class Charts::Chart
Attributes
data[R]
options[R]
prepared_data[R]
renderer[R]
Public Class Methods
new(data, opts = {})
click to toggle source
# File lib/charts/chart.rb, line 7 def initialize(data, opts = {}) validate_arguments(data, opts) @data = data @options = default_options.merge opts create_options_methods initialize_instance_variables @prepared_data = prepare_data end
Public Instance Methods
create_options_methods()
click to toggle source
# File lib/charts/chart.rb, line 97 def create_options_methods options.each do |key, value| define_singleton_method key, proc { value } end end
default_options()
click to toggle source
# File lib/charts/chart.rb, line 38 def default_options { title: nil, type: :svg, outer_margin: 30, background_color: 'white', labels: [], colors: [ '#e41a1d', '#377eb9', '#4daf4b', '#984ea4', '#ff7f01', '#ffff34', '#a65629', '#f781c0', '#888888' ] } end
draw()
click to toggle source
# File lib/charts/chart.rb, line 75 def draw raise NotImplementedError end
draw_background()
click to toggle source
# File lib/charts/chart.rb, line 83 def draw_background renderer.rect 0, 0, width, height, fill: background_color, class: 'background_color' end
draw_title()
click to toggle source
# File lib/charts/chart.rb, line 87 def draw_title return unless options[:title] x = width / 2 y = outer_margin / 2 + 2 * renderer.font_size / 5 renderer.text options[:title], x, y, text_anchor: 'middle', class: 'title' end
initialize_instance_variables()
click to toggle source
# File lib/charts/chart.rb, line 94 def initialize_instance_variables end
post_draw()
click to toggle source
# File lib/charts/chart.rb, line 79 def post_draw renderer.post_draw end
pre_draw()
click to toggle source
# File lib/charts/chart.rb, line 69 def pre_draw @renderer = Charts::Renderer.new(self) draw_background draw_title end
prepare_data()
click to toggle source
# File lib/charts/chart.rb, line 59 def prepare_data data end
render()
click to toggle source
# File lib/charts/chart.rb, line 63 def render pre_draw draw post_draw end
validate_arguments(data, options)
click to toggle source
# File lib/charts/chart.rb, line 16 def validate_arguments(data, options) raise ArgumentError.new('Data missing') if data.empty? raise ArgumentError.new('Data not an array') unless data.is_a? Array raise ArgumentError.new('Options missing') unless options.is_a? Hash if options[:outer_margin] and !options[:outer_margin].is_a?(Numeric) raise ArgumentError.new('outer_margin not a number') end validate_array_and_count(data, options, :colors) validate_array_and_count(data, options, :labels) end
validate_array_and_count(data, options, key)
click to toggle source
# File lib/charts/chart.rb, line 27 def validate_array_and_count(data, options, key) if options[key] unless options[key].is_a? Array raise ArgumentError.new("#{ key } not an array") end if options[key].any? and data.count > options[key].count raise ArgumentError.new("not enough #{ key }") end end end