/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classification.py
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revision 609 by jonathan, Fri Apr 4 13:55:59 2003 UTC revision 613 by jonathan, Mon Apr 7 08:55:55 2003 UTC
# Line 16  an input value falls with a range that d Line 16  an input value falls with a range that d
16  If no mapping can be found then default data will  If no mapping can be found then default data will
17  be returned. Input values must be hashable objects  be returned. Input values must be hashable objects
18    
19  See the description of GetGroup() for more information  See the description of FindGroup() for more information
20  on the mapping algorithm.  on the mapping algorithm.
21  """  """
22        
# Line 25  from __future__ import nested_scopes Line 25  from __future__ import nested_scopes
25    
26  import copy  import copy
27    
28    from Thuban import _
29    
30  from types import *  from types import *
31    
32  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from messages import \
33       LAYER_VISIBILITY_CHANGED      LAYER_PROJECTION_CHANGED, \
34        LAYER_LEGEND_CHANGED, \
35        LAYER_VISIBILITY_CHANGED
36    
 from Thuban import _  
37  from Thuban.Model.color import Color  from Thuban.Model.color import Color
38    
39  import Thuban.Model.layer  import Thuban.Model.layer
40    
 # constants  
 RANGE_MIN  = 0  
 RANGE_MAX  = 1  
 RANGE_DATA = 2  
   
41  class Classification:  class Classification:
42      """Encapsulates the classification of layer. The Classification      """Encapsulates the classification of layer.
43      divides some kind of data into Groups which are associated with      
44      properties. Later the properties can be retrieved by matching      The Classification divides some kind of data into Groups which
45      data values to the appropriate group."""      are associated with properties. Later the properties can be
46        retrieved by matching data values to the appropriate group.
47        """
48    
49      def __init__(self, layer = None, field = None):      def __init__(self, layer = None, field = None):
50          """Initialize a classification.          """Initialize a classification.
51    
52             layer -- the Layer object who owns this classification          layer -- the Layer object who owns this classification
53    
54             field -- the name of the data table field that          field -- the name of the data table field that
55                      is to be used to classify layer properties                   is to be used to classify layer properties
56          """          """
57    
58          self.layer = None          self.layer = None
59          self.field = None          self.field = None
60          self.fieldType = None          self.fieldType = None
61          self.groups = []          self.__groups = []
62    
63          self.__setLayerLock = False          self.__setLayerLock = False
64    
# Line 68  class Classification: Line 68  class Classification:
68          self.SetField(field)          self.SetField(field)
69    
70      def __iter__(self):      def __iter__(self):
71          return ClassIterator(self.groups)          return ClassIterator(self.__groups)
72    
73        def __deepcopy__(self, memo):
74            clazz = Classification()
75    
76            clazz.__groups[0] = copy.deepcopy(self.__groups[0])
77    
78            for i in range(1, len(self.__groups)):
79                clazz.__groups.append(copy.deepcopy(self.__groups[i]))
80    
81            print "Classification.__deepcopy__"
82            return clazz
83    
84      def __SendNotification(self):      def __SendNotification(self):
85          """Notify the layer that this class has changed."""          """Notify the layer that this class has changed."""
# Line 78  class Classification: Line 89  class Classification:
89      def SetField(self, field):      def SetField(self, field):
90          """Set the name of the data table field to use.          """Set the name of the data table field to use.
91                    
92             If there is no layer then the field type is set to None,          If there is no layer then the field type is set to None,
93             otherwise the layer is queried to find the type of the          otherwise the layer is queried to find the type of the
94             field data          field data
95    
96             field -- if None then all values map to the default data          field -- if None then all values map to the default data
97          """          """
98    
99          if field == "":          if field == "":
# Line 135  class Classification: Line 146  class Classification:
146      def SetLayer(self, layer):      def SetLayer(self, layer):
147          """Set the owning Layer of this classification.          """Set the owning Layer of this classification.
148    
149             A ValueError exception will be thrown either the field or          A ValueError exception will be thrown either the field or
150             field type mismatch the information in the layer's table.          field type mismatch the information in the layer's table.
151          """          """
152    
153          # prevent infinite recursion when calling SetClassification()          # prevent infinite recursion when calling SetClassification()
# Line 171  class Classification: Line 182  class Classification:
182          """Return the parent layer."""          """Return the parent layer."""
183          return self.layer          return self.layer
184    
     def SetDefaultGroup(self, group):  
         """Set the group to be used when a value can't be classified.  
   
            group -- group that the value maps to.  
         """  
   
         assert isinstance(group, ClassGroupDefault)  
         self.AddGroup(group)  
   
     def GetDefaultGroup(self):  
         """Return the default group."""  
         return self.groups[0]  
185    
186      #      #
187      # these SetDefault* methods are really only provided for      # these SetDefault* methods are really only provided for
# Line 229  class Classification: Line 228  class Classification:
228          """Return the default line width."""          """Return the default line width."""
229          return self.GetDefaultGroup().GetProperties().GetLineWidth()          return self.GetDefaultGroup().GetProperties().GetLineWidth()
230                    
231      def AddGroup(self, item):  
232          """Add a new ClassGroup item to the classification.      #
233        # The methods that manipulate self.__groups have to be kept in
234        # sync. We store the default group in index 0 to make it
235        # convienent to iterate over the classification's groups, but
236        # from the user's perspective the first (non-default) group is
237        # at index 0 and the DefaultGroup is a special entity.
238        #
239    
240        def SetDefaultGroup(self, group):
241            """Set the group to be used when a value can't be classified.
242    
243            group -- group that the value maps to.
244            """
245    
246            assert isinstance(group, ClassGroupDefault)
247            if len(self.__groups) > 0:
248                self.__groups[0] = group
249            else:
250                self.__groups.append(group)
251    
252        def GetDefaultGroup(self):
253            """Return the default group."""
254            return self.__groups[0]
255    
256        def AppendGroup(self, item):
257            """Append a new ClassGroup item to the classification.
258    
259          item -- this must be a valid ClassGroup object          item -- this must be a valid ClassGroup object
260          """          """
261    
262          assert isinstance(item, ClassGroup)          self.InsertGroup(self.GetNumGroups(), item)
263    
264          if len(self.groups) > 0 and isinstance(item, ClassGroupDefault):      def InsertGroup(self, index, group):
265              self.groups[0] = item          
266          else:          assert isinstance(group, ClassGroup)
267              self.groups.append(item)  
268            self.__groups.insert(index + 1, group)
269    
270            self.__SendNotification()
271    
272        def RemoveGroup(self, index):
273            return self.__groups.pop(index + 1)
274    
275        def ReplaceGroup(self, index, group):
276            assert isinstance(group, ClassGroup)
277    
278            self.__groups[index + 1] = group
279    
280          self.__SendNotification()          self.__SendNotification()
281    
282      def GetGroup(self, value):      def GetGroup(self, index):
283            return self.__groups[index + 1]
284    
285        def GetNumGroups(self):
286            """Return the number of non-default groups in the classification."""
287            return len(self.__groups) - 1
288    
289    
290        def FindGroup(self, value):
291          """Return the associated group, or the default group.          """Return the associated group, or the default group.
292    
293             Groups are checked in the order the were added to the          Groups are checked in the order the were added to the
294             Classification.          Classification.
295    
296             value -- the value to classify. If there is no mapping,          value -- the value to classify. If there is no mapping,
297                      the field is None or value is None,                   the field is None or value is None,
298                      return the default properties                   return the default properties
299          """          """
300    
301          if self.GetField() is not None and value is not None:          if self.GetField() is not None and value is not None:
302    
303              for i in range(1, len(self.groups)):              for i in range(1, len(self.__groups)):
304                  group = self.groups[i]                  group = self.__groups[i]
305                  if group.Matches(value):                  if group.Matches(value):
306                      return group                      return group
307    
308          return self.GetDefaultGroup()          return self.GetDefaultGroup()
309    
310      def GetProperties(self, value):      def GetProperties(self, value):
311          """Return the properties associated with the given value."""          """Return the properties associated with the given value.
312          
313            Use this function rather than Classification.FindGroup().GetProperties()
314            since the returned group may be a ClassGroupMap which doesn't support
315            a call to GetProperties().
316            """
317    
318          group = self.GetGroup(value)          group = self.FindGroup(value)
319          if isinstance(group, ClassGroupMap):          if isinstance(group, ClassGroupMap):
320              return group.GetPropertiesFromValue(value)              return group.GetPropertiesFromValue(value)
321          else:          else:
# Line 302  class Classification: Line 350  class Classification:
350              return (label, i)              return (label, i)
351    
352          for p in self:          for p in self:
353              if isinstance(p, ClassGroupDefault):              items.append(build_item(p, p.GetDisplayText()))
354                  items.append(build_item(self.GetDefaultGroup(), _("'DEFAULT'")))  
355              elif isinstance(p, ClassGroupSingleton):  #           if isinstance(p, ClassGroupDefault):
356                  items.append(build_item(p, str(p.GetValue())))  #               items.append(build_item(self.GetDefaultGroup(), _("'DEFAULT'")))
357              elif isinstance(p, ClassGroupRange):  #           elif isinstance(p, ClassGroupSingleton):
358                  items.append(build_item(p, "%s - %s" %  #               items.append(build_item(p, str(p.GetValue())))
359                                             (p.GetMin(), p.GetMax())))  #           elif isinstance(p, ClassGroupRange):
360    #               items.append(build_item(p, "%s - %s" %
361    #                                          (p.GetMin(), p.GetMax())))
362    
363          return (_("Classification"), items)          return (_("Classification"), items)
364    
# Line 624  class ClassGroupDefault(ClassGroup): Line 674  class ClassGroupDefault(ClassGroup):
674    
675          if label != "": return label          if label != "": return label
676    
677          return "DEFAULT"          return _("DEFAULT")
678    
679      def __eq__(self, other):      def __eq__(self, other):
680          return isinstance(other, ClassGroupDefault) \          return isinstance(other, ClassGroupDefault) \
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