/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/proj.py
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revision 726 by jonathan, Thu Apr 24 16:05:56 2003 UTC revision 758 by jonathan, Tue Apr 29 09:01:12 2003 UTC
# Line 7  Line 7 
7    
8  __version__ = "$Revision$"  __version__ = "$Revision$"
9    
10    from Thuban import _
11    
12  from types import StringTypes  from types import StringTypes
13    
14  import Projection  import Projection
# Line 17  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                self.name = _("Unknown")
32            elif isinstance(name, StringTypes):
33                self.name = name
34    
35          self.params = params          self.params = params
         self.name = name  
36    
37      def ForwardBBox(self, bbox):      def ForwardBBox(self, bbox):
38          """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 37  class Projection(BaseProjection): Line 49  class Projection(BaseProjection):
49          xs.append(x); ys.append(y)          xs.append(x); ys.append(y)
50          x, y = self.Forward(urx, lly)          x, y = self.Forward(urx, lly)
51          xs.append(x); ys.append(y)          xs.append(x); ys.append(y)
52            
53          return min(xs), min(ys), max(xs), max(ys)          return min(xs), min(ys), max(xs), max(ys)
54    
55      def GetName(self):      def GetName(self):
56            """Return the name of the projection."""
57          return self.name          return self.name
58    
     def SetName(self, name):  
         if isinstance(name, StringTypes):  
             self.name = name  
   
59      def GetParameter(self, param):      def GetParameter(self, param):
60            """Return the projection value for the given parameter.
61    
62            If 'param' exists as a valid parameter then the returned
63            value is a string with that value. If the parameter doesn't
64            exist an empty string is returned.
65            """
66    
67          for pair in self.params:          for pair in self.params:
68              p, v = pair.split("=")              p, v = pair.split("=")
# Line 56  class Projection(BaseProjection): Line 72  class Projection(BaseProjection):
72          return ""          return ""
73    
74      def GetAllParameters(self):      def GetAllParameters(self):
75            """Return list of 'parameter=value' strings"""
76          return self.params          return self.params
77    
78      def __repr__(self):      def __repr__(self):
# Line 64  class Projection(BaseProjection): Line 81  class Projection(BaseProjection):
81  class ProjFile:  class ProjFile:
82    
83      def __init__(self, filename):      def __init__(self, filename):
84          self.projs = {}          """Intialize the ProjFile.
85    
86            filename -- name of the file that this ProjFile represents.
87            """
88    
89            self.__projs = []
90    
91          self.SetFileName(filename)          self.SetFilename(filename)
92            
93      def Add(self, proj):      def Add(self, proj):
94          self.projs[proj] = 0          """Add the given projection to the end of the file. If 'proj'
95            already exists, it is replaced in the same location as the
96            original projection.
97            """
98    
99            try:
100                #
101                # see if the projection already exists.
102                # this only works if Projection doesn't override __eq__
103                #
104                self.__projs[self.__projs.index(proj)] = proj
105            except ValueError:
106                self.__projs.append(proj)
107    
108      def Remove(self, proj):      def Remove(self, proj):
109          if self.projs.has_key(proj):          """Remove the object proj from the projection file.
110              del self.projs[proj]  
111            Raises a ValueError is proj is not found.
112            """
113    
114      def GetFileName(self):          self.__projs.remove(proj)
         return self.filename  
115    
116      def SetFileName(self, filename):      def Replace(self, oldproj, newproj):
117          self.filename = filename          """Replace the object 'oldproj' with 'newproj'.
118            
119            Raises ValueError if oldproj is not in the file.
120            """
121    
122            #
123            # see if the projection already exists.
124            # this only works if Projection doesn't override __eq__
125            #
126            self.__projs[self.__projs.index(oldproj)] = newproj
127    
128        def GetFilename(self):
129            """Return the filename where the ProjFile was read or will be
130            written to.
131            """
132    
133            return self.__filename
134    
135        def SetFilename(self, filename):
136            """Set the filename where the ProjFile will be written to."""
137            self.__filename = filename
138    
139      def GetProjections(self):      def GetProjections(self):
140          return self.projs.keys()          """Return a list of the projections in the order they were read
141            from the file or will be written.
142    
143            This is not a deep copy list, so any modifications made to the
144            Projection objects will be written to the file.
145            """
146    
147            return self.__projs
148    
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