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Hi All
We are currently working on implementing Bezier Curves in our product
antology when actors are linked for more than one type of relation, as this
is an elegant solution to avoid straight lines overlaying one another. When
a point is used to represent a node rather than a block, there is a very
small area to bind edges to the node, and hence straight lines will always
draw over the top of one another, effectively 'hiding' the fact that
multiple relations exist. We have thought about using composite line styles,
call outs etc in these circumstances, but Bezier Curves give by far the best
result.
If anyone has taken any other approaches, I'd be interested to hear your
views.
However, we think that it will be quite sometime before we see automated
generation of graphs of the beauty Lombardi produced by hand from his data -
unless anyone knows any different of course!
Perry Dyball
CakeHouse Systems
T. +44 (0)207 917 1829
M. +44 (0)780 329 3630
F. +44 (0)870 052 3440
E. mailto:[log in to unmask]
A. 212 Piccadilly, London W1J 9HG
W. http://www.cakehouse.co.uk
-----Original Message-----
From: Jim W Lai [mailto:[log in to unmask]]
Sent: 18 November 2003 17:23
To: [log in to unmask]
Subject: Re: Lombardi edges
***** To join INSNA, visit http://www.sfu.ca/~insna/ *****
On Mon, 17 Nov 2003, Peter Simon wrote:
> We could have pseudo-Lombardi edges--curved in some fashion rather than
dead
> straight.
Splines have been extensively studied and used in the computer graphics
field.
That would be my recommendation for a starting point, as it were.
For instance, Google also turned up this fairly quickly.
http://www.research.att.com/areas/visualization/papers_videos/ofullindex.htm
l
"Path Router (MPG - 4.3 MB)
"Illustrates a technique for routing a smooth curve between two points while
avoiding intervening objects. The technique and its related aesthetics were
designed for drawing edges of graphs."
Jim
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