stat-align
Align statistic: resample each group onto a shared x-grid.
Builds the union of every group’s x values plus zero-crossings within each group, deduped and sorted. Each group’s y is linearly interpolated onto that grid; rows outside a group’s input range are dropped, and the trimmed extremes are padded with y = 0 so stacked areas join cleanly between groups.
Usage
stat-align()Returns
Statistic object with name: "align", consumed by geom layers.
Outputs
x.y.
Examples
Two groups with mismatched x sampled onto a stacked area.
#let d = (
(x: 0, y: 1, k: "a"), (x: 2, y: 3, k: "a"), (x: 4, y: 2, k: "a"),
(x: 1, y: 2, k: "b"), (x: 3, y: 1, k: "b"), (x: 5, y: 4, k: "b"),
)
#plot(
data: d,
mapping: aes(x: "x", y: "y", fill: "k"),
layers: (geom-area(stat: stat-align(), position: "stack"),),
width: 12cm,
height: 6cm,
)
