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<DIV dir=ltr align=left><SPAN class=073222013-18032009><FONT face=Arial
color=#0000ff size=2>If your just pointing directly to a large kml file
then you are right,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=073222013-18032009><FONT face=Arial
color=#0000ff size=2>but most systems have a handler that generates kml based on
parameters.</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> users-bounces@openlayers.org
[mailto:users-bounces@openlayers.org] <B>On Behalf Of </B>Tiemens,
Gerben<BR><B>Sent:</B> Wednesday, March 18, 2009 5:15 AM<BR><B>To:</B> Ivan
Grcic<BR><B>Cc:</B> users@openlayers.org<BR><B>Subject:</B> Re:
[OpenLayers-Users] Strategy cluster and slow map behavior.<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009>Thanks for your answer.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009>I already searched in the way of WFS, but wanted it
first to work with a simple KML. As searching in the mailinglist and other
resources didn't give a solution, I will have to move to a WFS
solution.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009>BBOX strategy will not work on KML so that is nog the
right way to go.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009>Maybe there might be an idea to leave out the
clusterfeatures that are out of view when using strategy cluster? Some sort of
BBOX idea within the clustering, but then for not attaching all the available
features in a KML to the layer, when features are out of view.(out of
viewport bbox). </SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009>Greets</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=016100909-18032009><BR>Gerben</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV><BR>
<DIV class=OutlookMessageHeader lang=nl dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>Van:</B> Ivan Grcic [mailto:igrcic@gmail.com]
<BR><B>Verzonden:</B> Tuesday, March 17, 2009 5:07 PM<BR><B>Aan:</B> Tiemens,
Gerben<BR><B>CC:</B> users@openlayers.org<BR><B>Onderwerp:</B> Re:
[OpenLayers-Users] Strategy cluster and slow map behavior.<BR></FONT><BR></DIV>
<DIV></DIV>Hi Tiemens,<BR><BR>the problem is that the more you zoom in, more and
more clusters are created. So at the first several levels, you only have several
clusters, thats why it takes relativly small amount of time. The more you zoom
in, it takes lots of time to calculate clusters.<BR><BR>This is happening
because you are working with all the features all the time, regardless of the
bbox of the map (not good solution if you have more then 50-100
features)<BR><BR>I suggest: using BBOX strategy that filters out the features
depending on map extents, together with wfs protocol. Then it should work pretty
fast.<BR><BR>HINT: check ratio parametar and <A
href="http://trac.openlayers.org/ticket/1830">http://trac.openlayers.org/ticket/1830</A><BR><BR>Cheers<BR><BR><BR>
<DIV class=gmail_quote>2009/3/17 Tiemens, Gerben <SPAN dir=ltr><<A
href="mailto:Gerben.Tiemens@grontmij.nl">Gerben.Tiemens@grontmij.nl</A>></SPAN><BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff
size=2></FONT> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>Hello OpenLayers List
users,</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>I'm implementing the cluster
strategy and im facing a problem. I have a 500 features on the map from a
KML file, with google layer as baselayer. </FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>With clustering on the KML
layer, the map acts really slow. When zooming in, the map acts slower and
slower. Every zoom step, the next zoomstep will be slower.</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>When clustering is off, the
map acts fast again, even it has more features on it.</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>I turned of the special
styling, but even that does not help in this case. The map keeps acting slow
with each zoom action.</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>My site is: <A
href="http://www.getiem.nl/mineralmap/mineralmap.html"
target=_blank>http://www.getiem.nl/mineralmap/mineralmap.html</A></FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>The javascript is on <A
href="http://www.getiem.nl/mineralmap/strahlen.js"
target=_blank>http://www.getiem.nl/mineralmap/strahlen.js</A></FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>Does anyone have an idea why
clustering is slowing down on the zoomed in map?</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>Is this a bug or issue to
resolve?</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>Maybe you see a flaw in my
code.</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<OL>
<LI><SPAN><FONT face=Arial color=#0000ff size=2>Steps to
reproduce: </FONT></SPAN>
<LI><SPAN><FONT face=Arial color=#0000ff size=2>Zoom in on the map.
</FONT></SPAN>
<LI><SPAN><FONT face=Arial color=#0000ff size=2>When zoomed in to lets say
the Netherlands, its slowed down to seconds, </FONT></SPAN>
<LI><SPAN><FONT face=Arial color=#0000ff size=2>when zooming further, each
step takes longer.</FONT></SPAN></LI></OL>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>My first insights are:
all features are drawn in memory (also features outside map), and thats why it
is taking longer when zoomed in: it draws all 500 features. But thats
not satisfying, since loading all features at once and then zooming in is
faster.</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>Greetings</FONT></SPAN></DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff
size=2><BR>Gerben</FONT></SPAN></DIV>
<P><FONT face="Times New Roman"></FONT> </P><BR><FONT face=Verdana
color=gray size=1><< Please read our E-mail Disclaimer at the Grontmij
Corporate website
>><BR></FONT></DIV><BR>_______________________________________________<BR>Users
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href="mailto:Users@openlayers.org">Users@openlayers.org</A><BR><A
href="http://openlayers.org/mailman/listinfo/users"
target=_blank>http://openlayers.org/mailman/listinfo/users</A><BR><BR></BLOCKQUOTE></DIV><BR><BR
clear=all><BR>-- <BR>Ivan Grcic<BR><BR><FONT face=Verdana color=gray
size=1><< Please read our E-mail Disclaimer at the Grontmij Corporate
website >><BR></FONT></BODY></HTML>