/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 929 by jonathan, Tue May 20 15:22:42 2003 UTC revision 1355 by jonathan, Wed Jul 2 09:37:23 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 Transparent, Black
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 117  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 127  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 138  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 155  class Layer(BaseLayer): Line 157  class Layer(BaseLayer):
157          # tries to set its parent layer the variable will exist          # tries to set its parent layer the variable will exist
158          #          #
159          self.__classification = None          self.__classification = None
         self.__setClassLock = False  
160    
161          self.SetShapeStore(data)          self.SetShapeStore(data)
162    
# Line 164  class Layer(BaseLayer): Line 165  class Layer(BaseLayer):
165          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
166          self.__classification.SetDefaultLineWidth(lineWidth)          self.__classification.SetDefaultLineWidth(lineWidth)
167          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
         self.__classification.SetLayer(self)  
168    
169          self.UnsetModified()          self.UnsetModified()
170    
171        def __getattr__(self, attr):
172            """Access to some attributes for backwards compatibility
173    
174            The attributes implemented here are now held by the shapestore
175            if at all. For backwards compatibility pretend that they are
176            still there but issue a DeprecationWarning when they are
177            accessed.
178            """
179            if attr in ("table", "shapetable"):
180                value = self.store.Table()
181            elif attr == "shapefile":
182                value = self.store.Shapefile()
183            elif attr == "filename":
184                value = self.store.FileName()
185            else:
186                raise AttributeError, attr
187            warnings.warn("The Layer attribute %r is deprecated."
188                          " It's value can be accessed through the shapestore"
189                          % attr, DeprecationWarning, stacklevel = 2)
190            return value
191    
192      def SetShapeStore(self, store):      def SetShapeStore(self, store):
193          self.store = store          self.store = store
194          self.shapefile = self.store.Shapefile()          shapefile = self.store.Shapefile()
         self.shapetable = self.store.Table()  
         self.filename = self.store.filename  
         self.table = self.shapetable  
195    
196          numshapes, shapetype, mins, maxs = self.shapefile.info()          numshapes, shapetype, mins, maxs = shapefile.info()
197          self.numshapes = numshapes          self.numshapes = numshapes
198          self.shapetype = shapelib_shapetypes[shapetype]          self.shapetype = shapelib_shapetypes[shapetype]
199    
# Line 196  class Layer(BaseLayer): Line 213  class Layer(BaseLayer):
213          else:          else:
214              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
215    
216          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,          self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,
217                                           maxdepth)                                           maxdepth)
218            # Set the classification to None if there is a classification
219            # and the new shapestore doesn't have a table with a suitable
220            # column, i.e one with the same name and type as before
221            # FIXME: Maybe we should keep it the same if the type is
222            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
223          if self.__classification is not None:          if self.__classification is not None:
224              fieldname = self.__classification.GetField()              fieldname = self.__classification.GetField()
225              if fieldname is not None and \              fieldtype = self.__classification.GetFieldType()
226                 not self.store.Table().HasColumn(fieldname):              table = self.store.Table()
227                if (fieldname is not None
228                    and (not table.HasColumn(fieldname)
229                         or table.Column(fieldname).type != fieldtype)):
230                  self.SetClassification(None)                  self.SetClassification(None)
231          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
232    
233      def ShapeStore(self):      def ShapeStore(self):
234          return self.store          return self.store
235    
236      def Destroy(self):      def Destroy(self):
237          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
238          self.SetClassification(None)          self.GetClassification()._set_layer(None)
239    
240      def BoundingBox(self):      def BoundingBox(self):
241          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
# Line 267  class Layer(BaseLayer): Line 292  class Layer(BaseLayer):
292          return (min(llx), min(lly), max(urx), max(ury))          return (min(llx), min(lly), max(urx), max(ury))
293    
294      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
295          if self.table.HasColumn(fieldName):          table = self.store.Table()
296              return self.table.Column(fieldName).type          if table.HasColumn(fieldName):
297                return table.Column(fieldName).type
298          return None          return None
299    
300        def HasShapes(self):
301            return True
302    
303      def NumShapes(self):      def NumShapes(self):
304          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
305          return self.numshapes          return self.numshapes
# Line 283  class Layer(BaseLayer): Line 312  class Layer(BaseLayer):
312    
313      def Shape(self, index):      def Shape(self, index):
314          """Return the shape with index index"""          """Return the shape with index index"""
315          shape = self.shapefile.read_object(index)          shape = self.store.Shapefile().read_object(index)
316    
317          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
318              points = shape.vertices()              points = shape.vertices()
# Line 316  class Layer(BaseLayer): Line 345  class Layer(BaseLayer):
345          return self.__classification          return self.__classification
346    
347      def SetClassification(self, clazz):      def SetClassification(self, clazz):
348          """Set the classification to 'clazz'          """Set the classification used by this layer to 'clazz'
349    
350          If 'clazz' is None a default classification is created          If 'clazz' is None a default classification is created.
         """  
351    
352          # prevent infinite recursion when calling SetLayer()          ValueError is raised if the classification's field name
353          if self.__setClassLock: return          and type are different (if they aren't None) than what
354            is in the shapestore. The Layer will not be changed in
355            this case.
356            """
357    
358          self.__setClassLock = True          old_class = self.__classification
359    
360          if clazz is None:          if clazz is None:
361              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  
362    
363          self.changed(LAYER_CHANGED, self)          try:
364                self.__classification = clazz
365                clazz._set_layer(self)
366    
367          self.__setClassLock = False              # only change things after a successful call
368                if old_class is not None:
369                    old_class._set_layer(None)
370            except ValueError:
371                self.__classification = old_class
372                raise ValueError
373    
374            # we don't need this since a message will be sent
375            # after calling _set_layer()
376            #self.changed(LAYER_CHANGED, self)
377    
378      def ClassChanged(self):      def ClassChanged(self):
379          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
# Line 349  class Layer(BaseLayer): Line 382  class Layer(BaseLayer):
382      def TreeInfo(self):      def TreeInfo(self):
383          items = []          items = []
384    
385            items.append(_("Filename: %s") % self.ShapeStore().FileName())
386    
387          if self.Visible():          if self.Visible():
388              items.append(_("Shown"))              items.append(_("Shown"))
389          else:          else:
# Line 371  class Layer(BaseLayer): Line 406  class Layer(BaseLayer):
406          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
407    
408    
409    if resource.has_gdal_support():
410        import gdal
411        from gdalconst import GA_ReadOnly
412    
413  class RasterLayer(BaseLayer):  class RasterLayer(BaseLayer):
414    
415      def __init__(self, title, filename, projection = None, visible = True):      def __init__(self, title, filename, projection = None, visible = True):
# Line 384  class RasterLayer(BaseLayer): Line 423  class RasterLayer(BaseLayer):
423                        the source image is in.                        the source image is in.
424    
425          visible -- True is the layer should initially be visible.          visible -- True is the layer should initially be visible.
426    
427            Throws IOError if the filename is invalid or points to a file that
428            is not in a format GDAL can use.
429          """          """
430    
431          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
# Line 393  class RasterLayer(BaseLayer): Line 435  class RasterLayer(BaseLayer):
435    
436          self.bbox = -1          self.bbox = -1
437    
438          self.UnsetModified()          if resource.has_gdal_support():
439                #
440                # temporarily open the file so that GDAL can test if it's valid.
441                #
442                dataset = gdal.Open(self.filename, GA_ReadOnly)
443    
444                if dataset is None:
445                    raise IOError()
446    
447            self.UnsetModified()
448    
449      def BoundingBox(self):      def BoundingBox(self):
450          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
451    
452          If the layer has no shapes, return None.          If the there is no support for images, or the file cannot
453            be read, or there is no geographics information available, return None.
454          """          """
455            if not resource.has_gdal_support():
456                return None
457    
458          if self.bbox == -1:          if self.bbox == -1:
459              dataset = gdal.Open(self.filename, GA_ReadOnly)              dataset = gdal.Open(self.filename, GA_ReadOnly)
460              if dataset is None:              if dataset is None:
461                  self.bbox = None                  self.bbox = None
462              else:              else:
463                  left, bottom = self.__CalcCorner(dataset,                  geotransform = dataset.GetGeoTransform()
464                                                   0, dataset.RasterYSize)                  if geotransform is None:
465                  right, top   = self.__CalcCorner(dataset,                      return None
466                                                   dataset.RasterXSize, 0)  
467                    x = 0
468                    y = dataset.RasterYSize
469                    left = geotransform[0] +        \
470                           geotransform[1] * x +    \
471                           geotransform[2] * y
472    
473                    bottom = geotransform[3] +      \
474                             geotransform[4] * x +  \
475                             geotransform[5] * y
476    
477                    x = dataset.RasterXSize
478                    y = 0
479                    right = geotransform[0] +       \
480                            geotransform[1] * x +   \
481                            geotransform[2] * y
482    
483                    top = geotransform[3] +         \
484                          geotransform[4] * x +     \
485                          geotransform[5] * y
486    
487                  self.bbox = (left, bottom, right, top)                  self.bbox = (left, bottom, right, top)
488    
489          return self.bbox          return self.bbox
490    
     def __CalcCorner(self, dataset, x, y):  
         geotransform = dataset.GetGeoTransform()  
         return geotransform[0] + geotransform[1] * x + geotransform[2] * y, \  
                geotransform[3] + geotransform[4] * x + geotransform[5] * y  
   
491      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
492          bbox = self.BoundingBox()          bbox = self.BoundingBox()
493          if bbox is not None:          if bbox is None:
             llx, lly, urx, ury = bbox  
             if self.projection is not None:  
                 llx, lly = self.projection.Inverse(llx, lly)  
                 urx, ury = self.projection.Inverse(urx, ury)  
             return llx, lly, urx, ury  
         else:  
494              return None              return None
495    
496            llx, lly, urx, ury = bbox
497            if self.projection is not None:
498                llx, lly = self.projection.Inverse(llx, lly)
499                urx, ury = self.projection.Inverse(urx, ury)
500    
501            return llx, lly, urx, ury
502    
503      def GetImageFilename(self):      def GetImageFilename(self):
504          return self.filename          return self.filename
505    
506      def TreeInfo(self):      def TreeInfo(self):
507          items = []          items = []
508    
509            items.append(_("Filename: %s") % self.GetImageFilename())
510    
511          if self.Visible():          if self.Visible():
512              items.append(_("Shown"))              items.append(_("Shown"))
513          else:          else:
514              items.append(_("Hidden"))              items.append(_("Hidden"))
         items.append(_("Shapes: %d") % self.NumShapes())  
515    
516          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
517          if bbox is not None:          if bbox is not None:
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