add docstring for RefLine

Author: sl-solution

src/charts/refline.jl

@@ -1,12 +1,10 @@
-REFLINE_DEFAULT = Dict{Symbol, Any}(:values => 0,  # the position of refline, it can be a vector of values
-                                    :axis => nothing, # which axis should be used to draw refline, :xaxis, :x2axis, :yaxis, :y2axis
-                                    :opacity=>1,
-                                    :thickness=>1,
-                                    :color=>"gray",
-                                    :dash=>[0],
+"""
+    RefLine(args...)
 
-                                    :clip=>nothing
-                                    )
+Represent a Refline with given arguments.
+
+$(print_doc(REFLINE_DEFAULT))
+"""
 mutable struct RefLine <: SGMarks
     opts
     function RefLine(;opts...)

src/kwds.jl

@@ -288,5 +288,16 @@ DENSITY_DEFAULT = SGKwds(
 
     :legend => __dic(:default=> nothing, :__ord=>6, :__cat=>"Legend", :__doc=>Kwds_docs[:legend]),
 
+    :clip => __dic(:default=> nothing, :__ord=>7, :__cat=>"Miscellaneous", :__doc=>Kwds_docs[:clip]),
+)
+
+REFLINE_DEFAULT = SGKwds(
+    :values => __dic(:default=> 0, :__ord=>0, :__cat => "Required", :__doc=>"The position of reflines, it can be a vector of values."),
+    :axis => __dic(:default=> nothing, :__ord=>0, :__cat => "Required", :__doc=>"WHich axis should be used to draw the reflines, i.e. `:xaxis`, `:x2axis`, `:yaxis`, `:y2axis`."),
+    
+    :opacity => __dic(:default=> 1, :__ord=>3, :__cat=>"Refline appearance", :__doc=>Kwds_docs[:opacity]),
+    :thickness => __dic(:default=> 1, :__ord=>3, :__cat=>"Refline appearance", :__doc=>"The line thickness."),
+    :color => __dic(:default=> :grey, :__ord=>3, :__cat=>"Refline appearance", :__doc=>Kwds_docs[:color_grad]),
+    :dash => __dic(:default=> [0], :__ord=>3, :__cat=>"Refline appearance", :__doc=>"The line dash style."),
     :clip => __dic(:default=> nothing, :__ord=>7, :__cat=>"Miscellaneous", :__doc=>Kwds_docs[:clip]),
 )