title: timeline chart with events
body: <p>For a rails web application I need a timeline with on the top (stacked) bar charts and on the bottom single events that should be recognizably different using e.g. forms (squares, rhombus, circles) and colors.</p>
  
  <p>It's also important that I get some kind of picture back in order to reuse it to build a pdf.</p>
  
  <p>At the moment I do the bar chart part with google charts, but I can't find a way to do the events. Those could also be on a separate chart that I then align in html or the pdf.</p>