Class: Gruff::AccumulatorBar

Inherits:
StackedBar show all
Defined in:
lib/gruff/accumulator_bar.rb

Overview

Gruff::AccumulatorBar is a special bar graph that shows a single dataset as a set of stacked bars. The bottom bar shows the running total and the top bar shows the new value being added to the array.

Here’s how to set up a Gruff::AccumulatorBar.

g = Gruff::AccumulatorBar.new
g.title = 'Your Savings'
g.data 'First', [1, 1, 1]
g.write('accumulator_bar.png')

Constant Summary

Constants inherited from Base

Base::DEFAULT_MARGIN, Base::DEFAULT_TARGET_WIDTH, Base::LABEL_MARGIN, Base::LEGEND_MARGIN

Instance Attribute Summary

Attributes inherited from StackedBar

#bar_spacing, #hide_labels, #label_formatting, #segment_spacing, #show_labels_for_bar_values

Attributes inherited from Base

#bold_title, #bottom_margin, #center_labels_over_point, #colors, #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_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

Methods inherited from Base

#add_color, #data, #font=, #initialize, #margins=, #replace_colors, #theme=, #theme_37signals, #theme_greyscale, #theme_keynote, #theme_odeo, #theme_pastel, #theme_rails_keynote, #to_blob, #to_image, #write

Constructor Details

This class inherits a constructor from Gruff::Base

Instance Method Details

#draw ⇒ Object

Raises:



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# File 'lib/gruff/accumulator_bar.rb', line 17

def draw
  raise(Gruff::IncorrectNumberOfDatasetsException) unless store.length == 1

  accum_array = store.data.first.points[0..-2].reduce([0]) { |a, v| a << a.last + v }
  data 'Accumulator', accum_array
  set_colors
  store.reverse!
  super
end