1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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2 | * QwtPolar Widget Library
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3 | * Copyright (C) 2008 Uwe Rathmann
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4 | *
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5 | * This library is free software; you can redistribute it and/or
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6 | * modify it under the terms of the Qwt License, Version 1.0
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7 | *****************************************************************************/
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8 |
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9 | #include "qwt_polar_renderer.h"
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10 | #include "qwt_polar_plot.h"
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11 | #include "qwt_polar_layout.h"
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12 | #include <qwt_legend.h>
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13 | #include <qwt_legend_item.h>
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14 | #include <qwt_dyngrid_layout.h>
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15 | #include <qwt_text_label.h>
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16 | #include <qwt_text.h>
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17 | #include <qpainter.h>
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18 | #include <qprinter.h>
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19 | #include <qimagewriter.h>
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20 | #include <qfileinfo.h>
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21 | #include <qmath.h>
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22 | #ifndef QWT_NO_POLAR_POLAR_SVG
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23 | #ifdef QT_SVG_LIB
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24 | #include <qsvggenerator.h>
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25 | #endif
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26 | #endif
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27 |
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28 |
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29 | static inline double qwtDistance(
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30 | const QPointF &p1, const QPointF &p2 )
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31 | {
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32 | double dx = p2.x() - p1.x();
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33 | double dy = p2.y() - p1.y();
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34 | return qSqrt( dx * dx + dy * dy );
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35 | }
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36 |
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37 | class QwtPolarRenderer::PrivateData
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38 | {
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39 | public:
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40 | PrivateData():
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41 | plot( NULL )
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42 | {
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43 | }
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44 |
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45 | QwtPolarPlot *plot;
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46 | };
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47 |
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48 | /*!
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49 | Constructor
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50 | \param parent Parent object
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51 | */
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52 | QwtPolarRenderer::QwtPolarRenderer( QObject *parent ):
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53 | QObject( parent )
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54 | {
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55 | d_data = new PrivateData;
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56 | }
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57 |
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58 | //! Destructor
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59 | QwtPolarRenderer::~QwtPolarRenderer()
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60 | {
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61 | delete d_data;
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62 | }
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63 |
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64 | /*!
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65 | Render a polar plot to a file
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66 |
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67 | The format of the document will be autodetected from the
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68 | suffix of the filename.
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69 |
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70 | \param plot Plot widget
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71 | \param fileName Path of the file, where the document will be stored
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72 | \param sizeMM Size for the document in millimeters.
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73 | \param resolution Resolution in dots per Inch (dpi)
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74 | */
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75 | void QwtPolarRenderer::renderDocument( QwtPolarPlot *plot,
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76 | const QString &fileName, const QSizeF &sizeMM, int resolution )
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77 | {
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78 | renderDocument( plot, fileName,
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79 | QFileInfo( fileName ).suffix(), sizeMM, resolution );
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80 | }
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81 |
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82 | /*!
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83 | Render a plot to a file
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84 |
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85 | Supported formats are:
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86 |
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87 | - pdf\n
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88 | - ps\n
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89 | - svg\n
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90 | - all image formats supported by Qt, see QImageWriter::supportedImageFormats()
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91 |
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92 | \param plot Plot widget
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93 | \param fileName Path of the file, where the document will be stored
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94 | \param format Format for the document
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95 | \param sizeMM Size for the document in millimeters.
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96 | \param resolution Resolution in dots per Inch (dpi)
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97 |
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98 | \sa renderTo(), render(), QwtPainter::setRoundingAlignment()
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99 | */
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100 | void QwtPolarRenderer::renderDocument( QwtPolarPlot *plot,
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101 | const QString &fileName, const QString &format,
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102 | const QSizeF &sizeMM, int resolution )
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103 | {
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104 | if ( plot == NULL || sizeMM.isEmpty() || resolution <= 0 )
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105 | return;
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106 |
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107 | QString title = plot->title().text();
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108 | if ( title.isEmpty() )
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109 | title = "Plot Document";
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110 |
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111 | const double mmToInch = 1.0 / 25.4;
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112 | const QSizeF size = sizeMM * mmToInch * resolution;
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113 |
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114 | const QRectF documentRect( 0.0, 0.0, size.width(), size.height() );
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115 |
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116 | const QString fmt = format.toLower();
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117 | if ( format == "pdf" || format == "ps" )
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118 | {
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119 | QPrinter printer;
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120 | printer.setFullPage( true );
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121 | printer.setPaperSize( sizeMM, QPrinter::Millimeter );
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122 | printer.setDocName( title );
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123 | printer.setOutputFileName( fileName );
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124 | printer.setOutputFormat( ( format == "pdf" )
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125 | ? QPrinter::PdfFormat : QPrinter::PostScriptFormat );
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126 | printer.setResolution( resolution );
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127 |
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128 | QPainter painter( &printer );
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129 | render( plot, &painter, documentRect );
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130 | }
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131 | #ifndef QWT_NO_POLAR_SVG
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132 | #ifdef QT_SVG_LIB
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133 | #if QT_VERSION >= 0x040500
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134 | else if ( format == "svg" )
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135 | {
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136 | QSvgGenerator generator;
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137 | generator.setTitle( title );
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138 | generator.setFileName( fileName );
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139 | generator.setResolution( resolution );
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140 | generator.setViewBox( documentRect );
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141 |
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142 | QPainter painter( &generator );
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143 | render( plot, &painter, documentRect );
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144 | }
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145 | #endif
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146 | #endif
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147 | #endif
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148 | else
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149 | {
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150 | if ( QImageWriter::supportedImageFormats().indexOf(
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151 | format.toLatin1() ) >= 0 )
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152 | {
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153 | const QRect imageRect = documentRect.toRect();
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154 | const int dotsPerMeter = qRound( resolution * mmToInch * 1000.0 );
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155 |
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156 | QImage image( imageRect.size(), QImage::Format_ARGB32 );
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157 | image.setDotsPerMeterX( dotsPerMeter );
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158 | image.setDotsPerMeterY( dotsPerMeter );
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159 | image.fill( QColor( Qt::white ).rgb() );
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160 |
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161 | QPainter painter( &image );
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162 | render( plot, &painter, imageRect );
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163 | painter.end();
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164 |
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165 | image.save( fileName, format.toLatin1() );
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166 | }
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167 | }
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168 | }
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169 |
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170 | /*!
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171 | \brief Render the plot to a \c QPaintDevice
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172 |
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173 | This function renders the contents of a QwtPolarPlot instance to
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174 | \c QPaintDevice object. The target rectangle is derived from
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175 | its device metrics.
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176 |
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177 | \param plot Plot to be rendered
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178 | \param paintDevice device to paint on, f.e a QImage
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179 |
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180 | \sa renderDocument(), render(), QwtPainter::setRoundingAlignment()
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181 | */
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182 |
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183 | void QwtPolarRenderer::renderTo(
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184 | QwtPolarPlot *plot, QPaintDevice &paintDevice ) const
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185 | {
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186 | int w = paintDevice.width();
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187 | int h = paintDevice.height();
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188 |
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189 | QPainter p( &paintDevice );
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190 | render( plot, &p, QRectF( 0, 0, w, h ) );
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191 | }
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192 |
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193 |
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194 | /*!
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195 | \brief Render the plot to a QPrinter
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196 |
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197 | This function renders the contents of a QwtPolarPlot instance to
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198 | \c QPaintDevice object. The size is derived from the printer
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199 | metrics.
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200 |
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201 | \param plot Plot to be rendered
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202 | \param printer Printer to paint on
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203 |
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204 | \sa renderDocument(), render(), QwtPainter::setRoundingAlignment()
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205 | */
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206 |
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207 | void QwtPolarRenderer::renderTo(
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208 | QwtPolarPlot *plot, QPrinter &printer ) const
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209 | {
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210 | int w = printer.width();
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211 | int h = printer.height();
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212 |
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213 | QRectF rect( 0, 0, w, h );
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214 | double aspect = rect.width() / rect.height();
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215 | if ( ( aspect < 1.0 ) )
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216 | rect.setHeight( aspect * rect.width() );
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217 |
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218 | QPainter p( &printer );
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219 | render( plot, &p, rect );
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220 | }
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221 |
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222 | #ifndef QWT_NO_POLAR_SVG
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223 | #ifdef QT_SVG_LIB
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224 | #if QT_VERSION >= 0x040500
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225 |
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226 | /*!
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227 | \brief Render the plot to a QSvgGenerator
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228 |
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229 | If the generator has a view box, the plot will be rendered into it.
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230 | If it has no viewBox but a valid size the target coordinates
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231 | will be (0, 0, generator.width(), generator.height()). Otherwise
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232 | the target rectangle will be QRectF(0, 0, 800, 600);
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233 |
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234 | \param plot Plot to be rendered
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235 | \param generator SVG generator
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236 | */
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237 | void QwtPolarRenderer::renderTo(
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238 | QwtPolarPlot *plot, QSvgGenerator &generator ) const
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239 | {
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240 | QRectF rect = generator.viewBoxF();
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241 | if ( rect.isEmpty() )
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242 | rect.setRect( 0, 0, generator.width(), generator.height() );
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243 |
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244 | if ( rect.isEmpty() )
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245 | rect.setRect( 0, 0, 800, 600 ); // something
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246 |
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247 | QPainter p( &generator );
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248 | render( plot, &p, rect );
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249 | }
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250 | #endif
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251 | #endif
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252 | #endif
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253 |
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254 | /*!
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255 | \brief Render the plot to a given rectangle ( f.e QPrinter, QSvgRenderer )
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256 |
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257 | \param plot Plot widget to be rendered
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258 | \param painter Painter
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259 | \param plotRect Bounding rectangle for the plot
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260 | */
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261 | void QwtPolarRenderer::render( QwtPolarPlot *plot,
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262 | QPainter *painter, const QRectF &plotRect ) const
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263 | {
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264 | if ( plot == NULL || painter == NULL || !painter->isActive() ||
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265 | !plotRect.isValid() || plot->size().isNull() )
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266 | {
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267 | return;
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268 | }
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269 |
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270 | d_data->plot = plot;
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271 |
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272 | /*
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273 | The layout engine uses the same methods as they are used
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274 | by the Qt layout system. Therefore we need to calculate the
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275 | layout in screen coordinates and paint with a scaled painter.
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276 | */
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277 | QTransform transform;
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278 | transform.scale(
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279 | double( painter->device()->logicalDpiX() ) / plot->logicalDpiX(),
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280 | double( painter->device()->logicalDpiY() ) / plot->logicalDpiY() );
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281 |
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282 | const QRectF layoutRect = transform.inverted().mapRect( plotRect );
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283 |
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284 | QwtPolarLayout *layout = plot->plotLayout();
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285 |
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286 | // All paint operations need to be scaled according to
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287 | // the paint device metrics.
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288 |
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289 | QwtPolarLayout::Options layoutOptions =
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290 | QwtPolarLayout::IgnoreScrollbars | QwtPolarLayout::IgnoreFrames;
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291 |
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292 | layout->activate( plot, layoutRect, layoutOptions );
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293 |
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294 | painter->save();
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295 | painter->setWorldTransform( transform, true );
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296 |
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297 | painter->save();
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298 | renderTitle( painter, layout->titleRect() );
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299 | painter->restore();
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300 |
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301 | painter->save();
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302 | renderLegend( painter, layout->legendRect() );
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303 | painter->restore();
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304 |
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305 | const QRectF canvasRect = layout->canvasRect();
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306 |
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307 | painter->save();
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308 | painter->setClipRect( canvasRect );
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309 | plot->drawCanvas( painter, canvasRect );
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310 | painter->restore();
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311 |
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312 | painter->restore();
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313 |
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314 | layout->invalidate();
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315 |
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316 | d_data->plot = NULL;
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317 | }
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318 |
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319 | /*!
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320 | Render the title into a given rectangle.
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321 |
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322 | \param painter Painter
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323 | \param rect Bounding rectangle
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324 | */
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325 |
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326 | void QwtPolarRenderer::renderTitle( QPainter *painter, const QRectF &rect ) const
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327 | {
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328 | QwtTextLabel *title = d_data->plot->titleLabel();
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329 |
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330 | painter->setFont( title->font() );
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331 |
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332 | const QColor color = title->palette().color(
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333 | QPalette::Active, QPalette::Text );
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334 |
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335 | painter->setPen( color );
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336 | title->text().draw( painter, rect );
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337 | }
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338 |
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339 | /*!
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340 | Render the legend into a given rectangle.
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341 |
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342 | \param painter Painter
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343 | \param rect Bounding rectangle
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344 | */
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345 |
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346 | void QwtPolarRenderer::renderLegend(
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347 | QPainter *painter, const QRectF &rect ) const
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348 | {
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349 | QwtLegend *legend = d_data->plot->legend();
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350 | if ( legend == NULL || legend->isEmpty() )
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351 | return;
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352 |
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353 | const QwtDynGridLayout *legendLayout = qobject_cast<QwtDynGridLayout *>(
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354 | legend->contentsWidget()->layout() );
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355 | if ( legendLayout == NULL )
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356 | return;
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357 |
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358 | uint numCols = legendLayout->columnsForWidth( rect.width() );
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359 | const QList<QRect> itemRects =
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360 | legendLayout->layoutItems( rect.toRect(), numCols );
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361 |
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362 | int index = 0;
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363 |
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364 | for ( int i = 0; i < legendLayout->count(); i++ )
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365 | {
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366 | QLayoutItem *item = legendLayout->itemAt( i );
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367 | QWidget *w = item->widget();
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368 | if ( w )
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369 | {
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370 | painter->save();
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371 |
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372 | painter->setClipRect( itemRects[index] );
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373 | renderLegendItem( painter, w, itemRects[index] );
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374 |
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375 | index++;
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376 | painter->restore();
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377 | }
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378 | }
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379 |
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380 | }
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381 |
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382 | /*!
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383 | Print the legend item into a given rectangle.
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384 |
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385 | \param painter Painter
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386 | \param widget Widget representing a legend item
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387 | \param rect Bounding rectangle
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388 |
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389 | \note When widget is not derived from QwtLegendItem renderLegendItem
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390 | does nothing and needs to be overloaded
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391 | */
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392 | void QwtPolarRenderer::renderLegendItem( QPainter *painter,
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393 | const QWidget *widget, const QRectF &rect ) const
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394 | {
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395 | const QwtLegendItem *item = qobject_cast<const QwtLegendItem *>( widget );
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396 | if ( item )
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397 | {
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398 | const QSize sz = item->identifierSize();
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399 |
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400 | const QRectF identifierRect( rect.x() + item->margin(),
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401 | rect.center().y() - 0.5 * sz.height(), sz.width(), sz.height() );
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402 |
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403 | QwtLegendItemManager *itemManger = d_data->plot->legend()->find( item );
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404 | if ( itemManger )
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405 | {
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406 | painter->save();
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407 | painter->setClipRect( identifierRect, Qt::IntersectClip );
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408 | itemManger->drawLegendIdentifier( painter, identifierRect );
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409 | painter->restore();
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410 | }
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411 |
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412 | // Label
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413 |
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414 | QRectF titleRect = rect;
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415 | titleRect.setX( identifierRect.right() + 2 * item->spacing() );
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416 |
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417 | painter->setFont( item->font() );
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418 | item->text().draw( painter, titleRect );
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419 | }
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420 | }
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421 |
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