/[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 1802 by bh, Thu Oct 9 15:18:35 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  #  #
# 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    
65          If 'param' exists as a valid parameter then the returned          If 'param' exists as a valid parameter return the associated
66          value is a string with that value. If the parameter doesn't          value as a string. If the parameter does not have a value (like
67          exist an empty string is returned.          e.g. the 'south' parameter for utm) then the value is the
68            parameter name itself.
69    
70            If the parameter doesn't exist return an empty string.
71          """          """
72    
73          for pair in self.params:          for pair in self.params:
74              p, v = pair.split("=")              if "=" in pair:
75                    p, v = pair.split("=")
76                else:
77                    p = v = pair
78              if p == param:              if p == param:
79                  return v                  return v
80    
# Line 82  class Projection(BaseProjection): Line 84  class Projection(BaseProjection):
84          """Return list of 'parameter=value' strings"""          """Return list of 'parameter=value' strings"""
85          return self.params          return self.params
86    
87      def SetAllParameters(self, params):      def GetProjectedUnits(self):
88          """Set the projection's parameters to the given parameter list."""          if self.GetParameter("proj") == "latlong":
89          self.params = params              return PROJ_UNITS_DEGREES
90            else:
91      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)  
92    
93      def __repr__(self):      def __repr__(self):
94          return self.name + ": " + repr(self.params)          return self.name + ": " + repr(self.params)
# Line 111  class ProjFile: Line 106  class ProjFile:
106          self.SetFilename(filename)          self.SetFilename(filename)
107            
108      def Add(self, proj):      def Add(self, proj):
109          """Add the given projection to the end of the file. If 'proj'          """Add the projection to the end of the file."""
110          already exists, it is replaced in the same location as the          self.__projs.append(proj)
         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)  
111    
112      def Remove(self, proj):      def Remove(self, proj):
113          """Remove the objection proj from the projection file.          """Remove the object proj from the projection file.
114    
115          Raises a ValueError is proj is not found.          Raises a ValueError is proj is not found.
116          """          """
117    
118          self.__projs.remove(proj)          self.__projs.remove(proj)
119    
120        def Replace(self, oldproj, newproj):
121            """Replace the object 'oldproj' with 'newproj'.
122            
123            Raises ValueError if oldproj is not in the file.
124            """
125    
126            #
127            # see if the projection already exists.
128            # this only works if Projection doesn't override __eq__
129            #
130            self.__projs[self.__projs.index(oldproj)] = newproj
131    
132      def GetFilename(self):      def GetFilename(self):
133          """Return the filename where the ProjFile was read or will be          """Return the filename where the ProjFile was read or will be
134          written to.          written to.
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