//center: centre du cercle type: GPoint
	//radius: le rayon du cercle en metres
	//numPoints: le nom de points d'approximation du cercle
	function DrawCircle (center, radius, numPoints) {
	  var a=map.fromDivPixelToLatLng(new GPoint(center.x,center.y));
      var b=map.fromDivPixelToLatLng(new GPoint(center.x+1,center.y));
      var dist = a.distanceFrom(b);

    var meters = (radius*1000/dist);
    var startRadians = 0;
    var points = [];

    for (var i = 0; i < numPoints; i++) {
        var radians = startRadians + 2 * Math.PI * i / numPoints;
        points.push(map.fromDivPixelToLatLng(new GPoint(
                center.x +  (Math.cos(radians))*meters,
                center.y +  (Math.sin(radians))*meters)));
    }
    points.push(points[0]);
ct=map.fromDivPixelToLatLng(center);

    return new GPolyline(points,"#0000FF",3);
}


function IsNear(a,b)
{
apix=map.fromLatLngToDivPixel(a.getPoint());
bpix=map.fromLatLngToDivPixel(b.getPoint());
var dist=(apix.x-bpix.x)*(apix.x-bpix.x) + (apix.y-bpix.y)*(apix.y-bpix.y);
//Mofifier (dist<200) pour changer le rayon de la zone dans laquelle deux marqueurs sont considérés comme proches.
//dist est la distance au carré en pixel entre les deux points
if (dist<200) return true;
else return false;
}