get_region_data()

std::vector< DataVariant > MayaFlux::Kakshya::PlotContainer::get_region_data ( const Region &  region ) const

overridevirtual

Extract a sample range from a single series.

region.start_coordinates[0] = series index. region.start_coordinates[1] = first sample (inclusive). region.end_coordinates[1] = last sample (inclusive).

Returns a single DataVariant containing vector<double> of the slice. Returns empty if coordinates are out of range.

Implements MayaFlux::Kakshya::NDDataContainer< DataVariant >.

Definition at line 247 of file PlotContainer.cpp.

{
    if (region.start_coordinates.empty() || region.end_coordinates.empty())
        return {};
 
    const auto series_idx = static_cast<size_t>(region.start_coordinates[0]);
    if (series_idx >= m_data.size())
        return {};
 
    std::optional<std::vector<DataVariant>> result;
    seqlock_read_void(m_series_locks[series_idx], 8, [&] {
        const auto* src = std::get_if<std::vector<double>>(&m_data[series_idx]);
        if (!src || src->empty())
            return;
        const uint64_t s = (region.start_coordinates.size() > 1) ? region.start_coordinates[1] : 0;
        const uint64_t e = (region.end_coordinates.size() > 1)
            ? std::min(region.end_coordinates[1], static_cast<uint64_t>(src->size() - 1))
            : static_cast<uint64_t>(src->size() - 1);
        if (s > e)
            return;
        std::vector<double> slice(src->begin() + static_cast<ptrdiff_t>(s),
            src->begin() + static_cast<ptrdiff_t>(e + 1));
        result = { DataVariant(std::move(slice)) };
    });
 
    return result.value_or(std::vector<DataVariant> {});
}

References MayaFlux::Kakshya::Region::end_coordinates, m_data, m_series_locks, src, and MayaFlux::Kakshya::Region::start_coordinates.

Referenced by get_region_group_data().

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