/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/layer.py
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revision 1452 by bh, Fri Jul 18 12:57:59 2003 UTC revision 1978 by bh, Tue Nov 25 14:30:34 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, CLASS_CHANGED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
# Line 21  import classification Line 20  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 167  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):
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
# Line 204  class Layer(BaseLayer): Line 141  class Layer(BaseLayer):
141                  self.SetClassification(None)                  self.SetClassification(None)
142    
143          self.store = 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)))  
144    
         self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,  
                                          maxdepth)  
145          self.changed(LAYER_SHAPESTORE_REPLACED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
146    
147      def ShapeStore(self):      def ShapeStore(self):
# Line 244  class Layer(BaseLayer): Line 158  class Layer(BaseLayer):
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 305  class Layer(BaseLayer): Line 219  class Layer(BaseLayer):
219    
220      def NumShapes(self):      def NumShapes(self):
221          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
222          return self.numshapes          return self.store.NumShapes()
223    
224      def ShapeType(self):      def ShapeType(self):
225          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
226          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.  
227            The return value is one of the SHAPETYPE_* constants defined in
228            Thuban.Model.data.
229          """          """
230          return self.shapetype          return self.store.ShapeType()
231    
232      def Shape(self, index):      def Shape(self, index):
233          """Return the shape with index index"""          """Return the shape with index index"""
234          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)  
235    
236      def ShapesInRegion(self, box):      def ShapesInRegion(self, bbox):
237          """Return the ids of the shapes that overlap the box.          """Return an iterable over the shapes that overlap the bounding box.
238    
239          Box is a tuple (left, bottom, right, top) in unprojected coordinates.          The bbox parameter should be the bounding box as a tuple in the
240            form (minx, miny, maxx, maxy) in unprojected coordinates.
241          """          """
         left, bottom, right, top = box  
   
242          if self.projection is not None:          if self.projection is not None:
243              left,  bottom = self.projection.Forward(left, bottom)              left, bottom, right, top = bbox
244              right, top    = self.projection.Forward(right, top)              xs = []; ys = []
245                for x, y in [(left, bottom), (left, top), (right, top),
246                             (right, bottom)]:
247                    x, y = self.projection.Forward(x, y)
248                    xs.append(x)
249                    ys.append(y)
250                bbox = (min(xs), min(ys), max(xs), max(ys))
251    
252          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.store.ShapesInRegion(bbox)
253    
254      def GetClassificationColumn(self):      def GetClassificationColumn(self):
255          return self.classification_column          return self.classification_column
# Line 440  class RasterLayer(BaseLayer): Line 350  class RasterLayer(BaseLayer):
350          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
351    
352          self.projection = projection          self.projection = projection
353          self.filename = filename          self.filename = os.path.abspath(filename)
354    
355          self.bbox = -1          self.bbox = -1
356    
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