[OpenLayers-Users] SVG Overlay

[Pierre GIRAUD]

Hello,

I think this need to be more discussed.
I agrees with the fact that it would be better for some applications
to provides SVG icons into single files as externalGraphics already do
with png/gif/jpeg files.

I did some quick investigation, and it seems like there is no standard
way to load icons from a external file.
As said in the specification "Unlike 'image', the 'use' element cannot
reference entire files." but the spec allows to use external
references (<use xlink:href="some.svg#some_symbol"/>).
However, we won't be able to handle it in OpenLayers since Firefox
doesn't support external documents references. [1] [2]

Any other suggestion on a way to go ?


[1] http://www.mozilla.org/projects/svg/status.html
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=269482

On Dec 12, 2007 11:38 PM, miles <miles.togoe at gmail.com> wrote:
> Pierre GIRAUD wrote:
> > I'm just wondering if you noticed that we are using a svg symbols catalogue.
> > http://dev.openlayers.org/sandbox/camptocamp/vectorSymbols/examples/symbol_catalog.svg
> >
> ahh, okay, maybe this is what I'm trying to figure out - I can see the
> usefulness for many people of having a ready-to-use symbol library.  But
> since there's obviously code that translates SVG from the symbol
> library, couldn't there be or is there an api call that imports directly
> from a separate SVG file rather than from the symbol library - thus,
> instead of having to put a dynamically created SVG in the symbol
> library, we could just call something like map.importsvg(mysvg,
> x,y,scale,rotate) - then the SVG import file gets the advantage of being
> geo-positioned (if that is the right term) and converted to VML, if IE.
>
>
>
>
> > Regards,
> > Pierre
> >
> > On Dec 12, 2007 10:49 PM, miles <miles.togoe at gmail.com> wrote:
> >
> >> Pierre GIRAUD wrote:
> >>
> >>> If you need vector symbols you should have a look at this example.
> >>>
> >>> http://dev.openlayers.org/sandbox/camptocamp/vectorSymbols/examples/vector-symbols.html
> >>>
> >>>
> >> This seems backwards to me to have to replicate graphic or symbol
> >> libraries in yet another graphics api - if we're outputting dynamic
> >> graphics in SVG in our code, now we have to change our output code to
> >> OpenLayers vector language ?  Which then converts it back to SVG ?
> >> duh?  The advantage of using an open xml standard like SVG is that it
> >> can be displayed not just on the screen in OpenLayers but converted via
> >> ImageMagik, saved to an xml output file to be used in Inkscape (or even
> >> in a text editor), or in reverse, created in Inkscape and brought in
> >> from there, and likewise used in other programs.   I'm starting to
> >> wonder if we should or need to patch or fork a version of OpenLayers
> >> with direct handling of SVG ?
> >>
> >>
> >>
> >>
> >>> Two notes :
> >>>  - This only works for point features,
> >>>  - this converts svg symbols into vml groups so that they can be
> >>> rendered into IE.
> >>>
> >>> Regards,
> >>> Pierre
> >>>
> >>> On Dec 12, 2007 9:28 PM, miles <miles.togoe at gmail.com> wrote:
> >>>
> >>>
> >>>> Tim Schaub wrote:
> >>>>
> >>>>
> >>>>> Hey-
> >>>>>
> >>>>> miles wrote:
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Are there any examples of using a SVG overlay?  I didn't see any.  I
> >>>>>> suspect it's kind of tricky since I assume the SVG coordinate system
> >>>>>> would need to be translated to the coordinate system/projection being
> >>>>>> used for the base layer.
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>> If you open the following page in Firefox, you're looking at an "SVG
> >>>>> overlay."
> >>>>>
> >>>>> http://openlayers.org/dev/examples/rotate-features.html
> >>>>>
> >>>>> Did you mean something different?
> >>>>>
> >>>>>
> >>>>>
> >>>> yes, I realize OpenLayers renders in SVG or VML but I meant overlaying
> >>>> an actual SVG xml file.  This would permit displaying icons made in
> >>>> Inkscape, etc and I would think be faster since OpenLayers does not have
> >>>> to convert the vector language code to SVG.  Obviously it would only
> >>>> display in a browser that supports SVG - or should we say won't display
> >>>> in IE, the only browser that does not support SVG ):
> >>>>
> >>>> <?xml version="1.0" encoding="UTF-8" standalone="no"?>
> >>>> <!-- Created with Inkscape (http://www.inkscape.org/) -->
> >>>> <svg
> >>>>    xmlns:svg="http://www.w3.org/2000/svg"
> >>>>    xmlns="http://www.w3.org/2000/svg"
> >>>>    version="1.0"
> >>>>    width="744.09448"
> >>>>    height="1052.3622"
> >>>>    id="svg2">
> >>>>   <defs
> >>>>      id="defs4" />
> >>>>   <g
> >>>>      id="layer1">
> >>>>     <path
> >>>>        d="M 231.42858 336.64789 A 48.57143 47.142857 0 1 1
> >>>> 134.28572,336.64789 A 48.57143 47.142857 0 1 1  231.42858 336.64789 z"
> >>>>
> >>>> style="fill:#ff0000;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
> >>>>        id="path2160" />
> >>>>   </g>
> >>>> </svg>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> Users mailing list
> >>>> Users at openlayers.org
> >>>> http://openlayers.org/mailman/listinfo/users
> >>>>
> >>>>
> >>>>
> >>>
> >>
> >
> >
>
>