VisualizationGraphRenderingDelegate.cpp
76 lines
| 2.7 KiB
| text/x-c
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CppLexer
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r480 | #include "Visualization/VisualizationGraphRenderingDelegate.h" | ||
#include "Visualization/qcustomplot.h" | ||||
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r482 | namespace { | ||
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r483 | const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz"); | ||
const auto TEXT_TRACER_FORMAT = QStringLiteral("key: %1\nvalue: %2"); | ||||
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r482 | /// Timeout after which a tracer is displayed | ||
const auto TRACER_TIMEOUT = 500; | ||||
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r483 | /// Formats a data value according to the axis on which it is present | ||
QString formatValue(double value, const QCPAxis &axis) | ||||
{ | ||||
// If the axis is a time axis, formats the value as a date | ||||
return qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker()) | ||||
? QCPAxisTickerDateTime::keyToDateTime(value).toString(DATETIME_FORMAT) | ||||
: QString::number(value); | ||||
} | ||||
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r482 | } // namespace | ||
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r480 | struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate { | ||
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r482 | explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot) | ||
: m_Plot{plot}, | ||||
m_PointTracer{new QCPItemTracer{&plot}}, | ||||
m_TextTracer{new QCPItemText{&plot}}, | ||||
m_TracerTimer{} | ||||
{ | ||||
m_TracerTimer.setInterval(TRACER_TIMEOUT); | ||||
m_TracerTimer.setSingleShot(true); | ||||
} | ||||
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r480 | |||
QCustomPlot &m_Plot; | ||||
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r482 | QCPItemTracer *m_PointTracer; | ||
QCPItemText *m_TextTracer; | ||||
QTimer m_TracerTimer; | ||||
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r480 | }; | ||
VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot) | ||||
: impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)} | ||||
{ | ||||
} | ||||
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r481 | |||
void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept | ||||
{ | ||||
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r482 | // Cancels pending refresh | ||
impl->m_TracerTimer.disconnect(); | ||||
auto showTracers = [ eventPos = event->pos(), this ]() | ||||
{ | ||||
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r483 | // Reinits tracers | ||
impl->m_PointTracer->setGraph(nullptr); | ||||
impl->m_PointTracer->setVisible(false); | ||||
impl->m_TextTracer->setVisible(false); | ||||
impl->m_Plot.replot(); | ||||
// Gets the graph under the mouse position | ||||
if (auto graph = qobject_cast<QCPGraph *>(impl->m_Plot.plottableAt(eventPos))) { | ||||
auto mouseKey = graph->keyAxis()->pixelToCoord(eventPos.x()); | ||||
auto graphData = graph->data(); | ||||
// Gets the closest data point to the mouse | ||||
auto graphDataIt = graphData->findBegin(mouseKey); | ||||
if (graphDataIt != graphData->constEnd()) { | ||||
auto key = formatValue(graphDataIt->key, *graph->keyAxis()); | ||||
auto value = formatValue(graphDataIt->value, *graph->valueAxis()); | ||||
impl->m_TextTracer->setText(TEXT_TRACER_FORMAT.arg(key, value)); | ||||
} | ||||
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r482 | }; | ||
// Starts the timer to display tracers at timeout | ||||
QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTracers); | ||||
impl->m_TracerTimer.start(); | ||||
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r481 | } | ||