axvline

Guides & annotation

Minimal call

import math
xs = [i * 0.2 for i in range(40)]
df = {"x": xs, "y": [math.sin(x) for x in xs]}

c = pt.chart(df, aes(x="x", y="y"))
c.add_line()
c.add_axvline(math.pi, color="#C44E52", linestyle=":")

Docstring

Reference-line / span artists — decorate the frame.

`axhline` / `axvline` / `axhspan` / `axvspan` ignore autoscaling and span
the full frame regardless of the data scale. `axline` is the arbitrary-
direction sibling (matplotlib `axline` / ggplot `geom_abline`):

  c.add_axline((0, 0), (1, 1))          # infinite line through two points
  c.add_axline((0, 0), slope=1)         # point + slope (linear scales only)

`hlines` / `vlines` are the bounded, data-coordinate counterparts that
participate in autoscaling and use the color cycle so a labeled call acts
like a series.