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378
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1 module simple;
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2
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3 import std.math;
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4
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5 import qt.gui.QApplication;
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6 import qt.qwt.QwtPlot;
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7 import qt.qwt.QwtPlotMarker;
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8 import qt.qwt.QwtPlotCurve;
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9 import qt.qwt.QwtLegend;
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10 import qt.qwt.QwtData;
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11 import qt.qwt.QwtText;
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12
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13 //-----------------------------------------------------------------
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14 // simple.d
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15 //
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16 // A simple example which shows how to use QwtPlot and QwtData
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17 //-----------------------------------------------------------------
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18
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19 real mysin(real arg)
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20 {
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21 return sin(arg);
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22 }
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23
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24 real mycos(real arg)
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25 {
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26 return cos(arg);
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27 }
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28
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29 alias real function(real) double_func;
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30
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31 class SimpleData: QwtData
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32 {
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33 // The x values depend on its index and the y values
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34 // can be calculated from the corresponding x value.
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35 // So we don't need to store the values.
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36 // Such an implementation is slower because every point
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37 // has to be recalculated for every replot, but it demonstrates how
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38 // QwtData can be used.
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39
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40 public:
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41 this(const double_func y, size_t size)
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42 {
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43 d_size = size;
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44 d_y = y;
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45 }
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46
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47 QwtData copy() const
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48 {
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49 return new SimpleData(d_y, d_size);
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50 }
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51
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52 size_t size() const
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53 {
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54 return d_size;
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55 }
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56
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57 double x(size_t i) const
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58 {
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59 return 0.1 * i;
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60 }
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61
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62 double y(size_t i) const
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63 {
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64 return d_y(x(i));
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65 }
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66 private:
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67 size_t d_size;
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68 const double_func d_y;
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69 };
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70
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71 class Plot : QwtPlot
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72 {
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73 public:
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74 this()
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75 {
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76 super(cast(QWidget)null);
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77 setTitle("A Simple QwtPlot Demonstration");
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78 insertLegend(new QwtLegend(cast(QWidget)null), QwtPlot.RightLegend);
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79
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80 // Set axis titles
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81 setAxisTitle(xBottom, "x -.");
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82 setAxisTitle(yLeft, "y -.");
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83
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84 // Insert new curves
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85 auto cSin = new QwtPlotCurve("y = sin(x)");
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86 cSin.setRenderHint(QwtPlotItem.RenderAntialiased);
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87 cSin.setPen(new QPen(new QColor(Qt.red)));
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88 cSin.attach(this);
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89
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90 auto cCos = new QwtPlotCurve("y = cos(x)");
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91 cCos.setRenderHint(QwtPlotItem.RenderAntialiased);
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92 cCos.setPen(new QPen(new QColor(Qt.blue)));
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93 cCos.attach(this);
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94
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95 // Create sin and cos data
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96 const int nPoints = 100;
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97 cSin.setData(new SimpleData(&mysin, nPoints));
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98 cCos.setData(new SimpleData(&mycos, nPoints));
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99
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100 // Insert markers
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101
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102 // ...a horizontal line at y = 0...
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103 auto mY = new QwtPlotMarker();
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104 mY.setLabel(new QwtText("y = 0"));
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105 mY.setLabelAlignment(Qt.AlignRight | Qt.AlignTop);
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106 mY.setLineStyle(QwtPlotMarker.HLine);
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107 mY.setYValue(0.0);
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108 mY.attach(this);
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109
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110 // ...a vertical line at x = 2 * pi
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111 auto mX = new QwtPlotMarker();
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112 mX.setLabel(new QwtText("x = 2 pi"));
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113 mX.setLabelAlignment(Qt.AlignLeft | Qt.AlignBottom);
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114 mX.setLabelOrientation(Qt.Vertical);
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115 mX.setLineStyle(QwtPlotMarker.VLine);
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116 mX.setLinePen(new QPen(new QBrush(Qt.black), 0, Qt.DashDotLine));
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117 mX.setXValue(2.0 * PI);
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118 mX.attach(this);
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119 }
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120
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121 };
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122
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123 int main(string[] args)
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124 {
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125 auto a = new QApplication(args);
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126
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127 scope plot = new Plot;
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128 plot.resize(600,400);
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129 plot.show();
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130 return a.exec();
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131 }
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