Hi,

I am creating an application where the user can drag a route that has
been fetched with GDirections. For that, I am using a code similar to
the demo in the GMAPI website, http://www.marsrutai.info/directions.htm.
In this code, during a mouse move, the algorithm finds the nearest
point in the route to the position of the mouse to decide whether to
put a drag marker or not.

The problem is that when the route is too large, like crossing the US
from left to right, and using a high zoom level (so that I can see the
entire US), it starts to get slow. I think the main problem is because
the polyline actually has many vertexes, and since I have to iterate
over all of them, it is getting quite slow. But I am only interested
in the vertexes that are visible in a given zoom level, not all of
them.

So, is there a way to get only the vertexes of the polyline that are
actually being drawn?

Thanks in advance,
Vitor Costa.

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