From 3f42e9c5bd845184734dae8418b544af7d5b7954 Mon Sep 17 00:00:00 2001
From: Patrick Kofod Mogensen <patrick.mogensen@gmail.com>
Date: Tue, 2 Feb 2016 22:02:31 +0100
Subject: [PATCH 1/3] Add abline! which creates a straight line according to
 the formula b+a*x, and export abline! Also add utility functions
 xmin(plt::Plot) and xmax(plt::Plot).

---
 src/Plots.jl   | 1 +
 src/recipes.jl | 6 ++++++
 src/utils.jl   | 6 ++++++
 3 files changed, 13 insertions(+)

diff --git a/src/Plots.jl b/src/Plots.jl
index feca5ce9b..5dcd596d7 100644
--- a/src/Plots.jl
+++ b/src/Plots.jl
@@ -59,6 +59,7 @@ export
   path3d!,
   scatter3d,
   scatter3d!,
+  abline!,
 
   title!,
   xlabel!,
diff --git a/src/recipes.jl b/src/recipes.jl
index 44ba5d856..45309c124 100644
--- a/src/recipes.jl
+++ b/src/recipes.jl
@@ -130,3 +130,9 @@ function spy{T<:Real}(y::AMat{T}; kw...)
   heatmap(J, I; leg=false, yflip=true, nbins=size(y), kw...)
 end
 
+"Adds a+bx... straight line over the current plot"
+function abline!(plt::Plot, a, b; kw...)
+    plot!(plt, [xmin(plt), xmax(plt)], x -> b + a*x; kw...)
+end
+
+abline!(args...; kw...) = abline!(current(), args...; kw...)
diff --git a/src/utils.jl b/src/utils.jl
index 68f205837..bf97febd4 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -465,3 +465,9 @@ mm2inch(mm::Real) = float(mm / MM_PER_INCH)
 px2mm(px::Real) = float(px * MM_PER_PX)
 mm2px(mm::Real) = float(px / MM_PER_PX)
 
+
+"Smallest x in plot"
+xmin(plt::Plot) = minimum([minimum(d[:x]) for d in plt.seriesargs])
+"Largest x in plot"
+xmax(plt::Plot) = maximum([maximum(d[:x]) for d in plt.seriesargs])
+

From 5c4526725b6a2037abe54ddfc32a216a4d49d777 Mon Sep 17 00:00:00 2001
From: Patrick Kofod Mogensen <patrick.mogensen@gmail.com>
Date: Wed, 3 Feb 2016 10:32:58 +0100
Subject: [PATCH 2/3] Remove trailing spaces.

---
 src/utils.jl | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/utils.jl b/src/utils.jl
index bf97febd4..576f49700 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -246,7 +246,7 @@ function with(f::Function, args...; kw...)
   oldbackend = CURRENT_BACKEND.sym
 
   for arg in args
-    
+
     # change backend?
     if arg in backends()
       backend(arg)
@@ -421,10 +421,10 @@ function supportGraph(allvals, func)
             push!(x, string(b))
             push!(y, string(val))
         end
-      end 
+      end
   end
   n = length(vals)
-  
+
   scatter(x,y,
           m=:rect,
           ms=10,

From 1963fe208e1aa1cba6ddb961cf1dc86e6103c43f Mon Sep 17 00:00:00 2001
From: Patrick Kofod Mogensen <patrick.mogensen@gmail.com>
Date: Wed, 3 Feb 2016 10:35:36 +0100
Subject: [PATCH 3/3] Added an extrema(plt) which return the tuple (xmin,
 xmax), and changed abline! to use extrema.

---
 src/recipes.jl | 4 ++--
 src/utils.jl   | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/recipes.jl b/src/recipes.jl
index 45309c124..adf598729 100644
--- a/src/recipes.jl
+++ b/src/recipes.jl
@@ -132,7 +132,7 @@ end
 
 "Adds a+bx... straight line over the current plot"
 function abline!(plt::Plot, a, b; kw...)
-    plot!(plt, [xmin(plt), xmax(plt)], x -> b + a*x; kw...)
+    plot!(plt, [extrema(plt)...], x -> b + a*x; kw...)
 end
 
-abline!(args...; kw...) = abline!(current(), args...; kw...)
+abline!(args...; kw...) = abline!(current(), args...; kw...)
\ No newline at end of file
diff --git a/src/utils.jl b/src/utils.jl
index 576f49700..904310429 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -471,3 +471,5 @@ xmin(plt::Plot) = minimum([minimum(d[:x]) for d in plt.seriesargs])
 "Largest x in plot"
 xmax(plt::Plot) = maximum([maximum(d[:x]) for d in plt.seriesargs])
 
+"Extrema of x-values in plot"
+Base.extrema(plt::Plot) = (xmin(plt), xmax(plt))
\ No newline at end of file