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__ = "$Revision$"

from Thuban import _

from types import StringTypes

import Projection
BaseProjection = Projection.Projection
del Projection

class Projection(BaseProjection):

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

    def __init__(self, params, name = None):
        """Initialize the Projection with a list of 
        'parameter=value' strings and an optional name. If 'name' is
        None, the name will be set to 'Unknown' in the local language.
        """

        BaseProjection.__init__(self, params)

        self.SetName(name)
        self.SetAllParameters(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)

    def GetName(self):
        """Return the name of the projection."""
        return self.name

    def SetName(self, name):
        """Set the name of the projection.

        If 'name' is None, the name will be set to 'Unknown' 
        in the local language.
        """

        if name is None:
            self.name = _("Unknown")
        elif isinstance(name, StringTypes):
            self.name = name

    def GetParameter(self, param):
        """Return the projection value for the given parameter.

        If 'param' exists as a valid parameter then the returned
        value is a string with that value. If the parameter doesn't
        exist an empty string is returned.
        """

        for pair in self.params:
            p, v = pair.split("=")
            if p == param:
                return v

        return ""

    def GetAllParameters(self):
        """Return list of 'parameter=value' strings"""
        return self.params

    def SetAllParameters(self, params):
        """Set the projection's parameters to the given parameter list."""
        self.params = params

    def SetProjection(self, proj):
        """Set the projection properties to those of the given projection.

        This does not copy the object.
        """

        self.SetName(proj.name)
        self.SetAllParameters(proj.params)

    def __repr__(self):
        return self.name + ": " + repr(self.params)

class ProjFile:

    def __init__(self, filename):
        """Intialize the ProjFile.

        filename -- name of the file that this ProjFile represents.
        """

        self.__projs = []

        self.SetFilename(filename)
    
    def Add(self, proj):
        """Add the given projection to the end of the file. If 'proj'
        already exists, it is replaced in the same location as the
        original projection.
        """

        try:
            #
            # see if the projection already exists.
            # this only works if Projection doesn't override __eq__
            #
            self.__projs[self.__projs.index(proj)] = proj
        except ValueError:
            self.__projs.append(proj)

    def Remove(self, proj):
        """Remove the objection proj from the projection file.

        Raises a ValueError is proj is not found.
        """

        self.__projs.remove(proj)

    def GetFilename(self):
        """Return the filename where the ProjFile was read or will be
        written to.
        """

        return self.__filename

    def SetFilename(self, filename):
        """Set the filename where the ProjFile will be written to."""
        self.__filename = filename

    def GetProjections(self):
        """Return a list of the projections in the order they were read
        from the file or will be written.

        This is not a deep copy list, so any modifications made to the
        Projection objects will be written to the file.
        """

        return self.__projs

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	jonathan	745	from Thuban import _
11
12	jonathan	726	from types import StringTypes
13
14	bh	6	import Projection
15			BaseProjection = Projection.Projection
16			del Projection
17
18			class Projection(BaseProjection):
19
20			"""A proj4 projection object that remembers the parameters"""
21
22	jonathan	745	def __init__(self, params, name = None):
23			"""Initialize the Projection with a list of
24			'parameter=value' strings and an optional name. If 'name' is
25			None, the name will be set to 'Unknown' in the local language.
26			"""
27
28	bh	6	BaseProjection.__init__(self, params)
29	jonathan	745
30	jonathan	749	self.SetName(name)
31			self.SetAllParameters(params)
32	jonathan	745
33	bh	6	def ForwardBBox(self, bbox):
34			"""Return the bounding box of the corners of the bounding box bbox
35			"""
36			# This is not really the correct way to determine the bbox of a
37			# projected shape, but for now it works well enough
38			llx, lly, urx, ury = bbox
39			xs = []; ys = []
40			x, y = self.Forward(llx, lly)
41			xs.append(x); ys.append(y)
42			x, y = self.Forward(llx, ury)
43			xs.append(x); ys.append(y)
44			x, y = self.Forward(urx, ury)
45			xs.append(x); ys.append(y)
46			x, y = self.Forward(urx, lly)
47			xs.append(x); ys.append(y)
48			return min(xs), min(ys), max(xs), max(ys)
49	jonathan	695
50			def GetName(self):
51	jonathan	738	"""Return the name of the projection."""
52	jonathan	695	return self.name
53
54	jonathan	726	def SetName(self, name):
55	jonathan	749	"""Set the name of the projection.
56
57			If 'name' is None, the name will be set to 'Unknown'
58			in the local language.
59			"""
60
61			if name is None:
62			self.name = _("Unknown")
63			elif isinstance(name, StringTypes):
64	jonathan	726	self.name = name
65
66	jonathan	708	def GetParameter(self, param):
67	jonathan	738	"""Return the projection value for the given parameter.
68	jonathan	708
69	jonathan	738	If 'param' exists as a valid parameter then the returned
70			value is a string with that value. If the parameter doesn't
71			exist an empty string is returned.
72			"""
73
74	jonathan	708	for pair in self.params:
75			p, v = pair.split("=")
76			if p == param:
77			return v
78
79			return ""
80
81			def GetAllParameters(self):
82	jonathan	738	"""Return list of 'parameter=value' strings"""
83	jonathan	695	return self.params
84
85	jonathan	749	def SetAllParameters(self, params):
86			"""Set the projection's parameters to the given parameter list."""
87			self.params = params
88
89			def SetProjection(self, proj):
90			"""Set the projection properties to those of the given projection.
91
92			This does not copy the object.
93			"""
94
95			self.SetName(proj.name)
96			self.SetAllParameters(proj.params)
97
98	jonathan	695	def __repr__(self):
99	jonathan	726	return self.name + ": " + repr(self.params)
100	jonathan	695
101			class ProjFile:
102
103			def __init__(self, filename):
104	jonathan	738	"""Intialize the ProjFile.
105	jonathan	695
106	jonathan	738	filename -- name of the file that this ProjFile represents.
107			"""
108
109			self.__projs = []
110
111			self.SetFilename(filename)
112	jonathan	695
113			def Add(self, proj):
114	jonathan	738	"""Add the given projection to the end of the file. If 'proj'
115			already exists, it is replaced in the same location as the
116			original projection.
117			"""
118	jonathan	695
119	jonathan	738	try:
120			#
121			# see if the projection already exists.
122			# this only works if Projection doesn't override __eq__
123			#
124			self.__projs[self.__projs.index(proj)] = proj
125			except ValueError:
126			self.__projs.append(proj)
127
128	jonathan	726	def Remove(self, proj):
129	jonathan	738	"""Remove the objection proj from the projection file.
130	jonathan	726
131	jonathan	738	Raises a ValueError is proj is not found.
132			"""
133	jonathan	695
134	jonathan	738	self.__projs.remove(proj)
135	jonathan	695
136	jonathan	738	def GetFilename(self):
137			"""Return the filename where the ProjFile was read or will be
138			written to.
139			"""
140
141			return self.__filename
142
143			def SetFilename(self, filename):
144			"""Set the filename where the ProjFile will be written to."""
145			self.__filename = filename
146
147	jonathan	695	def GetProjections(self):
148	jonathan	738	"""Return a list of the projections in the order they were read
149			from the file or will be written.
150
151			This is not a deep copy list, so any modifications made to the
152			Projection objects will be written to the file.
153			"""
154
155			return self.__projs
156
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svn:keywords	Author Date Id Revision