/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1088 by bh, Wed May 28 12:42:23 2003 UTC revision 1273 by jonathan, Fri Jun 20 17:45:49 2003 UTC
# Line 9  Line 9 
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
11  from math import log, ceil  from math import log, ceil
12    import warnings
13    
14  from Thuban import _  from Thuban import _
   
15  import shapelib, shptree  import shapelib, shptree
16    
 import gdal  
 from gdalconst import GA_ReadOnly  
   
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
18       LAYER_CHANGED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED
   
 from color import Color  
19    
20  import classification  import classification
21    
22    from color import Color
23  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
24    
25    import resource
26    
27    
28  class Shape:  class Shape:
29    
# Line 101  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 168  class Layer(BaseLayer): Line 170  class Layer(BaseLayer):
170    
171          self.UnsetModified()          self.UnsetModified()
172    
173        def __getattr__(self, attr):
174            """Access to some attributes for backwards compatibility
175    
176            The attributes implemented here are now held by the shapestore
177            if at all. For backwards compatibility pretend that they are
178            still there but issue a DeprecationWarning when they are
179            accessed.
180            """
181            if attr in ("table", "shapetable"):
182                value = self.store.Table()
183            elif attr == "shapefile":
184                value = self.store.Shapefile()
185            elif attr == "filename":
186                value = self.store.FileName()
187            else:
188                raise AttributeError, attr
189            warnings.warn("The Layer attribute %r is deprecated."
190                          " It's value can be accessed through the shapestore"
191                          % attr, DeprecationWarning, stacklevel = 2)
192            return value
193    
194      def SetShapeStore(self, store):      def SetShapeStore(self, store):
195          self.store = store          self.store = store
196          self.shapefile = self.store.Shapefile()          shapefile = self.store.Shapefile()
         self.shapetable = self.store.Table()  
         if hasattr(self.store, "FileName"):  
             self.filename = self.store.FileName()  
         self.table = self.shapetable  
197    
198          numshapes, shapetype, mins, maxs = self.shapefile.info()          numshapes, shapetype, mins, maxs = shapefile.info()
199          self.numshapes = numshapes          self.numshapes = numshapes
200          self.shapetype = shapelib_shapetypes[shapetype]          self.shapetype = shapelib_shapetypes[shapetype]
201    
# Line 197  class Layer(BaseLayer): Line 215  class Layer(BaseLayer):
215          else:          else:
216              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
217    
218          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,          self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,
219                                           maxdepth)                                           maxdepth)
220          # Set the classification to None if there is a classification          # Set the classification to None if there is a classification
221          # and the new shapestore doesn't have a table with a suitable          # and the new shapestore doesn't have a table with a suitable
# Line 212  class Layer(BaseLayer): Line 230  class Layer(BaseLayer):
230                  and (not table.HasColumn(fieldname)                  and (not table.HasColumn(fieldname)
231                       or table.Column(fieldname).type != fieldtype)):                       or table.Column(fieldname).type != fieldtype)):
232                  self.SetClassification(None)                  self.SetClassification(None)
233          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
234    
235      def ShapeStore(self):      def ShapeStore(self):
236          return self.store          return self.store
# Line 276  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          if self.table.HasColumn(fieldName):          table = self.store.Table()
298              return self.table.Column(fieldName).type          if table.HasColumn(fieldName):
299                return table.Column(fieldName).type
300          return None          return None
301    
302        def HasShapes(self):
303            return True
304    
305      def NumShapes(self):      def NumShapes(self):
306          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
307          return self.numshapes          return self.numshapes
# Line 292  class Layer(BaseLayer): Line 314  class Layer(BaseLayer):
314    
315      def Shape(self, index):      def Shape(self, index):
316          """Return the shape with index index"""          """Return the shape with index index"""
317          shape = self.shapefile.read_object(index)          shape = self.store.Shapefile().read_object(index)
318    
319          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
320              points = shape.vertices()              points = shape.vertices()
# Line 383  class Layer(BaseLayer): Line 405  class Layer(BaseLayer):
405          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
406    
407    
408    if resource.has_gdal_support():
409        import gdal
410        from gdalconst import GA_ReadOnly
411    
412  class RasterLayer(BaseLayer):  class RasterLayer(BaseLayer):
413    
414      def __init__(self, title, filename, projection = None, visible = True):      def __init__(self, title, filename, projection = None, visible = True):
# Line 408  class RasterLayer(BaseLayer): Line 434  class RasterLayer(BaseLayer):
434    
435          self.bbox = -1          self.bbox = -1
436    
437          #          if resource.has_gdal_support():
438          # temporarily open the file so that GDAL can test if it's valid.              #
439          #              # temporarily open the file so that GDAL can test if it's valid.
440          dataset = gdal.Open(self.filename, GA_ReadOnly)              #
441                dataset = gdal.Open(self.filename, GA_ReadOnly)
442    
443          if dataset is None:              if dataset is None:
444              raise IOError()                  raise IOError()
445    
446          self.UnsetModified()          self.UnsetModified()
447    
# Line 423  class RasterLayer(BaseLayer): Line 450  class RasterLayer(BaseLayer):
450    
451          If the layer has no shapes, return None.          If the layer has no shapes, return None.
452          """          """
453            if not resource.has_gdal_support():
454                return None
455    
456          if self.bbox == -1:          if self.bbox == -1:
457              dataset = gdal.Open(self.filename, GA_ReadOnly)              dataset = gdal.Open(self.filename, GA_ReadOnly)
458              if dataset is None:              if dataset is None:
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