edge style: line caps

[Szabolcs Horvat <szhorvat AT nd.edu>]

Hello,

Is it possible to control the line cap style for edges drawn as lines?

Different standard line cap styles are shown e.g. in this figure:

http://maperitive.net/docs/images/LineCaps.png

The default for GraphStream seems to be no. 3 from the left (square caps), 
while I'm aiming for no. 1 or no. 2 (butt caps or round caps).  The dots in 
the figure indicate the line end coordinates.  The difference between butt 
caps and square caps is that the former ends at the coordinate while the 
latter is longer by an amount determined by the line width.

Controlling this would be useful when the line width is comparable to the 
size of circular nodes (example: 
https://www.evernote.com/shard/s135/sh/f2553721-7a45-4e40-af2d-b10772d9e502/840dd5a84326371b3d9b1f7461f58b02
 )

I don't expect that this control is possible, but GraphStream has surprised 
me (pleasantly) in the past, so I thought I'd ask :-)

Thank you,
Szabolcs