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

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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");

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

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
      /// Timeout after which a tracer is displayed

      const auto TRACER_TIMEOUT = 500;

        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);

          tracer.setStyle(QCPItemTracer::tsPlus);

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

          tracer.setBrush(Qt::black);

          tracer.setSize(10);

      }

      void initTextTracerStyle(QCPItemText &tracer) noexcept

      {

          tracer.setPen(QPen{Qt::gray});

          tracer.setBrush(Qt::white);

          tracer.setPadding(QMargins{6, 6, 6, 6});

          tracer.setPositionAlignment(Qt::AlignTop | Qt::AlignLeft);

          tracer.setTextAlignment(Qt::AlignLeft);

      }

        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)

                  : m_Plot{plot},

                    m_PointTracer{new QCPItemTracer{&plot}},

                    m_TextTracer{new QCPItemText{&plot}},

                    m_TracerTimer{}

          {

        Alexandre Leroux
    
Sets tracers' styles

              r485
            
              initPointTracerStyle(*m_PointTracer);

              initTextTracerStyle(*m_TextTracer);

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
              m_TracerTimer.setInterval(TRACER_TIMEOUT);

              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;

          QCPItemText *m_TextTracer;

          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();

          auto showTracers = [ eventPos = event->pos(), this ]()

          {

        Alexandre Leroux
    
Show tracers method (2)...

              r484
            
              // Lambda function to display a tracer

              auto displayTracer = [this](auto &tracer) {

                  // Tracer is set on top of the plot's main layer

                  tracer.setLayer(impl->m_Plot.layer("main"));

                  tracer.setVisible(true);

                  impl->m_Plot.replot();

              };

        Alexandre Leroux
    
Show tracers method (1)...

              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));

        Alexandre Leroux
    
Show tracers method (2)...

              r484
            
                      // Displays point tracer

                      impl->m_PointTracer->setGraph(graph);

        Alexandre Leroux
    
Fixes tooltip imprecision

              r494
            
                      impl->m_PointTracer->setGraphKey(graphDataIt->key);

        Alexandre Leroux
    
Show tracers method (2)...

              r484
            
                      displayTracer(*impl->m_PointTracer);

                      // Displays text tracer

                      auto tracerPosition = impl->m_TextTracer->position;

                      tracerPosition->setAxes(graph->keyAxis(), graph->valueAxis());

                      tracerPosition->setCoords(impl->m_PointTracer->position->key(),

                                                impl->m_PointTracer->position->value());

                      displayTracer(*impl->m_TextTracer);

                  }

        Alexandre Leroux
    
Show tracers method (1)...

              r483
            
              }

        Alexandre Leroux
    
Inits tracers and timer...

              r482
            
          };

          // Starts the timer to display tracers at timeout

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

          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");

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

Alexandre Leroux Inits tracers and timer...	r482	/// Timeout after which a tracer is displayed
		const auto TRACER_TIMEOUT = 500;

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);
		tracer.setStyle(QCPItemTracer::tsPlus);
		tracer.setPen(QPen(Qt::black));
		tracer.setBrush(Qt::black);
		tracer.setSize(10);
		}

		void initTextTracerStyle(QCPItemText &tracer) noexcept
		{
		tracer.setPen(QPen{Qt::gray});
		tracer.setBrush(Qt::white);
		tracer.setPadding(QMargins{6, 6, 6, 6});
		tracer.setPositionAlignment(Qt::AlignTop \| Qt::AlignLeft);
		tracer.setTextAlignment(Qt::AlignLeft);
		}

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)
		: m_Plot{plot},
		m_PointTracer{new QCPItemTracer{&plot}},
		m_TextTracer{new QCPItemText{&plot}},
		m_TracerTimer{}
		{
Alexandre Leroux Sets tracers' styles	r485	initPointTracerStyle(*m_PointTracer);
		initTextTracerStyle(*m_TextTracer);
Alexandre Leroux Inits tracers and timer...	r482
		m_TracerTimer.setInterval(TRACER_TIMEOUT);
		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;
		QCPItemText *m_TextTracer;
		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();

		auto showTracers = [ eventPos = event->pos(), this ]()
		{
Alexandre Leroux Show tracers method (2)...	r484	// Lambda function to display a tracer
		auto displayTracer = [this](auto &tracer) {
		// Tracer is set on top of the plot's main layer
		tracer.setLayer(impl->m_Plot.layer("main"));
		tracer.setVisible(true);
		impl->m_Plot.replot();
		};

Alexandre Leroux Show tracers method (1)...	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));
Alexandre Leroux Show tracers method (2)...	r484
		// Displays point tracer
		impl->m_PointTracer->setGraph(graph);
Alexandre Leroux Fixes tooltip imprecision	r494	impl->m_PointTracer->setGraphKey(graphDataIt->key);
Alexandre Leroux Show tracers method (2)...	r484	displayTracer(*impl->m_PointTracer);

		// Displays text tracer
		auto tracerPosition = impl->m_TextTracer->position;
		tracerPosition->setAxes(graph->keyAxis(), graph->valueAxis());
		tracerPosition->setCoords(impl->m_PointTracer->position->key(),
		impl->m_PointTracer->position->value());
		displayTracer(*impl->m_TextTracer);
		}
Alexandre Leroux Show tracers method (1)...	r483	}
Alexandre Leroux Inits tracers and timer...	r482	};

		// Starts the timer to display tracers at timeout
		QObject::connect(&impl->m_TracerTimer, &QTimer::timeout, showTracers);
		impl->m_TracerTimer.start();
Alexandre Leroux Creates method that will display a tooltip and a tracer with data point information after a while	r481	}