stage
Compose all three late-binding lanes for a single aesthetic.
start (column name) names the column used during initial scale training, before the stat runs. after-stat (string column name or (row, ctx) => any) takes effect after the stat. after-scale ((value, ctx) => any) post-transforms the channel’s resolved scale value just before draw. Any lane may be none.
Usage
stage(
start: none,
after-stat: none,
after-scale: none,
)Parameters
| Parameter | Default | Description |
|---|---|---|
start |
none |
Column name used for initial training, or none. |
after-stat |
none |
Post-stat expression, or none. |
after-scale |
none |
Post-scale closure, or none. |
Returns
Late-binding marker consumed by aes.
Examples
Train the outline colour on the same column as fill, then darken the resolved swatch per row.
#let d = (
(x: 1, y: 2, sp: "a"),
(x: 2, y: 4, sp: "b"),
(x: 3, y: 3, sp: "c"),
(x: 4, y: 5, sp: "a"),
)
#plot(
data: d,
mapping: aes(
x: "x", y: "y", fill: "sp",
colour: stage(start: "sp", after-scale: (c, _) => c.darken(40%)),
),
layers: (geom-point(size: 5pt, stroke: 0.8pt),),
width: 10cm,
height: 6cm,
)
