/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1338 by jonathan, Tue Jul 1 16:10:00 2003 UTC revision 1599 by bh, Mon Aug 18 12:45:28 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 190  class Layer(BaseLayer): Line 147  class Layer(BaseLayer):
147          return value          return value
148    
149      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)  
150          # Set the classification to None if there is a classification          # Set the classification to None if there is a classification
151          # and the new shapestore doesn't have a table with a suitable          # and the new shapestore doesn't have a table with a suitable
152          # column, i.e one with the same name and type as before          # column, i.e one with the same name and type as before
153          # FIXME: Maybe we should keep it the same if the type is          # FIXME: Maybe we should keep it the same if the type is
154          # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT          # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
155          if self.__classification is not None:          if self.__classification is not None:
156              fieldname = self.__classification.GetField()              columnname = self.classification_column
157              fieldtype = self.__classification.GetFieldType()              columntype = self.GetFieldType(columnname)
158              table = self.store.Table()              table = store.Table()
159              if (fieldname is not None              if (columnname is not None
160                  and (not table.HasColumn(fieldname)                  and (not table.HasColumn(columnname)
161                       or table.Column(fieldname).type != fieldtype)):                       or table.Column(columnname).type != columntype)):
162                  self.SetClassification(None)                  self.SetClassification(None)
163    
164            self.store = store
165    
166          self.changed(LAYER_SHAPESTORE_REPLACED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
167    
168      def ShapeStore(self):      def ShapeStore(self):
# Line 235  class Layer(BaseLayer): Line 170  class Layer(BaseLayer):
170    
171      def Destroy(self):      def Destroy(self):
172          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
173          self.GetClassification()._set_layer(None)          if self.__classification is not None:
174                self.__classification.Unsubscribe(CLASS_CHANGED,
175                                                  self._classification_changed)
176    
177      def BoundingBox(self):      def BoundingBox(self):
178          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
179    
180          If the layer has no shapes, return None.          If the layer has no shapes, return None.
181          """          """
182          return self.bbox          return self.store.BoundingBox()
183    
184      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
185          """Return the layer's bounding box in lat/long coordinates.          """Return the layer's bounding box in lat/long coordinates.
# Line 292  class Layer(BaseLayer): Line 229  class Layer(BaseLayer):
229          return (min(llx), min(lly), max(urx), max(ury))          return (min(llx), min(lly), max(urx), max(ury))
230    
231      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
232          table = self.store.Table()          if self.store:
233          if table.HasColumn(fieldName):              table = self.store.Table()
234              return table.Column(fieldName).type              if table.HasColumn(fieldName):
235                    return table.Column(fieldName).type
236          return None          return None
237    
238      def HasShapes(self):      def HasShapes(self):
# Line 302  class Layer(BaseLayer): Line 240  class Layer(BaseLayer):
240    
241      def NumShapes(self):      def NumShapes(self):
242          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
243          return self.numshapes          return self.store.NumShapes()
244    
245      def ShapeType(self):      def ShapeType(self):
246          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
247          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.  
248            The return value is one of the SHAPETYPE_* constants defined in
249            Thuban.Model.data.
250          """          """
251          return self.shapetype          return self.store.ShapeType()
252    
253      def Shape(self, index):      def Shape(self, index):
254          """Return the shape with index index"""          """Return the shape with index index"""
255          shape = self.store.Shapefile().read_object(index)          return self.store.Shape(index)
   
         if self.shapetype == SHAPETYPE_POINT:  
             points = shape.vertices()  
         else:  
             #for poly in shape.vertices():  
             poly = shape.vertices()[0]  
             points = []  
             for x, y in poly:  
                 points.append((x, y))  
   
         return Shape(points)  
256    
257      def ShapesInRegion(self, box):      def ShapesInRegion(self, bbox):
258          """Return the ids of the shapes that overlap the box.          """Return an iterable over the shapes that overlap the bounding box.
259    
260          Box is a tuple (left, bottom, right, top) in unprojected coordinates.          The bbox parameter should be the bounding box as a tuple in the
261            form (minx, miny, maxx, maxy) in unprojected coordinates.
262          """          """
         left, bottom, right, top = box  
   
263          if self.projection is not None:          if self.projection is not None:
264              left,  bottom = self.projection.Forward(left, bottom)              left, bottom, right, top = bbox
265              right, top    = self.projection.Forward(right, top)              xs = []; ys = []
266                for x, y in [(left, bottom), (left, top), (right, top),
267          return self.shapetree.find_shapes((left, bottom), (right, top))                           (right, bottom)]:
268                    x, y = self.projection.Forward(x, y)
269                    xs.append(x)
270                    ys.append(y)
271                bbox = (min(xs), min(ys), max(xs), max(ys))
272    
273            return self.store.ShapesInRegion(bbox)
274    
275        def GetClassificationColumn(self):
276            return self.classification_column
277    
278        def SetClassificationColumn(self, column):
279            """Set the column to classifiy on, or None. If column is not None
280            and the column does not exist in the table, raise a ValueError.
281            """
282            if column:
283                columnType = self.GetFieldType(column)
284                if columnType is None:
285                    raise ValueError()
286            changed = self.classification_column != column
287            self.classification_column = column
288            if changed:
289                self.changed(LAYER_CHANGED, self)
290    
291      def HasClassification(self):      def HasClassification(self):
292          return True          return True
# Line 349  class Layer(BaseLayer): Line 299  class Layer(BaseLayer):
299    
300          If 'clazz' is None a default classification is created.          If 'clazz' is None a default classification is created.
301    
302          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.  
303          """          """
304    
305          old_class = self.__classification          if self.__classification is not None:
306                self.__classification.Unsubscribe(CLASS_CHANGED,
307                                                  self._classification_changed)
308    
309          if clazz is None:          if clazz is None:
310              clazz = classification.Classification()              clazz = classification.Classification()
311    
312          try:          self.__classification = clazz
313              clazz._set_layer(self)          self.__classification.Subscribe(CLASS_CHANGED,
314                                            self._classification_changed)
315    
316              # 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)  
317    
318      def ClassChanged(self):      def _classification_changed(self):
319          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
320          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_CHANGED, self)
321    
# Line 430  class RasterLayer(BaseLayer): Line 371  class RasterLayer(BaseLayer):
371          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
372    
373          self.projection = projection          self.projection = projection
374          self.filename = filename          self.filename = os.path.abspath(filename)
375    
376          self.bbox = -1          self.bbox = -1
377    
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