Method findClosestDataPoint

src/openms_gui/source/VISUAL/LayerData1DChrom.cpp:39–72

  }

  PeakIndex LayerData1DChrom::findClosestDataPoint(const RangeAllType& area) const
  {
    ChromatogramPeak peak_lt {area.getMinRT(), area.getMinIntensity()}, peak_rb {area.getMaxRT(), area.getMaxIntensity()};
    // reference to the current data
    const auto& chrom = getCurrentChrom();
    const Size index = getCurrentIndex();

    // get iterator on first peak with lower position than interval_start
    auto left_it = lower_bound(chrom.begin(), chrom.end(), peak_lt, ChromatogramPeak::PositionLess());

    // get iterator on first peak with higher position than interval_end
    auto right_it = lower_bound(left_it, chrom.end(), peak_rb, ChromatogramPeak::PositionLess());

    if (left_it == right_it) // both are equal => no peak falls into this interval
    {
      return PeakIndex();
    }

    if (left_it == right_it - 1)
    {
      return PeakIndex(index, left_it - chrom.begin());
    }

    auto nearest_it = left_it;
    const auto center_intensity = (peak_lt.getIntensity() + peak_rb.getIntensity()) * 0.5;
    for (auto it = left_it; it != right_it; ++it)
    {
      if (abs(center_intensity - it->getIntensity()) < abs(center_intensity - nearest_it->getIntensity()))
      {
        nearest_it = it;
      }
    }
    return PeakIndex(index, nearest_it - chrom.begin());
  }

  std::unique_ptr<Painter1DBase> LayerData1DChrom::getPainter1D() const
  {