[OpenLayers-Dev] Developement of an external vector symbol
cameron.shorter at gmail.com
Sun Oct 21 06:44:22 EDT 2007
This sounds like a great initiative and I'd be surprised if there isn't
already a number of projects which transform between SVG and VML.
I know that there has been work converting GML to SVG, and hence there
shouldn't be much work transforming GeoRSS to SVG.
So I suggest:
1. Before you do any development, research available tools that you can use.
2. Create one vector library (either SVG or VML) and use a translation
tool to automatically convert from one to the other.
3. Precompile the alternative library. Ie, don't convert SVG to VML on
3. I suspect that SVG would be a better format to support than VML. I
believe SVG is used by a number of other projects, eg the Linux Icon
4. Search for existing icon libraries and consider extending the
existing icon libraries rather than creating a new project. Maybe make a
geographic version of the library.
5. Think bigger than just OpenLayers. You start the free icon library
used by all Open Source GIS projects. It might be a candidate project
(Although you may want to seed your project within Openlayers)
Barbara Philippot wrote:
> Ian Mayo a écrit :
>> I'm afraid I can't offer an opinion on your languages challenge. It
>> would be great if there was a pre-existing file-format for vector
>> symbols, then we just specify filenames rather than hard-code the
>> vectored shapes.
> Yes, this is why we are trying to do. But people would have to specify
> two filenames (one in SVG, the other in VML) to replace the pre-existing
> symbol catalogue files and it's not still the ideal solution but perhaps
> it's the only one.
>> I'm currenlty working on provision of per-entry icons (images) for
>> georss feeds. . I've made good progress, but may have to pause my
>> efforts for the next 7 days, see my demo at: . Had you considered
>> using the symbols on a per-entry fashion in a georss feed? I suspect
>> it's fortunate I've got a self-induced development pause: it would
>> seem to be worth offering per-entry symbols as well as icons.
>> Appreciate your thoughts/opinions.
> Well, I hadn't considered using symbols in a georss feed and I don't
> know well Georss format. For the moment, symbols are associated with
> points geometry with a style.use="symbol" in the same way as images were
> associated with style.externalGraphic. So, I haven't looked in detail to
> the way you attach icons to GeoRss nodes but it seems that you would be
> able to use SVG and VML symbols as well as images.
> I hope to make progress before your development pause ends :-)
>> 1. http://trac.openlayers.org/ticket/1073
>> 2. http://dev.openlayers.org/sandbox/ianmayo/branches/rss/openlayers/examples/georss.html
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