Re: Lots of polylines to load

On Oct 5, 3:05 pm, Alexandre Dube <ad...@mapgears.com> wrote:
>
> It sure is quick, but what if I want to interact with the polylines ?

Then you might need to re-think your design.
Perhaps load them all as custom tiles, and then just the few that are
in the current view as encoded polylines, refreshing by AJAX when the
user pans and zooms the map.

I don't know what area of coverage you're interested in, but if you
think, for example, of 2000 trails spread all over the US, when the
entire country is in view, each trail might be just a dot on the
screen. (Except something big like the Lewis and Clark trail, of
course) :-)

--
Marcelo - http://maps.forum.nu
--

> When hovering them with the mouse, display a popup. When clicking on
> them, interact. Etc.
>
> So, my bet was to use GPolylines since it's easier to interact with.
> Is there more I should know to get a performance boost ?
>
> Many thanks,
>
> Alexandre
>
>
>
> Marcelo wrote:
> > With so many polylines, your best bet is to paint them on custom
> > tiles:
> >http://maps.forum.nu/bakersfield/
>
> > --
> > Marcelo -http://maps.forum.nu
> > --
>
> > On Oct 5, 2:45 pm, Alexandre Dube <ad...@mapgears.com> wrote:
>
> >> Hi,
>
> >> I'm designing an application where I have to load lots of polylines
> >> (trails). I designed a php server that returns the geometry only on the
> >> current map extent. The data is simplified per zoom level.
>
> >> From zoom level 0 to 7, no big deal (loading only 'international'
> >> trails). At level 8, I start loading 'regional' trails, which can gives
> >> 1500-2000 polylines. Theses must be destroyed when the map zoom level
> >> changes (since the geometry is simplified/zoom level). Currently, I
> >> remove/destroy each polyline one by one because I can't
> >> "clearAllOverlays" since I have other overlays I want to always keep.
>
> >> So, I'm seeking knowledge/tip/example about how to implement what I'm
> >> trying to do more quickly. Could I use a GLayer and put all the
> >> Polylines there and flush them from there ? Is there a way to
> >> "clearAllOverlays" on one kind only (polyline) ? Even more, are
> >> 1500-2000 polylines too much ?
>
> >> Many thanks,
>
> >> --
> >> Alexandre Dubé
> >> Mapgearswww.mapgears.com
>
> --
> Alexandre Dubé
> Mapgearswww.mapgears.com
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