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makevtu.py
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makevtu.py
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#!/usr/bin/python
import struct as st
import binascii as ba
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()