/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/data.py
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revision 1551 by bh, Wed Aug 6 17:21:07 2003 UTC revision 1605 by bh, Tue Aug 19 11:00:40 2003 UTC
# Line 7  Line 7 
7    
8  """Data source abstractions"""  """Data source abstractions"""
9    
10    from __future__ import generators
11    
12  __version__ = "$Revision$"  __version__ = "$Revision$"
13  # $Source$  # $Source$
14  # $Id$  # $Id$
# Line 32  shapelib_shapetypes = {shapelib.SHPT_POL Line 34  shapelib_shapetypes = {shapelib.SHPT_POL
34                         shapelib.SHPT_ARC: SHAPETYPE_ARC,                         shapelib.SHPT_ARC: SHAPETYPE_ARC,
35                         shapelib.SHPT_POINT: SHAPETYPE_POINT}                         shapelib.SHPT_POINT: SHAPETYPE_POINT}
36    
37    #
38    # Raw shape data formats
39    #
40    
41  class Shape:  # Raw data is the same as that returned by the points method.
42    RAW_PYTHON = "RAW_PYTHON"
43    
44      """Represent one shape"""  # Raw data is a shapefile. The Shape object will use the shapeid as the
45    # raw data.
46    RAW_SHAPEFILE = "RAW_SHAPEFILE"
47    
48      def __init__(self, points):  # Raw data in well-known text format
49          self.points = points  RAW_WKT = "RAW_WKT"
         #self.compute_bbox()  
         self.bbox = None  
50    
     def compute_bbox(self):  
         if self.bbox is not None:  
             return self.bbox  
51    
52    class ShapefileShape:
53    
54        """Represent one shape of a shapefile"""
55    
56        def __init__(self, shapefile, shapeid):
57            self.shapefile = shapefile
58            self.shapeid = shapeid
59    
60        def compute_bbox(self):
61            """
62            Return the bounding box of the shape as a tuple (minx,miny,maxx,maxy)
63            """
64          xs = []          xs = []
65          ys = []          ys = []
66          for part in self.points:          for part in self.Points():
67              for x, y in part:              for x, y in part:
68                  xs.append(x)                  xs.append(x)
69                  ys.append(y)                  ys.append(y)
70          self.llx = min(xs)          return (min(xs), min(ys), max(xs), max(ys))
         self.lly = min(ys)  
         self.urx = max(xs)  
         self.ury = max(ys)  
71    
72          self.bbox = (self.llx, self.lly, self.urx, self.ury)      def ShapeID(self):
73            return self.shapeid
         return self.bbox  
74    
75      def Points(self):      def Points(self):
76          return self.points          """Return the coordinates of the shape as a list of lists of pairs"""
77            shape = self.shapefile.read_object(self.shapeid)
78            points = shape.vertices()
79            if self.shapefile.info()[1] == shapelib.SHPT_POINT:
80                points = [points]
81            return points
82    
83        def RawData(self):
84            """Return the shape id to use with the shapefile"""
85            return self.shapeid
86    
87        def Shapefile(self):
88            """Return the shapefile object"""
89            return self.shapefile
90    
91    
92  class ShapeTable(transientdb.AutoTransientTable):  class ShapeTable(transientdb.AutoTransientTable):
# Line 146  class ShapefileStore: Line 169  class ShapefileStore:
169          """          """
170          return self.shapetype          return self.shapetype
171    
172        def RawShapeFormat(self):
173            """Return the raw data format of the shape data, i.e. RAW_SHAPEFILE"""
174            return RAW_SHAPEFILE
175    
176      def NumShapes(self):      def NumShapes(self):
177          """Return the number of shapes in the shape store"""          """Return the number of shapes in the shape store"""
178          return self.numshapes          return self.numshapes
# Line 172  class ShapefileStore: Line 199  class ShapefileStore:
199          """          """
200          return self.bbox          return self.bbox
201    
202      def ShapesInRegion(self, box):      def ShapesInRegion(self, bbox):
203          """Return the ids of the shapes that overlap the box.          """Return an iterable over the shapes that overlap the bounding box.
204    
205          Box is a tuple (left, bottom, right, top) in the coordinate          The bbox parameter should be the bounding box as a tuple in the
206          system used used in the shapefile.          form (minx, miny, maxx, maxy) in the coordinate system of the
207          """          shape store.
208          left, bottom, right, top = box          """
209          return self.shapetree.find_shapes((left, bottom), (right, top))          left, bottom, right, top = bbox
210            for i in self.shapetree.find_shapes((left, bottom), (right, top)):
211                yield ShapefileShape(self.shapefile, i)
212    
213        def AllShapes(self):
214            """Return an iterable over the shapes in the shape store."""
215            for i in xrange(self.NumShapes()):
216                yield ShapefileShape(self.shapefile, i)
217    
218      def Shape(self, index):      def Shape(self, index):
219          """Return the shape with index index"""          """Return the shape with index index"""
220          shape = self.shapefile.read_object(index)          return ShapefileShape(self.shapefile, index)
   
         if self.ShapeType() == SHAPETYPE_POINT:  
             points = [shape.vertices()]  
         else:  
             points = []  
             for poly in shape.vertices():  
                 part = []  
                 for x, y in poly:  
                     part.append((x, y))  
                 points.append(part)  
   
         return Shape(points)  
221    
222    
223    
# Line 250  class DerivedShapeStore: Line 272  class DerivedShapeStore:
272          """          """
273          return self.shapestore.ShapesInRegion(bbox)          return self.shapestore.ShapesInRegion(bbox)
274    
275        def AllShapes(self):
276            """Return an iterable over the shapes in the shape store.
277    
278            This method is simply delegated to the shapestore the
279            DerivedShapeStore was instantiated with.
280            """
281            return self.shapestore.AllShapes()
282    
283      def ShapeType(self):      def ShapeType(self):
284          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
285    
# Line 258  class DerivedShapeStore: Line 288  class DerivedShapeStore:
288          """          """
289          return self.shapestore.ShapeType()          return self.shapestore.ShapeType()
290    
291        def RawShapeFormat(self):
292            """Return the raw data format of the shapes.
293    
294            This method is simply delegated to the shapestore the
295            DerivedShapeStore was instantiated with.
296            """
297            return self.shapestore.RawShapeFormat()
298    
299      def NumShapes(self):      def NumShapes(self):
300          """Return the number of shapes in the shapestore."""          """Return the number of shapes in the shapestore."""
301          return self.shapestore.NumShapes()          return self.shapestore.NumShapes()
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