models.py 文件源码

def bbox(self):
        """
        If the Location is a Circle, Rectangle, Polygon, or MultiPolygon,
        returns the smallest rectangle that encompasses the Location's
        geometry. Otherwise returns None.
        """
        if self.shape is 'Circle':
            return shapes.convert_circle_to_rectangle(self.geom, self.buffer_m)

        elif self.shape is'Rectangle':
            return self.geom

        elif self.shape is 'Polygon' or self.shape is 'MultiPolygon':
            return self.geom.envelope

        else:
            return None