How to use the labelme.shape.Shape function in labelme

def loadLabels(self, shapes):
        s = []
        for label, points, line_color, fill_color, shape_type, flags in shapes:
            shape = Shape(label=label, shape_type=shape_type)
            for x, y in points:
                shape.addPoint(QtCore.QPointF(x, y))
            shape.close()

            if line_color:
                shape.line_color = QtGui.QColor(*line_color)

            if fill_color:
                shape.fill_color = QtGui.QColor(*fill_color)

            default_flags = {}
            if self._config['label_flags']:
                for pattern, keys in self._config['label_flags'].items():
                    if re.match(pattern, label):
                        for key in keys:
                            default_flags[key] = False

self.settings = QtCore.QSettings('labelme', 'labelme')
        # FIXME: QSettings.value can return None on PyQt4
        self.recentFiles = self.settings.value('recentFiles', []) or []
        size = self.settings.value('window/size', QtCore.QSize(600, 500))
        position = self.settings.value('window/position', QtCore.QPoint(0, 0))
        self.resize(size)
        self.move(position)
        # or simply:
        # self.restoreGeometry(settings['window/geometry']
        self.restoreState(
            self.settings.value('window/state', QtCore.QByteArray()))
        self.lineColor = QtGui.QColor(
            self.settings.value('line/color', Shape.line_color))
        self.fillColor = QtGui.QColor(
            self.settings.value('fill/color', Shape.fill_color))
        Shape.line_color = self.lineColor
        Shape.fill_color = self.fillColor

        # Populate the File menu dynamically.
        self.updateFileMenu()
        # Since loading the file may take some time,
        # make sure it runs in the background.
        if self.filename is not None:
            self.queueEvent(functools.partial(self.loadFile, self.filename))

        # Callbacks:
        self.zoomWidget.valueChanged.connect(self.paintCanvas)

        self.populateModeActions()

self.epsilon = kwargs.pop('epsilon', 10.0)
        super(Canvas, self).__init__(*args, **kwargs)
        # Initialise local state.
        self.mode = self.EDIT
        self.shapes = []
        self.shapesBackups = []
        self.current = None
        self.selectedShapes = []  # save the selected shapes here
        self.selectedShapesCopy = []
        self.lineColor = QtGui.QColor(0, 0, 255)
        # self.line represents:
        #   - createMode == 'polygon': edge from last point to current
        #   - createMode == 'rectangle': diagonal line of the rectangle
        #   - createMode == 'line': the line
        #   - createMode == 'point': the point
        self.line = Shape(line_color=self.lineColor)
        self.prevPoint = QtCore.QPoint()
        self.prevMovePoint = QtCore.QPoint()
        self.offsets = QtCore.QPoint(), QtCore.QPoint()
        self.scale = 1.0
        self.pixmap = QtGui.QPixmap()
        self.visible = {}
        self._hideBackround = False
        self.hideBackround = False
        self.hShape = None
        self.hVertex = None
        self.hEdge = None
        self.movingShape = False
        self._painter = QtGui.QPainter()
        self._cursor = CURSOR_DEFAULT
        # Menus:
        # 0: right-click without selection and dragging of shapes

# XXX: Could be completely declarative.
        # Restore application settings.
        self.settings = QtCore.QSettings('labelme', 'labelme')
        # FIXME: QSettings.value can return None on PyQt4
        self.recentFiles = self.settings.value('recentFiles', []) or []
        size = self.settings.value('window/size', QtCore.QSize(600, 500))
        position = self.settings.value('window/position', QtCore.QPoint(0, 0))
        self.resize(size)
        self.move(position)
        # or simply:
        # self.restoreGeometry(settings['window/geometry']
        self.restoreState(
            self.settings.value('window/state', QtCore.QByteArray()))
        self.lineColor = QtGui.QColor(
            self.settings.value('line/color', Shape.line_color))
        self.fillColor = QtGui.QColor(
            self.settings.value('fill/color', Shape.fill_color))
        Shape.line_color = self.lineColor
        Shape.fill_color = self.fillColor

        # Populate the File menu dynamically.
        self.updateFileMenu()
        # Since loading the file may take some time,
        # make sure it runs in the background.
        if self.filename is not None:
            self.queueEvent(functools.partial(self.loadFile, self.filename))

        # Callbacks:
        self.zoomWidget.valueChanged.connect(self.paintCanvas)

        self.populateModeActions()

def paintEvent(self, event):
        if not self.pixmap:
            return super(Canvas, self).paintEvent(event)

        p = self._painter
        p.begin(self)
        p.setRenderHint(QtGui.QPainter.Antialiasing)
        p.setRenderHint(QtGui.QPainter.HighQualityAntialiasing)
        p.setRenderHint(QtGui.QPainter.SmoothPixmapTransform)

        p.scale(self.scale, self.scale)
        p.translate(self.offsetToCenter())

        p.drawPixmap(0, 0, self.pixmap)
        Shape.scale = self.scale
        for shape in self.shapes:
            if (shape.selected or not self._hideBackround) and \
                    self.isVisible(shape):
                shape.fill = shape.selected or shape == self.hShape
                shape.paint(p)
        if self.current:
            self.current.paint(p)
            self.line.paint(p)
        if self.selectedShapesCopy:
            for s in self.selectedShapesCopy:
                s.paint(p)

        if (self.fillDrawing() and self.createMode == 'polygon' and
                self.current is not None and len(self.current.points) >= 2):
            drawing_shape = self.current.copy()
            drawing_shape.addPoint(self.line[1])