stacked_bar.rb

require 'rubyplot'
@datasets = [
  [[20, 10, 5, 12, 11, 6, 10, 7], :Anna],
  [[5, 10, 20, 6, 9, 12, 14, 8], :Jack],
  [[19, 9, 6, 11, 12, 7, 15, 8], :Katie]
]
plot = Rubyplot::StackedBar.new(1000)
plot.title = 'Net earnings in different months'
plot.labels = {
  0 => 'Jan',
  1 => 'Feb',
  2 => 'March',
  3 => 'April',
  4 => 'May',
  5 => 'June',
  6 => 'July',
  7 => 'August',
  8 => 'September',
  9 => 'October',
  10 => 'November',
  11 => 'December'
}

@datasets.each do |data|
  plot.data data[0], label: data[1]
end
plot.write('stacked_bar_test_1.png')