLegend()
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118 | */
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119 | enum LegendPosition
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120 | {
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121 | LeftLegend,
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122 | RightLegend,
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123 | BottomLegend,
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124 | TopLegend,
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125 |
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126 | ExternalLegend
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127 | };
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128 |
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129 | explicit QwtPlot(QWidget * = NULL);
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130 | explicit QwtPlot(const QwtText &title, QWidget *p = NULL);
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131 | #if QT_VERSION < 0x040000
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132 | explicit QwtPlot(QWidget *, const char* name);
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133 | #endif
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134 |
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135 | virtual ~QwtPlot();
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136 |
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137 | void applyProperties(const QString &);
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138 | QString grabProperties() const;
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139 |
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140 | void setAutoReplot(bool tf = true);
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141 | bool autoReplot() const;
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142 |
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143 | void print(QPaintDevice &p,
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144 | const QwtPlotPrintFilter & = QwtPlotPrintFilter()) const;
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145 | virtual void print(QPainter *, const QRect &rect,
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146 | const QwtPlotPrintFilter & = QwtPlotPrintFilter()) const;
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147 |
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148 | // Layout
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149 |
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150 | QwtPlotLayout *plotLayout();
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151 | const QwtPlotLayout *plotLayout() const;
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152 |
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153 | void setMargin(int margin);
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154 | int margin() const;
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155 |
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156 | // Title
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157 |
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158 | void setTitle(const QString &);
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159 | void setTitle(const QwtText &t);
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160 | QwtText title() const;
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161 |
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162 | QwtTextLabel *titleLabel();
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163 | const QwtTextLabel *titleLabel() const;
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164 |
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165 | // Canvas
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166 |
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167 | QwtPlotCanvas *canvas();
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168 | const QwtPlotCanvas *canvas() const;
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169 |
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170 | void setCanvasBackground (const QColor &c);
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171 | const QColor& canvasBackground() const;
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172 |
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173 | void setCanvasLineWidth(int w);
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174 | int canvasLineWidth() const;
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175 |
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176 | virtual QwtScaleMap canvasMap(int axisId) const;
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177 |
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178 | double invTransform(int axisId, int pos) const;
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179 | int transform(int axisId, double value) const;
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180 |
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181 | // Axes
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182 |
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183 | QwtScaleEngine *axisScaleEngine(int axisId);
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184 | const QwtScaleEngine *axisScaleEngine(int axisId) const;
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185 | void setAxisScaleEngine(int axisId, QwtScaleEngine *);
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186 |
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187 | void setAxisAutoScale(int axisId);
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188 | bool axisAutoScale(int axisId) const;
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189 |
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190 | void enableAxis(int axisId, bool tf = true);
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191 | bool axisEnabled(int axisId) const;
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192 |
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193 | void setAxisFont(int axisId, const QFont &f);
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194 | QFont axisFont(int axisId) const;
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195 |
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196 | void setAxisScale(int axisId, double min, double max, double step = 0);
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197 | void setAxisScaleDiv(int axisId, const QwtScaleDiv &);
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198 | void setAxisScaleDraw(int axisId, QwtScaleDraw *);
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199 |
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200 | double axisStepSize(int axisId) const;
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201 |
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202 | const QwtScaleDiv *axisScaleDiv(int axisId) const;
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203 | QwtScaleDiv *axisScaleDiv(int axisId);
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204 |
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205 | const QwtScaleDraw *axisScaleDraw(int axisId) const;
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206 | QwtScaleDraw *axisScaleDraw(int axisId);
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207 |
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208 | const QwtScaleWidget *axisWidget(int axisId) const;
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209 | QwtScaleWidget *axisWidget(int axisId);
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210 |
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211 | #if QT_VERSION < 0x040000
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212 | void setAxisLabelAlignment(int axisId, int);
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213 | #else
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214 | void setAxisLabelAlignment(int axisId, Qt::Alignment);
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215 | #endif
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216 | void setAxisLabelRotation(int axisId, double rotation);
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217 |
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218 | void setAxisTitle(int axisId, const QString &);
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219 | void setAxisTitle(int axisId, const QwtText &);
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220 | QwtText axisTitle(int axisId) const;
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221 |
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222 | void setAxisMaxMinor(int axisId, int maxMinor);
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223 | int axisMaxMajor(int axisId) const;
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224 | void setAxisMaxMajor(int axisId, int maxMajor);
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225 | int axisMaxMinor(int axisId) const;
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226 |
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227 | // Legend
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228 |
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229 | void insertLegend(QwtLegend *, LegendPosition = QwtPlot::RightLegend,
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230 | double ratio = -1.0);
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231 |
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232 | QwtLegend *legend();
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233 | const QwtLegend *legend() const;
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234 |
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235 | // Misc
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236 |
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237 | virtual void polish();
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238 | virtual QSize sizeHint() const;
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239 | virtual QSize minimumSizeHint() const;
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240 |
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241 | virtual void updateLayout();
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242 | virtual void drawCanvas(QPainter *);
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243 |
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244 | void updateAxes();
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245 |
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246 | virtual bool event(QEvent *);
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247 |
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248 | signals:
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249 | /*!
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250 | A signal which is emitted when the user has clicked on
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251 | a legend item, which is in QwtLegend::ClickableItem mode.
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252 |
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253 | \param plotItem Corresponding plot item of the
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254 | selected legend item
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255 |
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256 | \note clicks are disabled as default
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257 | \sa QwtLegend::setItemMode(), QwtLegend::itemMode()
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258 | */
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259 | void legendClicked(QwtPlotItem *plotItem);
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260 |
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261 | /*!
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262 | A signal which is emitted when the user has clicked on
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263 | a legend item, which is in QwtLegend::CheckableItem mode
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264 |
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265 | \param plotItem Corresponding plot item of the
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266 | selected legend item
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267 | \param on True when the legen item is checked
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268 |
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269 | \note clicks are disabled as default
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270 | \sa QwtLegend::setItemMode(), QwtLegend::itemMode()
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271 | */
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272 |
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273 | void legendChecked(QwtPlotItem *plotItem, bool on);
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274 |
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275 | public slots:
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276 | virtual void clear();
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277 |
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278 | virtual void replot();
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279 | void autoRefresh();
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280 |
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281 | protected slots:
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282 | virtual void legendItemClicked();
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283 | virtual void legendItemChecked(bool);
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284 |
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285 | protected:
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286 | static bool axisValid(int axisId);
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287 |
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288 | virtual void drawItems(QPainter *, const QRect &,
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289 | const QwtScaleMap maps[axisCnt],
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290 | const QwtPlotPrintFilter &) const;
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291 |
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292 | virtual void updateTabOrder();
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293 |
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294 | virtual void resizeEvent(QResizeEvent *e);
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295 |
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296 | virtual void printLegendItem(QPainter *,
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297 | const QWidget *, const QRect &) const;
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298 |
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299 | virtual void printTitle(QPainter *, const QRect &) const;
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300 |
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301 | virtual void printScale(QPainter *, int axisId, int startDist, int endDist,
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302 | int baseDist, const QRect &) const;
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303 |
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304 | virtual void printCanvas(QPainter *,
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305 | const QRect &boundingRect, const QRect &canvasRect,
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306 | const QwtScaleMap maps[axisCnt], const QwtPlotPrintFilter &) const;
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307 |
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308 | virtual void printLegend(QPainter *, const QRect &) const;
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309 |
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310 | private:
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311 | void initAxesData();
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312 | void deleteAxesData();
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313 | void updateScaleDiv();
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314 |
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315 | void initPlot(const QwtText &title);
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316 |
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317 | class AxisData;
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318 | AxisData *d_axisData[axisCnt];
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319 |
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320 | class PrivateData;
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321 | PrivateData *d_data;
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322 | };
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323 |
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324 | #endif
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