/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/proj.py
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revision 745 by jonathan, Fri Apr 25 10:26:50 2003 UTC revision 1797 by bh, Thu Oct 9 10:00:06 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 28  class Projection(BaseProjection): Line 31  class Projection(BaseProjection):
31          BaseProjection.__init__(self, params)          BaseProjection.__init__(self, params)
32    
33          if name is None:          if name is None:
34              name = _("Unknown")              self.name = _("Unknown")
35            elif isinstance(name, StringTypes):
36                self.name = name
37    
38          self.params = params          self.params = params
         self.name = name  
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 48  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 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 78  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 GetProjectedUnits(self):
88            if self.GetParameter("proj") == "latlong":
89                return PROJ_UNITS_DEGREES
90            else:
91                return PROJ_UNITS_METERS
92    
93      def __repr__(self):      def __repr__(self):
94          return self.name + ": " + repr(self.params)          return self.name + ": " + repr(self.params)
95    
# Line 109  class ProjFile: Line 121  class ProjFile:
121              self.__projs.append(proj)              self.__projs.append(proj)
122    
123      def Remove(self, proj):      def Remove(self, proj):
124          """Remove the objection proj from the projection file.          """Remove the object proj from the projection file.
125    
126          Raises a ValueError is proj is not found.          Raises a ValueError is proj is not found.
127          """          """
128    
129          self.__projs.remove(proj)          self.__projs.remove(proj)
130    
131        def Replace(self, oldproj, newproj):
132            """Replace the object 'oldproj' with 'newproj'.
133            
134            Raises ValueError if oldproj is not in the file.
135            """
136    
137            #
138            # see if the projection already exists.
139            # this only works if Projection doesn't override __eq__
140            #
141            self.__projs[self.__projs.index(oldproj)] = newproj
142    
143      def GetFilename(self):      def GetFilename(self):
144          """Return the filename where the ProjFile was read or will be          """Return the filename where the ProjFile was read or will be
145          written to.          written to.
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