[Phpmyadmin-devel] OpenGIS and Flot

[Madhura Jayaratne]

On Fri, May 20, 2011 at 4:47 PM, Madhura Jayaratne <madhura.cj at gmail.com>wrote:

>
>
> 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
>
>
Hi Tyron,

Btw jQuery-SVG already has an extension for graphing. Pls have a look at the
Graphing section of jQuery-SVG[1] and jQuery SVG Graphing Reference
section[2] to see whether it suffices for your needs.

-- 
Thanks and Regards,

Madhura Jayaratne

[1] http://keith-wood.name/svg.html (See the Graphing section)
[2] http://keith-wood.name/svggraphRef.html
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