Added reading QuantumRange

Author: alishdipani

lib/rubyplot.rb

@@ -30,7 +30,7 @@ module Rubyplot
     :double_dot,
     :triple_dot,
   ].freeze
-  
+
   MARKER_TYPES = [
     :dot,
     :plus,
@@ -162,6 +162,12 @@ def stop_inline
       @iruby_inline = false
     end
 
+    def QuantumRange
+      # Setting Backend to Magick as Image is only implemented for Magick backend
+      @backend = Rubyplot::Backend::MagickWrapper.new
+      Rubyplot.backend.QuantumRange
+    end
+
     def set_backend b
       case b
       when :magick
@@ -172,4 +178,3 @@ def set_backend b
     end
   end
 end # module Rubyplot
-

lib/rubyplot/artist/image.rb

@@ -3,12 +3,14 @@ module Artist
     class Image
 
       attr_accessor :rows, :columns, :pixel_array
+      attr_reader :QuantumRange
 
       def initialize(columns,rows)
         @rows = rows
         @columns = columns
         @pixel_array = []
         @image = Rubyplot.backend.init_image(columns,rows)
+        @QuantumRange = Rubyplot.backend.QuantumRange
       end
 
       def imread(path)

lib/rubyplot/backend/image_backend/image_magick_wrapper.rb

@@ -27,6 +27,10 @@ def imwrite(img, file_name)
         img.write(file_name)
       end
 
+      def QuantumRange
+        Magick::QuantumRange
+      end
+
       def export_pixels(img, x, y, columns, rows, map)
         img.export_pixels(x, y, columns, rows, map)
       end

lib/rubyplot/image.rb

@@ -42,6 +42,10 @@ def columns=(ncols)
       @columns = ncols
     end
 
+    def QuantumRange
+      @image.QuantumRange
+    end
+
     def pixel_array
       @image.pixel_array
     end