getHumidityRange method
Get humidity range (min, max).
Implementation
(double min, double max) getHumidityRange() {
final validPoints = data.where((p) => p.humidity != null).toList();
if (validPoints.isEmpty) return (0, 100);
var min = validPoints.first.humidity!.toDouble();
var max = validPoints.first.humidity!.toDouble();
for (final point in validPoints) {
final humidity = point.humidity!.toDouble();
if (humidity < min) min = humidity;
if (humidity > max) max = humidity;
}
return (min, max);
}