From cbbd4fd02933f05a460d6e8ebcf2619c99e60b5f Mon Sep 17 00:00:00 2001
From: Will Grant <william.grant@grolloaerospace.com.au>
Date: Wed, 6 Jun 2018 11:20:05 +1000
Subject: [PATCH] allow automatic widening of the  axis limits to the next
 power of 10 with xlim/ylim = :round

---
 src/axes.jl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/axes.jl b/src/axes.jl
index c873086e..f32d0ade 100644
--- a/src/axes.jl
+++ b/src/axes.jl
@@ -441,6 +441,13 @@ function default_should_widen(axis::Axis)
     should_widen
 end
 
+function round_limits(amin,amax)
+    scale = 10^(1-round(log10(amax - amin)))
+    amin = floor(amin*scale)/scale
+    amax = ceil(amax*scale)/scale
+    amin, amax
+end
+
 # using the axis extrema and limit overrides, return the min/max value for this axis
 function axis_limits(axis::Axis, should_widen::Bool = default_should_widen(axis))
     ex = axis[:extrema]
@@ -471,6 +478,8 @@ function axis_limits(axis::Axis, should_widen::Bool = default_should_widen(axis)
         end
     elseif should_widen
         widen(amin, amax)
+    elseif lims == :round
+        round_limits(amin,amax)
     else
         amin, amax
     end