GPolyline.prototype.Contains = function(pointepoly) {
  var j=0;
  var oddNodes = false;
  var x = pointepoly.lng();
  var y = pointepoly.lat();
  for (var i=0; i < this.getVertexCount(); i++) {
    j++;
    if (j == this.getVertexCount()) {j = 0;}
    if (((this.getVertex(i).lat() < y) && (this.getVertex(j).lat() >= y))
    || ((this.getVertex(j).lat() < y) && (this.getVertex(i).lat() >= y))) {
      if ( this.getVertex(i).lng() + (y - this.getVertex(i).lat())
      /  (this.getVertex(j).lat()-this.getVertex(i).lat())
      *  (this.getVertex(j).lng() - this.getVertex(i).lng())<x ) {
        oddNodes = !oddNodes
      }
    }
  }
  return oddNodes;
}

GPolyline.prototype.Area = function() {
  var a = 0;
  var j = 0;
  var b = this.Bounds();
  var x0 = b.getSouthWest().lng();
  var y0 = b.getSouthWest().lat();
  for (var i=0; i < this.getVertexCount(); i++) {
    j++;
    if (j == this.getVertexCount()) {j = 0;}
    var x1 = this.getVertex(i).distanceFrom(new GLatLng(this.getVertex(i).lat(),x0));
    var x2 = this.getVertex(j).distanceFrom(new GLatLng(this.getVertex(j).lat(),x0));
    var y1 = this.getVertex(i).distanceFrom(new GLatLng(y0,this.getVertex(i).lng()));
    var y2 = this.getVertex(j).distanceFrom(new GLatLng(y0,this.getVertex(j).lng()));
    a += x1*y2 - x2*y1;
  }
  return Math.abs(a * 0.5);
}

GPolyline.prototype.Distance = function() {
  var dist = 0;
  for (var i=1; i < this.getVertexCount(); i++) {
    dist += this.getVertex(i).distanceFrom(this.getVertex(i-1));
  }
  return dist;
}

GPolyline.prototype.Bounds = function() {
  var bounds = new GLatLngBounds();
  for (var i=0; i < this.getVertexCount(); i++) {
    bounds.extend(this.getVertex(i));
  }
  return bounds;
}

GPolyline.prototype.GetPointAtDistance = function(metres) {
  if (metres == 0) return this.getVertex(0);
  if (metres < 0) return null;
  var dist=0;
  var olddist=0;
  for (var i=1; (i < this.getVertexCount() && dist < metres); i++) {
    olddist = dist;
    dist += this.getVertex(i).distanceFrom(this.getVertex(i-1));
  }
  if (dist < metres) {return null;}
  var p1= this.getVertex(i-2);
  var p2= this.getVertex(i-1);
  var m = (metres-olddist)/(dist-olddist);
  return new GLatLng( p1.lat() + (p2.lat()-p1.lat())*m, p1.lng() + (p2.lng()-p1.lng())*m);
}

GPolyline.prototype.GetIndexAtDistance = function(metres) {
  if (metres == 0) return this.getVertex(0);
  if (metres < 0) return null;
  var dist=0;
  var olddist=0;
  for (var i=1; (i < this.getVertexCount() && dist < metres); i++) {
    olddist = dist;
    dist += this.getVertex(i).distanceFrom(this.getVertex(i-1));
  }
  if (dist < metres) {return null;}
  return i;
}

GPolyline.prototype.Bearing = function(v1,v2) {
  if (v1 == null) {
    v1 = 0;
    v2 = this.getVertexCount()-1;
  } else if (v2 ==  null) {
    v2 = v1+1;
  }
  if ((v1 < 0) || (v1 >= this.getVertexCount()) || (v2 < 0) || (v2 >= this.getVertexCount())) {
    return;
  }
  var from = this.getVertex(v1);
  var to = this.getVertex(v2);
  if (from.equals(to)) {
    return 0;
  }
  var lat1 = from.latRadians();
  var lon1 = from.lngRadians();
  var lat2 = to.latRadians();
  var lon2 = to.lngRadians();
  var angle = - Math.atan2( Math.sin( lon1 - lon2 ) * Math.cos( lat2 ), Math.cos( lat1 ) * Math.sin( lat2 ) - Math.sin( lat1 ) * Math.cos( lat2 ) * Math.cos( lon1 - lon2 ) );
  if ( angle < 0.0 ) angle  += Math.PI * 2.0;
  angle = angle * 180.0 / Math.PI;
  return parseFloat(angle.toFixed(1));
}