You could certainly do it programmatically. That's how it's done with the
scrollwheel, and though I never used the v2 zoomIn method as described, it
would be how it was done there, too. Basically, you would need to take the
LatLng you're wanting to zoom around and calculate a new center point based on
the following formulae:
newCenterLat = givenLat + ((currentCenterLat - givenLat) * Math.pow(.5,
currentZoom - newZoom));
newCenterLng = givenLng + ((currentCenterLng - givenLng) * Math.pow(.5,
currentZoom - newZoom));
You would then call something like this:
map.setOptions({
center : new google.maps.LatLng(newCenterLat, newCenterLng),
zoom : newZoom
});
And you should zoom in or out around the given point. I.e., the given point
should remain fixed within your display, regardless of where it is on the map.
Jeremy R. Geerdes
Generally Cool Guy
Des Moines, IA
For more information or a project quote:
[email protected]
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On Oct 16, 2011, at 5:30 AM, pinksy wrote:
> Thanks Joseph.
>
> Is there any way of doing it without the scrollwheel? The zoom option from
> the context menu in http://maps.google.com/ does it without a scrollwheel.
>
> Ideally I want to be able to specify a LatLng point programmatically, and
> call a zoom function to zoom about that point. I noticed that V2 of the API
> has something similar: GMap2.zoomIn(latlng?:GLatLng, doCenter?:Boolean,
> doContinuousZoom?:Boolean)
>
> Cheers
>
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