import xml.etree.cElementTree as ET



def write_line_VTU(nodes,elements,filename):
	file=ET.Element("VTKFile")
	file.set('type','UnstructuredGrid')
	file.set('version','0.1')
	file.set('byte_order','BigEndian')
	UG=ET.SubElement(file,'UnstructuredGrid')
	piece=ET.SubElement(UG,'Piece')
	piece.set('NumberOfPoints',str(len(nodes)))
	piece.set('NumberOfCells',str(len(elements)))
#	pointdata=ET.SubElement(piece,'PointData')
#	pointdata.set('Scalars','scalars')
#	DApd=ET.SubElement(pointdata,'DataArray')
#	DApd.set('type','Float32')
#	DApd.set('Name','phi')
#	DApd.set('Format','ascii')
#	DApd.text=''
	points=ET.SubElement(piece,'Points')
	DAp=ET.SubElement(points,'DataArray')
	DAp.set('type','Float32')
	DAp.set('NumberOfComponents','3')
	DAp.set('Format','ascii')
	DAp.text=''
	print "node string start"
	DAp.text='\n'.join(map(lambda a: str(a[0])+' '+str(a[1])+' '+str(a[2]), nodes))
	print 'node string end'
#	DApd.text='\n'.join(map(str,NT11.values()))
	cell=ET.SubElement(piece,'Cells')
	DAc=ET.SubElement(cell,'DataArray')
	DAc.set('type','Int32')
	DAc.set('Name','connectivity')
	DAc.set('Format','ascii')
	DAc2=ET.SubElement(cell,'DataArray')
	DAc2.set('Name','types')
	DAc2.set('Format','ascii')
	DAc2.set('type','Int32')
	DAc3=ET.SubElement(cell,'DataArray')
	DAc3.set('Name','types')
	DAc3.set('type','Int32')
	DAc3.set('Format','ascii')
	DAc3.set('Name','offsets')
	DAc.text=''
	DAc2.text=''
	DAc3.text=''
	DAc.text='\n'.join(map(lambda a: str(a[0])+' '+str(a[1]), elements))
	DAc2.text='\n'.join(['3']*len(elements))
	DAc3.text='\n'.join(map(str,range(2,len(elements)*2+1,2)))
	tree = ET.ElementTree(file)
	tree.write(filename)
	return