smbinterp/interp/grid/delaunay.py

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import re
import logging
log = logging.getLogger("interp")
from interp.grid import grid as basegrid, cell
from subprocess import Popen, PIPE
def get_qdelaunay_dump(g):
"""
pass in interp.grid g, and get back lines from a qhull triangulation:
qdelaunay Qt f
"""
cmd = 'qdelaunay Qt f'
p = Popen(cmd.split(), bufsize=1, stdin=PIPE, stdout=PIPE)
so, se = p.communicate(g.for_qhull())
for i in so.splitlines():
yield i
def get_qdelaunay_dump_str(g):
return "\n".join(get_qdelaunay_dump(g))
def get_index_only(g):
cmd = 'qdelaunay Qt i'
p = Popen(cmd.split(), bufsize=1, stdin=PIPE, stdout=PIPE)
so, se = p.communicate(g.for_qhull())
for i in so.splitlines():
yield i
def get_index_only_str(g):
return "\n".join(get_index_only(g))
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class dgrid(basegrid):
cell_re = re.compile(r'''
-\s+(?P<cell>f\d+).*?
vertices:\s(?P<verts>.*?)\n.*?
neighboring\s facets:\s+(?P<neigh>[\sf\d]*)
''', re.S|re.X)
vert_re = re.compile(r'''
(p\d+)
''', re.S|re.X)
def __init__(self, verts, q = None):
self.dim = len(verts[0])
basegrid.__init__(self, verts,q)
self.construct_connectivity()
def construct_connectivity(self):
"""
a call to this method prepares the internal connectivity structure.
"""
log.info('start')
qdelaunay_string = get_qdelaunay_dump_str(self)
with open('/tmp/qdel.out', 'w') as of:
of.write(qdelaunay_string)
cell_to_cells = []
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for matcher in dgrid.cell_re.finditer(qdelaunay_string):
d = matcher.groupdict()
cell_name = d['cell']
verticies = d['verts']
neighboring_cells = d['neigh']
cur_cell = cell(cell_name)
self.cells[cell_name] = cur_cell
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for v in dgrid.vert_re.findall(verticies):
vertex_index = int(v[1:])
cur_cell.add_vert(vertex_index)
self.cells_for_vert[vertex_index].append(cur_cell)
nghbrs = [(cell_name, i) for i in neighboring_cells.split()]
cell_to_cells.extend(nghbrs)
log.debug(cell_to_cells)
for rel in cell_to_cells:
if rel[1] in self.cells:
self.cells[rel[0]].add_neighbor(self.cells[rel[1]])
log.debug(self.cells)
log.info('end')