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_plot_curve.h"
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11 | #include "qwt_math.h"
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12 | #include "qwt_clipper.h"
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13 | #include "qwt_painter.h"
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14 | #include "qwt_legend.h"
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15 | #include "qwt_legend_item.h"
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16 | #include "qwt_scale_map.h"
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17 | #include "qwt_plot.h"
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18 | #include "qwt_plot_canvas.h"
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19 | #include "qwt_curve_fitter.h"
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20 | #include "qwt_symbol.h"
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21 | #include <qpainter.h>
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22 | #include <qpixmap.h>
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23 | #include <qalgorithms.h>
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24 | #include <qmath.h>
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25 |
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26 | static int verifyRange( int size, int &i1, int &i2 )
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27 | {
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28 | if ( size < 1 )
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29 | return 0;
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30 |
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31 | i1 = qBound( 0, i1, size - 1 );
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32 | i2 = qBound( 0, i2, size - 1 );
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33 |
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34 | if ( i1 > i2 )
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35 | qSwap( i1, i2 );
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36 |
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37 | return ( i2 - i1 + 1 );
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38 | }
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39 |
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40 | class QwtPlotCurve::PrivateData
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41 | {
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42 | public:
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43 | PrivateData():
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44 | style( QwtPlotCurve::Lines ),
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45 | baseline( 0.0 ),
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46 | symbol( NULL ),
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47 | attributes( 0 ),
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48 | paintAttributes( QwtPlotCurve::ClipPolygons ),
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49 | legendAttributes( 0 )
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50 | {
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51 | pen = QPen( Qt::black );
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52 | curveFitter = new QwtSplineCurveFitter;
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53 | }
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54 |
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55 | ~PrivateData()
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56 | {
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57 | delete symbol;
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58 | delete curveFitter;
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59 | }
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60 |
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61 | QwtPlotCurve::CurveStyle style;
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62 | double baseline;
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63 |
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64 | const QwtSymbol *symbol;
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65 | QwtCurveFitter *curveFitter;
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66 |
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67 | QPen pen;
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68 | QBrush brush;
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69 |
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70 | QwtPlotCurve::CurveAttributes attributes;
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71 | QwtPlotCurve::PaintAttributes paintAttributes;
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72 |
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73 | QwtPlotCurve::LegendAttributes legendAttributes;
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74 | };
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75 |
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76 | /*!
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77 | Constructor
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78 | \param title Title of the curve
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79 | */
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80 | QwtPlotCurve::QwtPlotCurve( const QwtText &title ):
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81 | QwtPlotSeriesItem<QPointF>( title )
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82 | {
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83 | init();
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84 | }
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85 |
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86 | /*!
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87 | Constructor
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88 | \param title Title of the curve
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89 | */
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90 | QwtPlotCurve::QwtPlotCurve( const QString &title ):
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91 | QwtPlotSeriesItem<QPointF>( QwtText( title ) )
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92 | {
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93 | init();
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94 | }
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95 |
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96 | //! Destructor
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97 | QwtPlotCurve::~QwtPlotCurve()
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98 | {
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99 | delete d_data;
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100 | }
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101 |
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102 | //! Initialize internal members
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103 | void QwtPlotCurve::init()
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104 | {
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105 | setItemAttribute( QwtPlotItem::Legend );
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106 | setItemAttribute( QwtPlotItem::AutoScale );
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107 |
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108 | d_data = new PrivateData;
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109 | d_series = new QwtPointSeriesData();
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110 |
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111 | setZ( 20.0 );
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112 | }
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113 |
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114 | //! \return QwtPlotItem::Rtti_PlotCurve
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115 | int QwtPlotCurve::rtti() const
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116 | {
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117 | return QwtPlotItem::Rtti_PlotCurve;
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118 | }
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119 |
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120 | /*!
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121 | Specify an attribute how to draw the curve
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122 |
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123 | \param attribute Paint attribute
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124 | \param on On/Off
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125 | \sa testPaintAttribute()
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126 | */
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127 | void QwtPlotCurve::setPaintAttribute( PaintAttribute attribute, bool on )
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128 | {
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129 | if ( on )
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130 | d_data->paintAttributes |= attribute;
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131 | else
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132 | d_data->paintAttributes &= ~attribute;
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133 | }
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134 |
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135 | /*!
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136 | \brief Return the current paint attributes
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137 | \sa setPaintAttribute()
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138 | */
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139 | bool QwtPlotCurve::testPaintAttribute( PaintAttribute attribute ) const
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140 | {
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141 | return ( d_data->paintAttributes & attribute );
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142 | }
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143 |
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144 | /*!
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145 | Specify an attribute how to draw the legend identifier
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146 |
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147 | \param attribute Attribute
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148 | \param on On/Off
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149 | /sa testLegendAttribute()
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150 | */
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151 | void QwtPlotCurve::setLegendAttribute( LegendAttribute attribute, bool on )
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152 | {
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153 | if ( on )
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154 | d_data->legendAttributes |= attribute;
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155 | else
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156 | d_data->legendAttributes &= ~attribute;
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157 | }
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158 |
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159 | /*!
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160 | \brief Return the current paint attributes
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161 | \sa setLegendAttribute()
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162 | */
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163 | bool QwtPlotCurve::testLegendAttribute( LegendAttribute attribute ) const
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164 | {
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165 | return ( d_data->legendAttributes & attribute );
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166 | }
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167 |
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168 | /*!
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169 | Set the curve's drawing style
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170 |
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171 | \param style Curve style
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172 | \sa style()
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173 | */
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174 | void QwtPlotCurve::setStyle( CurveStyle style )
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175 | {
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176 | if ( style != d_data->style )
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177 | {
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178 | d_data->style = style;
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179 | itemChanged();
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180 | }
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181 | }
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182 |
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183 | /*!
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184 | Return the current style
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185 | \sa setStyle()
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186 | */
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187 | QwtPlotCurve::CurveStyle QwtPlotCurve::style() const
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188 | {
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189 | return d_data->style;
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190 | }
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191 |
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192 | /*!
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193 | Assign a symbol
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194 |
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195 | \param symbol Symbol
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196 | \sa symbol()
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197 | */
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198 | void QwtPlotCurve::setSymbol( const QwtSymbol *symbol )
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199 | {
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200 | if ( symbol != d_data->symbol )
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201 | {
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202 | delete d_data->symbol;
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203 | d_data->symbol = symbol;
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204 | itemChanged();
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205 | }
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206 | }
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207 |
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208 | /*!
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209 | \return Current symbol or NULL, when no symbol has been assigned
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210 | \sa setSymbol()
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211 | */
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212 | const QwtSymbol *QwtPlotCurve::symbol() const
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213 | {
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214 | return d_data->symbol;
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215 | }
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216 |
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217 | /*!
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218 | Assign a pen
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219 |
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220 | \param pen New pen
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221 | \sa pen(), brush()
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222 | */
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223 | void QwtPlotCurve::setPen( const QPen &pen )
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224 | {
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225 | if ( pen != d_data->pen )
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226 | {
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227 | d_data->pen = pen;
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228 | itemChanged();
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229 | }
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230 | }
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231 |
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232 | /*!
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233 | \return Pen used to draw the lines
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234 | \sa setPen(), brush()
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235 | */
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236 | const QPen& QwtPlotCurve::pen() const
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237 | {
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238 | return d_data->pen;
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239 | }
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240 |
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241 | /*!
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242 | \brief Assign a brush.
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243 |
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244 | In case of brush.style() != QBrush::NoBrush
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245 | and style() != QwtPlotCurve::Sticks
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246 | the area between the curve and the baseline will be filled.
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247 |
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248 | In case !brush.color().isValid() the area will be filled by
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249 | pen.color(). The fill algorithm simply connects the first and the
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250 | last curve point to the baseline. So the curve data has to be sorted
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251 | (ascending or descending).
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252 |
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253 | \param brush New brush
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254 | \sa brush(), setBaseline(), baseline()
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255 | */
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256 | void QwtPlotCurve::setBrush( const QBrush &brush )
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257 | {
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258 | if ( brush != d_data->brush )
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259 | {
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260 | d_data->brush = brush;
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261 | itemChanged();
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262 | }
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263 | }
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264 |
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265 | /*!
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266 | \return Brush used to fill the area between lines and the baseline
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267 | \sa setBrush(), setBaseline(), baseline()
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268 | */
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269 | const QBrush& QwtPlotCurve::brush() const
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270 | {
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271 | return d_data->brush;
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272 | }
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273 |
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274 | /*!
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275 | Draw an interval of the curve
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276 |
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277 | \param painter Painter
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278 | \param xMap Maps x-values into pixel coordinates.
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279 | \param yMap Maps y-values into pixel coordinates.
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280 | \param canvasRect Contents rect of the canvas
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281 | \param from Index of the first point to be painted
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282 | \param to Index of the last point to be painted. If to < 0 the
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283 | curve will be painted to its last point.
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284 |
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285 | \sa drawCurve(), drawSymbols(),
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286 | */
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287 | void QwtPlotCurve::drawSeries( QPainter *painter,
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288 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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289 | const QRectF &canvasRect, int from, int to ) const
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290 | {
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291 | if ( !painter || dataSize() <= 0 )
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292 | return;
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293 |
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294 | if ( to < 0 )
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295 | to = dataSize() - 1;
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296 |
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297 | if ( verifyRange( dataSize(), from, to ) > 0 )
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298 | {
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299 | painter->save();
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300 | painter->setPen( d_data->pen );
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301 |
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302 | /*
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303 | Qt 4.0.0 is slow when drawing lines, but it's even
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304 | slower when the painter has a brush. So we don't
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305 | set the brush before we really need it.
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306 | */
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307 |
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308 | drawCurve( painter, d_data->style, xMap, yMap, canvasRect, from, to );
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309 | painter->restore();
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310 |
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311 | if ( d_data->symbol &&
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312 | ( d_data->symbol->style() != QwtSymbol::NoSymbol ) )
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313 | {
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314 | painter->save();
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315 | drawSymbols( painter, *d_data->symbol,
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316 | xMap, yMap, canvasRect, from, to );
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317 | painter->restore();
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318 | }
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319 | }
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320 | }
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321 |
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322 | /*!
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323 | \brief Draw the line part (without symbols) of a curve interval.
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324 | \param painter Painter
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325 | \param style curve style, see QwtPlotCurve::CurveStyle
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326 | \param xMap x map
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327 | \param yMap y map
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328 | \param canvasRect Contents rect of the canvas
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329 | \param from index of the first point to be painted
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330 | \param to index of the last point to be painted
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331 | \sa draw(), drawDots(), drawLines(), drawSteps(), drawSticks()
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332 | */
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333 | void QwtPlotCurve::drawCurve( QPainter *painter, int style,
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334 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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335 | const QRectF &canvasRect, int from, int to ) const
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336 | {
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337 | switch ( style )
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338 | {
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339 | case Lines:
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340 | if ( testCurveAttribute( Fitted ) )
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341 | {
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342 | // we always need the complete
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343 | // curve for fitting
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344 | from = 0;
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345 | to = dataSize() - 1;
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346 | }
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347 | drawLines( painter, xMap, yMap, canvasRect, from, to );
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348 | break;
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349 | case Sticks:
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350 | drawSticks( painter, xMap, yMap, canvasRect, from, to );
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351 | break;
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352 | case Steps:
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353 | drawSteps( painter, xMap, yMap, canvasRect, from, to );
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354 | break;
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355 | case Dots:
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356 | drawDots( painter, xMap, yMap, canvasRect, from, to );
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357 | break;
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358 | case NoCurve:
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359 | default:
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360 | break;
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361 | }
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362 | }
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363 |
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364 | /*!
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365 | \brief Draw lines
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366 |
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367 | If the CurveAttribute Fitted is enabled a QwtCurveFitter tries
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368 | to interpolate/smooth the curve, before it is painted.
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369 |
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370 | \param painter Painter
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371 | \param xMap x map
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372 | \param yMap y map
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373 | \param canvasRect Contents rect of the canvas
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374 | \param from index of the first point to be painted
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375 | \param to index of the last point to be painted
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376 |
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377 | \sa setCurveAttribute(), setCurveFitter(), draw(),
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378 | drawLines(), drawDots(), drawSteps(), drawSticks()
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379 | */
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380 | void QwtPlotCurve::drawLines( QPainter *painter,
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381 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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382 | const QRectF &canvasRect, int from, int to ) const
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383 | {
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384 | int size = to - from + 1;
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385 | if ( size <= 0 )
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386 | return;
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387 |
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388 | const bool doAlign = QwtPainter::roundingAlignment( painter );
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389 |
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390 | QPolygonF polyline( size );
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391 |
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392 | QPointF *points = polyline.data();
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393 | for ( int i = from; i <= to; i++ )
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394 | {
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395 | const QPointF sample = d_series->sample( i );
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396 |
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397 | double x = xMap.transform( sample.x() );
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398 | double y = yMap.transform( sample.y() );
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399 | if ( doAlign )
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400 | {
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401 | x = qRound( x );
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402 | y = qRound( y );
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403 | }
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404 |
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405 | points[i - from].rx() = x;
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406 | points[i - from].ry() = y;
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407 | }
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408 |
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409 | if ( ( d_data->attributes & Fitted ) && d_data->curveFitter )
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410 | polyline = d_data->curveFitter->fitCurve( polyline );
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411 |
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412 | if ( d_data->paintAttributes & ClipPolygons )
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413 | {
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414 | qreal pw = qMax( qreal( 1.0 ), painter->pen().widthF());
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415 | const QPolygonF clipped = QwtClipper::clipPolygonF(
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416 | canvasRect.adjusted(-pw, -pw, pw, pw), polyline, false );
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417 |
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418 | QwtPainter::drawPolyline( painter, clipped );
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419 | }
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420 | else
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421 | {
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422 | QwtPainter::drawPolyline( painter, polyline );
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423 | }
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424 |
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425 | if ( d_data->brush.style() != Qt::NoBrush )
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426 | fillCurve( painter, xMap, yMap, canvasRect, polyline );
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427 | }
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428 |
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429 | /*!
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430 | Draw sticks
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431 |
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432 | \param painter Painter
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433 | \param xMap x map
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434 | \param yMap y map
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435 | \param canvasRect Contents rect of the canvas
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436 | \param from index of the first point to be painted
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437 | \param to index of the last point to be painted
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438 |
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439 | \sa draw(), drawCurve(), drawDots(), drawLines(), drawSteps()
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440 | */
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441 | void QwtPlotCurve::drawSticks( QPainter *painter,
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442 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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443 | const QRectF &, int from, int to ) const
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444 | {
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445 | painter->save();
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446 | painter->setRenderHint( QPainter::Antialiasing, false );
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447 |
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448 | const bool doAlign = QwtPainter::roundingAlignment( painter );
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449 |
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450 | double x0 = xMap.transform( d_data->baseline );
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451 | double y0 = yMap.transform( d_data->baseline );
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452 | if ( doAlign )
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453 | {
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454 | x0 = qRound( x0 );
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455 | y0 = qRound( y0 );
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456 | }
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457 |
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458 | const Qt::Orientation o = orientation();
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459 |
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460 | for ( int i = from; i <= to; i++ )
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461 | {
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462 | const QPointF sample = d_series->sample( i );
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463 | double xi = xMap.transform( sample.x() );
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464 | double yi = yMap.transform( sample.y() );
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465 | if ( doAlign )
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466 | {
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467 | xi = qRound( xi );
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468 | yi = qRound( yi );
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469 | }
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470 |
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471 | if ( o == Qt::Horizontal )
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472 | QwtPainter::drawLine( painter, x0, yi, xi, yi );
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473 | else
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474 | QwtPainter::drawLine( painter, xi, y0, xi, yi );
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475 | }
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476 |
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477 | painter->restore();
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478 | }
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479 |
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480 | /*!
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481 | Draw dots
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482 |
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483 | \param painter Painter
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484 | \param xMap x map
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485 | \param yMap y map
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486 | \param canvasRect Contents rect of the canvas
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487 | \param from index of the first point to be painted
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488 | \param to index of the last point to be painted
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489 |
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490 | \sa draw(), drawCurve(), drawSticks(), drawLines(), drawSteps()
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491 | */
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492 | void QwtPlotCurve::drawDots( QPainter *painter,
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493 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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494 | const QRectF &canvasRect, int from, int to ) const
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495 | {
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496 | const bool doFill = d_data->brush.style() != Qt::NoBrush;
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497 | const bool doAlign = QwtPainter::roundingAlignment( painter );
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498 |
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499 | QPolygonF polyline;
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500 | if ( doFill )
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501 | polyline.resize( to - from + 1 );
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502 |
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503 | QPointF *points = polyline.data();
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---|
504 |
|
---|
505 | for ( int i = from; i <= to; i++ )
|
---|
506 | {
|
---|
507 | const QPointF sample = d_series->sample( i );
|
---|
508 | double xi = xMap.transform( sample.x() );
|
---|
509 | double yi = yMap.transform( sample.y() );
|
---|
510 | if ( doAlign )
|
---|
511 | {
|
---|
512 | xi = qRound( xi );
|
---|
513 | yi = qRound( yi );
|
---|
514 | }
|
---|
515 |
|
---|
516 | QwtPainter::drawPoint( painter, QPointF( xi, yi ) );
|
---|
517 |
|
---|
518 | if ( doFill )
|
---|
519 | {
|
---|
520 | points[i - from].rx() = xi;
|
---|
521 | points[i - from].ry() = yi;
|
---|
522 | }
|
---|
523 | }
|
---|
524 |
|
---|
525 | if ( doFill )
|
---|
526 | fillCurve( painter, xMap, yMap, canvasRect, polyline );
|
---|
527 | }
|
---|
528 |
|
---|
529 | /*!
|
---|
530 | Draw step function
|
---|
531 |
|
---|
532 | The direction of the steps depends on Inverted attribute.
|
---|
533 |
|
---|
534 | \param painter Painter
|
---|
535 | \param xMap x map
|
---|
536 | \param yMap y map
|
---|
537 | \param canvasRect Contents rect of the canvas
|
---|
538 | \param from index of the first point to be painted
|
---|
539 | \param to index of the last point to be painted
|
---|
540 |
|
---|
541 | \sa CurveAttribute, setCurveAttribute(),
|
---|
542 | draw(), drawCurve(), drawDots(), drawLines(), drawSticks()
|
---|
543 | */
|
---|
544 | void QwtPlotCurve::drawSteps( QPainter *painter,
|
---|
545 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
|
---|
546 | const QRectF &canvasRect, int from, int to ) const
|
---|
547 | {
|
---|
548 | const bool doAlign = QwtPainter::roundingAlignment( painter );
|
---|
549 |
|
---|
550 | QPolygonF polygon( 2 * ( to - from ) + 1 );
|
---|
551 | QPointF *points = polygon.data();
|
---|
552 |
|
---|
553 | bool inverted = orientation() == Qt::Vertical;
|
---|
554 | if ( d_data->attributes & Inverted )
|
---|
555 | inverted = !inverted;
|
---|
556 |
|
---|
557 | int i, ip;
|
---|
558 | for ( i = from, ip = 0; i <= to; i++, ip += 2 )
|
---|
559 | {
|
---|
560 | const QPointF sample = d_series->sample( i );
|
---|
561 | double xi = xMap.transform( sample.x() );
|
---|
562 | double yi = yMap.transform( sample.y() );
|
---|
563 | if ( doAlign )
|
---|
564 | {
|
---|
565 | xi = qRound( xi );
|
---|
566 | yi = qRound( yi );
|
---|
567 | }
|
---|
568 |
|
---|
569 | if ( ip > 0 )
|
---|
570 | {
|
---|
571 | const QPointF &p0 = points[ip - 2];
|
---|
572 | QPointF &p = points[ip - 1];
|
---|
573 |
|
---|
574 | if ( inverted )
|
---|
575 | {
|
---|
576 | p.rx() = p0.x();
|
---|
577 | p.ry() = yi;
|
---|
578 | }
|
---|
579 | else
|
---|
580 | {
|
---|
581 | p.rx() = xi;
|
---|
582 | p.ry() = p0.y();
|
---|
583 | }
|
---|
584 | }
|
---|
585 |
|
---|
586 | points[ip].rx() = xi;
|
---|
587 | points[ip].ry() = yi;
|
---|
588 | }
|
---|
589 |
|
---|
590 | if ( d_data->paintAttributes & ClipPolygons )
|
---|
591 | {
|
---|
592 | const QPolygonF clipped = QwtClipper::clipPolygonF(
|
---|
593 | canvasRect, polygon, false );
|
---|
594 |
|
---|
595 | QwtPainter::drawPolyline( painter, clipped );
|
---|
596 | }
|
---|
597 | else
|
---|
598 | {
|
---|
599 | QwtPainter::drawPolyline( painter, polygon );
|
---|
600 | }
|
---|
601 |
|
---|
602 | if ( d_data->brush.style() != Qt::NoBrush )
|
---|
603 | fillCurve( painter, xMap, yMap, canvasRect, polygon );
|
---|
604 | }
|
---|
605 |
|
---|
606 |
|
---|
607 | /*!
|
---|
608 | Specify an attribute for drawing the curve
|
---|
609 |
|
---|
610 | \param attribute Curve attribute
|
---|
611 | \param on On/Off
|
---|
612 |
|
---|
613 | /sa testCurveAttribute(), setCurveFitter()
|
---|
614 | */
|
---|
615 | void QwtPlotCurve::setCurveAttribute( CurveAttribute attribute, bool on )
|
---|
616 | {
|
---|
617 | if ( bool( d_data->attributes & attribute ) == on )
|
---|
618 | return;
|
---|
619 |
|
---|
620 | if ( on )
|
---|
621 | d_data->attributes |= attribute;
|
---|
622 | else
|
---|
623 | d_data->attributes &= ~attribute;
|
---|
624 |
|
---|
625 | itemChanged();
|
---|
626 | }
|
---|
627 |
|
---|
628 | /*!
|
---|
629 | \return true, if attribute is enabled
|
---|
630 | \sa setCurveAttribute()
|
---|
631 | */
|
---|
632 | bool QwtPlotCurve::testCurveAttribute( CurveAttribute attribute ) const
|
---|
633 | {
|
---|
634 | return d_data->attributes & attribute;
|
---|
635 | }
|
---|
636 |
|
---|
637 | /*!
|
---|
638 | Assign a curve fitter
|
---|
639 |
|
---|
640 | The curve fitter "smooths" the curve points, when the Fitted
|
---|
641 | CurveAttribute is set. setCurveFitter(NULL) also disables curve fitting.
|
---|
642 |
|
---|
643 | The curve fitter operates on the translated points ( = widget coordinates)
|
---|
644 | to be functional for logarithmic scales. Obviously this is less performant
|
---|
645 | for fitting algorithms, that reduce the number of points.
|
---|
646 |
|
---|
647 | For situations, where curve fitting is used to improve the performance
|
---|
648 | of painting huge series of points it might be better to execute the fitter
|
---|
649 | on the curve points once and to cache the result in the QwtSeriesData object.
|
---|
650 |
|
---|
651 | \param curveFitter() Curve fitter
|
---|
652 | \sa Fitted
|
---|
653 | */
|
---|
654 | void QwtPlotCurve::setCurveFitter( QwtCurveFitter *curveFitter )
|
---|
655 | {
|
---|
656 | delete d_data->curveFitter;
|
---|
657 | d_data->curveFitter = curveFitter;
|
---|
658 |
|
---|
659 | itemChanged();
|
---|
660 | }
|
---|
661 |
|
---|
662 | /*!
|
---|
663 | Get the curve fitter. If curve fitting is disabled NULL is returned.
|
---|
664 |
|
---|
665 | \return Curve fitter
|
---|
666 | \sa setCurveFitter(), Fitted
|
---|
667 | */
|
---|
668 | QwtCurveFitter *QwtPlotCurve::curveFitter() const
|
---|
669 | {
|
---|
670 | return d_data->curveFitter;
|
---|
671 | }
|
---|
672 |
|
---|
673 | /*!
|
---|
674 | Fill the area between the curve and the baseline with
|
---|
675 | the curve brush
|
---|
676 |
|
---|
677 | \param painter Painter
|
---|
678 | \param xMap x map
|
---|
679 | \param yMap y map
|
---|
680 | \param canvasRect Contents rect of the canvas
|
---|
681 | \param polygon Polygon - will be modified !
|
---|
682 |
|
---|
683 | \sa setBrush(), setBaseline(), setStyle()
|
---|
684 | */
|
---|
685 | void QwtPlotCurve::fillCurve( QPainter *painter,
|
---|
686 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
|
---|
687 | const QRectF &canvasRect, QPolygonF &polygon ) const
|
---|
688 | {
|
---|
689 | if ( d_data->brush.style() == Qt::NoBrush )
|
---|
690 | return;
|
---|
691 |
|
---|
692 | closePolyline( painter, xMap, yMap, polygon );
|
---|
693 | if ( polygon.count() <= 2 ) // a line can't be filled
|
---|
694 | return;
|
---|
695 |
|
---|
696 | QBrush brush = d_data->brush;
|
---|
697 | if ( !brush.color().isValid() )
|
---|
698 | brush.setColor( d_data->pen.color() );
|
---|
699 |
|
---|
700 | if ( d_data->paintAttributes & ClipPolygons )
|
---|
701 | polygon = QwtClipper::clipPolygonF( canvasRect, polygon, true );
|
---|
702 |
|
---|
703 | painter->save();
|
---|
704 |
|
---|
705 | painter->setPen( Qt::NoPen );
|
---|
706 | painter->setBrush( brush );
|
---|
707 |
|
---|
708 | QwtPainter::drawPolygon( painter, polygon );
|
---|
709 |
|
---|
710 | painter->restore();
|
---|
711 | }
|
---|
712 |
|
---|
713 | /*!
|
---|
714 | \brief Complete a polygon to be a closed polygon including the
|
---|
715 | area between the original polygon and the baseline.
|
---|
716 |
|
---|
717 | \param painter Painter
|
---|
718 | \param xMap X map
|
---|
719 | \param yMap Y map
|
---|
720 | \param polygon Polygon to be completed
|
---|
721 | */
|
---|
722 | void QwtPlotCurve::closePolyline( QPainter *painter,
|
---|
723 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
|
---|
724 | QPolygonF &polygon ) const
|
---|
725 | {
|
---|
726 | if ( polygon.size() < 2 )
|
---|
727 | return;
|
---|
728 |
|
---|
729 | const bool doAlign = QwtPainter::roundingAlignment( painter );
|
---|
730 |
|
---|
731 | double baseline = d_data->baseline;
|
---|
732 |
|
---|
733 | if ( orientation() == Qt::Vertical )
|
---|
734 | {
|
---|
735 | if ( yMap.transformation()->type() == QwtScaleTransformation::Log10 )
|
---|
736 | {
|
---|
737 | if ( baseline < QwtScaleMap::LogMin )
|
---|
738 | baseline = QwtScaleMap::LogMin;
|
---|
739 | }
|
---|
740 |
|
---|
741 | double refY = yMap.transform( baseline );
|
---|
742 | if ( doAlign )
|
---|
743 | refY = qRound( refY );
|
---|
744 |
|
---|
745 | polygon += QPointF( polygon.last().x(), refY );
|
---|
746 | polygon += QPointF( polygon.first().x(), refY );
|
---|
747 | }
|
---|
748 | else
|
---|
749 | {
|
---|
750 | if ( xMap.transformation()->type() == QwtScaleTransformation::Log10 )
|
---|
751 | {
|
---|
752 | if ( baseline < QwtScaleMap::LogMin )
|
---|
753 | baseline = QwtScaleMap::LogMin;
|
---|
754 | }
|
---|
755 |
|
---|
756 | double refX = xMap.transform( baseline );
|
---|
757 | if ( doAlign )
|
---|
758 | refX = qRound( refX );
|
---|
759 |
|
---|
760 | polygon += QPointF( refX, polygon.last().y() );
|
---|
761 | polygon += QPointF( refX, polygon.first().y() );
|
---|
762 | }
|
---|
763 | }
|
---|
764 |
|
---|
765 | /*!
|
---|
766 | Draw symbols
|
---|
767 |
|
---|
768 | \param painter Painter
|
---|
769 | \param symbol Curve symbol
|
---|
770 | \param xMap x map
|
---|
771 | \param yMap y map
|
---|
772 | \param canvasRect Contents rect of the canvas
|
---|
773 | \param from Index of the first point to be painted
|
---|
774 | \param to Index of the last point to be painted
|
---|
775 |
|
---|
776 | \sa setSymbol(), drawSeries(), drawCurve()
|
---|
777 | */
|
---|
778 | void QwtPlotCurve::drawSymbols( QPainter *painter, const QwtSymbol &symbol,
|
---|
779 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
|
---|
780 | const QRectF &canvasRect, int from, int to ) const
|
---|
781 | {
|
---|
782 | const bool doAlign = QwtPainter::roundingAlignment( painter );
|
---|
783 |
|
---|
784 | bool usePixmap = testPaintAttribute( CacheSymbols );
|
---|
785 | if ( usePixmap && !doAlign )
|
---|
786 | {
|
---|
787 | // Don't use the pixmap, when the paint device
|
---|
788 | // could generate scalable vectors
|
---|
789 |
|
---|
790 | usePixmap = false;
|
---|
791 | }
|
---|
792 |
|
---|
793 | if ( usePixmap )
|
---|
794 | {
|
---|
795 | QPixmap pm( symbol.boundingSize() );
|
---|
796 | pm.fill( Qt::transparent );
|
---|
797 |
|
---|
798 | const double pw2 = 0.5 * pm.width();
|
---|
799 | const double ph2 = 0.5 * pm.height();
|
---|
800 |
|
---|
801 | QPainter p( &pm );
|
---|
802 | p.setRenderHints( painter->renderHints() );
|
---|
803 | symbol.drawSymbol( &p, QPointF( pw2, ph2 ) );
|
---|
804 | p.end();
|
---|
805 |
|
---|
806 | for ( int i = from; i <= to; i++ )
|
---|
807 | {
|
---|
808 | const QPointF sample = d_series->sample( i );
|
---|
809 |
|
---|
810 | double xi = xMap.transform( sample.x() );
|
---|
811 | double yi = yMap.transform( sample.y() );
|
---|
812 | if ( doAlign )
|
---|
813 | {
|
---|
814 | xi = qRound( xi );
|
---|
815 | yi = qRound( yi );
|
---|
816 | }
|
---|
817 |
|
---|
818 | if ( canvasRect.contains( xi, yi ) )
|
---|
819 | {
|
---|
820 | const int left = qCeil( xi ) - pw2;
|
---|
821 | const int top = qCeil( yi ) - ph2;
|
---|
822 |
|
---|
823 | painter->drawPixmap( left, top, pm );
|
---|
824 | }
|
---|
825 | }
|
---|
826 | }
|
---|
827 | else
|
---|
828 | {
|
---|
829 | const int chunkSize = 500;
|
---|
830 |
|
---|
831 | for ( int i = from; i <= to; i += chunkSize )
|
---|
832 | {
|
---|
833 | const int n = qMin( chunkSize, to - i + 1 );
|
---|
834 |
|
---|
835 | QPolygonF points;
|
---|
836 | for ( int j = 0; j < n; j++ )
|
---|
837 | {
|
---|
838 | const QPointF sample = d_series->sample( i + j );
|
---|
839 |
|
---|
840 | const double xi = xMap.transform( sample.x() );
|
---|
841 | const double yi = yMap.transform( sample.y() );
|
---|
842 |
|
---|
843 | if ( canvasRect.contains( xi, yi ) )
|
---|
844 | points += QPointF( xi, yi );
|
---|
845 | }
|
---|
846 |
|
---|
847 | if ( points.size() > 0 )
|
---|
848 | symbol.drawSymbols( painter, points );
|
---|
849 | }
|
---|
850 | }
|
---|
851 | }
|
---|
852 |
|
---|
853 | /*!
|
---|
854 | \brief Set the value of the baseline
|
---|
855 |
|
---|
856 | The baseline is needed for filling the curve with a brush or
|
---|
857 | the Sticks drawing style.
|
---|
858 | The interpretation of the baseline depends on the CurveType.
|
---|
859 | With QwtPlotCurve::Yfx, the baseline is interpreted as a horizontal line
|
---|
860 | at y = baseline(), with QwtPlotCurve::Yfy, it is interpreted as a vertical
|
---|
861 | line at x = baseline().
|
---|
862 |
|
---|
863 | The default value is 0.0.
|
---|
864 |
|
---|
865 | \param value Value of the baseline
|
---|
866 | \sa baseline(), setBrush(), setStyle(), setStyle()
|
---|
867 | */
|
---|
868 | void QwtPlotCurve::setBaseline( double value )
|
---|
869 | {
|
---|
870 | if ( d_data->baseline != value )
|
---|
871 | {
|
---|
872 | d_data->baseline = value;
|
---|
873 | itemChanged();
|
---|
874 | }
|
---|
875 | }
|
---|
876 |
|
---|
877 | /*!
|
---|
878 | \return Value of the baseline
|
---|
879 | \sa setBaseline()
|
---|
880 | */
|
---|
881 | double QwtPlotCurve::baseline() const
|
---|
882 | {
|
---|
883 | return d_data->baseline;
|
---|
884 | }
|
---|
885 |
|
---|
886 | /*!
|
---|
887 | Find the closest curve point for a specific position
|
---|
888 |
|
---|
889 | \param pos Position, where to look for the closest curve point
|
---|
890 | \param dist If dist != NULL, closestPoint() returns the distance between
|
---|
891 | the position and the clostest curve point
|
---|
892 | \return Index of the closest curve point, or -1 if none can be found
|
---|
893 | ( f.e when the curve has no points )
|
---|
894 | \note closestPoint() implements a dumb algorithm, that iterates
|
---|
895 | over all points
|
---|
896 | */
|
---|
897 | int QwtPlotCurve::closestPoint( const QPoint &pos, double *dist ) const
|
---|
898 | {
|
---|
899 | if ( plot() == NULL || dataSize() <= 0 )
|
---|
900 | return -1;
|
---|
901 |
|
---|
902 | const QwtScaleMap xMap = plot()->canvasMap( xAxis() );
|
---|
903 | const QwtScaleMap yMap = plot()->canvasMap( yAxis() );
|
---|
904 |
|
---|
905 | int index = -1;
|
---|
906 | double dmin = 1.0e10;
|
---|
907 |
|
---|
908 | for ( uint i = 0; i < dataSize(); i++ )
|
---|
909 | {
|
---|
910 | const QPointF sample = d_series->sample( i );
|
---|
911 |
|
---|
912 | const double cx = xMap.transform( sample.x() ) - pos.x();
|
---|
913 | const double cy = yMap.transform( sample.y() ) - pos.y();
|
---|
914 |
|
---|
915 | const double f = qwtSqr( cx ) + qwtSqr( cy );
|
---|
916 | if ( f < dmin )
|
---|
917 | {
|
---|
918 | index = i;
|
---|
919 | dmin = f;
|
---|
920 | }
|
---|
921 | }
|
---|
922 | if ( dist )
|
---|
923 | *dist = qSqrt( dmin );
|
---|
924 |
|
---|
925 | return index;
|
---|
926 | }
|
---|
927 |
|
---|
928 | /*!
|
---|
929 | \brief Update the widget that represents the item on the legend
|
---|
930 |
|
---|
931 | \param legend Legend
|
---|
932 | \sa drawLegendIdentifier(), legendItem(), QwtPlotItem::Legend
|
---|
933 | */
|
---|
934 | void QwtPlotCurve::updateLegend( QwtLegend *legend ) const
|
---|
935 | {
|
---|
936 | if ( legend && testItemAttribute( QwtPlotItem::Legend )
|
---|
937 | && ( d_data->legendAttributes & QwtPlotCurve::LegendShowSymbol )
|
---|
938 | && d_data->symbol
|
---|
939 | && d_data->symbol->style() != QwtSymbol::NoSymbol )
|
---|
940 | {
|
---|
941 | QWidget *lgdItem = legend->find( this );
|
---|
942 | if ( lgdItem == NULL )
|
---|
943 | {
|
---|
944 | lgdItem = legendItem();
|
---|
945 | if ( lgdItem )
|
---|
946 | legend->insert( this, lgdItem );
|
---|
947 | }
|
---|
948 |
|
---|
949 | QwtLegendItem *l = qobject_cast<QwtLegendItem *>( lgdItem );
|
---|
950 | if ( l )
|
---|
951 | {
|
---|
952 | QSize sz = d_data->symbol->boundingSize();
|
---|
953 | sz += QSize( 2, 2 ); // margin
|
---|
954 |
|
---|
955 | if ( d_data->legendAttributes & QwtPlotCurve::LegendShowLine )
|
---|
956 | {
|
---|
957 | // Avoid, that the line is completely covered by the symbol
|
---|
958 |
|
---|
959 | int w = qCeil( 1.5 * sz.width() );
|
---|
960 | if ( w % 2 )
|
---|
961 | w++;
|
---|
962 |
|
---|
963 | sz.setWidth( qMax( 8, w ) );
|
---|
964 | }
|
---|
965 |
|
---|
966 | l->setIdentifierSize( sz );
|
---|
967 | }
|
---|
968 | }
|
---|
969 |
|
---|
970 | QwtPlotItem::updateLegend( legend );
|
---|
971 | }
|
---|
972 |
|
---|
973 | /*!
|
---|
974 | \brief Draw the identifier representing the curve on the legend
|
---|
975 |
|
---|
976 | \param painter Painter
|
---|
977 | \param rect Bounding rectangle for the identifier
|
---|
978 |
|
---|
979 | \sa setLegendAttribute(), QwtPlotItem::Legend
|
---|
980 | */
|
---|
981 | void QwtPlotCurve::drawLegendIdentifier(
|
---|
982 | QPainter *painter, const QRectF &rect ) const
|
---|
983 | {
|
---|
984 | if ( rect.isEmpty() )
|
---|
985 | return;
|
---|
986 |
|
---|
987 | const int dim = qMin( rect.width(), rect.height() );
|
---|
988 |
|
---|
989 | QSize size( dim, dim );
|
---|
990 |
|
---|
991 | QRectF r( 0, 0, size.width(), size.height() );
|
---|
992 | r.moveCenter( rect.center() );
|
---|
993 |
|
---|
994 | if ( d_data->legendAttributes == 0 )
|
---|
995 | {
|
---|
996 | QBrush brush = d_data->brush;
|
---|
997 | if ( brush.style() == Qt::NoBrush )
|
---|
998 | {
|
---|
999 | if ( style() != QwtPlotCurve::NoCurve )
|
---|
1000 | brush = QBrush( pen().color() );
|
---|
1001 | else if ( d_data->symbol &&
|
---|
1002 | ( d_data->symbol->style() != QwtSymbol::NoSymbol ) )
|
---|
1003 | {
|
---|
1004 | brush = QBrush( d_data->symbol->pen().color() );
|
---|
1005 | }
|
---|
1006 | }
|
---|
1007 | if ( brush.style() != Qt::NoBrush )
|
---|
1008 | painter->fillRect( r, brush );
|
---|
1009 | }
|
---|
1010 | if ( d_data->legendAttributes & QwtPlotCurve::LegendShowBrush )
|
---|
1011 | {
|
---|
1012 | if ( d_data->brush.style() != Qt::NoBrush )
|
---|
1013 | painter->fillRect( r, d_data->brush );
|
---|
1014 | }
|
---|
1015 | if ( d_data->legendAttributes & QwtPlotCurve::LegendShowLine )
|
---|
1016 | {
|
---|
1017 | if ( pen() != Qt::NoPen )
|
---|
1018 | {
|
---|
1019 | painter->setPen( pen() );
|
---|
1020 | QwtPainter::drawLine( painter, rect.left(), rect.center().y(),
|
---|
1021 | rect.right() - 1.0, rect.center().y() );
|
---|
1022 | }
|
---|
1023 | }
|
---|
1024 | if ( d_data->legendAttributes & QwtPlotCurve::LegendShowSymbol )
|
---|
1025 | {
|
---|
1026 | if ( d_data->symbol &&
|
---|
1027 | ( d_data->symbol->style() != QwtSymbol::NoSymbol ) )
|
---|
1028 | {
|
---|
1029 | QSize symbolSize = d_data->symbol->boundingSize();
|
---|
1030 | symbolSize -= QSize( 2, 2 );
|
---|
1031 |
|
---|
1032 | // scale the symbol size down if it doesn't fit into rect.
|
---|
1033 |
|
---|
1034 | double xRatio = 1.0;
|
---|
1035 | if ( rect.width() < symbolSize.width() )
|
---|
1036 | xRatio = rect.width() / symbolSize.width();
|
---|
1037 | double yRatio = 1.0;
|
---|
1038 | if ( rect.height() < symbolSize.height() )
|
---|
1039 | yRatio = rect.height() / symbolSize.height();
|
---|
1040 |
|
---|
1041 | const double ratio = qMin( xRatio, yRatio );
|
---|
1042 |
|
---|
1043 | painter->save();
|
---|
1044 | painter->scale( ratio, ratio );
|
---|
1045 |
|
---|
1046 | d_data->symbol->drawSymbol( painter, rect.center() / ratio );
|
---|
1047 |
|
---|
1048 | painter->restore();
|
---|
1049 | }
|
---|
1050 | }
|
---|
1051 | }
|
---|
1052 |
|
---|
1053 | /*!
|
---|
1054 | Initialize data with an array of points (explicitly shared).
|
---|
1055 |
|
---|
1056 | \param samples Vector of points
|
---|
1057 | */
|
---|
1058 | void QwtPlotCurve::setSamples( const QVector<QPointF> &samples )
|
---|
1059 | {
|
---|
1060 | delete d_series;
|
---|
1061 | d_series = new QwtPointSeriesData( samples );
|
---|
1062 | itemChanged();
|
---|
1063 | }
|
---|
1064 |
|
---|
1065 | #ifndef QWT_NO_COMPAT
|
---|
1066 |
|
---|
1067 | /*!
|
---|
1068 | \brief Initialize the data by pointing to memory blocks which
|
---|
1069 | are not managed by QwtPlotCurve.
|
---|
1070 |
|
---|
1071 | setRawSamples is provided for efficiency.
|
---|
1072 | It is important to keep the pointers
|
---|
1073 | during the lifetime of the underlying QwtCPointerData class.
|
---|
1074 |
|
---|
1075 | \param xData pointer to x data
|
---|
1076 | \param yData pointer to y data
|
---|
1077 | \param size size of x and y
|
---|
1078 |
|
---|
1079 | \sa QwtCPointerData
|
---|
1080 | */
|
---|
1081 | void QwtPlotCurve::setRawSamples(
|
---|
1082 | const double *xData, const double *yData, int size )
|
---|
1083 | {
|
---|
1084 | delete d_series;
|
---|
1085 | d_series = new QwtCPointerData( xData, yData, size );
|
---|
1086 | itemChanged();
|
---|
1087 | }
|
---|
1088 |
|
---|
1089 | /*!
|
---|
1090 | Set data by copying x- and y-values from specified memory blocks.
|
---|
1091 | Contrary to setRawSamples(), this function makes a 'deep copy' of
|
---|
1092 | the data.
|
---|
1093 |
|
---|
1094 | \param xData pointer to x values
|
---|
1095 | \param yData pointer to y values
|
---|
1096 | \param size size of xData and yData
|
---|
1097 |
|
---|
1098 | \sa QwtPointArrayData
|
---|
1099 | */
|
---|
1100 | void QwtPlotCurve::setSamples(
|
---|
1101 | const double *xData, const double *yData, int size )
|
---|
1102 | {
|
---|
1103 | delete d_series;
|
---|
1104 | d_series = new QwtPointArrayData( xData, yData, size );
|
---|
1105 | itemChanged();
|
---|
1106 | }
|
---|
1107 |
|
---|
1108 | /*!
|
---|
1109 | \brief Initialize data with x- and y-arrays (explicitly shared)
|
---|
1110 |
|
---|
1111 | \param xData x data
|
---|
1112 | \param yData y data
|
---|
1113 |
|
---|
1114 | \sa QwtPointArrayData
|
---|
1115 | */
|
---|
1116 | void QwtPlotCurve::setSamples( const QVector<double> &xData,
|
---|
1117 | const QVector<double> &yData )
|
---|
1118 | {
|
---|
1119 | delete d_series;
|
---|
1120 | d_series = new QwtPointArrayData( xData, yData );
|
---|
1121 | itemChanged();
|
---|
1122 | }
|
---|
1123 | #endif // !QWT_NO_COMPAT
|
---|
1124 |
|
---|