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makevtu.py
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makevtu.py
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#!/usr/bin/python
import binascii as ba
import struct as st
FOUT = "vtutest.vtu"
def main():
try:
fout = open(FOUT, "wb")
except:
exit("Couldn't create file...")
writeHeader(fout, 4, 1)
lP = [0, 0, 0, 2, 0, 0, 0, 0, 2, 1, 1, 1]
writePoints(fout, lP)
lConn = [0, 1, 2, 3]
lOffset = [4]
lTypes = [10]
writeCells(fout, lConn, lOffset, lTypes)
lldata = []
lldata.append(["Scalars", 1, 2, -1, 0.5])
lldata.append(["OtherSet", 1.0, 2, 3, 127.3])
writeScalarPointData(fout, lldata)
lldata = []
lldata.append(["Scalars", 1.0])
lldata.append(["Scalars2", 27.0])
writeScalarCellData(fout, lldata)
writeFooter(fout)
fout.close()
# nP = number of points, nC = number of cells
def writeHeader(fout, nP, nC):
fout.write('<?xml version="1.0"?>\n')
fout.write(
'<VTKFile type="UnstructuredGrid" version="1.0" header_type="UInt64" byte_order="LittleEndian">\n'
)
fout.write("<UnstructuredGrid>\n")
fout.write(
'\t<Piece NumberOfPoints="' + str(nP) + '" NumberOfCells="' + str(nC) + '">\n'
)
def writeFooter(fout):
fout.write("\t</Piece>\n")
fout.write("</UnstructuredGrid>\n")
fout.write("</VTKFile>")
def writeRawPoints(fout, data):
fout.write("\t\t<Points>\n")
fout.write(
'\t\t\t<DataArray type="Float32" NumberOfComponents="3" format="binary">\n'
)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</Points>\n")
# lP = list of points
# 3D coordinates assumed...
def writePoints(fout, lP):
fout.write("\t\t<Points>\n")
fout.write(
'\t\t\t<DataArray type="Float32" NumberOfComponents="3" format="binary">\n'
)
data = ""
for number in lP:
# Append number to binary datalist
data += st.pack("f", number)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</Points>\n")
# lConn = connectivity list
# lOffset = Offset list
def writeCells(fout, lConn, lOffset, lTypes):
fout.write("\t\t<Cells>\n")
fout.write('\t\t\t<DataArray type="UInt32" Name="connectivity" format="binary">\n')
data = ""
for number in lConn:
data += st.pack("I", number)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write('\t\t\t<DataArray type="UInt32" Name="offsets" format="binary">\n')
data = ""
for number in lOffset:
data += st.pack("I", number)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
# Data type could be UInt8 instead, but UInt32 keeps it simple for now...
fout.write('\t\t\t<DataArray type="UInt32" Name="types" format="binary">\n')
data = ""
for number in lTypes:
data += st.pack("I", number)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</Cells>")
def writeRawCellsConn(fout, data):
fout.write("\t\t<Cells>\n")
fout.write('\t\t\t<DataArray type="UInt64" Name="connectivity" format="binary">\n')
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
def writeRawCellsOffset(fout, data):
fout.write('\t\t\t<DataArray type="UInt64" Name="offsets" format="binary">\n')
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
def writeRawCellsType(fout, data):
fout.write('\t\t\t<DataArray type="UInt64" Name="types" format="binary">\n')
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</Cells>")
# Returns Int containing data size + data
# everything in base64 encoding
def writeBin64(bindata):
datalen = st.pack("Q", len(bindata))
# Note that \n is removed from datalen
# - which btw is a ridiculous design choice
# as it makes the data size grow by 33% (4/3-1)
return ba.b2a_base64(datalen)[0:-1] + ba.b2a_base64(bindata)
##lldata = list of list of data (where 1st entry is set name)
def writeScalarPointData(fout, lldata):
fout.write('\t\t<PointData Scalars="scalars">\n')
for ldata in lldata:
setname = ldata[0]
del ldata[0]
data = ""
for number in ldata:
data += st.pack("f", number)
fout.write(
'\t\t\t<DataArray type="Float32" Name="' + setname + '" format="binary">\n'
)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</PointData>\n")
def writeRawScalarPointData(fout, ldata, setnames):
fout.write('\t\t<PointData Scalars="scalars">\n')
j = -1
for data in ldata:
j = j + 1
fout.write(
'\t\t\t<DataArray type="Float32" Name="'
+ setnames[j]
+ '" format="binary">\n'
)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</PointData>\n")
def writeScalarCellData(fout, lldata):
fout.write('\t\t<CellData Scalars="scalars">\n')
for ldata in lldata:
setname = ldata[0]
del ldata[0]
data = ""
for number in ldata:
data += st.pack("f", number)
fout.write(
'\t\t\t<DataArray type="Float32" Name="' + setname + '" format="binary">\n'
)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</CellData>\n")
def writeRawScalarCellData(fout, ldata, setnames):
fout.write('\t\t<CellData Scalars="scalars">\n')
j = -1
for data in ldata:
j = j + 1
fout.write(
'\t\t\t<DataArray type="Float32" Name="'
+ setnames[j]
+ '" format="binary">\n'
)
fout.write(writeBin64(data))
fout.write("\t\t\t</DataArray>\n")
fout.write("\t\t</CellData>\n")
if __name__ == "__main__":
main()