71 lines
1.9 KiB
Python
71 lines
1.9 KiB
Python
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import operator
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from functools import reduce
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from django.core import checks
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from shapely import speedups
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if speedups.available:
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speedups.enable()
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try:
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import rtree
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except OSError:
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rtree_index = False
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class Index:
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def __init__(self):
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self.objects = {}
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def insert(self, value, geometry):
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self.objects[value] = geometry
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def delete(self, value):
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self.objects.pop(value)
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def intersections(self, geometry):
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return self.objects.values()
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else:
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rtree_index = True
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class Index:
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def __init__(self):
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self._index = rtree.index.Index()
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self._bounds = {}
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def insert(self, value, geometry):
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try:
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geoms = geometry.geoms
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except AttributeError:
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self._bounds.setdefault(value, []).append(geometry.bounds)
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self._index.insert(value, geometry.bounds)
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else:
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for geom in geoms:
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self.insert(value, geom)
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def delete(self, value):
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for bounds in self._bounds.pop(value):
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self._index.delete(value, bounds)
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def intersections(self, geometry):
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try:
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geoms = geometry.geoms
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except AttributeError:
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return set(self._index.intersection(geometry.bounds))
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else:
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return reduce(operator.__or__, (self.intersections(geom) for geom in geoms), set())
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@checks.register()
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def check_svg_renderer(app_configs, **kwargs):
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errors = []
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if not rtree_index:
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errors.append(
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checks.Warning(
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'The libspatialindex_c library is missing. This will drastically slow down c3nav rendering.',
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obj='rtree.index.Index',
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id='c3nav.mapdata.W001',
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)
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)
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return errors
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