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#include "Visualization/VisualizationGraphRenderingDelegate.h"
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#include "Visualization/qcustomplot.h"
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namespace {
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const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");
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const auto TEXT_TRACER_FORMAT = QStringLiteral("key: %1\nvalue: %2");
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/// Timeout after which a tracer is displayed
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const auto TRACER_TIMEOUT = 500;
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/// Formats a data value according to the axis on which it is present
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QString formatValue(double value, const QCPAxis &axis)
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{
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// If the axis is a time axis, formats the value as a date
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return qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())
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? QCPAxisTickerDateTime::keyToDateTime(value).toString(DATETIME_FORMAT)
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: QString::number(value);
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}
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void initPointTracerStyle(QCPItemTracer &tracer) noexcept
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{
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tracer.setInterpolating(false);
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tracer.setStyle(QCPItemTracer::tsPlus);
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tracer.setPen(QPen(Qt::black));
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tracer.setBrush(Qt::black);
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tracer.setSize(10);
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}
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void initTextTracerStyle(QCPItemText &tracer) noexcept
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{
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tracer.setPen(QPen{Qt::gray});
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tracer.setBrush(Qt::white);
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tracer.setPadding(QMargins{6, 6, 6, 6});
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tracer.setPositionAlignment(Qt::AlignTop | Qt::AlignLeft);
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tracer.setTextAlignment(Qt::AlignLeft);
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}
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} // namespace
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struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate {
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explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot)
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: m_Plot{plot},
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m_PointTracer{new QCPItemTracer{&plot}},
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m_TextTracer{new QCPItemText{&plot}},
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m_TracerTimer{}
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{
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initPointTracerStyle(*m_PointTracer);
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initTextTracerStyle(*m_TextTracer);
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m_TracerTimer.setInterval(TRACER_TIMEOUT);
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m_TracerTimer.setSingleShot(true);
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}
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QCustomPlot &m_Plot;
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QCPItemTracer *m_PointTracer;
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QCPItemText *m_TextTracer;
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QTimer m_TracerTimer;
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};
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VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot)
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: impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)}
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{
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}
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void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept
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{
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// Cancels pending refresh
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impl->m_TracerTimer.disconnect();
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auto showTracers = [ eventPos = event->pos(), this ]()
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{
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// Lambda function to display a tracer
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auto displayTracer = [this](auto &tracer) {
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// Tracer is set on top of the plot's main layer
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tracer.setLayer(impl->m_Plot.layer("main"));
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tracer.setVisible(true);
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impl->m_Plot.replot();
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};
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// Reinits tracers
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impl->m_PointTracer->setGraph(nullptr);
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impl->m_PointTracer->setVisible(false);
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impl->m_TextTracer->setVisible(false);
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impl->m_Plot.replot();
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// Gets the graph under the mouse position
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if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) {
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auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x());
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auto graphData = graph->data();
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// Gets the closest data point to the mouse
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auto graphDataIt = graphData->findBegin(mouseKey);
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if (graphDataIt != graphData->constEnd()) {
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auto key = formatValue(graphDataIt->key, *graph->keyAxis());
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auto value = formatValue(graphDataIt->value, *graph->valueAxis());
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impl->m_TextTracer->setText(TEXT_TRACER_FORMAT.arg(key, value));
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// Displays point tracer
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impl->m_PointTracer->setGraph(graph);
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impl->m_PointTracer->setGraphKey(mouseKey);
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displayTracer(*impl->m_PointTracer);
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// Displays text tracer
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auto tracerPosition = impl->m_TextTracer->position;
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tracerPosition->setAxes(graph->keyAxis(), graph->valueAxis());
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tracerPosition->setCoords(impl->m_PointTracer->position->key(),
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impl->m_PointTracer->position->value());
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displayTracer(*impl->m_TextTracer);
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}
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}
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};
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// Starts the timer to display tracers at timeout
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QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTracers);
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impl->m_TracerTimer.start();
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}
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