def __init__(self, layers):
format = QGLFormat()
format.setVersion(3, 2)
format.setProfile(QGLFormat.CoreProfile)
QGLFormat.setDefaultFormat(format)
super(SphairaView, self).__init__()
self.old_pos = QtCore.QPoint(0, 0)
self.setMouseTracking(True)
self.setFocusPolicy(QtCore.Qt.StrongFocus)
self.layers = layers
self.zoom = 0.9
