/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classification.py
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revision 462 by jonathan, Wed Mar 5 18:17:17 2003 UTC revision 544 by jonathan, Thu Mar 20 09:43:48 2003 UTC
# Line 23  on the mapping algorithm. Line 23  on the mapping algorithm.
23  # fix for people using python2.1  # fix for people using python2.1
24  from __future__ import nested_scopes  from __future__ import nested_scopes
25    
26    import copy
27    
28  from types import *  from types import *
29    
30  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \
# Line 33  from Thuban.Model.color import Color Line 35  from Thuban.Model.color import Color
35    
36  import Thuban.Model.layer  import Thuban.Model.layer
37    
   
38  # constants  # constants
39  RANGE_MIN  = 0  RANGE_MIN  = 0
40  RANGE_MAX  = 1  RANGE_MAX  = 1
# Line 58  class Classification: Line 59  class Classification:
59          self.field = None          self.field = None
60          self.fieldType = None          self.fieldType = None
61          self.groups = []          self.groups = []
         self.__sendMessages = False  
62    
63          self.__ToggleMessages(False)          self.__setLayerLock = False
64    
65          self.SetDefaultGroup(ClassGroupDefault())          self.SetDefaultGroup(ClassGroupDefault())
66    
67          self.SetLayer(layer)          self.SetLayer(layer)
68          self.SetField(field)          self.SetField(field)
69    
         self.__ToggleMessages(True)  
   
70      def __iter__(self):      def __iter__(self):
71          return ClassIterator(self.groups)          return ClassIterator(self.groups)
72    
73      def __ToggleMessages(self, on):      def __SendNotification(self):
74          self.__sendMessages = on          """Notify the layer that this class has changed."""
75            if self.layer is not None:
76      def __SendMessage(self, message):              self.layer.ClassChanged()
         """Send the message 'message' to the parent layer."""  
         if self.__sendMessages and self.layer is not None:  
             self.layer.changed(message, self.layer)  
77            
78      def SetField(self, field = None):      def SetField(self, field):
79          """Set the name of the data table field to use.          """Set the name of the data table field to use.
80                    
81               If there is no layer then the field type is set to None,
82               otherwise the layer is queried to find the type of the
83               field data
84    
85             field -- if None then all values map to the default data             field -- if None then all values map to the default data
86          """          """
87    
88          if field == "":          if field == "":
89              field = None              field = None
90    
         self.field = field  
91    
92          if self.layer is not None:          if field is None:
93              fieldType = self.layer.GetFieldType(field)              if self.layer is not None:
94                    self.fieldType = None
95          else:          else:
96              fieldType = None              if self.layer is not None:
97                    fieldType = self.layer.GetFieldType(field)
98                    if fieldType is None:
99                        raise ValueError("'%s' was not found in the layer's table."
100                                         % self.field)
101    
102                    #
103                    # unfortunately we cannot call SetFieldType() because it
104                    # requires the layer to be None
105                    #
106                    self.fieldType = fieldType
107                    #self.SetFieldType(fieldType)
108    
109          self.SetFieldType(fieldType)          self.field = field
   
         # XXX: if fieldType comes back None then field isn't in the table!  
110    
111          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
112    
113      def GetField(self):      def GetField(self):
114          """Return the name of the field."""          """Return the name of the field."""
# Line 109  class Classification: Line 119  class Classification:
119          return self.fieldType          return self.fieldType
120    
121      def SetFieldType(self, type):      def SetFieldType(self, type):
122          self.fieldType = type          """Set the type of the field used by this classification.
123    
124            A ValueError is raised if the owning layer is not None and
125            'type' is different from the current field type.
126            """
127    
128            if type != self.fieldType:
129                if self.layer is not None:
130                    raise ValueError()
131                else:
132                    self.fieldType = type
133                    self.__SendNotification()
134    
135      def SetLayer(self, layer):      def SetLayer(self, layer):
136          """Set the owning Layer of this classification."""          """Set the owning Layer of this classification.
137    
138               A ValueError exception will be thrown either the field or
139               field type mismatch the information in the layer's table.
140            """
141    
142            # prevent infinite recursion when calling SetClassification()
143            if self.__setLayerLock: return
144    
145            self.__setLayerLock = True
146    
147          if __debug__:          if layer is None:
148              if layer is not None:              if self.layer is not None:
149                  assert(isinstance(layer, Thuban.Model.layer.Layer))                  l = self.layer
150                    self.layer = None
151                    l.SetClassification(None)
152            else:
153                assert(isinstance(layer, Thuban.Model.layer.Layer))
154    
155                old_layer = self.layer
156    
157          self.layer = layer              self.layer = layer
158          self.SetField(self.GetField()) # XXX: this sync's the fieldType  
159                try:
160                    self.SetField(self.GetField()) # this sync's the fieldType
161                except ValueError:
162                    self.layer = old_layer
163                    self.__setLayerLock = False
164                    raise ValueError
165                else:
166                    self.layer.SetClassification(self)
167    
168          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__setLayerLock = False
169    
170      def GetLayer(self):      def GetLayer(self):
171          """Return the parent layer."""          """Return the parent layer."""
# Line 153  class Classification: Line 197  class Classification:
197          """          """
198          assert(isinstance(fill, Color))          assert(isinstance(fill, Color))
199          self.GetDefaultGroup().GetProperties().SetFill(fill)          self.GetDefaultGroup().GetProperties().SetFill(fill)
200          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
201                    
202      def GetDefaultFill(self):      def GetDefaultFill(self):
203          """Return the default fill color."""          """Return the default fill color."""
# Line 166  class Classification: Line 210  class Classification:
210          """          """
211          assert(isinstance(color, Color))          assert(isinstance(color, Color))
212          self.GetDefaultGroup().GetProperties().SetLineColor(color)          self.GetDefaultGroup().GetProperties().SetLineColor(color)
213          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
214                    
215      def GetDefaultLineColor(self):      def GetDefaultLineColor(self):
216          """Return the default line color."""          """Return the default line color."""
# Line 179  class Classification: Line 223  class Classification:
223          """          """
224          assert(isinstance(lineWidth, IntType))          assert(isinstance(lineWidth, IntType))
225          self.GetDefaultGroup().GetProperties().SetLineWidth(lineWidth)          self.GetDefaultGroup().GetProperties().SetLineWidth(lineWidth)
226          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
227                    
228      def GetDefaultLineWidth(self):      def GetDefaultLineWidth(self):
229          """Return the default line width."""          """Return the default line width."""
# Line 195  class Classification: Line 239  class Classification:
239    
240          if len(self.groups) > 0 and isinstance(item, ClassGroupDefault):          if len(self.groups) > 0 and isinstance(item, ClassGroupDefault):
241              self.groups[0] = item              self.groups[0] = item
             #self.SetDefaultGroup(item)  
242          else:          else:
243              self.groups.append(item)              self.groups.append(item)
244    
245          self.__SendMessage(LAYER_LEGEND_CHANGED)          self.__SendNotification()
246    
247      def GetGroup(self, value):      def GetGroup(self, value):
248          """Return the associated group, or the default group.          """Return the associated group, or the default group.
# Line 208  class Classification: Line 251  class Classification:
251             Classification.             Classification.
252    
253             value -- the value to classify. If there is no mapping,             value -- the value to classify. If there is no mapping,
254                      or value is None, return the default properties                      the field is None or value is None,
255                        return the default properties
256          """          """
257    
258          if self.field is not None and value is not None:          if self.GetField() is not None and value is not None:
259    
260              for i in range(1, len(self.groups)):              for i in range(1, len(self.groups)):
261                  group = self.groups[i]                  group = self.groups[i]
# Line 328  class ClassGroupProperties: Line 372  class ClassGroupProperties:
372    
373          props -- a ClassGroupProperties object. The class is copied if          props -- a ClassGroupProperties object. The class is copied if
374                   prop is not None. Otherwise, a default set of properties                   prop is not None. Otherwise, a default set of properties
375                   is created.                   is created such that: line color = Color.Black, line width = 1,
376                     and fill color = Color.None
377          """          """
378    
379          self.stroke = None          self.stroke = None
# Line 338  class ClassGroupProperties: Line 383  class ClassGroupProperties:
383          if props is not None:          if props is not None:
384              self.SetProperties(props)              self.SetProperties(props)
385          else:          else:
386              self.SetLineColor(Color.None)              self.SetLineColor(Color.Black)
387              self.SetLineWidth(1)              self.SetLineWidth(1)
388              self.SetFill(Color.None)              self.SetFill(Color.None)
389    
# Line 391  class ClassGroupProperties: Line 436  class ClassGroupProperties:
436          assert(isinstance(fill, Color))          assert(isinstance(fill, Color))
437          self.fill = fill          self.fill = fill
438    
439        def __eq__(self, other):
440            """Return true if 'props' has the same attributes as this class"""
441    
442            return isinstance(other, ClassGroupProperties)   \
443                and self.stroke      == other.GetLineColor() \
444                and self.strokeWidth == other.GetLineWidth() \
445                and self.fill        == other.GetFill()
446    
447        def __ne__(self, other):
448            return not self.__eq__(other)
449    
450        def __copy__(self):
451            return ClassGroupProperties(self)
452    
453  class ClassGroup:  class ClassGroup:
454      """A base class for all Groups within a Classification"""      """A base class for all Groups within a Classification"""
# Line 418  class ClassGroup: Line 476  class ClassGroup:
476          assert(isinstance(label, StringType))          assert(isinstance(label, StringType))
477          self.label = label          self.label = label
478    
479        def GetDisplayText(self):
480            assert(False, "GetDisplay must be overridden by subclass!")
481            return ""
482    
483      def Matches(self, value):      def Matches(self, value):
484          """Determines if this Group is associated with the given value.          """Determines if this Group is associated with the given value.
485    
486          Returns True or False. This needs to be implemented by all subclasses.          Returns False. This needs to be overridden by all subclasses.
487          """          """
488          pass          assert(False, "GetMatches must be overridden by subclass!")
489            return False
490    
491      def GetProperties(self):      def GetProperties(self):
492          """Return the properties associated with the given value.          """Return the properties associated with the given value.
493    
494          This needs to be implemented by all subclasses.          Returns None. This needs to be overridden by all subclasses.
495          """          """
496          pass          assert(False, "GetProperties must be overridden by subclass!")
497            return None
498    
499            
500  class ClassGroupSingleton(ClassGroup):  class ClassGroupSingleton(ClassGroup):
# Line 455  class ClassGroupSingleton(ClassGroup): Line 519  class ClassGroupSingleton(ClassGroup):
519          self.SetProperties(prop)          self.SetProperties(prop)
520    
521      def __copy__(self):      def __copy__(self):
522          return ClassGroupSingleton(self.value, self.prop, self.label)          return ClassGroupSingleton(self.GetValue(),
523                                       self.GetProperties(),
524                                       self.GetLabel())
525    
526        def __deepcopy__(self, memo):
527            return ClassGroupSingleton(copy.copy(self.GetValue()),
528                                       copy.copy(self.GetProperties()),
529                                       copy.copy(self.GetLabel()))
530    
531      def GetValue(self):      def GetValue(self):
532          """Return the associated value."""          """Return the associated value."""
# Line 488  class ClassGroupSingleton(ClassGroup): Line 559  class ClassGroupSingleton(ClassGroup):
559          assert(isinstance(prop, ClassGroupProperties))          assert(isinstance(prop, ClassGroupProperties))
560          self.prop = prop          self.prop = prop
561    
562        def GetDisplayText(self):
563            label = self.GetLabel()
564    
565  class ClassGroupDefault(ClassGroupSingleton):          if label != "": return label
566    
567            return str(self.GetValue())
568    
569        def __eq__(self, other):
570            return isinstance(other, ClassGroupSingleton) \
571                and self.GetProperties() == other.GetProperties() \
572                and self.GetValue() == other.GetValue()
573    
574        def __ne__(self, other):
575            return not self.__eq__(other)
576    
577    class ClassGroupDefault(ClassGroup):
578      """The default Group. When values do not match any other      """The default Group. When values do not match any other
579         Group within a Classification, the properties from this         Group within a Classification, the properties from this
580         class are used."""         class are used."""
# Line 503  class ClassGroupDefault(ClassGroupSingle Line 588  class ClassGroupDefault(ClassGroupSingle
588          label -- a label for this group.          label -- a label for this group.
589          """          """
590    
591          ClassGroupSingleton.__init__(self, 0, prop, label)          ClassGroup.__init__(self, label)
592            self.SetProperties(prop)
593    
594      def __copy__(self):      def __copy__(self):
595          return ClassGroupDefault(self.prop, self.label)          return ClassGroupDefault(self.GetProperties(), self.GetLabel())
596    
597        def __deepcopy__(self, memo):
598            return ClassGroupDefault(copy.copy(self.GetProperties()),
599                                     copy.copy(self.GetLabel()))
600    
601        def Matches(self, value):
602            return True
603    
604      def GetProperties(self):      def GetProperties(self):
605          """Return the Properties associated with this Group."""          """Return the Properties associated with this Group."""
606          return self.prop          return self.prop
607    
608        def SetProperties(self, prop):
609            """Set the properties associated with this Group.
610    
611            prop -- a ClassGroupProperties object. if prop is None,
612                    a default set of properties is created.
613            """
614    
615            if prop is None: prop = ClassGroupProperties()
616            assert(isinstance(prop, ClassGroupProperties))
617            self.prop = prop
618    
619        def GetDisplayText(self):
620            label = self.GetLabel()
621    
622            if label != "": return label
623    
624            return "DEFAULT"
625    
626        def __eq__(self, other):
627            return isinstance(other, ClassGroupDefault) \
628                and self.GetProperties() == other.GetProperties()
629    
630        def __ne__(self, other):
631            return not self.__eq__(other)
632    
633  class ClassGroupRange(ClassGroup):  class ClassGroupRange(ClassGroup):
634      """A Group that represents a range of values that map to the same      """A Group that represents a range of values that map to the same
635         set of properties."""         set of properties."""
# Line 540  class ClassGroupRange(ClassGroup): Line 658  class ClassGroupRange(ClassGroup):
658          self.SetProperties(prop)          self.SetProperties(prop)
659    
660      def __copy__(self):      def __copy__(self):
661          return ClassGroupRange(self.min, self.max, self.prop, self.label)          return ClassGroupRange(self.GetMin(),
662                                   self.GetMax(),
663                                   self.GetProperties(),
664                                   self.GetLabel())
665    
666        def __deepcopy__(self, memo):
667            return ClassGroupRange(copy.copy(self.GetMin()),
668                                   copy.copy(self.GetMax()),
669                                   copy.copy(self.GetProperties()),
670                                   copy.copy(self.GetLabel()))
671    
672      def GetMin(self):      def GetMin(self):
673          """Return the range's minimum value."""          """Return the range's minimum value."""
# Line 608  class ClassGroupRange(ClassGroup): Line 735  class ClassGroupRange(ClassGroup):
735          assert(isinstance(prop, ClassGroupProperties))          assert(isinstance(prop, ClassGroupProperties))
736          self.prop = prop          self.prop = prop
737    
738        def GetDisplayText(self):
739            label = self.GetLabel()
740    
741            if label != "": return label
742    
743            return _("%s - %s") % (self.GetMin(), self.GetMax())
744    
745        def __eq__(self, other):
746            return isinstance(other, ClassGroupRange) \
747                and self.GetProperties() == other.GetProperties() \
748                and self.GetRange() == other.GetRange()
749    
750        def __ne__(self, other):
751            return not self.__eq__(other)
752    
753  class ClassGroupMap(ClassGroup):  class ClassGroupMap(ClassGroup):
754      """Currently, this class is not used."""      """Currently, this class is not used."""
755    
# Line 631  class ClassGroupMap(ClassGroup): Line 773  class ClassGroupMap(ClassGroup):
773      def GetPropertiesFromValue(self, value):      def GetPropertiesFromValue(self, value):
774          pass          pass
775    
776        def GetDisplayText(self):
777            return "Map: " + self.map_type
778    
779      #      #
780      # built-in mappings      # built-in mappings
781      #      #
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