createRenderer method
Create the range area series renderer.
Implementation
RangeAreaSeriesRenderer createRenderer(ChartSeries<T, D> series) {
RangeAreaSeriesRenderer seriesRenderer;
if (onCreateRenderer != null) {
seriesRenderer = onCreateRenderer!(series) as RangeAreaSeriesRenderer;
// ignore: unnecessary_null_comparison
assert(seriesRenderer != null,
'This onCreateRenderer callback function should return value as extends from ChartSeriesRenderer class and should not be return value as null');
return seriesRenderer;
}
return RangeAreaSeriesRenderer();
}