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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 | const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz"); | |
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7 | ||
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8 | const auto TEXT_TRACER_FORMAT = QStringLiteral("key: %1\nvalue: %2"); | |
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9 | ||
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6 | 10 | /// Timeout after which a tracer is displayed |
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7 | 11 | const auto TRACER_TIMEOUT = 500; |
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8 | 12 | |
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13 | /// Formats a data value according to the axis on which it is present | |
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14 | QString formatValue(double value, const QCPAxis &axis) | |
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15 | { | |
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16 | // If the axis is a time axis, formats the value as a date | |
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17 | return qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker()) | |
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18 | ? QCPAxisTickerDateTime::keyToDateTime(value).toString(DATETIME_FORMAT) | |
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19 | : QString::number(value); | |
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20 | } | |
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9 | 21 | } // namespace |
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10 | 22 | |
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11 | 23 | struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate { |
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12 | 24 | explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot) |
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13 | 25 | : m_Plot{plot}, |
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14 | 26 | m_PointTracer{new QCPItemTracer{&plot}}, |
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15 | 27 | m_TextTracer{new QCPItemText{&plot}}, |
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16 | 28 | m_TracerTimer{} |
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17 | 29 | { |
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18 | 30 | |
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19 | 31 | m_TracerTimer.setInterval(TRACER_TIMEOUT); |
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20 | 32 | m_TracerTimer.setSingleShot(true); |
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21 | 33 | } |
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22 | 34 | |
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23 | 35 | QCustomPlot &m_Plot; |
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24 | 36 | QCPItemTracer *m_PointTracer; |
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25 | 37 | QCPItemText *m_TextTracer; |
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26 | 38 | QTimer m_TracerTimer; |
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27 | 39 | }; |
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28 | 40 | |
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29 | 41 | VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot) |
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30 | 42 | : impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)} |
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31 | 43 | { |
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32 | 44 | } |
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33 | 45 | |
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34 | 46 | void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept |
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35 | 47 | { |
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36 | 48 | // Cancels pending refresh |
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37 | 49 | impl->m_TracerTimer.disconnect(); |
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38 | 50 | |
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39 | 51 | auto showTracers = [ eventPos = event->pos(), this ]() |
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40 | 52 | { |
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53 | // Reinits tracers | |
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54 | impl->m_PointTracer->setGraph(nullptr); | |
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55 | impl->m_PointTracer->setVisible(false); | |
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56 | impl->m_TextTracer->setVisible(false); | |
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57 | impl->m_Plot.replot(); | |
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58 | ||
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59 | // Gets the graph under the mouse position | |
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60 | if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) { | |
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61 | auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x()); | |
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62 | auto graphData = graph->data(); | |
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63 | ||
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64 | // Gets the closest data point to the mouse | |
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65 | auto graphDataIt = graphData->findBegin(mouseKey); | |
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66 | if (graphDataIt != graphData->constEnd()) { | |
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67 | auto key = formatValue(graphDataIt->key, *graph->keyAxis()); | |
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68 | auto value = formatValue(graphDataIt->value, *graph->valueAxis()); | |
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69 | impl->m_TextTracer->setText(TEXT_TRACER_FORMAT.arg(key, value)); | |
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70 | } | |
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41 | 71 | }; |
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42 | 72 | |
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43 | 73 | // Starts the timer to display tracers at timeout |
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44 | 74 | QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTracers); |
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45 | 75 | impl->m_TracerTimer.start(); |
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46 | 76 | } |
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