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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 | #include <Common/DateUtils.h> |
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5 | 5 | |
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6 | 6 | namespace { |
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7 | 7 | |
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8 | 8 | const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz"); |
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9 | 9 | |
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10 | 10 | const auto TOOLTIP_FORMAT = QStringLiteral("key: %1\nvalue: %2"); |
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11 | 11 | |
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12 | /// Offset used to shift the tooltip of the mouse | |
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13 | const auto TOOLTIP_OFFSET = QPoint{20, 20}; | |
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14 | ||
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12 | 15 | /// Tooltip display rectangle (the tooltip is hidden when the mouse leaves this rectangle) |
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13 | 16 | const auto TOOLTIP_RECT = QRect{10, 10, 10, 10}; |
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14 | 17 | |
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15 | 18 | /// Timeout after which the tooltip is displayed |
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16 | 19 | const auto TOOLTIP_TIMEOUT = 500; |
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17 | 20 | |
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18 | 21 | /// Formats a data value according to the axis on which it is present |
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19 | 22 | QString formatValue(double value, const QCPAxis &axis) |
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20 | 23 | { |
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21 | 24 | // If the axis is a time axis, formats the value as a date |
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22 | 25 | if (auto axisTicker = qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())) { |
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23 | 26 | return DateUtils::dateTime(value, axisTicker->dateTimeSpec()).toString(DATETIME_FORMAT); |
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24 | 27 | } |
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25 | 28 | else { |
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26 | 29 | return QString::number(value); |
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27 | 30 | } |
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28 | 31 | } |
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29 | 32 | |
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30 | 33 | void initPointTracerStyle(QCPItemTracer &tracer) noexcept |
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31 | 34 | { |
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32 | 35 | tracer.setInterpolating(false); |
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33 | 36 | tracer.setStyle(QCPItemTracer::tsCircle); |
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34 | 37 | tracer.setSize(3); |
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35 | 38 | tracer.setPen(QPen(Qt::black)); |
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36 | 39 | tracer.setBrush(Qt::black); |
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37 | 40 | } |
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38 | 41 | |
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39 | 42 | } // namespace |
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40 | 43 | |
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41 | 44 | struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate { |
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42 | 45 | explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot) |
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43 | 46 | : m_Plot{plot}, m_PointTracer{new QCPItemTracer{&plot}}, m_TracerTimer{} |
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44 | 47 | { |
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45 | 48 | initPointTracerStyle(*m_PointTracer); |
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46 | 49 | |
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47 | 50 | m_TracerTimer.setInterval(TOOLTIP_TIMEOUT); |
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48 | 51 | m_TracerTimer.setSingleShot(true); |
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49 | 52 | } |
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50 | 53 | |
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51 | 54 | QCustomPlot &m_Plot; |
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52 | 55 | QCPItemTracer *m_PointTracer; |
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53 | 56 | QTimer m_TracerTimer; |
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54 | 57 | }; |
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55 | 58 | |
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56 | 59 | VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot) |
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57 | 60 | : impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)} |
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58 | 61 | { |
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59 | 62 | } |
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60 | 63 | |
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61 | 64 | void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept |
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62 | 65 | { |
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63 | 66 | // Cancels pending refresh |
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64 | 67 | impl->m_TracerTimer.disconnect(); |
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65 | 68 | |
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66 | 69 | // Reinits tracers |
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67 | 70 | impl->m_PointTracer->setGraph(nullptr); |
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68 | 71 | impl->m_PointTracer->setVisible(false); |
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69 | 72 | impl->m_Plot.replot(); |
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70 | 73 | |
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71 | 74 | // Gets the graph under the mouse position |
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72 | 75 | auto eventPos = event->pos(); |
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73 | 76 | if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) { |
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74 | 77 | auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x()); |
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75 | 78 | auto graphData = graph->data(); |
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76 | 79 | |
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77 | 80 | // Gets the closest data point to the mouse |
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78 | 81 | auto graphDataIt = graphData->findBegin(mouseKey); |
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79 | 82 | if (graphDataIt != graphData->constEnd()) { |
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80 | 83 | auto key = formatValue(graphDataIt->key, *graph->keyAxis()); |
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81 | 84 | auto value = formatValue(graphDataIt->value, *graph->valueAxis()); |
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82 | 85 | |
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83 | 86 | // Displays point tracer |
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84 | 87 | impl->m_PointTracer->setGraph(graph); |
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85 | 88 | impl->m_PointTracer->setGraphKey(graphDataIt->key); |
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86 | 89 | impl->m_PointTracer->setLayer( |
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87 | 90 | impl->m_Plot.layer("main")); // Tracer is set on top of the plot's main layer |
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88 | 91 | impl->m_PointTracer->setVisible(true); |
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89 | 92 | impl->m_Plot.replot(); |
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90 | 93 | |
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91 | 94 | // Starts timer to show tooltip after timeout |
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92 | 95 | auto showTooltip = [ tooltip = TOOLTIP_FORMAT.arg(key, value), eventPos, this ]() |
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93 | 96 | { |
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94 |
QToolTip::showText(impl->m_Plot.mapToGlobal(eventPos), tooltip, |
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95 | TOOLTIP_RECT); | |
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97 | QToolTip::showText(impl->m_Plot.mapToGlobal(eventPos) + TOOLTIP_OFFSET, tooltip, | |
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98 | &impl->m_Plot, TOOLTIP_RECT); | |
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96 | 99 | }; |
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97 | 100 | |
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98 | 101 | QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTooltip); |
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99 | 102 | impl->m_TracerTimer.start(); |
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100 | 103 | } |
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101 | 104 | } |
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102 | 105 | } |
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