/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/proj.py
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revision 749 by jonathan, Fri Apr 25 14:22:35 2003 UTC revision 1250 by jonathan, Fri Jun 20 09:27:43 2003 UTC
# Line 15  import Projection Line 15  import Projection
15  BaseProjection = Projection.Projection  BaseProjection = Projection.Projection
16  del Projection  del Projection
17    
18    PROJ_UNITS_METERS  = 1
19    PROJ_UNITS_DEGREES = 2
20    
21  class Projection(BaseProjection):  class Projection(BaseProjection):
22    
23      """A proj4 projection object that remembers the parameters"""      """A proj4 projection object that remembers the parameters"""
# Line 27  class Projection(BaseProjection): Line 30  class Projection(BaseProjection):
30    
31          BaseProjection.__init__(self, params)          BaseProjection.__init__(self, params)
32    
33          self.SetName(name)          if name is None:
34          self.SetAllParameters(params)              self.name = _("Unknown")
35            elif isinstance(name, StringTypes):
36                self.name = name
37    
38            self.params = params
39    
40      def ForwardBBox(self, bbox):      def ForwardBBox(self, bbox):
41          """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 45  class Projection(BaseProjection): Line 52  class Projection(BaseProjection):
52          xs.append(x); ys.append(y)          xs.append(x); ys.append(y)
53          x, y = self.Forward(urx, lly)          x, y = self.Forward(urx, lly)
54          xs.append(x); ys.append(y)          xs.append(x); ys.append(y)
55            
56          return min(xs), min(ys), max(xs), max(ys)          return min(xs), min(ys), max(xs), max(ys)
57    
58      def GetName(self):      def GetName(self):
59          """Return the name of the projection."""          """Return the name of the projection."""
60          return self.name          return self.name
61    
     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  
   
62      def GetParameter(self, param):      def GetParameter(self, param):
63          """Return the projection value for the given parameter.          """Return the projection value for the given parameter.
64    
# Line 82  class Projection(BaseProjection): Line 78  class Projection(BaseProjection):
78          """Return list of 'parameter=value' strings"""          """Return list of 'parameter=value' strings"""
79          return self.params          return self.params
80    
81      def SetAllParameters(self, params):      def GetProjectedUnits(self):
82          """Set the projection's parameters to the given parameter list."""          if self.GetParameter("proj") == "latlong":
83          self.params = params              return PROJ_UNITS_DEGREES
84            else:
85      def SetProjection(self, proj):              return PROJ_UNITS_METERS
         """Set the projection properties to those of the given projection.  
   
         This does not copy the object.  
         """  
   
         self.SetName(proj.name)  
         self.SetAllParameters(proj.params)  
86    
87      def __repr__(self):      def __repr__(self):
88          return self.name + ": " + repr(self.params)          return self.name + ": " + repr(self.params)
# Line 126  class ProjFile: Line 115  class ProjFile:
115              self.__projs.append(proj)              self.__projs.append(proj)
116    
117      def Remove(self, proj):      def Remove(self, proj):
118          """Remove the objection proj from the projection file.          """Remove the object proj from the projection file.
119    
120          Raises a ValueError is proj is not found.          Raises a ValueError is proj is not found.
121          """          """
122    
123          self.__projs.remove(proj)          self.__projs.remove(proj)
124    
125        def Replace(self, oldproj, newproj):
126            """Replace the object 'oldproj' with 'newproj'.
127            
128            Raises ValueError if oldproj is not in the file.
129            """
130    
131            #
132            # see if the projection already exists.
133            # this only works if Projection doesn't override __eq__
134            #
135            self.__projs[self.__projs.index(oldproj)] = newproj
136    
137      def GetFilename(self):      def GetFilename(self):
138          """Return the filename where the ProjFile was read or will be          """Return the filename where the ProjFile was read or will be
139          written to.          written to.
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