setData method
Implementation
@override
void setData(int index, ChartSegment segment) {
super.setData(index, segment);
segment as WaterfallSegment<T, D>
..series = this
..x = xValues[index]
..top = _highValues[index]
..bottom = _lowValues[index]
..isTotalSum = _totalSumValues[index]
..isIntermediateSum = _intermediateSumValues[index];
}