[mapserver-dev] ms rfc 48: adding a type keyword to the styleblock

[thomas bonfort]

Tamas,

you're very right, adding only a single keyword is much better, and my
impression is that there might be many other applications to the
concept, so that's the way to go imo. It also solves the todos left in
the rfc (buffer distance, and options for "vertices" keyword)
I'll update the rfc accordingly.

Why do you want to add the "geom" argument to the expressions ?

as for the implementation, I don't feel upto writing a parser capable
of understanding the more complex of your examples, but I guess that
could be done in a second step while keeping the same global concept.

I'll also have a look at the implications and feasibility of adding
the keyword to the layerobj.

thanks and cheers,

thomas


On Thu, Nov 6, 2008 at 11:09, Tamas Szekeres <szekerest at gmail.com> wrote:
> 2008/11/6 Steve Lime <Steve.Lime at dnr.state.mn.us>:
>> When we first thought of style types it was limited to a couple simple options
>> (begin, end, labelpnt, bbox). Of course ideas grow and operations like convex
>> hulls or buffers sound doable. That immediately brings RFC 22 into my mind
>> again. Tamas, how do you see this working with those ideas?
>>
>
> Steve,
>
> This proposal provides a subset of what RFC 22 have been addressed.
> However I like this idea because it's more lightweight, though it may
> not support geometries from multiple features/layers in the
> expressions and further options like feature caching regarding to the
> queries is quite unrelated.
>
> Getting back to this idea, we could gain further improvements by
> supporting the attribute bindings with these expressions, like for
> example:
>
>  GEOMERTYEXPRESSION  "buffer(geom, [bufferattribute])"
>
> And again, I'd support adding this both to the STYLE and the LAYER sections.
>
> This member should also be exposed to the mapscript interface and it
> would also be desirable to expose the transformation function as well
> to be able to evaluate such expressions separately,like:
>
> shapeObj shape2 = layer.TransformGeometry(geoexpression, shape)
>
> Best regards,
>
> Tamas
>