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#############################################################
## ##
## Copyright (c) 2003-2017 by The University of Queensland ##
## Centre for Geoscience Computing ##
## http://earth.uq.edu.au/centre-geoscience-computing ##
## ##
## Primary Business: Brisbane, Queensland, Australia ##
## Licensed under the Open Software License version 3.0 ##
## http://www.apache.org/licenses/LICENSE-2.0 ##
## ##
#############################################################
import os
import re
VTK_LINE = 3
VTK_PIXEL = 8
VTK_VOXEL = 11
class ParseError(Exception):
pass
def findFileMatch(regExprString, f):
expr = re.compile(regExprString)
line = f.readline()
match = expr.match(line)
while ((match == None) and (len(line) > 0)):
line = f.readline()
match = expr.match(line)
return match
class Node:
def __init__(self, mshLine=None, ptLine=None):
self.id = None
self.idCirc = None
self.tag = None
self.pt = [0.0]*3
if (mshLine != None):
self.initFromMeshLine(mshLine)
elif (ptLine != None):
self.initFromPtLine(ptLine)
def initFromMeshLine(self, line):
elemList = str.split(str.strip(line), " ")
self.id = int(elemList[0])
self.idCirc = int(elemList[1])
self.tag = int(elemList[2])
ptList = list(map(float, elemList[3:]))
self.pt = [0.0]*3
self.pt[0:len(ptList)] = ptList
def initFromPtLine(self, line):
elemList = str.split(str.strip(line), " ")
ptList = list(map(float, elemList))
self.pt = [0.0]*3
self.pt[0:len(ptList)] = ptList
def translateBy(self, displacement):
self.pt[0:len(displacement)] = \
[self.pt[i] + displacement[i] for i in range(0, len(displacement))]
def writePt(self, f):
f.write(str.join(" ", (list(map(str, self.pt)))))
numNodesVtkCellTypeDict = dict()
numNodesVtkCellTypeDict[2] = VTK_LINE
numNodesVtkCellTypeDict[4] = VTK_PIXEL
numNodesVtkCellTypeDict[8] = VTK_VOXEL
class Cell:
def __init__(self, meshLine=None, nodeIdLine=None):
self.id = None
self.tag = None
self.nodeIdList = []
if (meshLine != None):
self.initFromMeshLine(meshLine)
elif (nodeIdLine != None):
self.initFromNodeIdLine(nodeIdLine)
def initFromMeshLine(self, line):
elemList = str.split(str.strip(line), " ")
self.id = int(elemList[0])
self.tag = int(elemList[1])
self.nodeIdList = list(map(int, elemList[2:]))
def initFromNodeIdLine(self, line):
elemList = str.split(str.strip(line), " ")
self.nodeIdList = list(map(int, elemList))
def getIndexMapList(self):
indexMapList = list(range(0, len(self.nodeIdList)))
if (len(self.nodeIdList) == 4):
indexMapList = [0, 1, 3, 2]
if (len(self.nodeIdList) == 8):
indexMapList = [0, 1, 3, 2, 4, 5, 7, 6]
return indexMapList
def getNumNodes(self):
return len(self.nodeIdList)
def getVtkCellType(self):
return numNodesVtkCellTypeDict[self.getNumNodes()]
def writeNodeIdList(self, f):
nodeIdList = [self.nodeIdList[i] for i in self.getIndexMapList()]
f.write(str.join("", (map(str, nodeIdList))))
class NodeList:
def __init__(self):
self.f = None
self.nodeList = []
def __len__(self):
return len(self.nodeList)
def __getitem__(self, i):
return self.nodeList[i]
def __setitem__(self, i, node):
self.nodeList[i] = node
def findMatch(self, regExprString):
return findFileMatch(regExprString, self.f)
def getDim(self):
return self.dim
def findNodes(self):
match = self.findMatch("^(\d)D-Nodes\s*(\d*)")
if (match != None):
self.dim = int(match.group(1))
self.numNodes = int(match.group(2))
else:
raise ParseError("No nodes header found in file " + self.fileName)
def append(self, node):
self.nodeList.append(node)
def readNodes(self):
self.findNodes()
for i in range(0, self.numNodes):
self.append(Node(self.f.readline()))
def read(self, f):
self.f = f
self.readNodes()
self.f = None
def writeVtkPointsDataArray(self, f):
f.write("<DataArray NumberOfComponents=\"{0:d}\" type=\"Float32\" format=\"ascii\">\n".format(3))
for node in self.nodeList:
node.writePt(f)
f.write("\n")
f.write("</DataArray>\n")
class CellList:
def __init__(self):
self.f = None
self.cellType = None
self.nodesPerCell = None
self.cellList = []
def append(self, cell):
self.cellList.append(cell)
def __len__(self):
return len(self.cellList)
def __getitem__(self, i):
return self.cellList[i]
def __setitem__(self, i, cell):
self.cellList[i] = cell
def findCells(self):
match = findFileMatch("^(\D+)(\d+)\s*(\d+)", self.f)
if (match != None):
self.cellType = match.group(1)
self.nodesPerCell = int(match.group(2))
self.numCells = int(match.group(3))
else:
raise ParseError("No cells header found in file " + self.fileName)
def append(self, cell):
self.cellList.append(cell)
def readCells(self):
self.findCells()
for i in range(0, self.numCells):
self.append(Cell(self.f.readline()))
def read(self, f):
self.f = f
self.readCells()
self.f = None
def writeVtkCellsDataArray(self, f):
self.writeVtkConnectivity(f)
self.writeVtkOffsets(f)
self.writeVtkTypes(f)
def writeVtkConnectivity(self, f):
f.write(
"<DataArray NumberOfComponents=\"1\"" +\
" type=\"Int32\" Name=\"connectivity\"" +\
" format=\"ascii\">\n"
)
for cell in self.cellList:
cell.writeNodeIdList(f)
f.write("\n")
f.write("</DataArray>\n")
def writeVtkOffsets(self, f):
f.write(
"<DataArray NumberOfComponents=\"1\"" +\
" type=\"Int32\" Name=\"offsets\"" +\
" format=\"ascii\">\n"
)
offset = 0
for cell in self.cellList:
offset += cell.getNumNodes()
f.write(str(offset))
f.write("\n")
f.write("</DataArray>\n")
def getVtkCellType(self):
if (self.cellType == "Line"):
return VTK_LINE
elif (self.cellType == "Rec"):
return VTK_PIXEL
elif (self.cellType == "Hex"):
return VTK_VOXEL
def writeVtkTypes(self, f):
f.write(
"<DataArray NumberOfComponents=\"1\"" +\
" type=\"Int32\" Name=\"types\"" +\
" format=\"ascii\">\n"
)
for cell in self.cellList:
f.write(str(cell.getVtkCellType()))
f.write("\n")
f.write("</DataArray>\n")
class UnstructuredGrid:
def __init__(self, nodeList, cellList):
self.nodeList = nodeList
self.cellList = cellList
def getNumNodes(self):
return len(self.nodeList)
def getNumCells(self):
return len(self.cellList)
def writeVtkXml(self, fileName):
f = file(fileName, "w")
f.write("<?xml version=\"1.0\"?>\n")
f.write("<VTKFile type=\"UnstructuredGrid\" version=\"0.1\">\n")
f.write("<UnstructuredGrid>\n")
f.write(
"<Piece NumberOfPoints=\"{0:d}\" NumberOfCells=\"{1:d}\">\n"\
.format(self.getNumNodes(), self.getNumCells())
)
f.write("<Points>\n")
self.nodeList.writeVtkPointsDataArray(f)
f.write("</Points>\n")
f.write("<PointData>\n")
f.write("</PointData>\n")
f.write("<Cells>\n")
self.cellList.writeVtkCellsDataArray(f)
f.write("</Cells>\n")
f.write("<CellData>\n")
f.write("</CellData>\n")
f.write("</Piece>\n")
f.write("</UnstructuredGrid>\n")
f.write("</VTKFile>\n")
class MeshReader:
def __init__(self, fileName):
self.fileName = fileName
self.f = None
self.dim = None
self.nodeList = NodeList()
self.cellList = CellList()
self.bndryCellList = CellList()
def getNumNodes(self):
return len(self.nodeList)
def getNumCells(self):
return len(self.cellList)
def getNumBndryCells(self):
return len(self.bndryCellList)
def read(self):
self.f = file(self.fileName, "r")
self.nodeList.read(self.f)
self.cellList.read(self.f)
self.bndryCellList.read(self.f)
self.f.close()
self.f = None
def writeVtkXml(self, fileName):
UnstructuredGrid(self.nodeList, self.cellList).writeVtkXml(fileName)
class MeshToVtkConverter:
def __init__(self, meshFileName, vtkXmlFileName):
self.meshFileName = meshFileName
self.vtkXmlFileName = vtkXmlFileName
def convert(self):
meshData = MeshReader(self.meshFileName)
meshData.read()
meshData.writeVtkXml(self.vtkXmlFileName)
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