Wasn't it Andrew Leach (Maps API Guru) who wrote:
>On Feb 26, 6:17 am, canada77 <[email protected]> wrote:
>> I am new to Google Maps and have been learning it quite nicely, but
>> still can't seem to find the answer to 2 questions:
>>
>> 1) I have a very large polyLine (13,000 vertexes) that has been
>> constructed from driving directions. I want to overlay an image at
>> specific vertexes along the polyLine, but do not want to overlay the
>> images that are not currently visible (causes considerable slowdown).
>> How can I determine, based on the current map view, which vertexes of
>> the polyLine are currently visible? I can then add the GroundOverlay
>> at only the visible vertexes.
>
>This is a classic case for something like a Marker Manager. Have you
>tried adding your overlays to a marker manager? (Note: I have no idea
>whether either GMarkerManager or the open-source version can cope with
>anything other than markers, but it's worth a try)
MarkerManager can cope with any GOverlay that has a .getPoint() Method.
So that's only GMarkers and some custom GOverlays (e.g. ELabels)
GMarkerManager can cope with any GOverlay that has the unexposed
equivalent of a .getPoint() or .getLatLng() Method. So that's only
GMarkers.
You might possibly be able to extend the GGroundOverlay class to provide
a .getPoint() method. You'd have to store the information somewhere,
perhaps as a custom Property of the GGroundOverlay when you create it
GGroundOverlay.prototype.getPoint = function() {
return this.Centre;
}
var g = new GGroundOverlay(image,bounds);
g.Centre = bounds.getCenter();
The problem then would be that when you zoom in, GGroundOverlays that
partially overlap the viewport, but have centres that are outside the
(viewport + padding) might not be displayed.
--
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team
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