Fitting the map to the data
The map.getBoundsZoomLevel() method allows us to calculate a zoom level setting that fits a set of markers.
Here's an example
It is necessary tp perform a map.setCenter() call before starting to add markers.
At this point we don't know the real parameters for the call, so just use any values.
Create an empty GLatLngBounds() object.
var bounds = new GLatLngBounds();
Each time a point is read, extend the bounds to include that point.
When all the points have been processed, the zoom level can be set to fit the points.
The centre can be obtained by using the bounds.getCenter() method
You can't mix v1 compatibility mode and v2 native syntax in this code. You do need to use a GLatLngBounds(), not a GBounds(), and
you can only use a GLatLng in its .extend() method, not a GPoint.
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