[Phpmyadmin-devel] GIS visualization

[Madhura Jayaratne]

On Thu, Jun 2, 2011 at 7:28 PM, Tyron Madlener <tyronx at gmail.com> wrote:

> On Thu, Jun 2, 2011 at 3:29 PM, Madhura Jayaratne <madhura.cj at gmail.com>
> wrote:
> >
> >
> > On Thu, Jun 2, 2011 at 6:16 PM, Tyron Madlener <tyronx at gmail.com> wrote:
> >>
> >> On Thu, Jun 2, 2011 at 2:35 PM, Madhura Jayaratne <madhura.cj at gmail.com
> >
> >> wrote:
> >> >
> >> >
> >> > On Thu, Jun 2, 2011 at 1:32 PM, Tyron Madlener <tyronx at gmail.com>
> wrote:
> >> >>
> >> >> On Thu, Jun 2, 2011 at 4:27 AM, Madhura Jayaratne
> >> >> <madhura.cj at gmail.com>
> >> >> wrote:
> >> >> >
> >> >> >
> >> >> > On Thu, Jun 2, 2011 at 1:42 AM, Marc Delisle <marc at infomarc.info>
> >> >> > wrote:
> >> >> >>
> >> >> >> Madhura Jayaratne a écrit :
> >> >> >> (...)
> >> >> >> >      >     Hi Ammar,
> >> >> >> >      >
> >> >> >> >      >     I'm not sure what exactly your requirement is. But
> pls
> >> >> >> > have a
> >> >> >> >     look
> >> >> >> >      >     at the visualization of data at [1] by clicking on
> the
> >> >> >> > 'Visualize
> >> >> >> >      >     GIS data' link in the 'Query results operations'
> >> >> >> > section
> >> >> >> >     towards the
> >> >> >> >      >     bottom of the page. Try out zooming by double
> clicking
> >> >> >> > and
> >> >> >> >     panning
> >> >> >> >      >     by dragging. I believe you are looking for something
> >> >> >> > like
> >> >> >> >     this for
> >> >> >> >      >     your zoom search feature.
> >> >> >> >
> >> >> >> >     Madhura,
> >> >> >> >
> >> >> >> >     I have issues operating panning and zooming. Here is the
> >> >> >> > scenario:
> >> >> >> >
> >> >> >> >     1. Browse world_cities and click Visualize GIS data
> >> >> >> >     2. Click-drag: pans OK
> >> >> >> >     3. Double-click: this is a zoom out, I guess
> >> >> >> >     4. Click-drag: no panning
> >> >> >> >     5. Click "zoom out": data points are enlarging, isn't this a
> >> >> >> > zoom-in?
> >> >> >> >
> >> >> >> > Marc,
> >> >> >> >
> >> >> >> > This is a Firefox compatibility problem. Resolved and pushed to
> >> >> >> > the
> >> >> >> > repo. Demo will take some time to upgrade to the new version.
> >> >> >> > Meanwhile
> >> >> >> > if you have Chrome, you can still experience what it's suppose
> to
> >> >> >> > do.
> >> >> >>
> >> >> >> Madhura,
> >> >> >> ok, panning and zooming are fine now.
> >> >> >>
> >> >> >> Is the saving feature ready? I tried to save in PNG and got a
> bunch
> >> >> >> of
> >> >> >> binary data on-screen.
> >> >> >>
> >> >> >> Saving in PDF generates
> >> >> >> Fatal error: Call to undefined method
> >> >> >> PMA_GIS_Visualization::toFileAsPdf() in
> >> >> >>
> >> >> >>
> >> >> >> /srv/http/
> pma.cihar.com/gsoc-madhura/libraries/gis_visualization.lib.php
> >> >> >> on line 161
> >> >> >>
> >> >> >> --
> >> >> >> Marc Delisle
> >> >> >> http://infomarc.info
> >> >> >>
> >> >> > Hi Marc,
> >> >> > In my previous mail to the group, I mentioned that this feature is
> >> >> > not
> >> >> > yet
> >> >> > ready. BTW, this is a feature which is to be delivered in the
> second
> >> >> > half of
> >> >> > GSoC (after mid-term eval), according to the schedule. However I
> >> >> > started
> >> >> > working on it, since it is very much related to what I've done so
> >> >> > far. I
> >> >> > should be able to get it ready (for all 3 formats, SVG, PNG and
> PDF)
> >> >> > by
> >> >> > the
> >> >> > end of this week.
> >> >>
> >> >> Just in case I'm allowed to use Highcharts, could you make your
> >> >> conversion code generic enough so I could use it too? :)
> >> >> And just for your information, the current SVG converter of
> highcharts
> >> >> uses following post variables to a php file that calls a java tool
> >> >> (source is available btw):
> >> >>
> >> >>  * $tempName string The desired filename without extension
> >> >>  * $type string The MIME type for export.
> >> >>  * $width int The pixel width of the exported raster image. The
> height
> >> >> is calculated.
> >> >>  * $svg string The SVG source code to convert.
> >> >>
> >> > Hi Tyron,
> >> > For my work I am not doing any conversions as such. I am generating
> SVGs
> >> > and
> >> > PNG separately in their basic forms. It's not that I generate it in
> one
> >> > form
> >> > and converting it to the other.
> >> > --
> >>
> >> Does that mean you use jQuery SVG to generate the SVG and build/use
> >> another rendering library that generates the PNG/PDF? Why not just
> >> build a converter? That seems like a more reusable solution.
> >>
> > I use GD extension to generate PNGs and will be using TCPDF (which is
> > already included in PMA) to generate PDFs. Since both GD and TCPDF
> support
> > rendering basic shapes, I find this approach needs only
> few additional lines
> > of code, which would not have been the case if I am to build a converter.
>
> In total I did not have to add more that 100 LOC to get all 7 geometric
types to PNG.


> A disadvantage is that you will have duplicate code. Also if we would
> have a converter we could include some cool features such as exporting
> the SVG with its currently selected zoom level and pan - which might
> turn out really useful for big amounts of data.
>

Well, I agree that this will be useful.
About code duplication, I tried my best with a good class hierarchy to
ensure that code duplication is minimized as much as possible.


> And it will turn out really useful when I'm allowed use Highcharts for
> the status page. There the conversion code will be ~100% reusable.
>
> So how about we build one together? :)
>

Great idea!!! But I doubt whether I will have enough time for this, since my
GSoC project is 'OpenGIS support for PMA' and not 'OpenGIS visualization
support for PMA' :) There is lot more I promised to deliver that is related
to OpenGIS.

There should be some lib for it anyway. Might even turn out to be
> easier than the code to generate a PNG.
>
>
-- 
Thanks and Regards,

Madhura Jayaratne
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