/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1452 by bh, Fri Jul 18 12:57:59 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, 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 204  class Layer(BaseLayer): Line 162  class Layer(BaseLayer):
162                  self.SetClassification(None)                  self.SetClassification(None)
163    
164          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)))  
165    
         self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,  
                                          maxdepth)  
166          self.changed(LAYER_SHAPESTORE_REPLACED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
167    
168      def ShapeStore(self):      def ShapeStore(self):
# Line 244  class Layer(BaseLayer): Line 179  class Layer(BaseLayer):
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 305  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))  
256    
257          return Shape(points)      def ShapesInRegion(self, bbox):
258            """Return an iterable over the shapes that overlap the bounding box.
259    
260      def ShapesInRegion(self, box):          The bbox parameter should be the bounding box as a tuple in the
261          """Return the ids of the shapes that overlap the box.          form (minx, miny, maxx, maxy) in unprojected coordinates.
   
         Box is a tuple (left, bottom, right, top) 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                             (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.shapetree.find_shapes((left, bottom), (right, top))          return self.store.ShapesInRegion(bbox)
274    
275      def GetClassificationColumn(self):      def GetClassificationColumn(self):
276          return self.classification_column          return self.classification_column
# Line 440  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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