alignLayer(layer, dataSet)

Aligns the layer with a data set of another bar chart layer in Side layout.

The Side layout is a layout method specific to the bar chart layer. In this layout method, multiple bars belonging to the same x-position are laid out side by side. Thus the bars are not centered exactly on the x-position, but are shifted. The shift amount depends on the data set numbers of the bars.

In some cases, it may be necessary to overlay another layer (eg. a line chart layer, or a box-whisker chart layer) on top of the bars. The alignLayer method ensures the data points are shifted by the same amount as a given data set on a given BarLayer.

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