[OpenLayers-Dev] Layers into Groups

[Jachym Cepicky]

Hi,

Ludwig M Brinckmann píše v Út 23. 10. 2007 v 21:06 +0100:
> 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.

Some layers were active only, if you zoomed to region around Canada
(fixed). I completely agree with you, that the "design" of the page
"could" be more intuitive -- sorry, no graphical designer.

> 
> 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. 

nice demo

> 
> 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.

this is somehow more intuitive, than my previous layer-buttons.html
example. Sliders are better for opacity settings, but I did not know,
how to get them in current LayerSwitcher dimensions.

>  
> 
> 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.

Dragging is definitely more intuitive, than buttons (again
layer-buttons.html in my sandbox), when it is working. Together with
layer groups (layer-groups.html), the code would get pretty
complicated..

> 
> 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...

I'm working on it. If others like it, I hope, it would appear in
OpenLayers trunk - I'm not avare of any other impediment.

Jachym

> 
> 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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>         
>         
> 
-- 
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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