/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1338 by jonathan, Tue Jul 1 16:10:00 2003 UTC revision 1983 by bh, Thu Nov 27 15:57:23 2003 UTC
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
11  from math import log, ceil  import os
12  import warnings  import warnings
13    
14  from Thuban import _  from Thuban import _
 import shapelib, shptree  
15    
16  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
17       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
18    
19  import classification  import classification
20    
21  from color import Transparent, Black  from color import Transparent, Black
22  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
23    from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT
24    
25  import resource  import resource
26    
27    
 class Shape:  
   
     """Represent one shape"""  
   
     def __init__(self, points):  
         self.points = points  
         #self.compute_bbox()  
         self.bbox = None  
   
     def compute_bbox(self):  
         if self.bbox is not None:  
             return self.bbox  
   
         xs = []  
         ys = []  
         for x, y in self.points:  
             xs.append(x)  
             ys.append(y)  
         self.llx = min(xs)  
         self.lly = min(ys)  
         self.urx = max(xs)  
         self.ury = max(ys)  
   
         self.bbox = (self.llx, self.lly, self.urx, self.ury)  
   
         return self.bbox  
   
     def Points(self):  
         return self.points  
   
   
   
 # Shape type constants  
 SHAPETYPE_POLYGON = "polygon"  
 SHAPETYPE_ARC = "arc"  
 SHAPETYPE_POINT = "point"  
   
 # mapping from shapelib shapetype constants to our constants  
 shapelib_shapetypes = {shapelib.SHPT_POLYGON: SHAPETYPE_POLYGON,  
                        shapelib.SHPT_ARC: SHAPETYPE_ARC,  
                        shapelib.SHPT_POINT: SHAPETYPE_POINT}  
   
28  shapetype_names = {SHAPETYPE_POINT: "Point",  shapetype_names = {SHAPETYPE_POINT: "Point",
29                     SHAPETYPE_ARC: "Arc",                     SHAPETYPE_ARC: "Arc",
30                     SHAPETYPE_POLYGON: "Polygon"}                     SHAPETYPE_POLYGON: "Polygon"}
# Line 152  class Layer(BaseLayer): Line 110  class Layer(BaseLayer):
110                                   visible = visible,                                   visible = visible,
111                                   projection = projection)                                   projection = projection)
112    
         #  
         # this is really important so that when the classification class  
         # tries to set its parent layer the variable will exist  
         #  
113          self.__classification = None          self.__classification = None
114            self.store = None
115    
116          self.SetShapeStore(data)          self.SetShapeStore(data)
117    
118            self.classification_column = None
119            self.SetClassificationColumn(None)
120          self.SetClassification(None)          self.SetClassification(None)
121    
122          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
# Line 168  class Layer(BaseLayer): Line 125  class Layer(BaseLayer):
125    
126          self.UnsetModified()          self.UnsetModified()
127    
     def __getattr__(self, attr):  
         """Access to some attributes for backwards compatibility  
   
         The attributes implemented here are now held by the shapestore  
         if at all. For backwards compatibility pretend that they are  
         still there but issue a DeprecationWarning when they are  
         accessed.  
         """  
         if attr in ("table", "shapetable"):  
             value = self.store.Table()  
         elif attr == "shapefile":  
             value = self.store.Shapefile()  
         elif attr == "filename":  
             value = self.store.FileName()  
         else:  
             raise AttributeError, attr  
         warnings.warn("The Layer attribute %r is deprecated."  
                       " It's value can be accessed through the shapestore"  
                       % attr, DeprecationWarning, stacklevel = 2)  
         return value  
   
128      def SetShapeStore(self, store):      def SetShapeStore(self, store):
         self.store = store  
         shapefile = self.store.Shapefile()  
   
         numshapes, shapetype, mins, maxs = shapefile.info()  
         self.numshapes = numshapes  
         self.shapetype = shapelib_shapetypes[shapetype]  
   
         # if there are shapes, set the bbox accordingly. Otherwise  
         # set it to None.  
         if self.numshapes:  
             self.bbox = mins[:2] + maxs[:2]  
         else:  
             self.bbox = None  
   
         # estimate a good depth for the quad tree. Each depth  
         # multiplies the number of nodes by four, therefore we  
         # basically take the base 4 logarithm of the number of  
         # shapes.  
         if self.numshapes < 4:  
             maxdepth = 1  
         else:  
             maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))  
   
         self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,  
                                          maxdepth)  
129          # Set the classification to None if there is a classification          # Set the classification to None if there is a classification
130          # and the new shapestore doesn't have a table with a suitable          # and the new shapestore doesn't have a table with a suitable
131          # column, i.e one with the same name and type as before          # column, i.e one with the same name and type as before
132          # FIXME: Maybe we should keep it the same if the type is          # FIXME: Maybe we should keep it the same if the type is
133          # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT          # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
134          if self.__classification is not None:          if self.__classification is not None:
135              fieldname = self.__classification.GetField()              columnname = self.classification_column
136              fieldtype = self.__classification.GetFieldType()              columntype = self.GetFieldType(columnname)
137              table = self.store.Table()              table = store.Table()
138              if (fieldname is not None              if (columnname is not None
139                  and (not table.HasColumn(fieldname)                  and (not table.HasColumn(columnname)
140                       or table.Column(fieldname).type != fieldtype)):                       or table.Column(columnname).type != columntype)):
141                  self.SetClassification(None)                  self.SetClassification(None)
142    
143            self.store = store
144    
145          self.changed(LAYER_SHAPESTORE_REPLACED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
146    
147      def ShapeStore(self):      def ShapeStore(self):
# Line 235  class Layer(BaseLayer): Line 149  class Layer(BaseLayer):
149    
150      def Destroy(self):      def Destroy(self):
151          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
152          self.GetClassification()._set_layer(None)          if self.__classification is not None:
153                self.__classification.Unsubscribe(CLASS_CHANGED,
154                                                  self._classification_changed)
155    
156      def BoundingBox(self):      def BoundingBox(self):
157          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
158    
159          If the layer has no shapes, return None.          If the layer has no shapes, return None.
160          """          """
161          return self.bbox          return self.store.BoundingBox()
162    
163      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
164          """Return the layer's bounding box in lat/long coordinates.          """Return the layer's bounding box in lat/long coordinates.
# Line 250  class Layer(BaseLayer): Line 166  class Layer(BaseLayer):
166          Return None, if the layer doesn't contain any shapes.          Return None, if the layer doesn't contain any shapes.
167          """          """
168          bbox = self.BoundingBox()          bbox = self.BoundingBox()
169          if bbox is not None:          if bbox is not None and self.projection is not None:
170              llx, lly, urx, ury = bbox              bbox = self.projection.InverseBBox(bbox)
171              if self.projection is not None:          return bbox
                 llx, lly = self.projection.Inverse(llx, lly)  
                 urx, ury = self.projection.Inverse(urx, ury)  
             return llx, lly, urx, ury  
         else:  
             return None  
172    
173      def ShapesBoundingBox(self, shapes):      def ShapesBoundingBox(self, shapes):
174          """Return a bounding box in lat/long coordinates for the given          """Return a bounding box in lat/long coordinates for the given
# Line 268  class Layer(BaseLayer): Line 179  class Layer(BaseLayer):
179    
180          if shapes is None or len(shapes) == 0: return None          if shapes is None or len(shapes) == 0: return None
181    
182          llx = []          xs = []
183          lly = []          ys = []
         urx = []  
         ury = []  
   
         if self.projection is not None:  
             inverse = lambda x, y: self.projection.Inverse(x, y)  
         else:  
             inverse = lambda x, y: (x, y)  
184    
185          for id in shapes:          for id in shapes:
186              left, bottom, right, top = self.Shape(id).compute_bbox()              bbox = self.Shape(id).compute_bbox()
187                if self.projection is not None:
188              left, bottom = inverse(left, bottom)                  bbox = self.projection.InverseBBox(bbox)
189              right, top   = inverse(right, top)              left, bottom, right, top = bbox
190                xs.append(left); xs.append(right)
191                ys.append(bottom); ys.append(top)
192    
193              llx.append(left)          return (min(xs), min(ys), max(xs), max(ys))
             lly.append(bottom)  
             urx.append(right)  
             ury.append(top)  
194    
         return (min(llx), min(lly), max(urx), max(ury))  
195    
196      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
197          table = self.store.Table()          if self.store:
198          if table.HasColumn(fieldName):              table = self.store.Table()
199              return table.Column(fieldName).type              if table.HasColumn(fieldName):
200                    return table.Column(fieldName).type
201          return None          return None
202    
203      def HasShapes(self):      def HasShapes(self):
# Line 302  class Layer(BaseLayer): Line 205  class Layer(BaseLayer):
205    
206      def NumShapes(self):      def NumShapes(self):
207          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
208          return self.numshapes          return self.store.NumShapes()
209    
210      def ShapeType(self):      def ShapeType(self):
211          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
212          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.  
213            The return value is one of the SHAPETYPE_* constants defined in
214            Thuban.Model.data.
215          """          """
216          return self.shapetype          return self.store.ShapeType()
217    
218      def Shape(self, index):      def Shape(self, index):
219          """Return the shape with index index"""          """Return the shape with index index"""
220          shape = self.store.Shapefile().read_object(index)          return self.store.Shape(index)
221    
222          if self.shapetype == SHAPETYPE_POINT:      def ShapesInRegion(self, bbox):
223              points = shape.vertices()          """Return an iterable over the shapes that overlap the bounding box.
         else:  
             #for poly in shape.vertices():  
             poly = shape.vertices()[0]  
             points = []  
             for x, y in poly:  
                 points.append((x, y))  
   
         return Shape(points)  
   
     def ShapesInRegion(self, box):  
         """Return the ids of the shapes that overlap the box.  
224    
225          Box is a tuple (left, bottom, right, top) in unprojected coordinates.          The bbox parameter should be the bounding box as a tuple in the
226            form (minx, miny, maxx, maxy) in unprojected coordinates.
227          """          """
         left, bottom, right, top = box  
   
228          if self.projection is not None:          if self.projection is not None:
229              left,  bottom = self.projection.Forward(left, bottom)              bbox = self.projection.ForwardBBox(bbox)
230              right, top    = self.projection.Forward(right, top)          return self.store.ShapesInRegion(bbox)
231    
232        def GetClassificationColumn(self):
233            return self.classification_column
234    
235          return self.shapetree.find_shapes((left, bottom), (right, top))      def SetClassificationColumn(self, column):
236            """Set the column to classifiy on, or None. If column is not None
237            and the column does not exist in the table, raise a ValueError.
238            """
239            if column:
240                columnType = self.GetFieldType(column)
241                if columnType is None:
242                    raise ValueError()
243            changed = self.classification_column != column
244            self.classification_column = column
245            if changed:
246                self.changed(LAYER_CHANGED, self)
247    
248      def HasClassification(self):      def HasClassification(self):
249          return True          return True
# Line 349  class Layer(BaseLayer): Line 256  class Layer(BaseLayer):
256    
257          If 'clazz' is None a default classification is created.          If 'clazz' is None a default classification is created.
258    
259          ValueError is raised if the classification's field name          This issues a LAYER_CHANGED event.
         and type are different (if they aren't None) than what  
         is in the shapestore. The Layer will not be changed in  
         this case.  
260          """          """
261    
262          old_class = self.__classification          if self.__classification is not None:
263                self.__classification.Unsubscribe(CLASS_CHANGED,
264                                                  self._classification_changed)
265    
266          if clazz is None:          if clazz is None:
267              clazz = classification.Classification()              clazz = classification.Classification()
268    
269          try:          self.__classification = clazz
270              clazz._set_layer(self)          self.__classification.Subscribe(CLASS_CHANGED,
271                                            self._classification_changed)
272    
273              # only change things after a successful call          self._classification_changed()
             if old_class is not None:  
                 old_class._set_layer(None)  
             self.__classification = clazz  
         except ValueError:  
             raise ValueError  
   
         # we don't need this since a message will be sent  
         # after calling _set_layer()  
         #self.changed(LAYER_CHANGED, self)  
274    
275      def ClassChanged(self):      def _classification_changed(self):
276          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
277          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_CHANGED, self)
278    
# Line 430  class RasterLayer(BaseLayer): Line 328  class RasterLayer(BaseLayer):
328          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
329    
330          self.projection = projection          self.projection = projection
331          self.filename = filename          self.filename = os.path.abspath(filename)
332    
333          self.bbox = -1          self.bbox = -1
334    
# Line 492  class RasterLayer(BaseLayer): Line 390  class RasterLayer(BaseLayer):
390          if bbox is None:          if bbox is None:
391              return None              return None
392    
         llx, lly, urx, ury = bbox  
393          if self.projection is not None:          if self.projection is not None:
394              llx, lly = self.projection.Inverse(llx, lly)              bbox = self.projection.InverseBBox(bbox)
             urx, ury = self.projection.Inverse(urx, ury)  
395    
396          return llx, lly, urx, ury          return bbox
397    
398      def GetImageFilename(self):      def GetImageFilename(self):
399          return self.filename          return self.filename
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