xTickXs property
X coordinates of x ticks (x tick - middle of column, also middle of label). Once XContainer.layout and YContainer.layout are complete, this list drives the layout of DataContainer.
See AxisLabelContainer.parentOffsetTick for details.
Implementation
List<double> get xTickXs =>
xContainer._xLabelContainers.map((var xLabelContainer) => xLabelContainer.parentOffsetTick).toList();