[eclipse-users] node(daVinci) and uDraw(Graph)

From: Tias Guns <tias.guns_at_...88...>
Date: Wed, 05 Dec 2007 17:33:35 +0100
Hello,

Apparently the daVinci graph drawing tool is renamed to uDraw(Graph)
http://www.informatik.uni-bremen.de/uDrawGraph/en/index.html

Fortunately there is no API change, so ECLiPSe can perfectly well work  
with it.
The thing I did was:
1) unpack uDrawGraph somewhere, for me: /home/tias/local/uDrawGraph-3.1
2) add DAVINCIHOME="/home/tias/local/uDrawGraph-3.1"; export DAVINCIHOME
or something similar to your .bashrc
3) go to your /home/tias/local/uDrawGraph-3.1 dir, and do: ln -s  
bin/uDrawGraph daVinci

On linux systems, this works perfectly well.


Unfortunately, the graph drawing only works for the first solution. This  
problem always occurs, independant of using uDrawGraph or the old daVinci.
Reproducing the bug:
1) download the queens example:  
http://eclipse.crosscoreop.com/examples/queens_simple.ecl.txt
2) change 'labeling(Board).' with 'search(Board, 0, input_order, indomain,  
complete, [node(daVinci)]).'
3) run queens_lists(6,B).

This is what you will get:
<<<<<<<<<
[eclipse 1]: queens_lists(6,B).
lists.eco  loaded traceable 0 bytes in 0.00 seconds
daVinci.eco loaded traceable 0 bytes in 0.01 seconds

B = [2, 4, 6, 1, 3, 5]
Yes (0.01s cpu, solution 1, maybe more) ? ;
%%% draws the first part of the search tree here
illegal stream specification in printf(daVinciAttribute, ',', [])
Abort
>>>>>>>>>

What I would have hoped to happen is that when generating the next answer,  
the graph would get a new branch in the nodes at which the backtracking  
happens.

The error happens on line 385 of daVinci.ecl:
da_comma(Stream):-
     printf(Stream,',',[]).


I have tried to fix this, but I do not find a way.
Is it possible to make this graph drawing work over multiple solutions ?  
It is only usefull to me if this would work.


Many thanks in advance,
Tias
Received on Wed Dec 05 2007 - 16:34:17 CET

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