proper handling of colors

src/Plots.jl

@@ -39,6 +39,7 @@ const IMG_DIR = "$(ENV["HOME"])/.julia/v0.4/Plots/img/"
 type Plot
   o  # the underlying object
   plotter::PlottingPackage
+  n::Int # number of series
 end
 
 

src/args.jl

@@ -54,7 +54,7 @@ makeplural(s::Symbol) = Symbol(string(s,"s"))
 autocolor(idx::Integer) = COLORS[mod1(idx,NUMCOLORS)]
 
 
-function getPlotKeywordArgs(kw, i::Int)
+function getPlotKeywordArgs(kw, i::Int, plt = nothing)
   d = Dict(kw)
   outd = Dict()
 
@@ -69,6 +69,16 @@ function getPlotKeywordArgs(kw, i::Int)
     end
   end
 
+  # auto assign a color
+  if plt != nothing
+    if outd[:color] == :auto
+      outd[:color] = autocolor(plt.n)
+    end
+    if outd[:markercolor] == :auto
+      outd[:markercolor] = outd[:color]
+    end
+  end
+
   outd
 end
 

src/gadfly.jl

@@ -11,7 +11,7 @@ function plot(pkg::GadflyPackage; kw...)
   plt.mapping = Dict()
   plt.data_source = DataFrames.DataFrame()
   plt.layers = plt.layers[1:0]
-  Plot(plt, pkg)
+  Plot(plt, pkg, 0)
 end
 
 
@@ -44,14 +44,20 @@ function plot!(::GadflyPackage, plt::Plot; kw...)
   # label
   
   # color
-  if d[:color] == :auto
+  c = d[:color]
-    color = convert(RGB{Float32}, autocolor(length(plt.o.layers)+1))
+  if isa(c, Symbol)
+    c = string(c)
   end
+  if isa(c, String)
+    c = parse(Colorant, c)
+  end
+  @assert isa(c, RGB)
+  push!(gfargs, Gadfly.Theme(default_color=c))
 
   # legend
   # guides (x/y labels, title, background, ticks)
 
-  append!(plt.o.layers, Gadfly.layer(unique(gfargs)...; x = d[:x], y = d[:y], color = [color]))
+  append!(plt.o.layers, Gadfly.layer(unique(gfargs)...; x = d[:x], y = d[:y]))
   plt
 end
 

src/plot.jl

@@ -126,6 +126,12 @@ end
 
 # this adds to a specific plot... most plot commands will flow through here
 function plot!(plt::Plot, args...; kw...)
+
+  # increment n if we're going directly to the package's plot method
+  if length(args) == 0
+    plt.n += 1
+  end
+
   plot!(plt.plotter, plt, args...; kw...)
   currentPlot!(plt)
 
@@ -148,18 +154,21 @@ end
 # These methods are various ways to add to an existing plot
 
 function plot!(pkg::PlottingPackage, plt::Plot, y::AVec; kw...)
-  plot!(pkg, plt; x = 1:length(y), y = y, getPlotKeywordArgs(kw, 1)...)
+  plt.n += 1
+  plot!(pkg, plt; x = 1:length(y), y = y, getPlotKeywordArgs(kw, 1, plt)...)
 end
 
 function plot!(pkg::PlottingPackage, plt::Plot, x::AVec, y::AVec; kw...)              # one line (will assert length(x) == length(y))
   @assert length(x) == length(y)
-  plot!(pkg, plt; x=x, y=y, getPlotKeywordArgs(kw, 1)...)
+  plt.n += 1
+  plot!(pkg, plt; x=x, y=y, getPlotKeywordArgs(kw, 1, plt)...)
 end
 
 function plot!(pkg::PlottingPackage, plt::Plot, y::AMat; kw...)                       # multiple lines (one per column of x), all sharing x = 1:size(y,1)
   n,m = size(y)
   for i in 1:m
-    plot!(pkg, plt; x = 1:n, y = y[:,i], getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = 1:n, y = y[:,i], getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
@@ -168,7 +177,8 @@ function plot!(pkg::PlottingPackage, plt::Plot, x::AVec, y::AMat; kw...)
   n,m = size(y)
   for i in 1:m
     @assert length(x) == n
-    plot!(pkg, plt; x = x, y = y[:,i], getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = x, y = y[:,i], getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
@@ -176,33 +186,37 @@ end
 function plot!(pkg::PlottingPackage, plt::Plot, x::AMat, y::AMat; kw...)              # multiple lines (one per column of x/y... will assert size(x) == size(y))
   @assert size(x) == size(y)
   for i in 1:size(x,2)
-    plot!(pkg, plt; x = x[:,i], y = y[:,i], getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = x[:,i], y = y[:,i], getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
 
 function plot!(pkg::PlottingPackage, plt::Plot, x::AVec, f::Function; kw...)          # one line, y = f(x)
-  plot!(pkg, plt; x = x, y = map(f,x), getPlotKeywordArgs(kw, 1)...)
+  plot!(pkg, plt; x = x, y = map(f,x), getPlotKeywordArgs(kw, 1, plt)...)
 end
 
 function plot!(pkg::PlottingPackage, plt::Plot, x::AMat, f::Function; kw...)          # multiple lines, yᵢⱼ = f(xᵢⱼ)
   for i in 1:size(x,2)
     xi = x[:,i]
-    plot!(pkg, plt; x = xi, y = map(f, xi), getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = xi, y = map(f, xi), getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
 
 function plot!(pkg::PlottingPackage, plt::Plot, x::AVec, fs::AVec{Function}; kw...)   # multiple lines, yᵢⱼ = fⱼ(xᵢ)
   for i in 1:length(fs)
-    plot!(pkg, plt; x = x, y = map(fs[i], x), getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = x, y = map(fs[i], x), getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
 
 function plot!(pkg::PlottingPackage, plt::Plot, y::AVec{AVec}; kw...)                 # multiple lines, each with x = 1:length(y[i])
   for i in 1:length(y)
-    plot!(pkg, plt; x = 1:length(y[i]), y = y[i], getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = 1:length(y[i]), y = y[i], getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
@@ -210,7 +224,8 @@ end
 function plot!(pkg::PlottingPackage, plt::Plot, x::AVec, y::AVec{AVec}; kw...)        # multiple lines, will assert length(x) == length(y[i])
   for i in 1:length(y)
     @assert length(x) == length(y[i])
-    plot!(pkg, plt; x = x, y = y[i], getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = x, y = y[i], getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
@@ -219,14 +234,16 @@ function plot!(pkg::PlottingPackage, plt::Plot, x::AVec{AVec}, y::AVec{AVec}; kw
   @assert length(x) == length(y)
   for i in 1:length(x)
     @assert length(x[i]) == length(y[i])
-    plot!(pkg, plt; x = x[i], y = y[i], getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot!(pkg, plt; x = x[i], y = y[i], getPlotKeywordArgs(kw, i, plt)...)
   end
   plt
 end
 
 function plot!(pkg::PlottingPackage, plt::Plot, n::Integer; kw...)                    # n lines, all empty (for updating plots)
   for i in 1:n
-    plot(pkg, plt, x = zeros(0), y = zeros(0), getPlotKeywordArgs(kw, i)...)
+    plt.n += 1
+    plot(pkg, plt, x = zeros(0), y = zeros(0), getPlotKeywordArgs(kw, i, plt)...)
   end
 end
 

src/qwt.jl

@@ -3,7 +3,7 @@
 
 immutable QwtPackage <: PlottingPackage end
 
-plot(pkg::QwtPackage; kw...) = Plot(Qwt.plot(zeros(0,0); kw...), pkg)
+plot(pkg::QwtPackage; kw...) = Plot(Qwt.plot(zeros(0,0); kw...), pkg, 0)
 
 function plot!(::QwtPackage, plt::Plot; kw...)
   Qwt.oplot(plt.o; kw...)