GMap Polyline position of center - google-maps

Question

When I create Gmap she needed to establish the center and zoom
Once we've created a map via the GMap2
constructor, we need to initialize it.
This initialization is accomplished
with use of the map's setCenter ()
method. The setCenter () method
requires a GLatLng coordinate and a
zoom level and this method must be
sent before any other operations are
performed on the map, including
setting any other attributes of the
map itself.
Because of this route is not positioned at the center - this is an example http://grab.by/4OD6
I should on the basis of the coordinates to get the center?
And get a zoom which displays all objects map?
My code:
var TrainingGMap = Class.create ((
initialize: function (div_id, points, options) (
this.options = Object.extend ((), options)
this.points = points;
this.map = new GMap2 (document.getElementById (div_id));
this.map.setCenter (new GLatLng (this.points [0]. lan, this.points [0]. lon), 12);
this.map.setUIToDefault ();
this.set_route ();
)
set_route: function () (
var line = new Array ();
for (var i = 0; i <this.points.length; i + +) (
line [i] = new GLatLng (this.points [i]. lat, this.points [i]. lon);
)
var polyline = new GPolyline (line, "# aa0000", 5);
this.map.addOverlay (polyline);
)
));

Answer 1

I resolve my problem
this.map.setCenter(polyline.getBounds().getCenter());
this.map.setZoom(this.map.getBoundsZoomLevel(polyline.getBounds()));
New code
var TrainingGMap = Class.create({
initialize: function(div_id, points, options) {
this.options = Object.extend({}, options)
this.points = points;
this.map = new GMap2(document.getElementById(div_id));
this.map.setCenter(new GLatLng(this.points[0].lan, this.points[0].lon), 12);
this.map.setUIToDefault();
var line = new Array();
for (var i = 0; i < this.points.length; i++) {
line[i] = new GLatLng(this.points[i].lan,this.points[i].lon);
}
var polyline = new GPolyline(line, "#aa0000", 5);
this.map.setCenter(polyline.getBounds().getCenter());
this.map.setZoom(this.map.getBoundsZoomLevel(polyline.getBounds()));
this.map.addOverlay(polyline);
}
});

Answer 2

var TrainingGMap = Class.create({
initialize: function(div_id, points, options) {
this.options = Object.extend({}, options)
this.points = points;
this.map = new GMap2(document.getElementById(div_id));
this.map.setCenter(new GLatLng(this.points[0].lan, this.points[0].lon), 12);
this.map.setUIToDefault();
var line = new Array();
for (var i = 0; i < this.points.length; i++) {
line[i] = new GLatLng(this.points[i].lan,this.points[i].lon);
}
var polyline = new GPolyline(line, "#aa0000", 5);
var tengah=Math.round(polyline.getVertexCount()/2)-1;
this.map.setCenter(polyline.getVertex(tengah));
this.map.setZoom(this.map.getBoundsZoomLevel(polyline.getBounds()));
this.map.addOverlay(polyline);
}
});