/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 147 by bh, Tue May 7 16:39:52 2002 UTC revision 171 by bh, Tue May 14 14:16:24 2002 UTC
# Line 7  Line 7 
7    
8  __version__ = "$Revision$"  __version__ = "$Revision$"
9    
10    from math import log, ceil
11    
12  import shapelib, shptree  import shapelib, shptree
13    
14  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \
# Line 138  class Layer(BaseLayer): Line 140  class Layer(BaseLayer):
140              self.numshapes = numshapes              self.numshapes = numshapes
141              self.shapetype = shapelib_shapetypes[shapetype]              self.shapetype = shapelib_shapetypes[shapetype]
142              self.bbox = mins[:2] + maxs[:2]              self.bbox = mins[:2] + maxs[:2]
143              #print "building tree for", self.filename, "..."  
144              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2, 0)              # estimate a good depth for the quad tree. Each depth
145              #print "done"              # multiplies the number of nodes by four, therefore we
146                # basically take the base 4 logarithm of the number of
147                # shapes.
148                if self.numshapes < 4:
149                    maxdepth = 1
150                else:
151                    maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
152    
153                self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
154                                                 maxdepth)
155    
156      def BoundingBox(self):      def BoundingBox(self):
157          """Return the bounding box of the layer's shapes in their default          """Return the bounding box of the layer's shapes in their default
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