Merge pull request #31 from LagTag/circle_graphic

Circle Graphic (^GC)

lib/zebra/zpl.rb

@@ -9,6 +9,7 @@
 require 'zebra/zpl/print_mode'
 require 'zebra/zpl/font'
 require 'zebra/zpl/box'
+require 'zebra/zpl/circle'
 require 'zebra/zpl/label'
 require 'zebra/zpl/text'
 require 'zebra/zpl/barcode'

lib/zebra/zpl/circle.rb

@@ -0,0 +1,44 @@
+require "zebra/zpl/printable"
+
+module Zebra
+  module Zpl
+    class Circle
+      include Printable
+
+      class InvalidLineThickness < StandardError; end
+      class InvalidColorError < StandardError; end
+
+      attr_reader :line_thickness, :diameter, :color
+
+      def line_thickness=(thickness)
+        raise InvalidLineThickness unless thickness.nil? || thickness.to_i.to_s == thickness.to_s
+        @line_thickness = thickness
+      end
+
+      def diameter=(value)
+        @diameter= value
+      end
+
+      def color=(value)
+        raise InvalidColorError unless value&.upcase.in?(["B","W"])
+        @color = value
+      end
+
+      def to_zpl
+        check_attributes
+        "^FO#{x},#{y}^GC#{diameter},#{line_thickness},#{color}^FS"
+      end
+
+      private
+
+      def has_data?
+        false
+      end
+
+      def check_attributes
+        super
+        raise MissingAttributeError.new("the circle diameter is not given") unless diameter
+      end
+    end
+  end
+end