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1 | 1 | #include "Visualization/VisualizationGraphRenderingDelegate.h" |
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2 | 2 | #include "Visualization/qcustomplot.h" |
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3 | 3 | |
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4 | 4 | namespace { |
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5 | 5 | |
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6 | 6 | const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz"); |
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7 | 7 | |
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8 | 8 | const auto TEXT_TRACER_FORMAT = QStringLiteral("key: %1\nvalue: %2"); |
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9 | 9 | |
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10 | 10 | /// Timeout after which a tracer is displayed |
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11 | 11 | const auto TRACER_TIMEOUT = 500; |
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12 | 12 | |
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13 | 13 | /// Formats a data value according to the axis on which it is present |
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14 | 14 | QString formatValue(double value, const QCPAxis &axis) |
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15 | 15 | { |
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16 | 16 | // If the axis is a time axis, formats the value as a date |
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17 | 17 | return qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker()) |
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18 | 18 | ? QCPAxisTickerDateTime::keyToDateTime(value).toString(DATETIME_FORMAT) |
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19 | 19 | : QString::number(value); |
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20 | 20 | } |
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21 | ||
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22 | void initPointTracerStyle(QCPItemTracer &tracer) noexcept | |
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23 | { | |
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24 | tracer.setInterpolating(false); | |
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25 | tracer.setStyle(QCPItemTracer::tsPlus); | |
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26 | tracer.setPen(QPen(Qt::black)); | |
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27 | tracer.setBrush(Qt::black); | |
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28 | tracer.setSize(10); | |
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29 | } | |
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30 | ||
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31 | void initTextTracerStyle(QCPItemText &tracer) noexcept | |
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32 | { | |
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33 | tracer.setPen(QPen{Qt::gray}); | |
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34 | tracer.setBrush(Qt::white); | |
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35 | tracer.setPadding(QMargins{6, 6, 6, 6}); | |
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36 | tracer.setPositionAlignment(Qt::AlignTop | Qt::AlignLeft); | |
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37 | tracer.setTextAlignment(Qt::AlignLeft); | |
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38 | } | |
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39 | ||
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21 | 40 | } // namespace |
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22 | 41 | |
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23 | 42 | struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate { |
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24 | 43 | explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot) |
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25 | 44 | : m_Plot{plot}, |
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26 | 45 | m_PointTracer{new QCPItemTracer{&plot}}, |
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27 | 46 | m_TextTracer{new QCPItemText{&plot}}, |
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28 | 47 | m_TracerTimer{} |
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29 | 48 | { |
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49 | initPointTracerStyle(*m_PointTracer); | |
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50 | initTextTracerStyle(*m_TextTracer); | |
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30 | 51 | |
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31 | 52 | m_TracerTimer.setInterval(TRACER_TIMEOUT); |
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32 | 53 | m_TracerTimer.setSingleShot(true); |
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33 | 54 | } |
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34 | 55 | |
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35 | 56 | QCustomPlot &m_Plot; |
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36 | 57 | QCPItemTracer *m_PointTracer; |
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37 | 58 | QCPItemText *m_TextTracer; |
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38 | 59 | QTimer m_TracerTimer; |
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39 | 60 | }; |
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40 | 61 | |
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41 | 62 | VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot) |
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42 | 63 | : impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)} |
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43 | 64 | { |
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44 | 65 | } |
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45 | 66 | |
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46 | 67 | void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept |
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47 | 68 | { |
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48 | 69 | // Cancels pending refresh |
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49 | 70 | impl->m_TracerTimer.disconnect(); |
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50 | 71 | |
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51 | 72 | auto showTracers = [ eventPos = event->pos(), this ]() |
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52 | 73 | { |
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53 | 74 | // Lambda function to display a tracer |
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54 | 75 | auto displayTracer = [this](auto &tracer) { |
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55 | 76 | // Tracer is set on top of the plot's main layer |
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56 | 77 | tracer.setLayer(impl->m_Plot.layer("main")); |
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57 | 78 | tracer.setVisible(true); |
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58 | 79 | impl->m_Plot.replot(); |
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59 | 80 | }; |
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60 | 81 | |
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61 | 82 | // Reinits tracers |
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62 | 83 | impl->m_PointTracer->setGraph(nullptr); |
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63 | 84 | impl->m_PointTracer->setVisible(false); |
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64 | 85 | impl->m_TextTracer->setVisible(false); |
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65 | 86 | impl->m_Plot.replot(); |
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66 | 87 | |
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67 | 88 | // Gets the graph under the mouse position |
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68 | 89 | if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) { |
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69 | 90 | auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x()); |
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70 | 91 | auto graphData = graph->data(); |
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71 | 92 | |
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72 | 93 | // Gets the closest data point to the mouse |
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73 | 94 | auto graphDataIt = graphData->findBegin(mouseKey); |
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74 | 95 | if (graphDataIt != graphData->constEnd()) { |
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75 | 96 | auto key = formatValue(graphDataIt->key, *graph->keyAxis()); |
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76 | 97 | auto value = formatValue(graphDataIt->value, *graph->valueAxis()); |
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77 | 98 | impl->m_TextTracer->setText(TEXT_TRACER_FORMAT.arg(key, value)); |
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78 | 99 | |
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79 | 100 | // Displays point tracer |
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80 | 101 | impl->m_PointTracer->setGraph(graph); |
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81 | 102 | impl->m_PointTracer->setGraphKey(mouseKey); |
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82 | 103 | displayTracer(*impl->m_PointTracer); |
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83 | 104 | |
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84 | 105 | // Displays text tracer |
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85 | 106 | auto tracerPosition = impl->m_TextTracer->position; |
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86 | 107 | tracerPosition->setAxes(graph->keyAxis(), graph->valueAxis()); |
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87 | 108 | tracerPosition->setCoords(impl->m_PointTracer->position->key(), |
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88 | 109 | impl->m_PointTracer->position->value()); |
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89 | 110 | displayTracer(*impl->m_TextTracer); |
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90 | 111 | } |
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91 | 112 | } |
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92 | 113 | }; |
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93 | 114 | |
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94 | 115 | // Starts the timer to display tracers at timeout |
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95 | 116 | QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTracers); |
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96 | 117 | impl->m_TracerTimer.start(); |
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97 | 118 | } |
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