Thuban/Model/proj.py

# Copyright (c) 2001 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

import Projection
BaseProjection = Projection.Projection
del Projection

class Projection(BaseProjection):

    """A proj4 projection object that remembers the parameters"""

    def __init__(self, params):
        BaseProjection.__init__(self, params)
        self.params = params

    def ForwardBBox(self, bbox):
        """Return the bounding box of the corners of the bounding box bbox
        """
        # This is not really the correct way to determine the bbox of a
        # projected shape, but for now it works well enough
        llx, lly, urx, ury = bbox
        xs = []; ys = []
        x, y = self.Forward(llx, lly)
        xs.append(x); ys.append(y)
        x, y = self.Forward(llx, ury)
        xs.append(x); ys.append(y)
        x, y = self.Forward(urx, ury)
        xs.append(x); ys.append(y)
        x, y = self.Forward(urx, lly)
        xs.append(x); ys.append(y)
        return min(xs), min(ys), max(xs), max(ys)
1	bh	6	# Copyright (c) 2001 by Intevation GmbH
2			# Authors:
3			# Bernhard Herzog <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			__version__ = "$Revision$"
9
10			import Projection
11			BaseProjection = Projection.Projection
12			del Projection
13
14			class Projection(BaseProjection):
15
16			"""A proj4 projection object that remembers the parameters"""
17
18			def __init__(self, params):
19			BaseProjection.__init__(self, params)
20			self.params = params
21
22			def ForwardBBox(self, bbox):
23			"""Return the bounding box of the corners of the bounding box bbox
24			"""
25			# This is not really the correct way to determine the bbox of a
26			# projected shape, but for now it works well enough
27			llx, lly, urx, ury = bbox
28			xs = []; ys = []
29			x, y = self.Forward(llx, lly)
30			xs.append(x); ys.append(y)
31			x, y = self.Forward(llx, ury)
32			xs.append(x); ys.append(y)
33			x, y = self.Forward(urx, ury)
34			xs.append(x); ys.append(y)
35			x, y = self.Forward(urx, lly)
36			xs.append(x); ys.append(y)
37			return min(xs), min(ys), max(xs), max(ys)
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