def __init__(self, coordinates, triangles,
boundary=None,
tagged_elements=None,
geo_reference=None,
use_inscribed_circle=False,
verbose=False):
"""
Build Mesh
Input x,y coordinates (sequence of 2-tuples or Mx2 numeric array of floats)
triangles (sequence of 3-tuples or Nx3 numeric array of non-negative integers).
"""
General_mesh.__init__(self, coordinates, triangles,
geo_reference=geo_reference,
use_inscribed_circle=use_inscribed_circle,
verbose=verbose)
if verbose: log.critical('Mesh: Initialising')
N = len(self) #Number_of_triangles
# Allocate arrays for neighbour data
self.neighbours = -1*num.ones((N, 3), num.int)
self.neighbour_edges = -1*num.ones((N, 3), num.int)
self.number_of_boundaries = num.zeros(N, num.int)
self.surrogate_neighbours = num.zeros((N, 3), num.int)
#Get x,y coordinates for all triangles and store
V = self.vertex_coordinates # Relative coordinates
# #Initialise each triangle
# if verbose: log.critical('Mesh: Computing centroids and radii')
# for i in range(N):
# if verbose and i % ((N+10)/10) == 0: log.critical('(%d/%d)' % (i, N))
#
# x0, y0 = V[3*i, :]
# x1, y1 = V[3*i+1, :]
# x2, y2 = V[3*i+2, :]
#
# #x0 = V[i, 0]; y0 = V[i, 1]
# #x1 = V[i, 2]; y1 = V[i, 3]
# #x2 = V[i, 4]; y2 = V[i, 5]
#
# #Compute centroid
# centroid = num.array([(x0 + x1 + x2)/3, (y0 + y1 + y2)/3], num.float)
# self.centroid_coordinates[i] = centroid
#
#
# if self.use_inscribed_circle == False:
# #OLD code. Computed radii may exceed that of an
# #inscribed circle
#
# #Midpoints
# m0 = num.array([(x1 + x2)/2, (y1 + y2)/2], num.float)
# m1 = num.array([(x0 + x2)/2, (y0 + y2)/2], num.float)
# m2 = num.array([(x1 + x0)/2, (y1 + y0)/2], num.float)
#
# #The radius is the distance from the centroid of
# #a triangle to the midpoint of the side of the triangle
# #closest to the centroid
# d0 = num.sqrt(num.sum( (centroid-m0)**2 ))
# d1 = num.sqrt(num.sum( (centroid-m1)**2 ))
# d2 = num.sqrt(num.sum( (centroid-m2)**2 ))
#
# self.radii[i] = min(d0, d1, d2)
#
# else:
# #NEW code added by Peter Row. True radius
# #of inscribed circle is computed
#
# a = num.sqrt((x0-x1)**2+(y0-y1)**2)
# b = num.sqrt((x1-x2)**2+(y1-y2)**2)
# c = num.sqrt((x2-x0)**2+(y2-y0)**2)
#
# self.radii[i]=2.0*self.areas[i]/(a+b+c)
#
#
# #Initialise Neighbours (-1 means that it is a boundary neighbour)
# self.neighbours[i, :] = [-1, -1, -1]
#
# #Initialise edge ids of neighbours
# #In case of boundaries this slot is not used
# self.neighbour_edges[i, :] = [-1, -1, -1]
#Build neighbour structure
if verbose: log.critical('Mesh: Building neigbour structure')
self.build_neighbour_structure()
#Build surrogate neighbour structure
if verbose: log.critical('Mesh: Building surrogate neigbour structure')
self.build_surrogate_neighbour_structure()
#Build boundary dictionary mapping (id, edge) to symbolic tags
if verbose: log.critical('Mesh: Building boundary dictionary')
self.build_boundary_dictionary(boundary)
#Update boundary_enumeration
self.build_boundary_neighbours()
#Build tagged element dictionary mapping (tag) to array of elements
if verbose: log.critical('Mesh: Building tagged elements dictionary')
self.build_tagged_elements_dictionary(tagged_elements)
# Build a list of vertices that are not connected to any triangles
self.lone_vertices = []
#Check that all vertices have been registered
for node, count in enumerate(self.number_of_triangles_per_node):
#msg = 'Node %d does not belong to an element.' %node
#assert count > 0, msg
if count == 0:
self.lone_vertices.append(node)
#Update boundary indices FIXME: OBSOLETE
#self.build_boundary_structure()
#FIXME check integrity?
if verbose: log.critical('Mesh: Done')
if verbose: log.timingInfo("finishMesh, '%s'" % log.CurrentDateTime())
if verbose: log.resource_usage_timing(log.logging.INFO, "finishMesh_")
def __repr__(self):
return General_mesh.__repr__(self) + ', %d boundary segments'\
%(len(self.boundary))
