Add :symlog_threshold

Author: pjaap

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [1.17.0]
 - Add `:symlog` axis scaling for symmetric logarithmic axis scaling, see, e.g. [matplotlib symlog](https://matplotlib.org/stable/gallery/scales/symlog_demo.html)
+- Add `:symlog_threshold` (default = 10.0) to determine when to switch from linear to log scaling in case of `:symlog` scaling
 
 ## [1.16.3] - 2026-01-07
 - Add `title`, `xlabel`, and `ylabel` to 1D and 2D `gridplot!` with `GLMakie`

ext/GridVisualizeMakieExt.jl

@@ -477,15 +477,15 @@ function scalarplot!(ctx, TP::Type{MakieType}, ::Type{Val{1}}, grids, parentgrid
         if ctx[:xscale] == :log
             xscale = log10
         elseif ctx[:xscale] == :symlog
-            xscale = XMakie.Makie.pseudolog10
+            xscale = XMakie.Makie.Makie.Symlog10(ctx[:symlog_threshold])
         else
             xscale = identity
         end
 
         if ctx[:yscale] == :log
             yscale = log10
         elseif ctx[:yscale] == :symlog
-            yscale = XMakie.Makie.pseudolog10
+            yscale = XMakie.Makie.Makie.Symlog10(ctx[:symlog_threshold])
         else
             yscale = identity
         end

src/dispatch.jl

@@ -386,6 +386,7 @@ function default_plot_kwargs()
         :spacing => Pair(nothing, "Removed from API"),
         :species => Pair(1, "Number of species to plot or number of species in regions"),
         :subplot => Pair((1, 1), "Private: Actual subplot"),
+        :symlog_threshold => Pair(10.0, ":symlog threshold for switching from linear to log scaling. Only relevant for :symlog axis scaling."),
         :title => Pair("", "Plot title"),
         :tetxplane_tol => Pair(0.0, "tolerance for tet-plane intersection in 3D"),
         :vconstant => Pair(false, "Set all arrow length constant in vector plot"),

src/pycommon.jl

@@ -438,9 +438,9 @@ function scalarplot!(ctx, TP::Type{T}, ::Type{Val{1}}, grids, parentgrid, funcs)
 
     # activate log scaling
     ctx[:xscale] == :log && ax.set_xscale("log")
-    ctx[:xscale] == :symlog && ax.set_xscale("symlog")
+    ctx[:xscale] == :symlog && ax.set_xscale("symlog", linthresh = ctx[:symlog_threshold])
     ctx[:yscale] == :log && ax.set_yscale("log")
-    ctx[:yscale] == :symlog && ax.set_yscale("symlog")
+    ctx[:yscale] == :symlog && ax.set_yscale("symlog", linthresh = ctx[:symlog_threshold])
 
     pplot = ax.plot