Anyone Produced A Gnatt Chart

[MarkWildey]

I'm looking to produce a Gnatt chart which I guess will come out as a Stacked Bar Chart.

In issue #213 there was a request to control the colors of each bar, which still seems to be open. For a Gnatt chart, I would like to set one or more of the stacked bars to clear/no color to simulate a timeline for various events.

If anyone has any code to produce a Gantt chart I'd sure welcome some guidance.

Thanks in advance