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- """Support for GEOS prepared geometry operations."""
- from pickle import PicklingError
- import shapely
- class PreparedGeometry:
- """A geometry prepared for efficient comparison to a set of other geometries.
- Examples
- --------
- >>> from shapely.prepared import prep
- >>> from shapely.geometry import Point, Polygon
- >>> triangle = Polygon([(0.0, 0.0), (1.0, 1.0), (1.0, -1.0)])
- >>> p = prep(triangle)
- >>> p.intersects(Point(0.5, 0.5))
- True
- """
- def __init__(self, context):
- """Prepare a geometry for efficient comparison to other geometries."""
- if isinstance(context, PreparedGeometry):
- self.context = context.context
- else:
- shapely.prepare(context)
- self.context = context
- self.prepared = True
- def contains(self, other):
- """Return True if the geometry contains the other, else False."""
- return self.context.contains(other)
- def contains_properly(self, other):
- """Return True if the geometry properly contains the other, else False."""
- return self.context.contains_properly(other)
- def covers(self, other):
- """Return True if the geometry covers the other, else False."""
- return self.context.covers(other)
- def crosses(self, other):
- """Return True if the geometries cross, else False."""
- return self.context.crosses(other)
- def disjoint(self, other):
- """Return True if geometries are disjoint, else False."""
- return self.context.disjoint(other)
- def intersects(self, other):
- """Return True if geometries intersect, else False."""
- return self.context.intersects(other)
- def overlaps(self, other):
- """Return True if geometries overlap, else False."""
- return self.context.overlaps(other)
- def touches(self, other):
- """Return True if geometries touch, else False."""
- return self.context.touches(other)
- def within(self, other):
- """Return True if geometry is within the other, else False."""
- return self.context.within(other)
- def __reduce__(self):
- """Pickling is not supported."""
- raise PicklingError("Prepared geometries cannot be pickled.")
- def prep(ob):
- """Create and return a prepared geometric object."""
- return PreparedGeometry(ob)
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