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[cellml-dev] SVG for PCEnv graphs


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  • From: alan.garny at dpag.ox.ac.uk (Alan Garny)
  • Subject: [cellml-dev] SVG for PCEnv graphs
  • Date: Wed, 28 May 2008 13:21:19 +0100
Hi Randall,

Since you are mentioning the narrow spike issue, I believe it still hasn't
been fixed: https://tracker.physiomeproject.org/show_bug.cgi?id=23

Alan

> -----Original Message-----
> From: cellml-tools-developers-bounces at cellml.org [mailto:cellml-tools-
> developers-bounces at cellml.org] On Behalf Of Randall Britten
> Sent: 28 May 2008 12:21
> To: cellml-tools-developers at cellml.org
> Subject: Re: [cellml-dev] SVG for PCEnv graphs
>
> Hi Andrew
>
> The re-inventing of the wheel that I refer to is the issues with
> clipping
> that caused narrow spikes to be missed (fixed now), and are probably
> the
> cause of the failure to plot constants bug.
>
> I hear what you say regarding performance though, and that is a fair
> enough
> reason.
>
> Regards,
> Randall
>
> > -----Original Message-----
> > From: cellml-tools-developers-bounces at cellml.org [mailto:cellml-
> tools-
> > developers-bounces at cellml.org] On Behalf Of Andrew Miller
> > Sent: Wednesday, 28 May 2008 9:56 a.m.
> > To: A list for the developers of CellML tools
> > Subject: Re: [cellml-dev] SVG for PCEnv graphs
> >
> > Randall Britten wrote:
> > >
> > > Hi
> > >
> > > Just an idea: perhaps we could change the way we create graphs,
> such
> > > that we create SVG, and then let the Mozilla SVG rendering do the
> > rest.
> > >
> > > That way we don't have to "reinvent the wheel", plus there are
> > > benefits, such as the ability to save the graphs.
> > >
> > > (My guess is that this approach has probably already been
> considered,
> > > so I won't be surprised if the reply is a reference to some
> previous
> > > archive.)
> > >
> > Hi Randall,
> >
> > This was discussed at length around February and March 2006 when we
> > were
> > deciding on this sort of thing originally. See for example
> > http://www.cellml.org/meeting_minutes/meeting-minutes-for-
> > 2006/23.3.2006/
> > (unfortunately, we don't seem to have minutes from the 16th March
> 2006).
> >
> > The problem with using SVG is that we need to create an in-memory DOM
> > representation of ever single point on the graph - we couldn't get
> good
> > space or time performance from this, and canvas is much more
> efficient
> > for this.
> >
> > Quite aside from re-inventing the wheel, the canvas API is also a
> much
> > more natural API for writing a graph drawing program - we would
> > actually
> > be doing more wheel reinventing if we were to use SVG (unless we
> could
> > find an existing library with good enough performance, which is
> > unlikely
> > given that data points currently don't go through Javascript at all -
> > the Javascript just tells the DataCollector, which is C++ code, what
> > data to plot and where).
> >
> > Best regards,
> > Andrew
> >
> > > Regards,
> > >
> > > Randall
> > >
> > > -------------------------------------------------------------------
> --
> > ---
> > >
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> > >
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