'Convert from Coordinate object to a Point object in EPSG:900913'

def coordinateProj(self, coord):

    diameter = ((2 * _pi) * 6378137)
    zoom = (_log(diameter) / _log(2))
    coord = coord.zoomTo(zoom)
    point = Point(coord.column, coord.row)
    point.x = (point.x - (diameter / 2))
    point.y = ((diameter / 2) - point.y)
    return point
