zoomToIndexRange method
Implementation
void zoomToIndexRange(
int start,
int end,
int totalPoints, {
String label = 'Zoom',
}) {
if (_disposed) return;
if (totalPoints <= 1) return;
final s = start / (totalPoints - 1);
final e = end / (totalPoints - 1);
zoomToRange(s, e, label: label);
}