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	# 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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svn:keywords	Author Date Id Revision