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import vtk
import sys
from math import sqrt
from xml.sax.handler import ContentHandler
from xml.sax.xmlreader import InputSource
from xml.sax import make_parser
def MakeDelaunConstr(mspts):
onepolylines = vtk.vtkCellArray()
onepolylines.InsertNextCell(mspts.GetNumberOfPoints())
# for i in range(mspts.GetNumberOfPoints()):
# onepolylines.InsertCellPoint(i)
# onepolylines.InsertCellPoint(0)
for i in range(mspts.GetNumberOfPoints()):
onepolylines.InsertCellPoint(mspts.GetNumberOfPoints() - 1 - i)
# onepolylines.InsertCellPoint(mspts.GetNumberOfPoints() - 1)
onepoly = vtk.vtkPolyData()
onepoly.SetPoints(mspts)
onepoly.SetPolys(onepolylines)
delaun = vtk.vtkDelaunay2D()
delaun.SetInput(onepoly)
delaun.SetSource(onepoly)
print mspts.GetNumberOfPoints()
return delaun.GetOutput()
class CHandler(ContentHandler):
def __init__(self):
pass
def FindZ(self, x0, y0, z0, x1, y1, z1, x2, y2):
diffx10 = x1 - x0
diffx20 = x2 - x0
diffy10 = y1 - y0
diffy20 = y2 - y0
n = diffx10 * diffx20 + diffy10 * diffy20
d = diffx10 * diffx10 + diffy10 * diffy10
d = sqrt(d)
r = n / (d * d)
return (1.0 - r) * z0 + r * z1
def startElement(self, name, attrs):
output_function = getattr(self, "start_%s" % name, self.start_unkown_tag)
output_function(name, attrs)
def start_tunnelxpyvtk(self, name, attrs):
self.pyvtkareaIndex = -1
self.appendF = vtk.vtkAppendPolyData()
def start_pyvtkarea(self, name, attrs):
self.pyvtkareaIndex += 1
if self.pyvtkareaIndex % 100 == 0:
print "pyvtkareaIndex:%d" % self.pyvtkareaIndex
self.ms = vtk.vtkFloatArray()
self.mspts = vtk.vtkPoints()
self.ms.SetNumberOfComponents(3)
self.polygon = vtk.vtkPolygon()
def start_path(self, name, attrs):
self.Points = []
for attrName in attrs.keys():
if attrName == "zstart":
self.z0 = float(attrs.get(attrName))
elif attrName == "zend":
self.z1 = float(attrs.get(attrName))
elif attrName == "reversed":
self.reversed = int(attrs.get(attrName))
def start_pt(self, name, attrs):
for attrName in attrs.keys():
if attrName == "x":
self.x = float(attrs.get(attrName))
elif attrName == "y":
self.y = float(attrs.get(attrName))
self.Points.append([self.x,self.y])
def start_unkown_tag(self, name, attrs):
if name == None:
print "Warning:no name given for tag"
else:
print "start of unknown tag:%s" % name
for attrName in attrs.keys():
print "Attribute -- Name: %s Value: %s" % (attrName, attrs.get(attrName))
def endElement(self, name):
output_function = getattr(self, "end_%s" % name, self.end_unkown_tag)
output_function(name)
def end_pyvtkarea(self, name):
self.appendF.AddInput(MakeDelaunConstr(self.mspts))
return
polygon = self.polygon
polygon.GetPoints().SetData(self.ms)
n = polygon.GetPoints().GetNumberOfPoints()
ids = polygon.GetPointIds()
ids.SetNumberOfIds(n)
for i in range(n):
ids.SetId(i,i)
ids = vtk.vtkIdList()
polygon.Triangulate(ids)
numberOfIds = ids.GetNumberOfIds()
numberOfTriangles = numberOfIds / 3
if ids.GetNumberOfIds() != numberOfTriangles * 3:
print "id list should contain a multipul of 3 points"
cellArray = vtk.vtkCellArray()
for triIndex in range(numberOfTriangles):
a = ids.GetId(3 * triIndex)
b = ids.GetId(3 * triIndex + 1)
c = ids.GetId(3 * triIndex + 2)
cellArray.InsertNextCell(3)
cellArray.InsertCellPoint(a)
cellArray.InsertCellPoint(b)
cellArray.InsertCellPoint(c)
pD = vtk.vtkPolyData()
points = vtk.vtkPoints()
points.SetData(self.ms)
pD.SetPoints(points)
#pD.SetPoints(self.polygon.GetPoints())
pD.SetPolys(cellArray)
self.appendF.AddInput(pD)
def end_tunnelxpyvtk(self, name):
print "pyvtkareaIndex:%d" % self.pyvtkareaIndex
def end_path(self, name):
z0 = self.z0
z1 = self.z1
reversed = self.reversed
points = self.Points
if reversed == 1:
points.reverse()
tmp = z0
z0 = z1
z1 = z0
ptstart = points[0]
ptend = points[-1]
x0 = ptstart[0]
y0 = ptstart[1]
x1 = ptend[0]
y1 = ptend[1]
if x0 == x1 and y0 == y1 and z0 != z1:
print "the data is a bit nasty, but I shouldnt crash!"
for point in points[:-1]:
x2 = point[0]
y2 = point[1]
if z0 == z1:
z2 = z0
else:
z2 = self.FindZ(x0, y0, z0, x1, y1, z1, x2, y2)
self.ms.InsertNextTuple3(x2, y2, z2)
self.mspts.InsertNextPoint(x2, y2, z2)
#self.polygon.GetPoints().InsertNextPoint(x2, y2, z2)
def end_pt(self, name):
pass
def end_unkown_tag(self, name):
if name == None:
print "Warning:end of tag:no name given for tag"
else:
print "end of unknown tag:%s" % name
# the main part
xmlfilename = len(sys.argv) >= 2 and sys.argv[1] or 'forsimon.xml'
handler = CHandler()
xmlParser = make_parser()
xmlParser.setContentHandler(handler)
xmlParser.setErrorHandler(handler);
xmlParser.parse(InputSource(xmlfilename))
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(handler.appendF.GetOutput())
#######
if False:
ppp = [ (0, 0, 0), (0, 3, 0), (2, 3, 1), (3, 6, 1), (0, 6, 0), (0, 10, 0), (10, 10, 0), (10, 0, 0) ]
ppp.reverse()
#del ppp[1]
polylines = vtk.vtkCellArray()
pts = vtk.vtkPoints()
polylines.InsertNextCell(len(ppp) + 1)
i0 = -1
for p in ppp:
i = pts.InsertNextPoint(p[0], p[1], p[2])
if i0 == -1:
i0 = i
polylines.InsertCellPoint(i)
print i
polylines.InsertCellPoint(i0)
polyData = MakeDelaunConstr(pts)
mapMesh = vtk.vtkPolyDataMapper()
mapMesh.SetInput(MakeDelaunConstr(pts))
########
actor = vtk.vtkActor()
actor.SetMapper(mapper)
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
ren.AddActor(actor)
ren.SetBackground(0.1, 0.2, 0.4)
renWin.SetSize(500, 500)
cam1 = ren.GetActiveCamera()
cam1.Elevation(-30)
cam1.Roll(-20)
ren.ResetCameraClippingRange()
iren.Initialize()
renWin.Render()
iren.Start()
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