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#!/usr/bin/env python
## Program: VMTK
## Module: $RCSfile: vmtkimagelinetracer.py,v $
## Language: Python
## Date: $Date: 2006/05/26 12:35:13 $
## Version: $Revision: 1.9 $
## 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.
import vtk
import sys
import vtkvmtk
import vmtkrenderer
import pypes
vmtkimagelinetracer = 'vmtkImageLineTracer'
class vmtkImageLineTracer(pypes.pypeScript):
def __init__(self):
pypes.pypeScript.__init__(self)
self.Line = None
self.Axis = 2
self.AutoClose = 0
self.vmtkRenderer = None
self.OwnRenderer = 0
self.ImageTracerWidget = None
self.ImageActor = None
self.SliceVOI = [0,0,0,0,0,0]
self.Type = 'freehand'
self.Image = None
self.SetScriptName('vmtkimagelinetracer')
self.SetScriptDoc('interactively trace lines on 3D images; press n and p to move to the next and previous slice, respectively')
self.SetInputMembers([
['Image','i','vtkImageData',1,'','the input image','vmtkimagereader'],
['vmtkRenderer','renderer','vmtkRenderer',1,'','external renderer'],
['Axis','axis','int',1,'','id of the drawing plane normal'],
['AutoClose','autoclose','bool',1,'','toggle auto close line'],
['Type','type','str',1,'["freehand","contour"]','type of widget to use: freehand drawing or control point-based contour']
])
self.SetOutputMembers([
['Line','line','vtkPolyData',1,'','the output line','vmtksurfacewriter']
])
def NextCallback(self, obj):
if self.SliceVOI[self.Axis*2+1] < self.Image.GetWholeExtent()[self.Axis*2+1]:
self.SliceVOI[self.Axis*2+1] += 1
self.SliceVOI[self.Axis*2] = self.SliceVOI[self.Axis*2+1]
origin = self.Image.GetOrigin()
spacing = self.Image.GetSpacing()
newOrigin = [origin[0], origin[1], origin[2]]
newOrigin[self.Axis] = origin[self.Axis]-spacing[self.Axis]
self.Image.SetOrigin(newOrigin)
self.ImageActor.SetDisplayExtent(self.SliceVOI)
obj.Render()
def PreviousCallback(self, obj):
if self.SliceVOI[self.Axis*2] > self.Image.GetWholeExtent()[self.Axis*2]:
self.SliceVOI[self.Axis*2] -= 1
self.SliceVOI[self.Axis*2+1] = self.SliceVOI[self.Axis*2]
origin = self.Image.GetOrigin()
spacing = self.Image.GetSpacing()
newOrigin = [origin[0], origin[1], origin[2]]
newOrigin[self.Axis] = origin[self.Axis]+spacing[self.Axis]
self.Image.SetOrigin(newOrigin)
self.ImageActor.SetDisplayExtent(self.SliceVOI)
obj.Render()
def InteractCallback(self):
if self.BoxWidget.GetEnabled() == 1:
self.BoxWidget.SetEnabled(0)
else:
self.BoxWidget.SetEnabled(1)
def SetWidgetProjectionPosition(self,obj,event):
self.ImageTracerWidget.SetProjectionPosition(self.SliceVOI[self.Axis*2]*self.Image.GetSpacing()[self.Axis]+self.Image.GetOrigin()[self.Axis])
self.vmtkRenderer.Renderer.Render()
def GetLineFromWidget(self,obj,event):
if self.Type == 'freehand':
path = vtk.vtkPolyData()
obj.GetPath(path)
elif self.Type == 'contour':
path = self.ImageTracerWidget.GetRepresentation().GetContourRepresentationAsPolyData()
spacing = self.Image.GetSpacing()
translation = [0.0,0.0,0.0]
translation[self.Axis] = self.SliceVOI[self.Axis*2]*spacing[self.Axis]
transform = vtk.vtkTransform()
transform.Translate(translation)
pathTransform = vtk.vtkTransformPolyDataFilter()
pathTransform.SetInput(path)
pathTransform.SetTransform(transform)
pathTransform.Update()
self.Line = pathTransform.GetOutput()
if self.Line.GetSource():
self.Line.GetSource().UnRegisterAllOutputs()
def ChangeSlice(self,obj,event):
currentSlice = self.SliceVOI[self.Axis*2]
slice = int(self.SliderWidget.GetRepresentation().GetValue())
self.SliceVOI[self.Axis*2] = slice
self.SliceVOI[self.Axis*2+1] = slice
origin = self.Image.GetOrigin()
spacing = self.Image.GetSpacing()
newOrigin = [origin[0], origin[1], origin[2]]
newOrigin[self.Axis] = origin[self.Axis] - (slice - currentSlice) * spacing[self.Axis]
self.Image.SetOrigin(newOrigin)
self.ImageActor.SetDisplayExtent(self.SliceVOI)
self.vmtkRenderer.Renderer.Render()
def Display(self):
wholeExtent = self.Image.GetExtent()
self.SliceVOI[0] = wholeExtent[0]
self.SliceVOI[1] = wholeExtent[1]
self.SliceVOI[2] = wholeExtent[2]
self.SliceVOI[3] = wholeExtent[3]
self.SliceVOI[4] = wholeExtent[4]
self.SliceVOI[5] = wholeExtent[5]
self.SliceVOI[self.Axis*2] = wholeExtent[self.Axis*2]
self.SliceVOI[self.Axis*2+1] = wholeExtent[self.Axis*2]
range = self.Image.GetScalarRange()
imageShifter = vtk.vtkImageShiftScale()
imageShifter.SetInput(self.Image)
imageShifter.SetShift(-1.0*range[0])
imageShifter.SetScale(255.0/(range[1]-range[0]))
imageShifter.SetOutputScalarTypeToUnsignedChar()
widgetImage = imageShifter.GetOutput()
self.ImageActor.SetInput(widgetImage)
self.ImageActor.SetDisplayExtent(self.SliceVOI)
self.vmtkRenderer.Renderer.AddActor(self.ImageActor)
if self.Type == 'freehand':
self.ImageTracerWidget.SetCaptureRadius(1.5)
self.ImageTracerWidget.SetViewProp(self.ImageActor)
self.ImageTracerWidget.SetInput(widgetImage)
self.ImageTracerWidget.ProjectToPlaneOn()
self.ImageTracerWidget.SetProjectionNormal(self.Axis)
self.ImageTracerWidget.PlaceWidget()
self.ImageTracerWidget.SetAutoClose(self.AutoClose)
self.ImageTracerWidget.AddObserver("StartInteractionEvent",self.SetWidgetProjectionPosition)
self.ImageTracerWidget.AddObserver("EndInteractionEvent",self.GetLineFromWidget)
elif self.Type == 'contour':
self.ImageTracerWidget.AddObserver("EndInteractionEvent",self.GetLineFromWidget)
self.ImageTracerWidget.ContinuousDrawOff()
sliderRep = vtk.vtkSliderRepresentation2D()
sliderRep.SetValue(0.5*(wholeExtent[self.Axis*2]+wholeExtent[self.Axis*2+1]))
sliderRep.SetMinimumValue(wholeExtent[self.Axis*2])
sliderRep.SetMaximumValue(wholeExtent[self.Axis*2+1])
sliderRep.SetTitleText("Slice")
sliderRep.GetPoint1Coordinate().SetCoordinateSystemToNormalizedDisplay()
sliderRep.GetPoint1Coordinate().SetValue(0.2,0.9)
sliderRep.GetPoint2Coordinate().SetCoordinateSystemToNormalizedDisplay()
sliderRep.GetPoint2Coordinate().SetValue(0.8,0.9)
sliderRep.SetSliderLength(0.02)
sliderRep.SetSliderWidth(0.03)
sliderRep.SetEndCapLength(0.01)
sliderRep.SetEndCapWidth(0.03)
sliderRep.SetTubeWidth(0.005)
sliderRep.SetLabelFormat("%.0f")
self.SliderWidget.AddObserver("InteractionEvent",self.ChangeSlice)
self.SliderWidget.SetRepresentation(sliderRep)
self.SliderWidget.EnabledOn()
interactorStyle = vtk.vtkInteractorStyleImage()
self.vmtkRenderer.RenderWindowInteractor.SetInteractorStyle(interactorStyle)
self.vmtkRenderer.Render()
def Execute(self):
if self.Image == None:
self.PrintError('Error: no Image.')
if not self.vmtkRenderer:
self.vmtkRenderer = vmtkrenderer.vmtkRenderer()
self.vmtkRenderer.Initialize()
self.OwnRenderer = 1
self.vmtkRenderer.RegisterScript(self)
if self.Type == 'freehand':
self.ImageTracerWidget = vtk.vtkImageTracerWidget()
elif self.Type == 'contour':
self.ImageTracerWidget = vtk.vtkContourWidget()
self.ImageTracerWidget.SetInteractor(self.vmtkRenderer.RenderWindowInteractor)
self.SliderWidget = vtk.vtkSliderWidget()
self.SliderWidget.SetInteractor(self.vmtkRenderer.RenderWindowInteractor)
self.ImageActor = vtk.vtkImageActor()
self.vmtkRenderer.AddKeyBinding('n','Next.',self.NextCallback)
self.vmtkRenderer.AddKeyBinding('p','Previous.',self.PreviousCallback)
self.vmtkRenderer.AddKeyBinding('i','Interact.', self.InteractCallback)
self.Display()
if self.OwnRenderer:
self.vmtkRenderer.Deallocate()
if __name__=='__main__':
main = pypes.pypeMain()
main.Arguments = sys.argv
main.Execute()
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