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#!/usr/bin/env python
## Program: VMTK
## Module: $RCSfile: vmtkdijkstradistancetopoints.py,v $
## Language: Python
## Date: $$
## Version: $$
## Copyright (c) Luca Antiga, David Steinman. All rights reserved.
## See LICENCE file for details.
## This software is distributed WITHOUT ANY WARRANTY; without even
## the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
## PURPOSE. See the above copyright notices for more information.
## Note: this class was contributed by
## Tangui Morvan
## Kalkulo AS
## Simula Research Laboratory
## This class computes the geodesic distance on the graph of a surface
## from a set of user-selected points on the surface using the Dijkstra algorithm.
import vtk
import sys
import vtkvmtk
import vtkvmtkcontrib
import vmtkrenderer
import pypes
vmtkdijkstradistancetopoints = 'vmtkDijkstraDistanceToPoints'
class vmtkDijkstraDistanceToPoints(pypes.pypeScript):
def __init__(self):
pypes.pypeScript.__init__(self)
self.Surface = None
self.DijkstraDistanceToPointsArrayName = 'DijkstraDistanceToPoints'
self.DistanceOffset = 0.
self.DistanceScale = 1.
self.MinDistance = 0.
self.MaxDistance = -1.
self.SeedPoints = vtk.vtkPolyData()
self.SeedIds = vtk.vtkIdList()
self.vmtkRenderer = None
self.OwnRenderer = 0
self.DisplayArray = False
self.SurfaceMapper = None
self.Opacity = 1.
self.PointActor = None
self.ScalarBarActor = None
self.InteractionMode = 0
self.ExamineSurface = None
self.ExamineSpheres = vtk.vtkPolyData()
self.ExamineSpheresActor = None
self.ExamineText = None
self.SetScriptName('vmtkdijkstradistancetopoints')
self.SetInputMembers([
['Surface','i','vtkPolyData',1,'','the input surface','vmtksurfacereader'],
['DijkstraDistanceToPointsArrayName','distancetopointsarray','str',1,'','array storing the distances'],
['DistanceOffset','offset','float',1,'','offset added to the distances'],
['DistanceScale','scale','float',1,'','scale applied to the distances'],
['MinDistance','mindistance','float',1,'','minimum value for the distances'],
['MaxDistance','maxdistance','float',1,'','maximum value for the distances'],
['Opacity','opacity','float',1,'(0.0,1.0)','object opacities in the scene'],
['vmtkRenderer','renderer','vmtkRenderer',1,'','external renderer']
])
self.SetOutputMembers([
['Surface','o','vtkPolyData',1,'','','vmtksurfacewriter']
])
def DistanceParametersValidator(self,text):
if not text:
return 1
splitText = text.strip().split(' ')
if len(splitText) not in range(1,5):
return 0
try:
for i in range(1,len(splitText)+1):
float(splitText[i-1])
except ValueError:
return 0
return 1
def ComputeDistances(self):
dijkstraFilter = vtkvmtkcontrib.vtkvmtkPolyDataDijkstraDistanceToPoints()
dijkstraFilter.SetInput(self.Surface)
dijkstraFilter.SetSeedIds(self.SeedIds)
dijkstraFilter.SetDistanceOffset(self.DistanceOffset)
dijkstraFilter.SetDistanceScale(self.DistanceScale)
dijkstraFilter.SetMinDistance(self.MinDistance)
dijkstraFilter.SetMaxDistance(self.MaxDistance)
dijkstraFilter.SetDijkstraDistanceToPointsArrayName(self.DijkstraDistanceToPointsArrayName)
dijkstraFilter.Update()
return dijkstraFilter.GetOutput()
def InitializeSeeds(self):
if (self.InteractionMode==0):
self.SeedIds.Initialize()
self.SeedPoints.Initialize()
seedPoints = vtk.vtkPoints()
self.SeedPoints.SetPoints(seedPoints)
else:
self.ExamineSpheres.Initialize()
spherePoints = vtk.vtkPoints()
self.ExamineSpheres.SetPoints(spherePoints)
self.ExamineSpheres.GetPointData().Initialize()
sphereRadii = vtk.vtkDoubleArray()
self.ExamineSpheres.GetPointData().SetScalars(sphereRadii)
def UndoCallback(self, obj):
self.InitializeSeeds()
self.SeedPoints.Modified()
self.vmtkRenderer.RenderWindow.Render()
def SpaceCallback(self,obj):
picker = vtk.vtkCellPicker()
picker.SetTolerance(1E-4 * self.Surface.GetLength())
eventPosition = self.vmtkRenderer.RenderWindowInteractor.GetEventPosition()
#eventPosition = obj.GetEventPosition()
result = picker.Pick(float(eventPosition[0]),float(eventPosition[1]),0.0,self.vmtkRenderer.Renderer)
if result == 0:
return
pickPosition = picker.GetPickPosition()
pickedCellPointIds = self.Surface.GetCell(picker.GetCellId()).GetPointIds()
minDistance = 1E10
pickedSeedId = -1
for i in range(pickedCellPointIds.GetNumberOfIds()):
distance = vtk.vtkMath.Distance2BetweenPoints(pickPosition,self.Surface.GetPoint(pickedCellPointIds.GetId(i)))
if distance < minDistance:
minDistance = distance
pickedSeedId = pickedCellPointIds.GetId(i)
if pickedSeedId == -1:
pickedSeedId = pickedCellPointIds.GetId(0)
if (self.InteractionMode==0):
self.SeedIds.InsertNextId(pickedSeedId)
point = self.Surface.GetPoint(pickedSeedId)
self.SeedPoints.GetPoints().InsertNextPoint(point)
self.SeedPoints.Modified()
else:
point = self.Surface.GetPoint(pickedSeedId)
self.ExamineSpheres.GetPoints().InsertNextPoint(point)
length = 0.
array = self.ExamineSurface.GetPointData().GetArray(self.DijkstraDistanceToPointsArrayName)
if array:
length = array.GetComponent(pickedSeedId,0)
self.ExamineSpheres.GetPointData().GetScalars().InsertNextValue(length)
self.ExamineSpheres.Modified()
self.vmtkRenderer.RenderWindow.Render()
def DisplayDistanceCallback(self,obj):
self.DisplayArray = not self.DisplayArray
if self.DisplayArray:
newSurface = self.ComputeDistances()
self.SurfaceMapper.SetInput(newSurface)
newSurface.GetPointData().SetActiveScalars(self.DijkstraDistanceToPointsArrayName)
array = newSurface.GetPointData().GetScalars()
if array:
self.SurfaceMapper.SetScalarRange(array.GetRange(0))
self.ScalarBarActor.VisibilityOn()
else:
self.SurfaceMapper.SetInput(self.Surface)
self.ScalarBarActor.VisibilityOff()
self.SurfaceMapper.SetScalarVisibility(self.DisplayArray)
self.vmtkRenderer.RenderWindow.Render()
def AddCallback(self, obj):
queryString = 'Please input new parameters :\nDistanceOffset('+str(self.DistanceOffset)+') [DistanceScale('+str(self.DistanceScale)+') MinDistance('+str(self.MinDistance)+') MaxDistance('+str(self.MaxDistance)+'): '
inputString = self.InputText(queryString,self.DistanceParametersValidator)
splitInputString = inputString.strip().split(' ')
if len(splitInputString) >= 1 and splitInputString[0] != '':
self.DistanceOffset = float(splitInputString[0])
if len(splitInputString) >= 2:
self.DistanceScale = float(splitInputString[1])
if len(splitInputString) >= 3:
self.MinDistance = float(splitInputString[2])
if len(splitInputString) >= 4:
self.MaxDistance = float(splitInputString[3])
def ExamineCallback(self, obj):
#Switch beetween examien and interact mode
if self.InteractionMode == 0:
self.InteractionMode = 1
self.ExamineSurface = self.ComputeDistances()
self.PointActor.VisibilityOff()
self.ExamineSpheresActor.VisibilityOn()
self.ExamineText.VisibilityOn()
self.InitializeSeeds()
else:
self.InteractionMode = 0
#Compute the distances
self.PointActor.VisibilityOn()
self.ExamineSpheresActor.VisibilityOff()
self.ExamineText.VisibilityOff()
self.vmtkRenderer.RenderWindow.Render()
def Execute(self):
if self.Surface == None:
self.PrintError('Error: No input surface.')
if not self.vmtkRenderer:
self.vmtkRenderer = vmtkrenderer.vmtkRenderer()
self.vmtkRenderer.Initialize()
self.OwnRenderer = 1
self.vmtkRenderer.RegisterScript(self)
glyphs = vtk.vtkGlyph3D()
glyphSource = vtk.vtkSphereSource()
glyphSource.SetRadius(1)
glyphs.SetInput(self.SeedPoints)
glyphs.SetSource(glyphSource.GetOutput())
glyphs.SetScaleModeToDataScalingOff()
glyphs.SetScaleFactor(self.Surface.GetLength()*0.01)
glyphMapper = vtk.vtkPolyDataMapper()
glyphMapper.SetInput(glyphs.GetOutput())
glyphMapper.ScalarVisibilityOff()
self.PointActor = vtk.vtkActor()
self.PointActor.SetMapper(glyphMapper)
self.PointActor.GetProperty().SetColor(1.0,0.0,0.0)
self.PointActor.GetProperty().SetOpacity(self.Opacity)
self.PointActor.PickableOff()
self.vmtkRenderer.Renderer.AddActor(self.PointActor)
examineGlyphs = vtk.vtkGlyph3D()
examineGlyphSource = vtk.vtkSphereSource()
examineGlyphSource.SetRadius(1)
examineGlyphs.SetInput(self.ExamineSpheres)
examineGlyphs.SetSource(examineGlyphSource.GetOutput())
examineGlyphs.SetScaleModeToScaleByScalar()
examineGlyphs.SetScaleFactor(1.)
examineGlyphMapper = vtk.vtkPolyDataMapper()
examineGlyphMapper.SetInput(examineGlyphs.GetOutput())
examineGlyphMapper.ScalarVisibilityOff()
self.ExamineSpheresActor = vtk.vtkActor()
self.ExamineSpheresActor.SetMapper(examineGlyphMapper)
self.ExamineSpheresActor.GetProperty().SetColor(0.0,1.0,0.0)
self.ExamineSpheresActor.GetProperty().SetOpacity(self.Opacity)
self.ExamineSpheresActor.PickableOff()
self.ExamineSpheresActor.VisibilityOff()
self.vmtkRenderer.Renderer.AddActor(self.ExamineSpheresActor)
#self.vmtkRenderer.RenderWindowInteractor.AddObserver("KeyPressEvent", self.KeyPressed)
self.vmtkRenderer.AddKeyBinding('u','Undo.',self.UndoCallback)
self.vmtkRenderer.AddKeyBinding('space','Pick points.',self.SpaceCallback)
self.vmtkRenderer.AddKeyBinding('w','Examine mode.',self.ExamineCallback)
self.vmtkRenderer.AddKeyBinding('d','Display Distance.',self.DisplayDistanceCallback)
self.vmtkRenderer.AddKeyBinding('a','Add.',self.AddCallback)
self.SurfaceMapper = vtk.vtkPolyDataMapper()
self.SurfaceMapper.SetInput(self.Surface)
self.SurfaceMapper.SetScalarVisibility(self.DisplayArray)
surfaceActor = vtk.vtkActor()
surfaceActor.SetMapper(self.SurfaceMapper)
surfaceActor.GetProperty().SetOpacity(self.Opacity)
self.vmtkRenderer.Renderer.AddActor(surfaceActor)
self.ScalarBarActor = vtk.vtkScalarBarActor()
self.ScalarBarActor.SetLookupTable(self.SurfaceMapper.GetLookupTable())
self.ScalarBarActor.GetLabelTextProperty().ItalicOff()
self.ScalarBarActor.GetLabelTextProperty().BoldOff()
self.ScalarBarActor.GetLabelTextProperty().ShadowOff()
self.ScalarBarActor.SetLabelFormat('%.2f')
self.ScalarBarActor.SetTitle('distances')
self.ScalarBarActor.VisibilityOff()
self.vmtkRenderer.Renderer.AddActor(self.ScalarBarActor)
self.ExamineText = vtk.vtkTextActor()
self.ExamineText.SetInput("Examine Mode")
self.ExamineText.GetPositionCoordinate().SetCoordinateSystemToNormalizedViewport()
self.ExamineText.SetPosition(0.05,0.95)
self.ExamineText.VisibilityOff()
self.vmtkRenderer.Renderer.AddActor2D(self.ExamineText)
self.InputInfo('Please position the mouse and press space to add points, \'u\' to undo\n')
any = 0
while any == 0:
self.InitializeSeeds()
self.vmtkRenderer.Render()
any = self.SeedIds.GetNumberOfIds()
self.Surface = self.ComputeDistances()
if self.Surface.GetSource():
self.Surface.GetSource().UnRegisterAllOutputs()
if self.OwnRenderer:
self.vmtkRenderer.Deallocate()
if __name__=='__main__':
main = pypes.pypeMain()
main.Arguments = sys.argv
main.Execute()
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