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comparison examples/qwt/simpleplot/simple.d @ 378:7341c47790d4

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binding of qwt
author Eldar Insafutdinov
date Sat, 10 Jul 2010 21:54:44 +0100
parents
children a795eeb3b21f
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equal deleted inserted replaced
375:c429854a40c0 378:7341c47790d4
1 module simple;
2
3 import std.math;
4
5 import qt.gui.QApplication;
6 import qt.qwt.QwtPlot;
7 import qt.qwt.QwtPlotMarker;
8 import qt.qwt.QwtPlotCurve;
9 import qt.qwt.QwtLegend;
10 import qt.qwt.QwtData;
11 import qt.qwt.QwtText;
12
13 //-----------------------------------------------------------------
14 // simple.d
15 //
16 // A simple example which shows how to use QwtPlot and QwtData
17 //-----------------------------------------------------------------
18
19 real mysin(real arg)
20 {
21 return sin(arg);
22 }
23
24 real mycos(real arg)
25 {
26 return cos(arg);
27 }
28
29 alias real function(real) double_func;
30
31 class SimpleData: QwtData
32 {
33 // The x values depend on its index and the y values
34 // can be calculated from the corresponding x value.
35 // So we don't need to store the values.
36 // Such an implementation is slower because every point
37 // has to be recalculated for every replot, but it demonstrates how
38 // QwtData can be used.
39
40 public:
41 this(const double_func y, size_t size)
42 {
43 d_size = size;
44 d_y = y;
45 }
46
47 QwtData copy() const
48 {
49 return new SimpleData(d_y, d_size);
50 }
51
52 size_t size() const
53 {
54 return d_size;
55 }
56
57 double x(size_t i) const
58 {
59 return 0.1 * i;
60 }
61
62 double y(size_t i) const
63 {
64 return d_y(x(i));
65 }
66 private:
67 size_t d_size;
68 const double_func d_y;
69 };
70
71 class Plot : QwtPlot
72 {
73 public:
74 this()
75 {
76 super(cast(QWidget)null);
77 setTitle("A Simple QwtPlot Demonstration");
78 insertLegend(new QwtLegend(cast(QWidget)null), QwtPlot.RightLegend);
79
80 // Set axis titles
81 setAxisTitle(xBottom, "x -.");
82 setAxisTitle(yLeft, "y -.");
83
84 // Insert new curves
85 auto cSin = new QwtPlotCurve("y = sin(x)");
86 cSin.setRenderHint(QwtPlotItem.RenderAntialiased);
87 cSin.setPen(new QPen(new QColor(Qt.red)));
88 cSin.attach(this);
89
90 auto cCos = new QwtPlotCurve("y = cos(x)");
91 cCos.setRenderHint(QwtPlotItem.RenderAntialiased);
92 cCos.setPen(new QPen(new QColor(Qt.blue)));
93 cCos.attach(this);
94
95 // Create sin and cos data
96 const int nPoints = 100;
97 cSin.setData(new SimpleData(&mysin, nPoints));
98 cCos.setData(new SimpleData(&mycos, nPoints));
99
100 // Insert markers
101
102 // ...a horizontal line at y = 0...
103 auto mY = new QwtPlotMarker();
104 mY.setLabel(new QwtText("y = 0"));
105 mY.setLabelAlignment(Qt.AlignRight | Qt.AlignTop);
106 mY.setLineStyle(QwtPlotMarker.HLine);
107 mY.setYValue(0.0);
108 mY.attach(this);
109
110 // ...a vertical line at x = 2 * pi
111 auto mX = new QwtPlotMarker();
112 mX.setLabel(new QwtText("x = 2 pi"));
113 mX.setLabelAlignment(Qt.AlignLeft | Qt.AlignBottom);
114 mX.setLabelOrientation(Qt.Vertical);
115 mX.setLineStyle(QwtPlotMarker.VLine);
116 mX.setLinePen(new QPen(new QBrush(Qt.black), 0, Qt.DashDotLine));
117 mX.setXValue(2.0 * PI);
118 mX.attach(this);
119 }
120
121 };
122
123 int main(string[] args)
124 {
125 auto a = new QApplication(args);
126
127 scope plot = new Plot;
128 plot.resize(600,400);
129 plot.show();
130 return a.exec();
131 }