From eric.lubow at gmail.com  Sat Feb 20 14:53:11 2010
From: eric.lubow at gmail.com (Eric Lubow)
Date: Sat, 20 Feb 2010 14:53:11 -0500
Subject: [Ym4r-user] Clustering Issues With Google Maps
Message-ID: <91882eb1002201153h508ec649i8b938b2a7ea8a5ab@mail.gmail.com>

There seems to be very little documentation about Clustering with Google
Maps and Ym4r.  I will happily write a HOWTO once I figure this out.

Anyway, here is my question (I already asked it on StackOverflow to no avail
and it can be referenced here):
http://stackoverflow.com/questions/2278778/google-maps-cluster-not-working-with-ym4r-gm

Onto the question...

I am attempting to get a Google Maps cluster working with ym4r_gm for Rails.
I know the general code works because every point is being displayed on the
map. The problem is that every point is being displayed on the map. I only
have like 350 points (right now) so its not too bad without clustering, but
I would like to have it working so that I can scale.

Relevant controller code:


  def bizmap
    @map = GMap.new( "map" )

    @map.control_init( :large_map => true, :map_type => true )

    @map.center_zoom_init( [ 40.228,-100.283 ], 1 )

    markers = Array.new
    Business.find(:all, :include => [:addresses], :conditions =>
["addresses.website_only != 1"]).each do |biz|

      if (!biz.addresses.first.latitude.blank? and
!biz.addresses.first.longitude.blank?)

        markers.push(
          GMarker.new(

            [biz.addresses.first.latitude,biz.addresses.first.longitude],

            :title => biz.name,

            :info_window => pretty_info_window( biz.name, biz.addresses.first )

          )
        )
      end
    end

    clusterer = Clusterer.new(markers, :min_markers_per_cluster => 2)

    @map.overlay_init(clusterer)
  end

Relevant view code:


 <div id="aroundMeMapBox">
  <%= GMap.header %>

  <%= javascript_include_tag 'clusterer' %>
  <%= @map.to_html %>

  <%= @map.div(:width => 600, :height => 400) %>

 </div>

The relevant code generated by the view is here:


<script src="/javascripts/clusterer.js?1248062398" type="text/javascript">

<script type="text/javascript">
var map;

window.onload = addCodeToFunction(window.onload,function() {
if (GBrowserIsCompatible()) {

map = new GMap2(document.getElementById("map"));

map.setCenter(new GLatLng(40.228,-100.283),1);map.addOverlay(new
Clusterer([addDescriptionToMarker(addInfoWindowToMarker(new
GMarker(new GLatLng(34.086,-83.8644),{title : "Georgia
Biz"}),"*Georgia Biz*

101 Main St.
Buford, Georgia 30519",{}),"Georgia Biz") ... (removed for brevity)

map.addControl(new GMapTypeControl());
}
});
</script>

Thanks in advance for any help.

-e

--

Eric Lubow

w: eric.lubow.org
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