add hide_labels to stacked side bar graphs (#452)

lib/gruff/side_stacked_bar.rb

@@ -40,12 +40,16 @@ class Gruff::SideStackedBar < Gruff::SideBar
   # Default is +false+.
   attr_writer :show_labels_for_bar_values
 
+  # Prevent drawing of column labels left of a side stacked bar graph.  Default is +false+.
+  attr_writer :hide_labels
+
   def initialize_ivars
     super
     @bar_spacing = 0.9
     @segment_spacing = 2.0
     @label_formatting = nil
     @show_labels_for_bar_values = false
+    @hide_labels = false
   end
   private :initialize_ivars
 
@@ -55,6 +59,20 @@ def draw
     super
   end
 
+protected
+
+  def hide_labels?
+    @hide_labels
+  end
+
+  def hide_left_label_area?
+    hide_labels?
+  end
+
+  def hide_bottom_label_area?
+    @hide_line_markers
+  end
+
 private
 
   def draw_bars

test/test_sidestacked_bar.rb

@@ -12,85 +12,91 @@ def setup
       #[:Philip, [90, 34, 23, 12, 78, 89, 98, 88]],
       #["Arthur", [5, 10, 13, 11, 6, 16, 22, 32]],
     ]
-    @sample_labels = {
+    @labels = {
       0 => '5/6',
       1 => '5/15',
-      2 => '5/24'
+      2 => '5/24',
+      3 => '5/30'
+    }
+    @long_labels = {
+      0 => 'September',
+      1 => 'Oct',
+      2 => 'Nov',
+      3 => 'Dec'
     }
   end
 
   def test_bar_graph
-    g = Gruff::SideStackedBar.new
+    g = setup_basic_graph
     g.title = 'Visual Stacked Bar Graph Test'
-    g.labels = {
-      0 => '5/6',
-      1 => '5/15',
-      2 => '5/24',
-      3 => '5/30'
-    }
-    @datasets.each do |data|
-      g.data(data[0], data[1])
-    end
     g.write('test/output/side_stacked_bar_keynote.png')
     assert_same_image('test/expected/side_stacked_bar_keynote.png', 'test/output/side_stacked_bar_keynote.png')
   end
 
   def test_bar_graph_small
-    g = Gruff::SideStackedBar.new(400)
+    g = setup_basic_graph(400)
     g.title = 'Visual Stacked Bar Graph Test'
-    g.labels = {
-      0 => '5/6',
-      1 => '5/15',
-      2 => '5/24',
-      3 => '5/30'
-    }
-    @datasets.each do |data|
-      g.data(data[0], data[1])
-    end
     g.write('test/output/side_stacked_bar_keynote_small.png')
     assert_same_image('test/expected/side_stacked_bar_keynote_small.png', 'test/output/side_stacked_bar_keynote_small.png')
   end
 
   def test_wide
+    @labels = {
+      0 => '5/6',
+      1 => '5/15',
+      2 => '5/24'
+    }
     g = setup_basic_graph('800x400')
     g.title = 'Wide SSBar'
     g.write('test/output/side_stacked_bar_wide.png')
     assert_same_image('test/expected/side_stacked_bar_wide.png', 'test/output/side_stacked_bar_wide.png')
   end
 
   def test_should_space_long_left_labels_appropriately
-    g = Gruff::SideStackedBar.new
+    @labels = @long_labels
+    g = setup_basic_graph
     g.title = 'Stacked Bar Long Label'
-    g.labels = {
-      0 => 'September',
-      1 => 'Oct',
-      2 => 'Nov',
-      3 => 'Dec'
-    }
-    @datasets.each do |data|
-      g.data(data[0], data[1])
-    end
     g.write('test/output/side_stacked_bar_long_label.png')
     assert_same_image('test/expected/side_stacked_bar_long_label.png', 'test/output/side_stacked_bar_long_label.png')
   end
 
   def test_bar_labels
-    g = Gruff::SideStackedBar.new
+    @labels = @long_labels
+    g = setup_basic_graph
     g.title = 'Stacked Bar Long Label'
-    g.labels = {
-      0 => 'September',
-      1 => 'Oct',
-      2 => 'Nov',
-      3 => 'Dec'
-    }
-    @datasets.each do |data|
-      g.data(data[0], data[1])
-    end
     g.show_labels_for_bar_values = true
     g.write('test/output/side_stacked_bar_labels.png')
     assert_same_image('test/expected/side_stacked_bar_labels.png', 'test/output/side_stacked_bar_labels.png')
   end
 
+  def test_no_labels
+    @labels = @long_labels
+    g = setup_basic_graph(400)
+    g.title = 'No Labels'
+    g.hide_labels = true
+    g.write('test/output/side_stacked_bar_no_labels.png')
+    assert_same_image('test/expected/side_stacked_bar_no_labels.png', 'test/output/side_stacked_bar_no_labels.png')
+  end
+
+  def test_no_line_markers_or_labels
+    @labels = @long_labels
+    g = setup_basic_graph(400)
+    g.title = 'No Line Markers or Labels'
+    g.hide_labels = true
+    g.hide_line_markers = true
+    g.write('test/output/side_stacked_bar_no_line_markers_or_labels.png')
+    assert_same_image('test/expected/side_stacked_bar_no_line_markers_or_labels.png', 'test/output/side_stacked_bar_no_line_markers_or_labels.png')
+  end
+
+  def test_no_line_markers
+    @labels = @long_labels
+    g = setup_basic_graph(400)
+    g.title = 'No Line Markers'
+    g.hide_line_markers = true
+    g.write('test/output/side_stacked_bar_no_line_markers.png')
+    assert_same_image('test/expected/side_stacked_bar_no_line_markers.png', 'test/output/side_stacked_bar_no_line_markers.png')
+  end
+
   def test_draw_twice
     g = setup_basic_graph
     g.show_labels_for_bar_values = true
@@ -105,7 +111,7 @@ def test_draw_twice
   def setup_basic_graph(size = 800)
     g = Gruff::SideStackedBar.new(size)
     g.title = 'My Graph Title'
-    g.labels = @sample_labels
+    g.labels = @labels
     @datasets.each do |data|
       g.data(data[0], data[1])
     end