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The GDAL/OGR library uses an Envelope structure to hold the bounding
box information for a geometry. The envelope (bounding box) contains
two pairs of coordinates, one for the lower left coordinate and one
for the upper right coordinate:
+----------o Upper right; (max_x, max_y)
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Lower left (min_x, min_y) o----------+
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The Envelope object is a C structure that contains the minimum and
maximum X, Y coordinates for a rectangle bounding box. The naming
of the variables is compatible with the OGR Envelope structure.
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The initialization function may take an OGREnvelope structure, 4-element
tuple or list, or 4 individual arguments.
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isinstancer � _envelope�tuple�listr �_from_sequence� TypeError�type�min_x�max_x�min_y�max_y)�self�argsr r r �__init__% s �zEnvelope.__init__c C s� t |t�r | j|jko | j|jko | j|jko | j|jkS t |t�rDt|�dkrD| j|d koC| j|d koC| j|d koC| j|d kS td��)zx
Return True if the envelopes are equivalent; can compare against
other Envelopes and 4-tuples.
r r r � � z4Equivalence testing only works with other Envelopes.) r r r# r% r$ r& r r r )r' �otherr r r �__eq__D s
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zEnvelope.__str__c C s< t � | _|d | j_|d | j_|d | j_|d | j_dS )z@Initialize the C OGR Envelope structure from the given sequence.r r r* r+ N)r r r r r r )r' �seqr r r r V s
zEnvelope._from_sequencec G s� t |�dkr�t|d t�r| �|d j�S t|d d�r7t|d d�r7| �|d j|d j|d j|d j�S t|d ttf�r�t |d �dkra| �|d d |d d |d d |d d f�S t |d �dkr�|d \}}}}|| j j
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Modify the envelope to expand to include the boundaries of
the passed-in 2-tuple (a point), 4-tuple (an extent) or
envelope.
r r �x�yr* r r r r N)r r r �expand_to_includer �hasattrr2 r3 r r r r r r r r! r" )r' r( �minx�miny�maxx�maxyr r r r4 ^ s4
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zEnvelope.expand_to_includec C � | j jS )z-Return the value of the minimum X coordinate.)r r r/ r r r r# � � zEnvelope.min_xc C r: )z-Return the value of the minimum Y coordinate.)r r r/ r r r r% � r; zEnvelope.min_yc C r: )z-Return the value of the maximum X coordinate.)r r r/ r r r r$ � r; zEnvelope.max_xc C r: )z-Return the value of the maximum Y coordinate.)r r r/ r r r r& � r; zEnvelope.max_yc C � | j | jfS )z"Return the upper-right coordinate.)r$ r& r/ r r r �ur� � z Envelope.urc C r< )z!Return the lower-left coordinate.)r# r% r/ r r r �ll� r> z Envelope.llc C s | j | j| j| jfS )z)Return a tuple representing the envelope.)r# r% r$ r& r/ r r r r � s zEnvelope.tuplec C s0 d| j | j| j | j| j| j| j| j| j | jf
S )z4Return WKT representing a Polygon for this envelope.z(POLYGON((%s %s,%s %s,%s %s,%s %s,%s %s)))r# r% r& r$ r/ r r r �wkt� s ��z Envelope.wktN)r
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