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Version: 5.2.1

Spline

The Spline series is a point-line series with an automatic polynomial interpolation that produces smooth curves. This is simply a differently styled instance of PointLineAreaSeries.

Chart with spline seriesChart with spline series

// Creation of a spline series
const splineSeries = chart.addPointLineAreaSeries({ dataPattern: 'ProgressiveX' })
    .setAreaFillStyle(emptyFill)
    .setCurvePreprocessing({ type: 'spline' })

For "points" oriented guides, please refer to Scatter section.

Otherwise, the spline series functions exactly same as a Line series.