Having posted the original request I thought I had better follow up
with what I actually did...
It looked like plotkit would do what I want, and was easy to generate
data for within the main web page (so don't need 2 http round trips
and carrying state between them). However plotkit does not support
legends on graphs - and since I was generating some with lots of
lines, this was pretty much a must have.
I found that WebFX Chart ( http://webfx.eae.net/dhtml/chart/
chart.html ) had support for a legend. It generally works well
although a few things are a bit "lumpy" - handling of axes etc.
The implementation is a little bit of a hack, but basically I have a
graph method in each of the graphable controllers, this passes a
DBIx::Class resultset to a build_graph method in a common superclass,
which pushes a graph structure into the stash (containing a set of
lines, each with an array of values, a min and a max value). A TT
fragment in the view converts this into a set of js calls for WebFX
Chart.
This works acceptably - it has a few performance issues for large
graphs, which appear to be down to the overhead in pulling out and
building into objects the several hundred rows of data - I suspect
that if I just took the values from a dbh rather than letting DBIC
create a new row object the whole thing would speed up rather
dramatically.
Nigel.
--
[ Nigel Metheringham [EMAIL PROTECTED] ]
[ - Comments in this message are my own and not ITO opinion/policy - ]
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