widen most seriestypes including logscales

src/arg_desc.jl

@@ -140,5 +140,6 @@ const _arg_desc = KW(
 :gridstyle                => "Symbol. Style of the grid lines. Choose from $(_allStyles)",
 :gridlinewidth            => "Number. Width of the grid lines (in pixels)",
 :tick_direction           => "Symbol.  Direction of the ticks. `:in` or `:out`",
-:showaxis                 => "Bool, Symbol or String.  Show the axis. `true`, `false`, `:show`, `:hide`, `:yes`, `:no`, `:x`, `:y`, `:z`, `:xy`, ..., `:all`, `:off`"
+:showaxis                 => "Bool, Symbol or String.  Show the axis. `true`, `false`, `:show`, `:hide`, `:yes`, `:no`, `:x`, `:y`, `:z`, `:xy`, ..., `:all`, `:off`",
+:widen                    => "Bool. Widen the axis limits by a small factor to avoid cut-off markers and lines at the borders. Defaults to `true`.",
 )

src/args.jl

@@ -382,6 +382,7 @@ const _axis_defaults = KW(
     :gridlinewidth            => 0.5,
     :tick_direction           => :in,
     :showaxis                 => true,
+    :widen                    => true,
 )
 
 const _suppress_warnings = Set{Symbol}([

src/axes.jl

@@ -418,21 +418,23 @@ end
 # -------------------------------------------------------------------------
 
 # push the limits out slightly
-function widen(lmin, lmax)
+function widen(lmin, lmax, scale = :identity)
-    span = lmax - lmin
+    f, invf = scalefunc(scale), invscalefunc(scale)
+    span = f(lmax) - f(lmin)
     # eps = NaNMath.max(1e-16, min(1e-2span, 1e-10))
     eps = NaNMath.max(1e-16, 0.03span)
-    lmin-eps, lmax+eps
+    invf(f(lmin)-eps), invf(f(lmax)+eps)
 end
 
-# figure out if widening is a good idea.  if there's a scale set it's too tricky,
+# figure out if widening is a good idea.
-# so lazy out and don't widen
+const _widen_seriestypes = (:line, :path, :steppre, :steppost, :sticks, :scatter, :barbins, :barhist, :histogram, :scatterbins, :scatterhist, :stepbins, :stephist, :bins2d, :histogram2d, :bar, :shape, :path3d, :scatter3d)
+
 function default_should_widen(axis::Axis)
     should_widen = false
-    if axis[:scale] == :identity && !is_2tuple(axis[:lims])
+    if !is_2tuple(axis[:lims])
         for sp in axis.sps
             for series in series_list(sp)
-                if series.d[:seriestype] in (:scatter,) || series.d[:markershape] != :none
+                if series.d[:seriestype] in _widen_seriestypes
                     should_widen = true
                 end
             end
@@ -476,8 +478,8 @@ function axis_limits(axis::Axis, should_widen::Bool = default_should_widen(axis)
         else
             amin, amax
         end
-    elseif should_widen
+    elseif should_widen && axis[:widen]
-        widen(amin, amax)
+        widen(amin, amax, axis[:scale])
     elseif lims == :round
         round_limits(amin,amax)
     else