added bar plot class

Author: v0dro

lib/rubyplot/artist/axes.rb

@@ -132,7 +132,9 @@ def scatter! *args, &block
       end
 
       def bar! *args, &block
-        add_plot "Bar", *args, &block
+        plot = Rubyplot::Artist::Plot::Bar.new self
+        yield(plot) if block_given?
+        @plots << plot
       end
 
       def line! *args, &block

lib/rubyplot/artist/plot.rb

@@ -1,3 +1,4 @@
 require_relative 'plot/base'
 require_relative 'plot/scatter'
 require_relative 'plot/line'
+require_relative 'plot/bar'

lib/rubyplot/artist/plot/bar.rb

@@ -0,0 +1,31 @@
+module Rubyplot
+  module Artist
+    module Plot
+      class Bar < Artist::Plot::Base
+        # Space between the columns.
+        attr_accessor :bar_spacing
+        # Number between 0 and 1.0 denoting spacing between the bars.
+        # 0.0 means no spacing at all 1.0 means that each bars' width
+        # is nearly 0 (so each bar is a simple line with no X dimension).
+        attr_reader :spacing_factor
+        def initialize(*)
+          super
+          @spacing_factor = 0.9
+        end
+
+        # Set the spacing factor for this bar plot.
+        def spacing_factor= sf
+          raise ValueError, '@spacing_factor must be between 0.00 and 1.00' unless
+            (sf >= 0) && (sf <= 1)
+          @spacing_factor = sf
+        end
+        
+        def draw
+          super
+          return unless @axes.geometry.has_data
+        end
+      end # class Bar
+    end # module Plot
+  end # module Artist
+end # module Rubyplot
+

lib/rubyplot/figure.rb

@@ -22,6 +22,8 @@ def initialize
       @backend = Rubyplot::Backend::MagickWrapper.new
       @width = DEFAULT_TARGET_WIDTH
       @height = @width * 0.75
+      @x = 0
+      @y = 0
       add_subplots @nrows, @ncols
     end
 

spec/axes_spec.rb

@@ -449,7 +449,7 @@
         #        FileUtils.rm_rf SPEC_ROOT + "temp/bar"
       end
 
-      it "adds a simple bar plot" do
+      it "adds a simple bar plot", focus: true do
         fig = Rubyplot::Figure.new
         axes = fig.add_subplot 0,0
         axes.bar!(600) do |p| 
@@ -524,7 +524,6 @@
       end
 
        skip "adds multiple bar plots for wide graph" do
-
         fig = Rubyplot::Figure.new
         axes = fig.add_subplot 0,0
         data.each do |name, nums|