Method candlestickSelectTest

src/qt/qcustomplot.cpp:26895–26959

! \internal This method is a helper function for \ref selectTest. It is used to test for selection when the chart style is \ref csCandlestick. It only tests against the data points between \a begin and \a end. Like \ref selectTest, this method returns the shortest distance of \a pos to the graphical representation of the plottable, and \a closestDataPoint will point to the respecti

  representation of the plottable, and \a closestDataPoint will point to the respective data point.
*/
double QCPFinancial::candlestickSelectTest(const QPointF &pos, const QCPFinancialDataContainer::const_iterator &begin, const QCPFinancialDataContainer::const_iterator &end, QCPFinancialDataContainer::const_iterator &closestDataPoint) const
{
  closestDataPoint = mDataContainer->constEnd();
  QCPAxis *keyAxis = mKeyAxis.data();
  QCPAxis *valueAxis = mValueAxis.data();
  if (!keyAxis || !valueAxis) { qDebug() << Q_FUNC_INFO << "invalid key or value axis"; return -1; }

  double minDistSqr = std::numeric_limits<double>::max();
  if (keyAxis->orientation() == Qt::Horizontal)
  {
    for (QCPFinancialDataContainer::const_iterator it=begin; it!=end; ++it)
    {
      double currentDistSqr;
      // determine whether pos is in open-close-box:
      QCPRange boxKeyRange(it->key-mWidth*0.5, it->key+mWidth*0.5);
      QCPRange boxValueRange(it->close, it->open);
      double posKey, posValue;
      pixelsToCoords(pos, posKey, posValue);
      if (boxKeyRange.contains(posKey) && boxValueRange.contains(posValue)) // is in open-close-box
      {
        currentDistSqr = mParentPlot->selectionTolerance()*0.99 * mParentPlot->selectionTolerance()*0.99;
      } else
      {
        // calculate distance to high/low lines:
        double keyPixel = keyAxis->coordToPixel(it->key);
        double highLineDistSqr = QCPVector2D(pos).distanceSquaredToLine(QCPVector2D(keyPixel, valueAxis->coordToPixel(it->high)), QCPVector2D(keyPixel, valueAxis->coordToPixel(qMax(it->open, it->close))));
        double lowLineDistSqr = QCPVector2D(pos).distanceSquaredToLine(QCPVector2D(keyPixel, valueAxis->coordToPixel(it->low)), QCPVector2D(keyPixel, valueAxis->coordToPixel(qMin(it->open, it->close))));
        currentDistSqr = qMin(highLineDistSqr, lowLineDistSqr);
      }
      if (currentDistSqr < minDistSqr)
      {
        minDistSqr = currentDistSqr;
        closestDataPoint = it;
      }
    }
  } else // keyAxis->orientation() == Qt::Vertical
  {
    for (QCPFinancialDataContainer::const_iterator it=begin; it!=end; ++it)
    {
      double currentDistSqr;
      // determine whether pos is in open-close-box:
      QCPRange boxKeyRange(it->key-mWidth*0.5, it->key+mWidth*0.5);
      QCPRange boxValueRange(it->close, it->open);
      double posKey, posValue;
      pixelsToCoords(pos, posKey, posValue);
      if (boxKeyRange.contains(posKey) && boxValueRange.contains(posValue)) // is in open-close-box
      {
        currentDistSqr = mParentPlot->selectionTolerance()*0.99 * mParentPlot->selectionTolerance()*0.99;
      } else
      {
        // calculate distance to high/low lines:
        double keyPixel = keyAxis->coordToPixel(it->key);
        double highLineDistSqr = QCPVector2D(pos).distanceSquaredToLine(QCPVector2D(valueAxis->coordToPixel(it->high), keyPixel), QCPVector2D(valueAxis->coordToPixel(qMax(it->open, it->close)), keyPixel));
        double lowLineDistSqr = QCPVector2D(pos).distanceSquaredToLine(QCPVector2D(valueAxis->coordToPixel(it->low), keyPixel), QCPVector2D(valueAxis->coordToPixel(qMin(it->open, it->close)), keyPixel));
        currentDistSqr = qMin(highLineDistSqr, lowLineDistSqr);
      }
      if (currentDistSqr < minDistSqr)
      {