/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/proj.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 749 by jonathan, Fri Apr 25 14:22:35 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):      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          self.params = params  
30            self.SetName(name)
31            self.SetAllParameters(params)
32    
33      def ForwardBBox(self, bbox):      def ForwardBBox(self, bbox):
34          """Return the bounding box of the corners of the bounding box bbox          """Return the bounding box of the corners of the bounding box bbox
# Line 35  class Projection(BaseProjection): Line 46  class Projection(BaseProjection):
46          x, y = self.Forward(urx, lly)          x, y = self.Forward(urx, lly)
47          xs.append(x); ys.append(y)          xs.append(x); ys.append(y)
48          return min(xs), min(ys), max(xs), max(ys)          return min(xs), min(ys), max(xs), max(ys)
49    
50        def GetName(self):
51            """Return the name of the projection."""
52            return self.name
53    
54        def SetName(self, name):
55            """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                self.name = name
65    
66        def GetParameter(self, param):
67            """Return the projection value for the given parameter.
68    
69            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            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            """Return list of 'parameter=value' strings"""
83            return self.params
84    
85        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        def __repr__(self):
99            return self.name + ": " + repr(self.params)
100    
101    class ProjFile:
102    
103        def __init__(self, filename):
104            """Intialize the ProjFile.
105    
106            filename -- name of the file that this ProjFile represents.
107            """
108    
109            self.__projs = []
110    
111            self.SetFilename(filename)
112        
113        def Add(self, proj):
114            """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    
119            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        def Remove(self, proj):
129            """Remove the objection proj from the projection file.
130    
131            Raises a ValueError is proj is not found.
132            """
133    
134            self.__projs.remove(proj)
135    
136        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        def GetProjections(self):
148            """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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