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require "unicode_plot"
require "stringio"
N = 1000
M = 50
out = StringIO.new
def out.tty?; true; end
shift = 0
continue = true
Signal.trap(:INT) { continue = false }
while continue
out.truncate(0)
xs = 0...N
ys = xs.map {|x| Math.sin(2*Math::PI*(x + shift) / N) }
UnicodePlot.lineplot(xs, ys, width: 60, height: 15).render(out)
lines = out.string.lines
lines.each do |line|
$stdout.print "\r#{line}"
end
$stdout.print "\e[0J"
$stdout.flush
sleep 0.2
if continue
n = lines.count
$stdout.print "\e[#{n}F"
shift = (shift + M) % N
end
end
$stdout.print "\e[0J"
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