/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1219 by bh, Mon Jun 16 17:42:54 2003 UTC revision 1452 by bh, Fri Jul 18 12:57:59 2003 UTC
# Line 15  from Thuban import _ Line 15  from Thuban import _
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
18       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
19    
20  import classification  import classification
21    
22  from color import Color  from color import Transparent, Black
23  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
24    
25  import resource  import resource
# Line 99  class BaseLayer(TitledObject, Modifiable Line 99  class BaseLayer(TitledObject, Modifiable
99          """Determine if this layer support classifications."""          """Determine if this layer support classifications."""
100          return False          return False
101    
102        def HasShapes(self):
103            """Determine if this layer supports shapes."""
104            return False
105    
106      def GetProjection(self):      def GetProjection(self):
107          """Return the layer's projection."""          """Return the layer's projection."""
108          return self.projection          return self.projection
# Line 115  class Layer(BaseLayer): Line 119  class Layer(BaseLayer):
119      All children of the layer have the same type.      All children of the layer have the same type.
120    
121      A layer has fill and stroke colors. Colors should be instances of      A layer has fill and stroke colors. Colors should be instances of
122      Color. They can also be None, indicating no fill or no stroke.      Color. They can also be Transparent, indicating no fill or no stroke.
123    
124      The layer objects send the following events, all of which have the      The layer objects send the following events, all of which have the
125      layer object as parameter:      layer object as parameter:
# Line 125  class Layer(BaseLayer): Line 129  class Layer(BaseLayer):
129      """      """
130    
131      def __init__(self, title, data, projection = None,      def __init__(self, title, data, projection = None,
132                   fill = Color.Transparent,                   fill = Transparent,
133                   stroke = Color.Black,                   stroke = Black,
134                   lineWidth = 1,                   lineWidth = 1,
135                   visible = True):                   visible = True):
136          """Initialize the layer.          """Initialize the layer.
# Line 136  class Layer(BaseLayer): Line 140  class Layer(BaseLayer):
140          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
141                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
142                 coordinates                 coordinates
143          fill -- the fill color or Color.Transparent if the shapes are          fill -- the fill color or Transparent if the shapes are
144                  not filled                  not filled
145          stroke -- the stroke color or Color.Transparent if the shapes          stroke -- the stroke color or Transparent if the shapes
146                  are not stroked                  are not stroked
147          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
148    
# Line 148  class Layer(BaseLayer): Line 152  class Layer(BaseLayer):
152                                   visible = visible,                                   visible = visible,
153                                   projection = projection)                                   projection = projection)
154    
         #  
         # this is really important so that when the classification class  
         # tries to set its parent layer the variable will exist  
         #  
155          self.__classification = None          self.__classification = None
156          self.__setClassLock = False          self.store = None
157    
158          self.SetShapeStore(data)          self.SetShapeStore(data)
159    
160            self.classification_column = None
161            self.SetClassificationColumn(None)
162          self.SetClassification(None)          self.SetClassification(None)
163    
164          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
165          self.__classification.SetDefaultLineWidth(lineWidth)          self.__classification.SetDefaultLineWidth(lineWidth)
166          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
         self.__classification.SetLayer(self)  
167    
168          self.UnsetModified()          self.UnsetModified()
169    
# Line 188  class Layer(BaseLayer): Line 189  class Layer(BaseLayer):
189          return value          return value
190    
191      def SetShapeStore(self, store):      def SetShapeStore(self, store):
192            # Set the classification to None if there is a classification
193            # and the new shapestore doesn't have a table with a suitable
194            # column, i.e one with the same name and type as before
195            # FIXME: Maybe we should keep it the same if the type is
196            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
197            if self.__classification is not None:
198                columnname = self.classification_column
199                columntype = self.GetFieldType(columnname)
200                table = store.Table()
201                if (columnname is not None
202                    and (not table.HasColumn(columnname)
203                         or table.Column(columnname).type != columntype)):
204                    self.SetClassification(None)
205    
206          self.store = store          self.store = store
207          shapefile = self.store.Shapefile()          shapefile = self.store.Shapefile()
208    
# Line 213  class Layer(BaseLayer): Line 228  class Layer(BaseLayer):
228    
229          self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,          self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,
230                                           maxdepth)                                           maxdepth)
         # Set the classification to None if there is a classification  
         # and the new shapestore doesn't have a table with a suitable  
         # column, i.e one with the same name and type as before  
         # FIXME: Maybe we should keep it the same if the type is  
         # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT  
         if self.__classification is not None:  
             fieldname = self.__classification.GetField()  
             fieldtype = self.__classification.GetFieldType()  
             table = self.store.Table()  
             if (fieldname is not None  
                 and (not table.HasColumn(fieldname)  
                      or table.Column(fieldname).type != fieldtype)):  
                 self.SetClassification(None)  
231          self.changed(LAYER_SHAPESTORE_REPLACED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
232    
233      def ShapeStore(self):      def ShapeStore(self):
# Line 233  class Layer(BaseLayer): Line 235  class Layer(BaseLayer):
235    
236      def Destroy(self):      def Destroy(self):
237          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
238          self.SetClassification(None)          if self.__classification is not None:
239                self.__classification.Unsubscribe(CLASS_CHANGED,
240                                                  self._classification_changed)
241    
242      def BoundingBox(self):      def BoundingBox(self):
243          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
# Line 290  class Layer(BaseLayer): Line 294  class Layer(BaseLayer):
294          return (min(llx), min(lly), max(urx), max(ury))          return (min(llx), min(lly), max(urx), max(ury))
295    
296      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
297          table = self.store.Table()          if self.store:
298          if table.HasColumn(fieldName):              table = self.store.Table()
299              return table.Column(fieldName).type              if table.HasColumn(fieldName):
300                    return table.Column(fieldName).type
301          return None          return None
302    
303        def HasShapes(self):
304            return True
305    
306      def NumShapes(self):      def NumShapes(self):
307          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
308          return self.numshapes          return self.numshapes
# Line 333  class Layer(BaseLayer): Line 341  class Layer(BaseLayer):
341    
342          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
343    
344        def GetClassificationColumn(self):
345            return self.classification_column
346    
347        def SetClassificationColumn(self, column):
348            """Set the column to classifiy on, or None. If column is not None
349            and the column does not exist in the table, raise a ValueError.
350            """
351            if column:
352                columnType = self.GetFieldType(column)
353                if columnType is None:
354                    raise ValueError()
355            changed = self.classification_column != column
356            self.classification_column = column
357            if changed:
358                self.changed(LAYER_CHANGED, self)
359    
360      def HasClassification(self):      def HasClassification(self):
361          return True          return True
362    
# Line 340  class Layer(BaseLayer): Line 364  class Layer(BaseLayer):
364          return self.__classification          return self.__classification
365    
366      def SetClassification(self, clazz):      def SetClassification(self, clazz):
367          """Set the classification to 'clazz'          """Set the classification used by this layer to 'clazz'
368    
369          If 'clazz' is None a default classification is created          If 'clazz' is None a default classification is created.
         """  
370    
371          # prevent infinite recursion when calling SetLayer()          This issues a LAYER_CHANGED event.
372          if self.__setClassLock: return          """
373    
374          self.__setClassLock = True          if self.__classification is not None:
375                self.__classification.Unsubscribe(CLASS_CHANGED,
376                                                  self._classification_changed)
377    
378          if clazz is None:          if clazz is None:
379              if self.__classification is not None:              clazz = classification.Classification()
                 self.__classification.SetLayer(None)  
             self.__classification = classification.Classification()  
         else:  
             self.__classification = clazz  
             try:  
                 self.__classification.SetLayer(self)  
             except ValueError:  
                 self.__setClassLock = False  
                 raise ValueError  
380    
381          self.changed(LAYER_CHANGED, self)          self.__classification = clazz
382            self.__classification.Subscribe(CLASS_CHANGED,
383                                            self._classification_changed)
384    
385          self.__setClassLock = False          self._classification_changed()
386    
387      def ClassChanged(self):      def _classification_changed(self):
388          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
389          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_CHANGED, self)
390    
391      def TreeInfo(self):      def TreeInfo(self):
392          items = []          items = []
393    
394          if hasattr(self, 'filename'):          items.append(_("Filename: %s") % self.ShapeStore().FileName())
             items.append(_("Filename: %s") % self.filename)  
395    
396          if self.Visible():          if self.Visible():
397              items.append(_("Shown"))              items.append(_("Shown"))
# Line 441  class RasterLayer(BaseLayer): Line 458  class RasterLayer(BaseLayer):
458      def BoundingBox(self):      def BoundingBox(self):
459          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
460    
461          If the layer has no shapes, return None.          If the there is no support for images, or the file cannot
462            be read, or there is no geographics information available, return None.
463          """          """
464          if not resource.has_gdal_support():          if not resource.has_gdal_support():
465              return None              return None
# Line 497  class RasterLayer(BaseLayer): Line 515  class RasterLayer(BaseLayer):
515      def TreeInfo(self):      def TreeInfo(self):
516          items = []          items = []
517    
518            items.append(_("Filename: %s") % self.GetImageFilename())
519    
520          if self.Visible():          if self.Visible():
521              items.append(_("Shown"))              items.append(_("Shown"))
522          else:          else:
523              items.append(_("Hidden"))              items.append(_("Hidden"))
         items.append(_("Shapes: %d") % self.NumShapes())  
524    
525          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
526          if bbox is not None:          if bbox is not None:
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