getBarWidth method

Implementation

double getBarWidth() {
  if (_dataPoints.isEmpty) {
    return 0;
  }
  var barCount = _dataPoints.values.first.length;
  for (var v in _dataPoints.values) {
    if (v.length > barCount) barCount = v.length;
  }
  return (singleBarWidth * barCount + barMargin * (barCount - 1)).toDouble();
}