alignment

lib/labelmaker_web/constants.ex

@@ -2,7 +2,7 @@ defmodule LabelmakerWeb.Constants do
   @defaults %{
     color: "black",
     font: "Helvetica",
-    gravity: "Center",
+    align: "center",
     height: "",
     label: "",
     label_too_long: false,
@@ -23,6 +23,12 @@ defmodule LabelmakerWeb.Constants do
                   |> Map.keys()
                   |> Enum.map(&Atom.to_string/1)
 
+  @alignments [
+    "west",
+    "center",
+    "east"
+  ]
+
   @colors [
     "black",
     "blue",
@@ -85,6 +91,7 @@ defmodule LabelmakerWeb.Constants do
   def max_label_length, do: @max_label_length
   def max_label_error, do: @max_label_error
   def outlines, do: ["none" | @colors]
+  def permitted_alignments, do: @alignments
   def permitted_keys, do: @permitted_keys
   def preview, do: @preview
   def sizes, do: @sizes

lib/labelmaker_web/controllers/label_controller.ex

@@ -51,11 +51,11 @@ defmodule LabelmakerWeb.LabelController do
       ]
   end
 
-  defp size_settings(args, %{gravity: gravity, height: height, width: width} = options) do
+  defp size_settings(args, %{align: align, height: height, width: width} = options) do
     args ++
       [
         "-gravity",
-        gravity,
+        align,
         "-size",
         "#{width}x#{height}",
         "caption:#{String.slice(options.label, 0, Constants.max_label_length())}"

lib/labelmaker_web/tools.ex

@@ -20,6 +20,9 @@ defmodule LabelmakerWeb.Tools do
       |> Map.take(Constants.permitted_keys())
       |> Map.new(fn {k, v} -> {String.to_atom(k), v} end)
       |> Enum.map(fn
+        {:align, align} ->
+          {:align, process_alignment(align |> String.downcase())}
+
         {:font, font} ->
           {:font, Constants.font_map()[String.downcase(font)]}
 
@@ -48,6 +51,7 @@ defmodule LabelmakerWeb.Tools do
           pair
       end)
       |> Enum.filter(fn
+        {:align, align} -> align in Constants.permitted_alignments()
         {:color, color} -> color in Constants.colors()
         {:font, font} -> font in Map.values(Constants.font_map())
         {:outline, outline} -> outline in Constants.outlines()
@@ -59,6 +63,11 @@ defmodule LabelmakerWeb.Tools do
     Map.merge(Constants.defaults(), parameters)
   end
 
+  defp process_alignment("left"), do: "west"
+  defp process_alignment("middle"), do: "center"
+  defp process_alignment("right"), do: "east"
+  defp process_alignment(alignment), do: alignment |> String.downcase()
+
   defp process_height("", parameters) do
     parameters["width"] |> String.to_integer() |> max(0) |> min(Constants.max_height())
   end