HG_REPOSITORIES/LPP/SciQLOP_Repos/SciQLop Files · gui/src/Visualization/VisualizationGraphRenderingDelegate.cpp

Implements method to get min/max values of a dataseries giving a range (1)

Alexandre Leroux - - Load All Authors

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             VisualizationGraphRenderingDelegate.cpp
        
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             / gui / src / Visualization / VisualizationGraphRenderingDelegate.cpp
          
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        Alexandre Leroux
    
Creates a delegate offering methods for rendering a graph

              r480
            
      #include "Visualization/VisualizationGraphRenderingDelegate.h"

      #include "Visualization/qcustomplot.h"

        Alexandre Leroux
    
Uses the same time spec (UTC) as axis for tooltips on graph

              r490
            
      #include <Common/DateUtils.h>

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
      namespace {

        Alexandre Leroux
    
Show tracers method (1)...

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      const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");

        Alexandre Leroux
    
Uses Qt tooltips instead of QCPTextItem...

              r576
            
      const auto TOOLTIP_FORMAT = QStringLiteral("key: %1\nvalue: %2");

        Alexandre Leroux
    
Show tracers method (1)...

              r483
            
        Alexandre Leroux
    
Shifts tooltip to mouse

              r578
            
      /// Offset used to shift the tooltip of the mouse

      const auto TOOLTIP_OFFSET = QPoint{20, 20};

        Alexandre Leroux
    
Uses Qt tooltips instead of QCPTextItem...

              r576
            
      /// Tooltip display rectangle (the tooltip is hidden when the mouse leaves this rectangle)

      const auto TOOLTIP_RECT = QRect{10, 10, 10, 10};

      /// Timeout after which the tooltip is displayed

      const auto TOOLTIP_TIMEOUT = 500;

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
        Alexandre Leroux
    
Show tracers method (1)...

              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

        Alexandre Leroux
    
Uses the same time spec (UTC) as axis for tooltips on graph

              r490
            
          if (auto axisTicker = qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())) {

              return DateUtils::dateTime(value, axisTicker->dateTimeSpec()).toString(DATETIME_FORMAT);

          }

          else {

              return QString::number(value);

          }

        Alexandre Leroux
    
Show tracers method (1)...

              r483
            
      }

        Alexandre Leroux
    
Sets tracers' styles

              r485
            
      void initPointTracerStyle(QCPItemTracer &tracer) noexcept

      {

          tracer.setInterpolating(false);

        Alexandre Leroux
    
Replaces "Plus" cursor by "Circle" cursor

              r577
            
          tracer.setStyle(QCPItemTracer::tsCircle);

          tracer.setSize(3);

        Alexandre Leroux
    
Sets tracers' styles

              r485
            
          tracer.setPen(QPen(Qt::black));

          tracer.setBrush(Qt::black);

      }

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
      } // namespace

        Alexandre Leroux
    
Creates a delegate offering methods for rendering a graph

              r480
            
      struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate {

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
          explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot)

        Alexandre Leroux
    
Uses Qt tooltips instead of QCPTextItem...

              r576
            
                  : m_Plot{plot}, m_PointTracer{new QCPItemTracer{&plot}}, m_TracerTimer{}

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
          {

        Alexandre Leroux
    
Sets tracers' styles

              r485
            
              initPointTracerStyle(*m_PointTracer);

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
        Alexandre Leroux
    
Uses Qt tooltips instead of QCPTextItem...

              r576
            
              m_TracerTimer.setInterval(TOOLTIP_TIMEOUT);

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
              m_TracerTimer.setSingleShot(true);

          }

        Alexandre Leroux
    
Creates a delegate offering methods for rendering a graph

              r480
            
          QCustomPlot &m_Plot;

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
          QCPItemTracer *m_PointTracer;

          QTimer m_TracerTimer;

        Alexandre Leroux
    
Creates a delegate offering methods for rendering a graph

              r480
            
      };

      VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot)

              : impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)}

      {

      }

        Alexandre Leroux
    
Creates method that will display a tooltip and a tracer with data point information after a while

              r481
            
      void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept

      {

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
          // Cancels pending refresh

          impl->m_TracerTimer.disconnect();

        Alexandre Leroux
    
Uses Qt tooltips instead of QCPTextItem...

              r576
            
          // Reinits tracers

          impl->m_PointTracer->setGraph(nullptr);

          impl->m_PointTracer->setVisible(false);

          impl->m_Plot.replot();

          // Gets the graph under the mouse position

          auto eventPos = event->pos();

          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());

                  // Displays point tracer

                  impl->m_PointTracer->setGraph(graph);

                  impl->m_PointTracer->setGraphKey(graphDataIt->key);

                  impl->m_PointTracer->setLayer(

                      impl->m_Plot.layer("main")); // Tracer is set on top of the plot's main layer

                  impl->m_PointTracer->setVisible(true);

        Alexandre Leroux
    
Show tracers method (2)...

              r484
            
                  impl->m_Plot.replot();

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
        Alexandre Leroux
    
Uses Qt tooltips instead of QCPTextItem...

              r576
            
                  // Starts timer to show tooltip after timeout

                  auto showTooltip = [ tooltip = TOOLTIP_FORMAT.arg(key, value), eventPos, this ]()

                  {

        Alexandre Leroux
    
Shifts tooltip to mouse

              r578
            
                      QToolTip::showText(impl->m_Plot.mapToGlobal(eventPos) + TOOLTIP_OFFSET, tooltip,

                                         &impl->m_Plot, TOOLTIP_RECT);

        Alexandre Leroux
    
Uses Qt tooltips instead of QCPTextItem...

              r576
            
                  };

                  QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTooltip);

                  impl->m_TracerTimer.start();

              }

          }

        Alexandre Leroux
    
Creates method that will display a tooltip and a tracer with data point information after a while

              r481
            
      }

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Alexandre Leroux Creates a delegate offering methods for rendering a graph	r480	#include "Visualization/VisualizationGraphRenderingDelegate.h"
		#include "Visualization/qcustomplot.h"

Alexandre Leroux Uses the same time spec (UTC) as axis for tooltips on graph	r490	#include <Common/DateUtils.h>

Alexandre Leroux Inits tracers and timer...	r482	namespace {

Alexandre Leroux Show tracers method (1)...	r483	const auto DATETIME_FORMAT = QStringLiteral("yyyy/MM/dd hh:mm:ss:zzz");

Alexandre Leroux Uses Qt tooltips instead of QCPTextItem...	r576	const auto TOOLTIP_FORMAT = QStringLiteral("key: %1\nvalue: %2");
Alexandre Leroux Show tracers method (1)...	r483
Alexandre Leroux Shifts tooltip to mouse	r578	/// Offset used to shift the tooltip of the mouse
		const auto TOOLTIP_OFFSET = QPoint{20, 20};

Alexandre Leroux Uses Qt tooltips instead of QCPTextItem...	r576	/// Tooltip display rectangle (the tooltip is hidden when the mouse leaves this rectangle)
		const auto TOOLTIP_RECT = QRect{10, 10, 10, 10};

		/// Timeout after which the tooltip is displayed
		const auto TOOLTIP_TIMEOUT = 500;
Alexandre Leroux Inits tracers and timer...	r482
Alexandre Leroux Show tracers method (1)...	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
Alexandre Leroux Uses the same time spec (UTC) as axis for tooltips on graph	r490	if (auto axisTicker = qSharedPointerDynamicCast<QCPAxisTickerDateTime>(axis.ticker())) {
		return DateUtils::dateTime(value, axisTicker->dateTimeSpec()).toString(DATETIME_FORMAT);
		}
		else {
		return QString::number(value);
		}
Alexandre Leroux Show tracers method (1)...	r483	}
Alexandre Leroux Sets tracers' styles	r485
		void initPointTracerStyle(QCPItemTracer &tracer) noexcept
		{
		tracer.setInterpolating(false);
Alexandre Leroux Replaces "Plus" cursor by "Circle" cursor	r577	tracer.setStyle(QCPItemTracer::tsCircle);
		tracer.setSize(3);
Alexandre Leroux Sets tracers' styles	r485	tracer.setPen(QPen(Qt::black));
		tracer.setBrush(Qt::black);
		}

Alexandre Leroux Inits tracers and timer...	r482	} // namespace

Alexandre Leroux Creates a delegate offering methods for rendering a graph	r480	struct VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegatePrivate {
Alexandre Leroux Inits tracers and timer...	r482	explicit VisualizationGraphRenderingDelegatePrivate(QCustomPlot &plot)
Alexandre Leroux Uses Qt tooltips instead of QCPTextItem...	r576	: m_Plot{plot}, m_PointTracer{new QCPItemTracer{&plot}}, m_TracerTimer{}
Alexandre Leroux Inits tracers and timer...	r482	{
Alexandre Leroux Sets tracers' styles	r485	initPointTracerStyle(*m_PointTracer);
Alexandre Leroux Inits tracers and timer...	r482
Alexandre Leroux Uses Qt tooltips instead of QCPTextItem...	r576	m_TracerTimer.setInterval(TOOLTIP_TIMEOUT);
Alexandre Leroux Inits tracers and timer...	r482	m_TracerTimer.setSingleShot(true);
		}
Alexandre Leroux Creates a delegate offering methods for rendering a graph	r480
		QCustomPlot &m_Plot;
Alexandre Leroux Inits tracers and timer...	r482	QCPItemTracer *m_PointTracer;
		QTimer m_TracerTimer;
Alexandre Leroux Creates a delegate offering methods for rendering a graph	r480	};

		VisualizationGraphRenderingDelegate::VisualizationGraphRenderingDelegate(QCustomPlot &plot)
		: impl{spimpl::make_unique_impl<VisualizationGraphRenderingDelegatePrivate>(plot)}
		{
		}
Alexandre Leroux Creates method that will display a tooltip and a tracer with data point information after a while	r481
		void VisualizationGraphRenderingDelegate::onMouseMove(QMouseEvent *event) noexcept
		{
Alexandre Leroux Inits tracers and timer...	r482	// Cancels pending refresh
		impl->m_TracerTimer.disconnect();

Alexandre Leroux Uses Qt tooltips instead of QCPTextItem...	r576	// Reinits tracers
		impl->m_PointTracer->setGraph(nullptr);
		impl->m_PointTracer->setVisible(false);
		impl->m_Plot.replot();

		// Gets the graph under the mouse position
		auto eventPos = event->pos();
		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());

		// Displays point tracer
		impl->m_PointTracer->setGraph(graph);
		impl->m_PointTracer->setGraphKey(graphDataIt->key);
		impl->m_PointTracer->setLayer(
		impl->m_Plot.layer("main")); // Tracer is set on top of the plot's main layer
		impl->m_PointTracer->setVisible(true);
Alexandre Leroux Show tracers method (2)...	r484	impl->m_Plot.replot();
Alexandre Leroux Inits tracers and timer...	r482
Alexandre Leroux Uses Qt tooltips instead of QCPTextItem...	r576	// Starts timer to show tooltip after timeout
		auto showTooltip = [ tooltip = TOOLTIP_FORMAT.arg(key, value), eventPos, this ]()
		{
Alexandre Leroux Shifts tooltip to mouse	r578	QToolTip::showText(impl->m_Plot.mapToGlobal(eventPos) + TOOLTIP_OFFSET, tooltip,
		&impl->m_Plot, TOOLTIP_RECT);
Alexandre Leroux Uses Qt tooltips instead of QCPTextItem...	r576	};

		QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTooltip);
		impl->m_TracerTimer.start();
		}
		}
Alexandre Leroux Creates method that will display a tooltip and a tracer with data point information after a while	r481	}