Candlestick/Financial Charts in Ruby

Are there any good libraries available for plotting candlestick and other types of fin开发者_如何学Cancial charts in Ruby? I saw this similar post from over a year ago. The presented options that fit my needs from that post were Python, however.

EDIT:

One requirement is that I need real-time charts, updating multiple times a second.

The google chart API supports candlestick charts, among other things.

There are a few gems that automate this: googlecharts, gchartrb. I haven't used them but they look like a good first cut.

Here's a quick example from the docs: