[OpenLayers-Dev] Layers into Groups

[Ludwig M Brinckmann]

Hi Jachym,

for me on XP and Firefox 2.0.0.8 this appears quite unresponsive, even
though after a bit of clicking something eventually happens. I am not sure
about the graphical solution as I do not really know when a layer is
switched on or off.

A while ago I experimented a bit with a custom layer switcher outside the
map window, it still seems to be working at

http://www.yunnanexplorer.com/mars.html

There were several ideas in it:
First of all ignore the tick-boxes -- they flicker a layer on and off. This
is not very intuitive. I thought once having a special effects div hidden
with every layer that could be turned on and off. Flickering a layer, moving
a sliding window over a layer, inverting colours, image stretching could all
go in there. Never followed through.

The sliders allow to adjust transparency of a layer: red all the way to the
left is off, green is 100% opaque. The rest somewhere in the middle: good
way if you want to look at data in more than one map at a time.

Furthermore it is possible to drag the layers up and down, changing the
stacking/drawing order. I know that conflicts with the baselayer concept of
OL.

These effects were done with scriptaculous and do not really work that well
under IE, but someone with more patience/time than me could probably make
them work. It is now over a year old and I have not done any work on it, so
some of the layers have ceased to function.

I think building better/different layer switchers, particularly with
grouping, is quite important...

Ludwig






On 23/10/2007, Jachym Cepicky <jachym.cepicky at gmail.com> wrote:
>
> Hi,
>
> could anybody of you, guys, have a look at new "custom LayerSwitcher"
> example [1] ?
>
> I hope, it works on all platforms
>
> Comments are more  then welcomed
>
> Jachym
>
> P.S. You will have to probably zoom to Canada, go get all layers work
>
> [1]
>
> http://dev.openlayers.org/sandbox/jachym/openlayers/examples/layerswitcher.html
>
> Jachym Cepicky píše v Po 15. 10. 2007 v 13:20 +0200:
> > Hi developers,
> > I have implemented ordering map layers into groups [1]. You have to
> > specify new layer attribute group:"Group Name", e.g.:
> >
> >  var dm = new OpenLayers.Layer.WMS( "DM Solutions Transit",
> >                 "http://www2.dmsolutions.ca/cgi-bin/mswms_gmap",
> >                 {layers: "rail,road",
> >                  transparent: "true", format: "image/png"
> >                 },
> >                 {
> >                   group:"Transit"
> >                 });
> >
> > You can define group hierarchy using "/" mark:
> >
> > ....
> > group: "Transit/Roads"
> > ....
> >
> > Only changed file is LayerSwitcher.js
> >
> > For example see [2]
> >
> > Hope, you'll like it
> >
> > Jachym
> >
> > [1] http://trac.openlayers.org/ticket/1086
> > [2]
> >
> http://dev.openlayers.org/sandbox/jachym/openlayers/examples/layer-groups.html
> > _______________________________________________
> > Dev mailing list
> > Dev at openlayers.org
> > http://openlayers.org/mailman/listinfo/dev
> --
> Jachym Cepicky
> e-mail: jachym.cepicky at gmail.com
> URL: http://les-ejk.cz
> GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
>
>
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>
>
>
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