envelope.py 文件源码

def __init__(self, *args):
        """
        The initialization function may take an OGREnvelope structure, 4-element
        tuple or list, or 4 individual arguments.
        """

        if len(args) == 1:
            if isinstance(args[0], OGREnvelope):
                # OGREnvelope (a ctypes Structure) was passed in.
                self._envelope = args[0]
            elif isinstance(args[0], (tuple, list)):
                # A tuple was passed in.
                if len(args[0]) != 4:
                    raise GDALException('Incorrect number of tuple elements (%d).' % len(args[0]))
                else:
                    self._from_sequence(args[0])
            else:
                raise TypeError('Incorrect type of argument: %s' % str(type(args[0])))
        elif len(args) == 4:
            # Individual parameters passed in.
            #  Thanks to ww for the help
            self._from_sequence([float(a) for a in args])
        else:
            raise GDALException('Incorrect number (%d) of arguments.' % len(args))

        # Checking the x,y coordinates
        if self.min_x > self.max_x:
            raise GDALException('Envelope minimum X > maximum X.')
        if self.min_y > self.max_y:
            raise GDALException('Envelope minimum Y > maximum Y.')