##// END OF EJS Templates
Show tracers method (2)...
Alexandre Leroux -
r484:a4b9eba8c160
parent child
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@@ -1,76 +1,97
1 1 #include "Visualization/VisualizationGraphRenderingDelegate.h"
2 2 #include "Visualization/qcustomplot.h"
3 3
4 4 namespace {
5 5
6 6 const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");
7 7
8 8 const auto TEXT_TRACER_FORMAT = QStringLiteral("key: %1\nvalue: %2");
9 9
10 10 /// Timeout after which a tracer is displayed
11 11 const auto TRACER_TIMEOUT = 500;
12 12
13 13 /// Formats a data value according to the axis on which it is present
14 14 QString formatValue(double value, const QCPAxis &axis)
15 15 {
16 16 // If the axis is a time axis, formats the value as a date
17 17 return qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())
18 18 ? QCPAxisTickerDateTime::keyToDateTime(value).toString(DATETIME_FORMAT)
19 19 : QString::number(value);
20 20 }
21 21 } // namespace
22 22
23 23 struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate {
24 24 explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot)
25 25 : m_Plot{plot},
26 26 m_PointTracer{new QCPItemTracer{&plot}},
27 27 m_TextTracer{new QCPItemText{&plot}},
28 28 m_TracerTimer{}
29 29 {
30 30
31 31 m_TracerTimer.setInterval(TRACER_TIMEOUT);
32 32 m_TracerTimer.setSingleShot(true);
33 33 }
34 34
35 35 QCustomPlot &m_Plot;
36 36 QCPItemTracer *m_PointTracer;
37 37 QCPItemText *m_TextTracer;
38 38 QTimer m_TracerTimer;
39 39 };
40 40
41 41 VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot)
42 42 : impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)}
43 43 {
44 44 }
45 45
46 46 void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept
47 47 {
48 48 // Cancels pending refresh
49 49 impl->m_TracerTimer.disconnect();
50 50
51 51 auto showTracers = [ eventPos = event->pos(), this ]()
52 52 {
53 // Lambda function to display a tracer
54 auto displayTracer = [this](auto &tracer) {
55 // Tracer is set on top of the plot's main layer
56 tracer.setLayer(impl->m_Plot.layer("main"));
57 tracer.setVisible(true);
58 impl->m_Plot.replot();
59 };
60
53 61 // Reinits tracers
54 62 impl->m_PointTracer->setGraph(nullptr);
55 63 impl->m_PointTracer->setVisible(false);
56 64 impl->m_TextTracer->setVisible(false);
57 65 impl->m_Plot.replot();
58 66
59 67 // Gets the graph under the mouse position
60 68 if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) {
61 69 auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x());
62 70 auto graphData = graph->data();
63 71
64 72 // Gets the closest data point to the mouse
65 73 auto graphDataIt = graphData->findBegin(mouseKey);
66 74 if (graphDataIt != graphData->constEnd()) {
67 75 auto key = formatValue(graphDataIt->key, *graph->keyAxis());
68 76 auto value = formatValue(graphDataIt->value, *graph->valueAxis());
69 77 impl->m_TextTracer->setText(TEXT_TRACER_FORMAT.arg(key, value));
78
79 // Displays point tracer
80 impl->m_PointTracer->setGraph(graph);
81 impl->m_PointTracer->setGraphKey(mouseKey);
82 displayTracer(*impl->m_PointTracer);
83
84 // Displays text tracer
85 auto tracerPosition = impl->m_TextTracer->position;
86 tracerPosition->setAxes(graph->keyAxis(), graph->valueAxis());
87 tracerPosition->setCoords(impl->m_PointTracer->position->key(),
88 impl->m_PointTracer->position->value());
89 displayTracer(*impl->m_TextTracer);
90 }
70 91 }
71 92 };
72 93
73 94 // Starts the timer to display tracers at timeout
74 95 QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTracers);
75 96 impl->m_TracerTimer.start();
76 97 }
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