/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1452 by bh, Fri Jul 18 12:57:59 2003 UTC revision 1535 by bh, Fri Aug 1 14:27:13 2003 UTC
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
 from math import log, ceil  
11  import warnings  import warnings
12    
13  from Thuban import _  from Thuban import _
 import shapelib, shptree  
14    
15  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
16       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
# Line 21  import classification Line 19  import classification
19    
20  from color import Transparent, Black  from color import Transparent, Black
21  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
22    from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT, Shape
23    
24  import resource  import resource
25    
26    
 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}  
   
27  shapetype_names = {SHAPETYPE_POINT: "Point",  shapetype_names = {SHAPETYPE_POINT: "Point",
28                     SHAPETYPE_ARC: "Arc",                     SHAPETYPE_ARC: "Arc",
29                     SHAPETYPE_POLYGON: "Polygon"}                     SHAPETYPE_POLYGON: "Polygon"}
# Line 204  class Layer(BaseLayer): Line 161  class Layer(BaseLayer):
161                  self.SetClassification(None)                  self.SetClassification(None)
162    
163          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)))  
164    
         self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,  
                                          maxdepth)  
165          self.changed(LAYER_SHAPESTORE_REPLACED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
166    
167      def ShapeStore(self):      def ShapeStore(self):
# Line 244  class Layer(BaseLayer): Line 178  class Layer(BaseLayer):
178    
179          If the layer has no shapes, return None.          If the layer has no shapes, return None.
180          """          """
181          return self.bbox          return self.store.BoundingBox()
182    
183      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
184          """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 239  class Layer(BaseLayer):
239    
240      def NumShapes(self):      def NumShapes(self):
241          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
242          return self.numshapes          return self.store.NumShapes()
243    
244      def ShapeType(self):      def ShapeType(self):
245          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
246          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.  
247            The return value is one of the SHAPETYPE_* constants defined in
248            Thuban.Model.data.
249          """          """
250          return self.shapetype          return self.store.ShapeType()
251    
252      def Shape(self, index):      def Shape(self, index):
253          """Return the shape with index index"""          """Return the shape with index index"""
254          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)  
255    
256      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
257          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
# Line 339  class Layer(BaseLayer): Line 264  class Layer(BaseLayer):
264              left,  bottom = self.projection.Forward(left, bottom)              left,  bottom = self.projection.Forward(left, bottom)
265              right, top    = self.projection.Forward(right, top)              right, top    = self.projection.Forward(right, top)
266    
267          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.store.ShapesInRegion((left, bottom, right, top))
268    
269      def GetClassificationColumn(self):      def GetClassificationColumn(self):
270          return self.classification_column          return self.classification_column
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