[R-sig-Geo] time diagram

[Laurence Amilhat]

Dear R users,

I had several projects with different starting and ending dates.
I would like to plot the duration of the different project along a time 
axis,
as it is shown in the following scheme:
diagram

Do you know if there is a nice R function to do such diagram.
I'am sorry if this is a redundant question, I tried to find some 
informations over the internet but as I don't know the name for such 
diagram, informations are hard to find.

Thank you for your help,


Regards,



Laurence Amilhat.