Class: Gruff::Bar
Overview
Gruff::Bar provide a bar graph that presents categorical data with rectangular bars.
Here’s how to set up a Gruff::Bar.
g = Gruff::Bar.new
g.title = 'Bar Graph With Manual Colors'
g.spacing_factor = 0.1
g.group_spacing = 20
g.data :Art, [0, 5, 8, 15], '#990000'
g.data :Philosophy, [10, 3, 2, 8], '#009900'
g.data :Science, [2, 15, 8, 11], '#990099'
g.write('bar.png')
Constant Summary
Constants inherited from Base
Gruff::Base::DEFAULT_MARGIN, Gruff::Base::DEFAULT_TARGET_WIDTH, Gruff::Base::LABEL_MARGIN, Gruff::Base::LEGEND_MARGIN
Instance Attribute Summary collapse
-
#bar_spacing ⇒ Object
Spacing factor applied between bars.
-
#group_spacing ⇒ Object
Spacing factor applied between a group of bars belonging to the same label.
-
#label_formatting ⇒ Object
Set the number output format for labels using sprintf.
-
#show_labels_for_bar_values ⇒ Object
Output the values for the bars on a bar graph.
Attributes inherited from Base
#bold_title, #bottom_margin, #center_labels_over_point, #colors, #font, #font_color, #has_left_labels, #hide_legend, #hide_line_markers, #hide_line_numbers, #hide_title, #label_max_size, #label_stagger_height, #label_truncation_style, #labels, #left_margin, #legend_at_bottom, #legend_box_size, #legend_font_size, #legend_margin, #marker_color, #marker_count, #marker_font_size, #marker_shadow_color, #maximum_value, #minimum_value, #no_data_message, #right_margin, #sort, #sorted_drawing, #title, #title_font, #title_font_size, #title_margin, #top_margin, #use_data_label, #x_axis_increment, #x_axis_label, #y_axis_increment, #y_axis_label
Instance Method Summary collapse
- #draw ⇒ Object
-
#spacing_factor=(space_percent) ⇒ Object
Can be used to adjust the spaces between the bars.
Methods inherited from Base
#add_color, #data, #initialize, #margins=, #replace_colors, #theme=, #theme_37signals, #theme_greyscale, #theme_keynote, #theme_odeo, #theme_pastel, #theme_rails_keynote, #to_blob, #write
Constructor Details
This class inherits a constructor from Gruff::Base
Instance Attribute Details
#bar_spacing ⇒ Object
Spacing factor applied between bars.
23 24 25 |
# File 'lib/gruff/bar.rb', line 23 def @bar_spacing end |
#group_spacing ⇒ Object
Spacing factor applied between a group of bars belonging to the same label.
26 27 28 |
# File 'lib/gruff/bar.rb', line 26 def group_spacing @group_spacing end |
#label_formatting ⇒ Object
Set the number output format for labels using sprintf. Default is “%.2f”.
30 31 32 |
# File 'lib/gruff/bar.rb', line 30 def label_formatting @label_formatting end |
#show_labels_for_bar_values ⇒ Object
Output the values for the bars on a bar graph. Default is false
.
34 35 36 |
# File 'lib/gruff/bar.rb', line 34 def @show_labels_for_bar_values end |
Instance Method Details
#draw ⇒ Object
44 45 46 47 48 49 50 51 52 53 54 |
# File 'lib/gruff/bar.rb', line 44 def draw # Labels will be centered over the left of the bar if # there are more labels than columns. This is basically the same # as where it would be for a line graph. @center_labels_over_point = (@labels.keys.length > column_count) super return unless data_given? end |
#spacing_factor=(space_percent) ⇒ Object
Can be used to adjust the spaces between the bars. Accepts values between 0.00 and 1.00 where 0.00 means no spacing at all and 1 means that each bars’ width is nearly 0 (so each bar is a simple line with no x dimension).
Default value is 0.9
.
62 63 64 65 66 |
# File 'lib/gruff/bar.rb', line 62 def spacing_factor=(space_percent) raise ArgumentError, 'spacing_factor must be between 0.00 and 1.00' unless (space_percent >= 0) && (space_percent <= 1) @spacing_factor = (1 - space_percent) end |