trackballInfo method
Implementation
@override
TrackballInfo? trackballInfo(Offset position) {
final CartesianChartPoint<D> chartPoint = _chartPoint();
return ChartTrackballInfo<T, D>(
position: points[0],
point: chartPoint,
series: series,
pointIndex: currentSegmentIndex,
seriesIndex: series.index,
lowYPos: series.pointToPixelY(xValue, low),
highYPos: series.pointToPixelY(xValue, high),
highXPos: series.pointToPixelX(xValue, high),
);
}