gistfile1.txt

  ,previewCenter: function() {
    var tile = this.getMostPopulatedTile();

    if ( tile == null ) {
      return { span: null, coords: null, params: null }
    }

    var map_projection = this.gmap.getCurrentMapType().getProjection();

    var x = tile.x * 256 + 128;
    var y = tile.y * 256 + 128;
    var center_coords = map_projection.fromPixelToLatLng(new GPoint(x, y), this.gmap.getZoom());

    x = tile.x * 256;
    y = tile.y * 256;
    var top_left = map_projection.fromPixelToLatLng(new GPoint(x, y), this.gmap.getZoom());

    x += 256;
    y += 256;
    var bottom_right = map_projection.fromPixelToLatLng(new GPoint(x, y), this.gmap.getZoom());

    var span = { x: Math.abs(bottom_right.x - top_left.x), y: Math.abs(bottom_right.y - top_left.y) }


    return {
      span: (span.y +"," + span.x),
      coords: (center_coords.y + "," + center_coords.x),
      params: 'center=' + (span.y + "," + span.x) + '&span=' + (center_coords.y + "," + center_coords.x)
    };
  }