Module: Charts::Legend

Included in:
BarChart, PieChart
Defined in:
lib/charts/legend.rb

Instance Method Summary collapse

Instance Method Details

#draw_labels ⇒ Object 



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# File 'lib/charts/legend.rb', line 2

def draw_labels
  return if options[:labels].nil? || labels.empty?
  label_row_length_sum = 0
  label_row = 1
  labels.each_with_index do |label, index|
    x = outer_margin + label_row_length_sum
    y = height - outer_margin - label_total_height + label_row * (label_height + label_margin)
    label_row_length_sum += label.length * 10 + label_height + 2 * label_margin
    if label_row_length_sum > inner_width
      label_row_length_sum = 0
      label_row += 1
    end
    renderer.rect x, y, label_height, label_height, fill: colors[index], stroke: colors[index]
    label_x = x + label_height + label_margin
    label_y = y + label_height - renderer.font_size / 3
    renderer.text label, label_x, label_y, text_anchor: 'start', class: 'label'
  end
end

#label_rows ⇒ Object 



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# File 'lib/charts/legend.rb', line 26

def label_rows
  return 0 if options[:labels].nil? || labels.empty?
  avg_character_width = 10
  ((labels.join.length * avg_character_width + 2 * labels.count * label_margin) / inner_width.to_f).ceil
end

#label_total_height ⇒ Object 



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# File 'lib/charts/legend.rb', line 21

def label_total_height
  return 0 if options[:labels].nil? || labels.empty?
  label_rows * (label_height + label_margin)
end