[BUG] using vline results in wrong ylim

[Volker-Weissmann]

Details

using Plots
p = plot()
vline!(p, [2])
plot!(p, [1,2,3], [-0.1, -0.2, -0.3])
savefig(p, "bug.pdf")

The y-axis goes from -0.35 to 2, but it should go from -0.35 to 0. If you swap the order of the vline! and the plot! call, it works.

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	x
pyplot			x
plotlyjs			x
pgfplotsx			x
unicodeplots			x
inspectdr			x
gaston			x

Versions

Plots.jl version: Plots v1.15.2
Backend version (]st -m <backend(s)>): GR v0.57.4
Output of versioninfo():

Julia Version 1.6.3
Commit ae8452a9e0* (2021-09-23 17:34 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, skylake)
Environment:
  JULIA_EDITOR = code
  JULIA_NUM_THREADS = 

[BeastyBlacksmith]

but it should go from -0.35 to 0

How could vline know this when there is no data available? It falls back to its default range [1,2] and then that gets expanded to fit the other data. If you know already what the range should be when calling vline you can specify by passing ylims = (0, -0.35).

[Volker-Weissmann]

I could also guess that the origin was vline defaulting to [1,2].
I can't tell you how to fix the bug, without knowledge about Plots.jl architecture.

[pablosaa]

I found an apparently new bug using vline and DateTime format in the x-axis:
plot(rs[:time], tir[:IRT], size=(800,300))

but when adding a vline as :
vline!([DateTime(2020,4,15, 12)])
it changes the y-axis label as shown below:

I can confirm that I've worked with vline() and DateTime as x-axis data format regularly before and it used to work flawlessly before updating Plots.jl to v1.38.4 , for Julia Version 1.8.0

[t-bltg]

Could you please open a new issue ?

[AraujoH]

I'm facing the same issue @pablosaa is facing. Adding a vline! with DateTime x-axis results in a change of values in the y-axis.

[pablosaa]

I'm facing the same issue @pablosaa is facing. Adding a vline! with DateTime x-axis results in a change of values in the y-axis.

@AraujoH you might want to update Plots.jl to version 1.38.16 or the latest 1.38.17, where that issue has been solved.