twinx() not working with PGFPlots

[dancsi]

Hello,
It seems to me that PGFPlots gives an incorrect output when trying to share the same x axis between two plots with twinx(). Here is the sample code

using Plots
pgfplots()
plot(1:10); plot!(twinx(), -(1:10))

Here is the output of PGFPlots:

Here is the generated .tex: pgfplot.txt
For reference, here is the correct output from GR:

[daschw]

That's messed up. Thanks for reporting!

[tzxiong]

I have experienced the same problem today. twinx() works fine for pyplot() and gr() backends, but will black-out the entire background under pgfplots.

[BeastyBlacksmith]

This does not become black, but still is messed up in the pgfplotsx-backend

[pcjentsch]

Any workarounds for this?

[matthieugomez]

I'd be interested in a solution too! It looks like the PGFPlotsX meta-issue #2290 considers the twinx issue as solved, but it's still not working for me (x-axis is slightly different, similarly to #2956 (comment))

[IljaK91]

I have the same problem with the x-axis being not identical for the second plot. Would greatly appreciate a fix :)

[PythonNut]

Any workarounds for this?

I know this is terrible but in the meantime, I just save the tex and edit it by hand to make the axes match.

[BeastyBlacksmith]

The relevant part for layouting is here

Plots.jl/src/backends/pgfplotsx.jl

Lines 120 to 185 in 57ba6aa

	bb1 = sp.plotarea
	bb2 = bbox(sp)
	sp_width = width(bb2)
	sp_height = height(bb2)
	dx, dy = bb2.x0
	lpad = leftpad(sp) + sp[:left_margin]
	rpad = rightpad(sp) + sp[:right_margin]
	tpad = toppad(sp) + sp[:top_margin]
	bpad = bottompad(sp) + sp[:bottom_margin]
	dx += lpad
	dy += tpad
	axis_height = sp_height - (tpad + bpad)
	axis_width = sp_width - (rpad + lpad)
	cstr = plot_color(sp[:background_color_legend])
	a = alpha(cstr)
	fg_alpha = alpha(plot_color(sp[:foreground_color_legend]))
	title_cstr = plot_color(sp[:titlefontcolor])
	title_a = alpha(title_cstr)
	title_loc = sp[:titlelocation]
	bgc_inside = plot_color(sp[:background_color_inside])
	bgc_inside_a = alpha(bgc_inside)
	axis_opt = PGFPlotsX.Options(
	"point meta max" => get_clims(sp)[2],
	"point meta min" => get_clims(sp)[1],
	"legend cell align" => "left",
	"title" => sp[:title],
	"title style" => PGFPlotsX.Options(
	pgfx_get_title_pos(title_loc)...,
	"font" => pgfx_font(
	sp[:titlefontsize],
	pgfx_thickness_scaling(sp),
	),
	"color" => title_cstr,
	"draw opacity" => title_a,
	"rotate" => sp[:titlefontrotation],
	),
	"legend style" => PGFPlotsX.Options(
	pgfx_linestyle(
	pgfx_thickness_scaling(sp),
	sp[:foreground_color_legend],
	fg_alpha,
	"solid",
	) => nothing,
	"fill" => cstr,
	"fill opacity" => a,
	"text opacity" => alpha(plot_color(sp[:legendfontcolor])),
	"font" => pgfx_font(
	sp[:legendfontsize],
	pgfx_thickness_scaling(sp),
	),
	"text" => plot_color(sp[:legendfontcolor]),
	),
	"axis background/.style" => PGFPlotsX.Options(
	"fill" => bgc_inside,
	"opacity" => bgc_inside_a,
	),
	# These are for layouting
	"anchor" => "north west",
	"xshift" => string(dx),
	"yshift" => string(-dy),
	)
	sp_width > 0 * mm ? push!(axis_opt, "width" => string(axis_width)) :
	nothing
	sp_height > 0 * mm ? push!(axis_opt, "height" => string(axis_height)) :
	nothing