Scale

<Chart scale={[0, max()]}>
  <Scale ticks={every(5, { ends: true })}>{Mark}</Scale>
  <Plot …>{Row}</Plot>
</Chart>

A Scale is a Plot of ticks from the Chart’s scale. Its row is drawn once per tick, and all its rows share one band that covers the chart. A Chart with a Scale in it draws no axis of its own.

Prop	Default	What it does
ticks	about 5	a list of values, a rough count, or a function of [min, max] such as every(5)
other props		data for the rows, as in a Plot
class		the Scale’s element

What a tick’s row gets

d.at	the tick’s value
d.next	the next tick’s value (the scale’s end after the last tick): fill the space between two ticks
d.first, d.last	true for the first and last ticks
d.toEnd	the distance from the tick to the scale’s end, in px: leave out a number that would crowd the end

A tick keeps its row while the scale changes, so a tick at 20 stays the same element as the scale grows. The ticks at the two ends of the scale are always the same two rows, so the end line never slides.