minimal working gnuplot

src/backends/gaston.jl

@@ -1,40 +1,67 @@
 # https://github.com/mbaz/Gaston.
 const G = Gaston
-
+const GastonSubplot = G.Plot
+# --------------------------------------------
+# These functions are called by Plots
+# --------------------------------------------
 # Create the window/figure for this backend.
 function _create_backend_figure(plt::Plot{GastonBackend})
-    plt.o = G.newfigure(G.gnuplot_state.current)
+    state_handle = G.nexthandle() # for now all the figures will be kept
+    plt.o = G.newfigure(state_handle)
 end
 
-# # this is called early in the pipeline, use it to make the plot current or something
-# function _prepare_plot_object(plt::Plot{GastonBackend})
-# end
-
-# Set up the subplot within the backend object.
-function gaston_init_subplot(plt::Plot{GastonBackend}, sp::Subplot{GastonBackend})
-    sp.o = plt.o.subplots[1]
-    empty!(sp.o.curves)
-
-end
 
 function _before_layout_calcs(plt::Plot{GastonBackend})
+    # Initialize all the subplots first
+    plt.o.subplots = G.SubPlot[]
+
+    grid = size(plt.layout)
+    plt.o.layout = grid
+
     for sp in plt.subplots
         gaston_init_subplot(plt, sp)
     end
 
-    # add the series
+    # Then add the series (curves in gaston)
     for series in plt.series_list
         gaston_add_series(plt, series)
     end
 end
 
-function gaston_add_series(plt::Plot{GastonBackend}, series::Series)
-    st = series[:seriestype]
-    sp = series[:subplot]
-    g_sp = sp.o
+function _update_min_padding!(sp::Subplot{GastonBackend})
+    sp.minpad = (20mm, 5mm, 2mm, 10mm)
+end
 
-    gnuplot_args = gaston_parse_series_args(series)
-    c = G.Curve(series[:x], series[:y], nothing, nothing, gnuplot_args)
+function _update_plot_object(plt::Plot{GastonBackend})
+end
+
+function _show(io::IO, ::MIME"image/png", plt::Plot{GastonBackend})
+end
+
+function _display(plt::Plot{GastonBackend})
+    display(plt.o)
+end
+
+# --------------------------------------------
+# These functions are called gaston specific
+# --------------------------------------------
+
+function gaston_init_subplot(plt::Plot{GastonBackend}, sp::Subplot{GastonBackend})
+    dims = RecipesPipeline.is3d(sp) ? 3 : 2
+
+    axesconf = gaston_parse_axes_args(plt, sp)  # Gnuplot string
+    sp.o = GastonSubplot(dims=dims, axesconf = axesconf, curves = [])
+    push!(plt.o.subplots,  sp.o)
+
+end
+
+function gaston_add_series(plt::Plot{GastonBackend}, series::Series)
+    # Gaston.Curve = Plots.Series
+    sp = series[:subplot]
+    g_sp = sp.o  # Gaston subplot object
+
+    seriesconf = gaston_parse_series_args(series)  # Gnuplot string
+    c = G.Curve(series[:x], series[:y], nothing, nothing, seriesconf )
 
     isfirst = length(g_sp.curves) == 0 ? true : false
     push!(g_sp.curves, c)
@@ -50,7 +77,7 @@ function gaston_parse_series_args(series::Series)
     elseif st == :steppre
         push!(curveconf, """with steps""")
     elseif st == :steppost
-        push!(curveconf, """with fsteps""")  # Not sure if not 'steps'
+        push!(curveconf, """with fsteps""")  # Not sure if not the other way
     end
 
     # line color
@@ -62,18 +89,32 @@ function gaston_parse_series_args(series::Series)
     return join(curveconf, " ")
 end
 
-# Set the (left, top, right, bottom) minimum padding around the plot area
-# to fit ticks, tick labels, guides, colorbars, etc.
-function _update_min_padding!(sp::Subplot{GastonBackend})
-    sp.minpad = (20mm, 5mm, 2mm, 10mm)
+function gaston_parse_axes_args(plt::Plot{GastonBackend}, sp::Subplot{GastonBackend})
+    axesconf = String[]
+    # Standard 2d axis
+    if !ispolar(sp) && !RecipesPipeline.is3d(sp)
+        # TODO
+        # configure grid, axis spines, thickness
     end
 
-function _update_plot_object(plt::Plot{GastonBackend})
-end
+    for letter in (:x, :y, :z)
+        axis_attr = sp.attr[Symbol(letter, :axis)]
+        # label names
+        push!(axesconf, """set $(letter)label "$(axis_attr[:guide])"  """)
+        push!(axesconf, """set $(letter)label font "$(axis_attr[:guidefontfamily]), $(axis_attr[:guidefontsize])"  """)
 
-function _show(io::IO, ::MIME"image/png", plt::Plot{GastonBackend})
-end
+        # tick font
+        push!(axesconf, """set $(letter)tics font "$(axis_attr[:tickfontfamily]), $(axis_attr[:tickfontsize])"  """)
 
-function _display(plt::Plot{GastonBackend})
-    display(plt.o)
+        push!(axesconf, """set $(letter)tics textcolor rgb "#$(hex(axis_attr[:tickfontcolor], :rrggbb))" """)
+
+        push!(axesconf, """set $(letter)tics  $(axis_attr[:tick_direction])""")
+
+        mirror = axis_attr[:mirror] ? "nomirror" : "mirror"
+        push!(axesconf, """set $(letter)tics  $(mirror) """)
+
+        # set xtics (1,2,5,10,20,50)
+        # TODO logscale, explicit tick location, range,
+    end
+    return join(axesconf, "\n")
 end