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