[Phpmyadmin-devel] OpenGIS and Flot

[Tyron Madlener]

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

>
> It certainly is nice to let the user save the charts/visualizations. I found
> [1] when looking for a solution. But I am yet to try that out.
> --
> Thanks and Regards,
> Madhura Jayaratne
>
> [1] http://stackoverflow.com/questions/2483919/how-to-save-svg-canvas-to-local-filesystem
>
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