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"""Data source abstractions""" |
"""Data source abstractions""" |
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from __future__ import generators |
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__version__ = "$Revision$" |
__version__ = "$Revision$" |
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# $Source$ |
# $Source$ |
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# $Id$ |
# $Id$ |
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# raw data. |
# raw data. |
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RAW_SHAPEFILE = "RAW_SHAPEFILE" |
RAW_SHAPEFILE = "RAW_SHAPEFILE" |
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# Raw data in well-known text format |
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RAW_WKT = "RAW_WKT" |
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class ShapefileShape: |
class ShapefileShape: |
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ys.append(y) |
ys.append(y) |
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return (min(xs), min(ys), max(xs), max(ys)) |
return (min(xs), min(ys), max(xs), max(ys)) |
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def ShapeID(self): |
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return self.shapeid |
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def Points(self): |
def Points(self): |
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"""Return the coordinates of the shape as a list of lists of pairs""" |
"""Return the coordinates of the shape as a list of lists of pairs""" |
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shape = self.shapefile.read_object(self.shapeid) |
shape = self.shapefile.read_object(self.shapeid) |
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""" |
""" |
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return self.bbox |
return self.bbox |
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def ShapesInRegion(self, box): |
def ShapesInRegion(self, bbox): |
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"""Return the ids of the shapes that overlap the box. |
"""Return an iterable over the shapes that overlap the bounding box. |
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Box is a tuple (left, bottom, right, top) in the coordinate |
The bbox parameter should be the bounding box as a tuple in the |
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system used used in the shapefile. |
form (minx, miny, maxx, maxy) in the coordinate system of the |
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""" |
shape store. |
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left, bottom, right, top = box |
""" |
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return self.shapetree.find_shapes((left, bottom), (right, top)) |
left, bottom, right, top = bbox |
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for i in self.shapetree.find_shapes((left, bottom), (right, top)): |
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yield ShapefileShape(self.shapefile, i) |
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def AllShapes(self): |
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"""Return an iterable over the shapes in the shape store.""" |
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for i in xrange(self.NumShapes()): |
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yield ShapefileShape(self.shapefile, i) |
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def Shape(self, index): |
def Shape(self, index): |
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"""Return the shape with index index""" |
"""Return the shape with index index""" |
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""" |
""" |
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return self.shapestore.ShapesInRegion(bbox) |
return self.shapestore.ShapesInRegion(bbox) |
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def AllShapes(self): |
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"""Return an iterable over the shapes in the shape store. |
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This method is simply delegated to the shapestore the |
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DerivedShapeStore was instantiated with. |
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""" |
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return self.shapestore.AllShapes() |
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def ShapeType(self): |
def ShapeType(self): |
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"""Return the type of the shapes in the layer. |
"""Return the type of the shapes in the layer. |
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""" |
""" |
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return self.shapestore.ShapeType() |
return self.shapestore.ShapeType() |
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def RawShapeFormat(self): |
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"""Return the raw data format of the shapes. |
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This method is simply delegated to the shapestore the |
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DerivedShapeStore was instantiated with. |
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""" |
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return self.shapestore.RawShapeFormat() |
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def NumShapes(self): |
def NumShapes(self): |
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"""Return the number of shapes in the shapestore.""" |
"""Return the number of shapes in the shapestore.""" |
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return self.shapestore.NumShapes() |
return self.shapestore.NumShapes() |
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