Hello,
The code:
g = Gruff::Line.new
g.data("Data", [1]*10)
g.write('graph.png')
draws a horizontal line, but the code:
g = Gruff::Line.new
g.data("Data", [0]*10)
g.write('graph.png')
draws a "Not Data" message, and it is false, because there is data. I think that it is a bug.
--Daniel
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