How to get coordinates of a point on a polyline by meters?

I loop along an MVCArray ... trying to split the segments by an offset.

But I would requir开发者_如何学Ce a little more precision to split the poly-line at the proper points.

Basically I just would need to know how to calculate a point on a line between 2 points - defined by the last few meters.

Or is there any way to insert a verticle at this position?

Talking of Maps API V3.