[Phpmyadmin-devel] OpenGIS and Flot

[Madhura Jayaratne]

On Fri, May 20, 2011 at 4:27 PM, Tyron Madlener <tyronx at gmail.com> wrote:

> On Fri, May 20, 2011 at 12:15 PM, Madhura Jayaratne
> <madhura.cj at gmail.com> wrote:
> >
> >
> > On Fri, May 20, 2011 at 2:43 PM, Michal Čihař <michal at cihar.com> wrote:
> >>
> >> Hi
> >>
> >> Dne Wed, 18 May 2011 18:01:15 +0530
> >> Madhura Jayaratne <madhura.cj at gmail.com> napsal(a):
> >>
> >> > I did it as a test run and it is not finalized. Unfortunately I can't
> >> > get
> >> > flot to draw polygons with inner rings and that was a dead end for me.
> >> > So
> >> > right now I'm looking into generating all the GIS visualizations with
> >> > SVG.
> >> > In particular I am trying to generate them with jQuery-SVG.
> >> >
> >> > Well, I agree that flot makes the life very easy for developers and
> the
> >> > graphs are rich in quality. However you get less control over the
> plot.
> >> > For
> >> > example with SVG, I can manipulate each elements in the plot, but in
> >> > flot
> >> > that ability is limited to few events they have exposed. I'm not sure
> >> > how
> >> > this applies in your case, you might not want to manipulate it at all.
> >>
> >> Okay, I think we should use as few graphing libraries as possible,
> >> ideally only one, but I'm not sure if it is possible. So let's summarize
> >> what every project needs and try to find viable solution.
> >
> > What it needs to visualize GIS data is a library that lets you draw
> freely.
> > On the other hand a charting library would let you enter data for a set
> of
> > series and would draw various types of charts accordingly. When trying to
> > use a charting library to visualize GIS data (for the rich functionality
> > they offer), most of the time we would have to hack the library.
> > For example POINT, MULTIPOINT and LINESTRING can be drawn with scatter
> > charts and line charts. However to draw a MULTILINESTRING with two
> > LINESTRINGs you'll have to draw 2 series giving them the same series name
> > and same color, effectively hacking the library. The problem is with
> > legends, legend would show two entries. The case gets worse when it comes
> to
> > POLYGONS and MULTIPOLYGONS, worst when these have inner rings :(
> > Thats why I had to give up flot and settle for SVG, in particular jQuery
> > SVG, which gives control over what is being drawn. However now I have to
> > manage a number of features such as zooming, panning, tooltips with my
> own
> > code.
> >>
> >> I think for charts, it would be nice to save them, but that does not
> >> seem to work with neither flot nor jQuery-SVG.
> >>
>
> Wouldn't it be possible to write a sort of flot plugin for your case?
> Maybe thats even the easier way, than to program zooming, panning,
> tooltips etc. yourself.
> Then I could also use flot for my statistics page :D
>
>
Nice idea :)
But that would most probably amount to re-writing flot altogether. The thing
is flot is not designed to draw shapes and all.
IMO handling zooming, panning and tooltips with SVG is far easier than that
:)

-- 
Thanks and Regards,

Madhura Jayaratne
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