making whole data

Author: Mohammed Sadique

lib/matplotex/figure/areal.ex

@@ -58,7 +58,6 @@ defmodule Matplotex.Figure.Areal do
       end
 
       def add_title(axes, title, opts) when is_binary(title) do
-        # title = Text.create_text(title, opts)
         %{axes | title: title, show_title: true}
       end
 
@@ -170,6 +169,17 @@ defmodule Matplotex.Figure.Areal do
           data_with_label(data)
         end
       end
+      # For stacked bar chart the flattening supposed to be the sumation of yaxis data
+      def flatten_for_data(datasets,_data, nil), do: flatten_for_data(datasets)
+      def flatten_for_data(_datasets,%{x: x, y: y} = _data, bottom) do
+      y =   bottom
+        |> Tuple.to_list()
+        |> Kernel.++(y)
+        |> Nx.tensor(names: [:x, :y])
+        |> Nx.sum(axes: [:x])
+        |> Nx.to_list()
+      {x, y}
+      end
 
       def flatten_for_data(datasets) do
         datasets

lib/matplotex/figure/areal/bar_chart.ex

@@ -36,7 +36,8 @@ defmodule Matplotex.Figure.Areal.BarChart do
     x = hypox(values)
     dataset = Dataset.cast(%Dataset{x: x, y: values, pos: pos, width: width}, opts)
     datasets = data ++ [dataset]
-    xydata = flatten_for_data(datasets)
+     bottom = Keyword.get(opts, :bottom)
+    xydata = flatten_for_data(datasets,data, bottom)
 
     %Figure{
       figure
@@ -55,7 +56,7 @@ defmodule Matplotex.Figure.Areal.BarChart do
            axes:
              %{
                dataset: datasets,
-               data: data,
+               data: {_x, y},
                limit: %{x: xlim, y: ylim},
                type: "stacked",
                region_content: %Region{