[BGL] write_graphviz error

From: Micha Bieber (yg-boost-users_at_[hidden])
Date: 2003-08-15 01:28:11

The following bug exists also as sourceforge bug request:

[ 778394 ] GraphViz Interface

boost version is 1.30.0

Because Jeremy seems to be reactivated and the sourceforge tracker status is still 'open' 
a small reminder:

For an adjacency list of the following form

adjacency_list<listS, listS, undirectedS, PositionProperty>

write_graphviz produces the following graph structure

--- output begin ---

graph G {
graph [splines=false bgcolor=lightgrey]
node [shape=circle color=red]
edge [style=solid]
002F48A0[label ="", height="0.1", pos="540,250"];
002F4978[label ="", height="0.1", pos="278,321"];
002F4A50[label ="", height="0.1", pos="198,67"];
002F4B28[label ="", height="0.1", pos="163,27"];
002F4C00[label ="", height="0.1", pos="442,487"];
002F4B28--002F4A50 ;
002F4A50--002F4978 ;
002F4978--002F4B28 ;
002F4B28--002F48A0 ;
002F48A0--002F4A50 ;
002F4978--002F48A0 ;
002F48A0--002F4C00 ;
002F4C00--002F4978 ;
}

--- output end ---

This causes error messages from neato (GraphViz tool):

--- error messages begin --

v:\my\delaunay\test\d1\output>neato -s72 -n2 -Tgif -o file.gif delaunay.dot
Warning: delaunay.dot:5: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:6: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:7: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:8: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:9: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:10: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:10: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:11: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:11: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:12: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:12: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:13: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:13: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:14: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:14: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:15: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:15: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:16: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:16: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:17: ambiguous "002F" splits into two names: "002" and "F"
Warning: delaunay.dot:17: ambiguous "002F" splits into two names: "002" and "F"
Error: node 002 in graph G has no position
as required by the -n flag

v:\my\delaunay\test\d1\output>

--- error messages end ---

The reason can be found at:

http://www.research.att.com/~erg/graphviz/info/lang.html

"An ID is any string of alphabetic characters, underscores or digits, but not beginning 
with a digit; or a number; or any quoted string possibly containing escaped quotes."

So, the hexadecimal number (mix of digits and characters) of the transfered pointer (list
item) is the problem.I would suggest write_graph_viz quotes the node name or prefixes with 
a character or uses a decimal representation.

Regards,
Micha