class Gruff::StackedBar

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

g = Gruff::StackedBar.new
g.title = 'StackedBar Graph'
g.data :Art, [0, 5, 8, 15]
g.data :Philosophy, [10, 3, 2, 8]
g.data :Science, [2, 15, 8, 11]
g.write('stacked_bar.png')