First you need to ind out how much a pixel is worth in degrees of Lat/
Lon at the current zoom and at the relevant location. Once you know
that, you can use that information to set the width of your polyline
in meters.

//NOT TESTED!
var lineWidth = 25; //miles
var proj = map.getCurrentMapType().getProjection()
var centerPx = proj.fromLatLngToPixel(center, zoom);
var neightbourLatLon =  proj.fromPixelToLatLng(new GPoint(centerPx.x
+1,centerPx.y), zoom);

//divide by 1609 to get miles. If you want meters don't divide.
var dPx = neightbourLatLon.distanceFrom(center) / 1609.344;

var pxWidth = Math.ceil(lineWidth / dPx) * 2;

var poly = new GPolyline(pLinePoints,'#FFFF00',pxWidth, 0.30);
map.addOverlay(poly);


I'm using a similar approach here:
http://maps.forum.nu/gm_texas.html
... but the code is a little messy. :-)

--
Marcelo - http://maps.forum.nu
--


On Aug 13, 6:47 pm, Patrice <[email protected]> wrote:
> Hi everybody !
>
> I'm French so sorry for my English mistakes.
>
> I can't find the solution to my problem anywhere ! You all know that
> we can set the width of a polyline thanks to the option "weight". But
> the value has to be in pixels.
>
> I would like to know how I can do to set the width of my polyline to x
> meters (x=20 for instance). In other words, how do you convert meters
> to pixels, according to the zoom level ?
>
> Thank you for your help !
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