handlePointerHover method
Implementation
void handlePointerHover(Offset localPosition) {
final int nearestPointIndex = _nearestPointIndex(localPosition);
if (nearestPointIndex != -1) {
final TooltipInfo? info = tooltipInfo(pointIndex: nearestPointIndex);
if (info != null) {
series!.parent!.behaviorArea!.raiseTooltip(info);
}
}
}