/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/proj.py
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revision 695 by jonathan, Wed Apr 16 16:39:36 2003 UTC revision 745 by jonathan, Fri Apr 25 10:26:50 2003 UTC
# Line 7  Line 7 
7    
8  __version__ = "$Revision$"  __version__ = "$Revision$"
9    
10    from Thuban import _
11    
12    from types import StringTypes
13    
14  import Projection  import Projection
15  BaseProjection = Projection.Projection  BaseProjection = Projection.Projection
16  del Projection  del Projection
# Line 15  class Projection(BaseProjection): Line 19  class Projection(BaseProjection):
19    
20      """A proj4 projection object that remembers the parameters"""      """A proj4 projection object that remembers the parameters"""
21    
22      def __init__(self, params, name = "Unknown"):      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          BaseProjection.__init__(self, params)          BaseProjection.__init__(self, params)
29    
30            if name is None:
31                name = _("Unknown")
32    
33          self.params = params          self.params = params
34          self.name = name          self.name = name
35    
# Line 38  class Projection(BaseProjection): Line 51  class Projection(BaseProjection):
51          return min(xs), min(ys), max(xs), max(ys)          return min(xs), min(ys), max(xs), max(ys)
52    
53      def GetName(self):      def GetName(self):
54            """Return the name of the projection."""
55          return self.name          return self.name
56    
57      def GetParameters(self):      def SetName(self, name):
58            """Set the name of the projection."""
59            if isinstance(name, StringTypes):
60                self.name = name
61    
62        def GetParameter(self, param):
63            """Return the projection value for the given parameter.
64    
65            If 'param' exists as a valid parameter then the returned
66            value is a string with that value. If the parameter doesn't
67            exist an empty string is returned.
68            """
69    
70            for pair in self.params:
71                p, v = pair.split("=")
72                if p == param:
73                    return v
74    
75            return ""
76    
77        def GetAllParameters(self):
78            """Return list of 'parameter=value' strings"""
79          return self.params          return self.params
80    
81      def __repr__(self):      def __repr__(self):
82          return repr(self.params)          return self.name + ": " + repr(self.params)
83    
84  class ProjFile:  class ProjFile:
85    
86      def __init__(self, filename):      def __init__(self, filename):
87          self.projs = []          """Intialize the ProjFile.
88    
89            filename -- name of the file that this ProjFile represents.
90            """
91    
92            self.__projs = []
93    
94          self.SetFileName(filename)          self.SetFilename(filename)
95            
96      def Add(self, proj):      def Add(self, proj):
97          self.projs.append(proj)          """Add the given projection to the end of the file. If 'proj'
98            already exists, it is replaced in the same location as the
99            original projection.
100            """
101    
102            try:
103                #
104                # see if the projection already exists.
105                # this only works if Projection doesn't override __eq__
106                #
107                self.__projs[self.__projs.index(proj)] = proj
108            except ValueError:
109                self.__projs.append(proj)
110    
111        def Remove(self, proj):
112            """Remove the objection proj from the projection file.
113    
114            Raises a ValueError is proj is not found.
115            """
116    
117            self.__projs.remove(proj)
118    
119      def GetFileName(self):      def GetFilename(self):
120          return self.filename          """Return the filename where the ProjFile was read or will be
121            written to.
122            """
123    
124            return self.__filename
125    
126      def SetFileName(self, filename):      def SetFilename(self, filename):
127          self.filename = filename          """Set the filename where the ProjFile will be written to."""
128            self.__filename = filename
129    
130      def GetProjections(self):      def GetProjections(self):
131          return self.projs          """Return a list of the projections in the order they were read
132            from the file or will be written.
133    
134            This is not a deep copy list, so any modifications made to the
135            Projection objects will be written to the file.
136            """
137    
138            return self.__projs
139    
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