/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/proj.py
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revision 758 by jonathan, Tue Apr 29 09:01:12 2003 UTC revision 1815 by bh, Mon Oct 13 15:53:39 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"""
24    
25      def __init__(self, params, name = None):      def __init__(self, params, name = None, epsg = None):
26          """Initialize the Projection with a list of          """Initialize the Projection
27          'parameter=value' strings and an optional name. If 'name' is  
28          None, the name will be set to 'Unknown' in the local language.          Parameters:
29          """  
30            params -- a list of 'parameter=value' strings
31    
32            name -- (optional) The name of the projectin. If None or omitted
33                    it defaults to 'Unknown' in the local language.
34    
35            epsg -- (optional) The EPSG code as a string.
36            """
37          BaseProjection.__init__(self, params)          BaseProjection.__init__(self, params)
38    
39          if name is None:          if name is None:
# Line 32  class Projection(BaseProjection): Line 41  class Projection(BaseProjection):
41          elif isinstance(name, StringTypes):          elif isinstance(name, StringTypes):
42              self.name = name              self.name = name
43    
44            self.epsg = epsg
45          self.params = params          self.params = params
46    
47      def ForwardBBox(self, bbox):      def ForwardBBox(self, bbox):
# Line 56  class Projection(BaseProjection): Line 66  class Projection(BaseProjection):
66          """Return the name of the projection."""          """Return the name of the projection."""
67          return self.name          return self.name
68    
69        def Label(self):
70            if self.epsg:
71                return "EPSG % 5s %s" % (self.epsg, self.name)
72            return self.name
73    
74        def EPSGCode(self):
75            """Return the EPSG code as a string or None if there is none"""
76            return self.epsg
77    
78      def GetParameter(self, param):      def GetParameter(self, param):
79          """Return the projection value for the given parameter.          """Return the projection value for the given parameter.
80    
81          If 'param' exists as a valid parameter then the returned          If 'param' exists as a valid parameter return the associated
82          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
83          exist an empty string is returned.          e.g. the 'south' parameter for utm) then the value is the
84            parameter name itself.
85    
86            If the parameter doesn't exist return an empty string.
87          """          """
88    
89          for pair in self.params:          for pair in self.params:
90              p, v = pair.split("=")              if "=" in pair:
91                    p, v = pair.split("=")
92                else:
93                    p = v = pair
94              if p == param:              if p == param:
95                  return v                  return v
96    
# Line 75  class Projection(BaseProjection): Line 100  class Projection(BaseProjection):
100          """Return list of 'parameter=value' strings"""          """Return list of 'parameter=value' strings"""
101          return self.params          return self.params
102    
103        def GetProjectedUnits(self):
104            if self.GetParameter("proj") == "latlong":
105                return PROJ_UNITS_DEGREES
106            else:
107                return PROJ_UNITS_METERS
108    
109      def __repr__(self):      def __repr__(self):
110          return self.name + ": " + repr(self.params)          return self.name + ": " + repr(self.params)
111    
112    
113  class ProjFile:  class ProjFile:
114    
115      def __init__(self, filename):      def __init__(self, filename):
# Line 91  class ProjFile: Line 123  class ProjFile:
123          self.SetFilename(filename)          self.SetFilename(filename)
124            
125      def Add(self, proj):      def Add(self, proj):
126          """Add the given projection to the end of the file. If 'proj'          """Add the projection to the end of the file."""
127          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)  
128    
129      def Remove(self, proj):      def Remove(self, proj):
130          """Remove the object proj from the projection file.          """Remove the object proj from the projection file.
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