From 566946f33c11163fa248092443937505f7790308 Mon Sep 17 00:00:00 2001
From: Simon Christ <SimonChrist@gmx.de>
Date: Thu, 12 Nov 2020 12:04:22 +0100
Subject: [PATCH] prototype

---
 src/args.jl               |  6 +++++-
 src/backends/pgfplotsx.jl | 11 +++++++++++
 src/components.jl         | 12 ++++++++++++
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/args.jl b/src/args.jl
index ab8f1329..6e1b3ec8 100644
--- a/src/args.jl
+++ b/src/args.jl
@@ -1667,13 +1667,17 @@ function convertLegendValue(val::Symbol)
         :inline,
     )
         val
+    elseif val == :horizontal
+        -1
     else
         error("Invalid symbol for legend: $val")
     end
 end
+convertLegendValue(val::Real) = val
 convertLegendValue(val::Bool) = val ? :best : :none
 convertLegendValue(val::Nothing) = :none
-convertLegendValue(v::Tuple{S,T}) where {S<:Real,T<:Real} = v
+convertLegendValue(v::Union{Tuple, NamedTuple}) = convertLegendValue.(v)
+convertLegendValue(v::Tuple{S,T}) where {S<:Real, T<:Real} = v
 convertLegendValue(v::Tuple{<:Real,Symbol}) = v
 convertLegendValue(v::Real) = v
 convertLegendValue(v::AbstractArray) = map(convertLegendValue, v)
diff --git a/src/backends/pgfplotsx.jl b/src/backends/pgfplotsx.jl
index d5206e1e..6bcb694f 100644
--- a/src/backends/pgfplotsx.jl
+++ b/src/backends/pgfplotsx.jl
@@ -145,6 +145,8 @@ function (pgfx_plot::PGFPlotsXPlot)(plt::Plot{PGFPlotsXBackend})
             axis_opt = PGFPlotsX.Options(
                 "point meta max" => get_clims(sp)[2],
                 "point meta min" => get_clims(sp)[1],
+                "legend cell align" => "left",
+                "legend columns" => pgfx_legend_col(sp[:legend]),
                 "title" => sp[:title],
                 "title style" => PGFPlotsX.Options(
                     pgfx_get_title_pos(title_loc)...,
@@ -949,6 +951,15 @@ function pgfx_linestyle(linewidth::Real, color, α = 1, linestyle = :solid)
     )
 end
 
+function pgfx_legend_col(s::Symbol)
+    if s == :horizontal
+        return -1
+    end
+    return 1
+end
+pgfx_legend_col(n) = n
+
+
 function pgfx_linestyle(plotattributes, i = 1)
     lw = pgfx_thickness_scaling(plotattributes) * get_linewidth(plotattributes, i)
     lc = single_color(get_linecolor(plotattributes, i))
diff --git a/src/components.jl b/src/components.jl
index 6786b98e..75088ba1 100644
--- a/src/components.jl
+++ b/src/components.jl
@@ -772,3 +772,15 @@ function extrema_plus_buffer(v, buffmult = 0.2)
     buffer = vdiff * buffmult
     vmin - buffer, vmax + buffer
 end
+
+### Legend
+
+@add_annotations subplot struct Legend
+    background_color
+    foreground_color
+    position
+    title
+    font::Font # TODO: check if macro is recursive enough
+    title_font
+    column
+end