added viewer for testing

11 files changed, 1987 insertions, 0 deletions

diff --git a/src/Python/ccpi/viewer/CILViewer.py b/src/Python/ccpi/viewer/CILViewer.py
new file mode 100644
index 0000000..efcf8be
--- /dev/null
+++ b/src/Python/ccpi/viewer/CILViewer.py
@@ -0,0 +1,361 @@
+# -*- coding: utf-8 -*-
+#   Copyright 2017 Edoardo Pasca
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+   
+import vtk
+import numpy
+import math
+from vtk.util import numpy_support
+
+SLICE_ORIENTATION_XY = 2 # Z
+SLICE_ORIENTATION_XZ = 1 # Y
+SLICE_ORIENTATION_YZ = 0 # X
+
+
+
+class CILViewer():
+    '''Simple 3D Viewer based on VTK classes'''
+    
+    def __init__(self, dimx=600,dimy=600):
+        '''creates the rendering pipeline'''
+        
+        # create a rendering window and renderer
+        self.ren = vtk.vtkRenderer()
+        self.renWin = vtk.vtkRenderWindow()
+        self.renWin.SetSize(dimx,dimy)
+        self.renWin.AddRenderer(self.ren)
+
+        # img 3D as slice
+        self.img3D = None
+        self.sliceno = 0
+        self.sliceOrientation = SLICE_ORIENTATION_XY
+        self.sliceActor = None
+        self.voi = None
+        self.wl = None
+        self.ia = None
+        self.sliceActorNo = 0
+        # create a renderwindowinteractor
+        self.iren = vtk.vtkRenderWindowInteractor()
+        self.iren.SetRenderWindow(self.renWin)
+
+        self.style = vtk.vtkInteractorStyleTrackballCamera()
+        self.iren.SetInteractorStyle(self.style)
+
+        self.ren.SetBackground(.1, .2, .4)
+
+        self.actors = {}
+        self.iren.RemoveObservers('MouseWheelForwardEvent')
+        self.iren.RemoveObservers('MouseWheelBackwardEvent')
+        
+        self.iren.AddObserver('MouseWheelForwardEvent', self.mouseInteraction, 1.0)
+        self.iren.AddObserver('MouseWheelBackwardEvent', self.mouseInteraction, 1.0)
+
+        self.iren.RemoveObservers('KeyPressEvent')
+        self.iren.AddObserver('KeyPressEvent', self.keyPress, 1.0)
+        
+        
+        self.iren.Initialize()
+
+        
+
+    def getRenderer(self):
+        '''returns the renderer'''
+        return self.ren
+
+    def getRenderWindow(self):
+        '''returns the render window'''
+        return self.renWin
+
+    def getInteractor(self):
+        '''returns the render window interactor'''
+        return self.iren
+
+    def getCamera(self):
+        '''returns the active camera'''
+        return self.ren.GetActiveCamera()
+
+    def createPolyDataActor(self, polydata):
+        '''returns an actor for a given polydata'''
+        mapper = vtk.vtkPolyDataMapper()
+        if vtk.VTK_MAJOR_VERSION <= 5:
+            mapper.SetInput(polydata)
+        else:
+            mapper.SetInputData(polydata)
+   
+        # actor
+        actor = vtk.vtkActor()
+        actor.SetMapper(mapper)
+        #actor.GetProperty().SetOpacity(0.8)
+        return actor
+
+    def setPolyDataActor(self, actor):
+        '''displays the given polydata'''
+        
+        self.ren.AddActor(actor)
+        
+        self.actors[len(self.actors)+1] = [actor, True]
+        self.iren.Initialize()
+        self.renWin.Render()
+
+    def displayPolyData(self, polydata):
+        self.setPolyDataActor(self.createPolyDataActor(polydata))
+        
+    def hideActor(self, actorno):
+        '''Hides an actor identified by its number in the list of actors'''
+        try:
+            if self.actors[actorno][1]:
+                self.ren.RemoveActor(self.actors[actorno][0])
+                self.actors[actorno][1] = False
+        except KeyError as ke:
+            print ("Warning Actor not present")
+        
+    def showActor(self, actorno, actor = None):
+        '''Shows hidden actor identified by its number in the list of actors'''
+        try:
+            if not self.actors[actorno][1]:
+                self.ren.AddActor(self.actors[actorno][0])
+                self.actors[actorno][1] = True
+                return actorno
+        except KeyError as ke:
+            # adds it to the actors if not there already
+            if actor != None:
+                self.ren.AddActor(actor)
+                self.actors[len(self.actors)+1] = [actor, True]
+                return len(self.actors)
+
+    def addActor(self, actor):
+        '''Adds an actor to the render'''
+        return self.showActor(0, actor)
+            
+        
+    def saveRender(self, filename, renWin=None):
+        '''Save the render window to PNG file'''
+        # screenshot code:
+        w2if = vtk.vtkWindowToImageFilter()
+        if renWin == None:
+            renWin = self.renWin
+        w2if.SetInput(renWin)
+        w2if.Update()
+         
+        writer = vtk.vtkPNGWriter()
+        writer.SetFileName("%s.png" % (filename))
+        writer.SetInputConnection(w2if.GetOutputPort())
+        writer.Write()
+
+    
+    def startRenderLoop(self):
+        self.iren.Start()
+
+
+    def setupObservers(self, interactor):
+        interactor.RemoveObservers('LeftButtonPressEvent')
+        interactor.AddObserver('LeftButtonPressEvent', self.mouseInteraction)
+        interactor.Initialize()
+
+        
+    def mouseInteraction(self, interactor, event):
+        if event == 'MouseWheelForwardEvent':
+            maxSlice = self.img3D.GetDimensions()[self.sliceOrientation]
+            if (self.sliceno + 1 < maxSlice):
+                self.hideActor(self.sliceActorNo)
+                self.sliceno = self.sliceno + 1
+                self.displaySliceActor(self.sliceno)
+        else:
+            minSlice = 0
+            if (self.sliceno - 1 > minSlice):
+                self.hideActor(self.sliceActorNo)
+                self.sliceno = self.sliceno - 1
+                self.displaySliceActor(self.sliceno)
+                 
+
+    def keyPress(self, interactor, event):
+        #print ("Pressed key %s" % interactor.GetKeyCode())
+        # Slice Orientation 
+        if interactor.GetKeyCode() == "x":
+            # slice on the other orientation
+            self.sliceOrientation = SLICE_ORIENTATION_YZ
+            self.sliceno = int(self.img3D.GetDimensions()[1] / 2)
+            self.hideActor(self.sliceActorNo)
+            self.displaySliceActor(self.sliceno)
+        elif interactor.GetKeyCode() == "y":
+            # slice on the other orientation
+            self.sliceOrientation = SLICE_ORIENTATION_XZ
+            self.sliceno = int(self.img3D.GetDimensions()[1] / 2)
+            self.hideActor(self.sliceActorNo)
+            self.displaySliceActor(self.sliceno)
+        elif interactor.GetKeyCode() == "z":
+            # slice on the other orientation
+            self.sliceOrientation = SLICE_ORIENTATION_XY
+            self.sliceno = int(self.img3D.GetDimensions()[2] / 2)
+            self.hideActor(self.sliceActorNo)
+            self.displaySliceActor(self.sliceno)
+        if interactor.GetKeyCode() == "X":
+            # Change the camera view point
+            camera = vtk.vtkCamera()
+            camera.SetFocalPoint(self.ren.GetActiveCamera().GetFocalPoint())
+            camera.SetViewUp(self.ren.GetActiveCamera().GetViewUp())
+            newposition = [i for i in self.ren.GetActiveCamera().GetFocalPoint()]
+            newposition[SLICE_ORIENTATION_YZ] = math.sqrt(newposition[SLICE_ORIENTATION_XY] ** 2 + newposition[SLICE_ORIENTATION_XZ] ** 2) 
+            camera.SetPosition(newposition)
+            camera.SetViewUp(0,0,-1)
+            self.ren.SetActiveCamera(camera)
+            self.ren.ResetCamera()
+            self.ren.Render()
+            interactor.SetKeyCode("x")
+            self.keyPress(interactor, event)
+        elif interactor.GetKeyCode() == "Y":
+             # Change the camera view point
+            camera = vtk.vtkCamera()
+            camera.SetFocalPoint(self.ren.GetActiveCamera().GetFocalPoint())
+            camera.SetViewUp(self.ren.GetActiveCamera().GetViewUp())
+            newposition = [i for i in self.ren.GetActiveCamera().GetFocalPoint()]
+            newposition[SLICE_ORIENTATION_XZ] = math.sqrt(newposition[SLICE_ORIENTATION_XY] ** 2 + newposition[SLICE_ORIENTATION_YZ] ** 2) 
+            camera.SetPosition(newposition)
+            camera.SetViewUp(0,0,-1)
+            self.ren.SetActiveCamera(camera)
+            self.ren.ResetCamera()
+            self.ren.Render()
+            interactor.SetKeyCode("y")
+            self.keyPress(interactor, event)
+        elif interactor.GetKeyCode() == "Z":
+             # Change the camera view point
+            camera = vtk.vtkCamera()
+            camera.SetFocalPoint(self.ren.GetActiveCamera().GetFocalPoint())
+            camera.SetViewUp(self.ren.GetActiveCamera().GetViewUp())
+            newposition = [i for i in self.ren.GetActiveCamera().GetFocalPoint()]
+            newposition[SLICE_ORIENTATION_XY] = math.sqrt(newposition[SLICE_ORIENTATION_YZ] ** 2 + newposition[SLICE_ORIENTATION_XZ] ** 2) 
+            camera.SetPosition(newposition)
+            camera.SetViewUp(0,0,-1)
+            self.ren.SetActiveCamera(camera)
+            self.ren.ResetCamera()
+            self.ren.Render()
+            interactor.SetKeyCode("z")
+            self.keyPress(interactor, event)
+        else :
+            print ("Unhandled event %s" % interactor.GetKeyCode())
+
+
+        
+    def setInput3DData(self, imageData):
+        self.img3D = imageData
+
+    def setInputAsNumpy(self, numpyarray):
+        if (len(numpy.shape(numpyarray)) == 3):
+            doubleImg = vtk.vtkImageData()
+            shape = numpy.shape(numpyarray)
+            doubleImg.SetDimensions(shape[0], shape[1], shape[2])
+            doubleImg.SetOrigin(0,0,0)
+            doubleImg.SetSpacing(1,1,1)
+            doubleImg.SetExtent(0, shape[0]-1, 0, shape[1]-1, 0, shape[2]-1)
+            #self.img3D.SetScalarType(vtk.VTK_UNSIGNED_SHORT, vtk.vtkInformation())
+            doubleImg.AllocateScalars(vtk.VTK_DOUBLE,1)
+            
+            for i in range(shape[0]):
+                for j in range(shape[1]):
+                    for k in range(shape[2]):
+                        doubleImg.SetScalarComponentFromDouble(
+                            i,j,k,0, numpyarray[i][j][k])
+        #self.setInput3DData( numpy_support.numpy_to_vtk(numpyarray) )
+            # rescale to appropriate VTK_UNSIGNED_SHORT
+            stats = vtk.vtkImageAccumulate()
+            stats.SetInputData(doubleImg)
+            stats.Update()
+            iMin = stats.GetMin()[0]
+            iMax = stats.GetMax()[0]
+            scale = vtk.VTK_UNSIGNED_SHORT_MAX / (iMax - iMin)
+
+            shiftScaler = vtk.vtkImageShiftScale ()
+            shiftScaler.SetInputData(doubleImg)
+            shiftScaler.SetScale(scale)
+            shiftScaler.SetShift(iMin)
+            shiftScaler.SetOutputScalarType(vtk.VTK_UNSIGNED_SHORT)
+            shiftScaler.Update()
+            self.img3D = shiftScaler.GetOutput()
+            
+    def displaySliceActor(self, sliceno = 0):
+        self.sliceno = sliceno
+        first = False
+        
+        self.sliceActor , self.voi, self.wl , self.ia = \
+                        self.getSliceActor(self.img3D,
+                                                 sliceno,
+                                                 self.sliceActor,
+                                                 self.voi,
+                                                 self.wl,
+                                                 self.ia)
+        no = self.showActor(self.sliceActorNo, self.sliceActor)
+        self.sliceActorNo = no
+        
+        self.iren.Initialize()
+        self.renWin.Render()
+        
+        return self.sliceActorNo
+
+                      
+    def getSliceActor(self,
+                      imageData ,
+                      sliceno=0,
+                      imageActor=None ,
+                      voi=None,
+                      windowLevel=None,
+                      imageAccumulate=None):
+        '''Slices a 3D volume and then creates an actor to be rendered'''
+        if (voi==None):
+            voi = vtk.vtkExtractVOI()
+            #voi = vtk.vtkImageClip()
+        voi.SetInputData(imageData)
+        #select one slice in Z
+        extent = [ i for i in self.img3D.GetExtent()]
+        extent[self.sliceOrientation * 2] = sliceno
+        extent[self.sliceOrientation * 2 + 1] = sliceno 
+        voi.SetVOI(extent[0], extent[1],
+                   extent[2], extent[3],
+                   extent[4], extent[5])
+        
+        voi.Update()
+        # set window/level for all slices
+        if imageAccumulate == None:
+            imageAccumulate = vtk.vtkImageAccumulate()
+        
+        if (windowLevel == None):
+            windowLevel = vtk.vtkImageMapToWindowLevelColors()
+            imageAccumulate.SetInputData(imageData)
+            imageAccumulate.Update()
+            cmax = imageAccumulate.GetMax()[0]
+            cmin = imageAccumulate.GetMin()[0]
+            windowLevel.SetLevel((cmax+cmin)/2)
+            windowLevel.SetWindow(cmax-cmin)
+
+        windowLevel.SetInputData(voi.GetOutput())
+        windowLevel.Update()
+            
+        if imageActor == None:
+            imageActor = vtk.vtkImageActor()
+        imageActor.SetInputData(windowLevel.GetOutput())
+        imageActor.SetDisplayExtent(extent[0], extent[1],
+                   extent[2], extent[3],
+                   extent[4], extent[5])
+        imageActor.Update()
+        return (imageActor , voi, windowLevel, imageAccumulate)
+
+
+    # Set interpolation on
+    def setInterpolateOn(self):
+        self.sliceActor.SetInterpolate(True)
+        self.renWin.Render()
+
+    # Set interpolation off
+    def setInterpolateOff(self):
+        self.sliceActor.SetInterpolate(False)
+        self.renWin.Render()
\ No newline at end of file
diff --git a/src/Python/ccpi/viewer/CILViewer2D.py b/src/Python/ccpi/viewer/CILViewer2D.py
new file mode 100644
index 0000000..c1629af
--- /dev/null
+++ b/src/Python/ccpi/viewer/CILViewer2D.py
@@ -0,0 +1,1126 @@
+# -*- coding: utf-8 -*-
+#   Copyright 2017 Edoardo Pasca
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+   
+import vtk
+import numpy
+from vtk.util import numpy_support , vtkImageImportFromArray
+from enum import Enum
+
+SLICE_ORIENTATION_XY = 2 # Z
+SLICE_ORIENTATION_XZ = 1 # Y
+SLICE_ORIENTATION_YZ = 0 # X
+
+CONTROL_KEY = 8
+SHIFT_KEY = 4
+ALT_KEY = -128
+
+
+# Converter class
+class Converter():
+    
+    # Utility functions to transform numpy arrays to vtkImageData and viceversa
+    @staticmethod
+    def numpy2vtkImporter(nparray, spacing=(1.,1.,1.), origin=(0,0,0)):
+        '''Creates a vtkImageImportFromArray object and returns it.
+        
+        It handles the different axis order from numpy to VTK'''
+        importer = vtkImageImportFromArray.vtkImageImportFromArray()
+        importer.SetArray(numpy.transpose(nparray).copy())
+        importer.SetDataSpacing(spacing)
+        importer.SetDataOrigin(origin)
+        return importer
+    
+    @staticmethod
+    def numpy2vtk(nparray, spacing=(1.,1.,1.), origin=(0,0,0)):
+        '''Converts a 3D numpy array to a vtkImageData'''
+        importer = Converter.numpy2vtkImporter(nparray, spacing, origin)
+        importer.Update()
+        return importer.GetOutput()
+    
+    @staticmethod
+    def vtk2numpy(imgdata):
+        '''Converts the VTK data to 3D numpy array'''
+        img_data = numpy_support.vtk_to_numpy(
+                imgdata.GetPointData().GetScalars())
+    
+        dims = imgdata.GetDimensions()
+        dims = (dims[2],dims[1],dims[0])
+        data3d = numpy.reshape(img_data, dims)
+        
+        return numpy.transpose(data3d).copy() 
+
+    @staticmethod
+    def tiffStack2numpy(filename, indices, 
+                        extent = None , sampleRate = None ,\
+                        flatField = None, darkField = None):
+        '''Converts a stack of TIFF files to numpy array.
+        
+        filename must contain the whole path. The filename is supposed to be named and
+        have a suffix with the ordinal file number, i.e. /path/to/projection_%03d.tif
+        
+        indices are the suffix, generally an increasing number
+        
+        Optionally extracts only a selection of the 2D images and (optionally)
+        normalizes.
+        '''
+        
+        stack = vtk.vtkImageData()
+        reader = vtk.vtkTIFFReader()
+        voi = vtk.vtkExtractVOI()
+        
+        #directory = "C:\\Users\\ofn77899\\Documents\\CCPi\\IMAT\\20170419_crabtomo\\crabtomo\\"
+        
+        stack_image = numpy.asarray([])
+        nreduced = len(indices)
+        
+        for num in range(len(indices)):
+            fn = filename % indices[num]
+            print ("resampling %s" % ( fn ) )
+            reader.SetFileName(fn)
+            reader.Update()     
+            print (reader.GetOutput().GetScalarTypeAsString())
+            if num == 0:
+                if (extent == None):
+                    sliced = reader.GetOutput().GetExtent()
+                    stack.SetExtent(sliced[0],sliced[1], sliced[2],sliced[3], 0, nreduced-1)
+                else:
+                    sliced = extent
+                    voi.SetVOI(extent)
+                   
+                    if sampleRate is not None:
+                        voi.SetSampleRate(sampleRate)
+                        ext = numpy.asarray([(sliced[2*i+1] - sliced[2*i])/sampleRate[i] for i in range(3)], dtype=int)
+                        print ("ext {0}".format(ext))
+                        stack.SetExtent(0, ext[0] , 0, ext[1], 0, nreduced-1)
+                    else:
+                         stack.SetExtent(0, sliced[1] - sliced[0] , 0, sliced[3]-sliced[2], 0, nreduced-1)
+                if (flatField != None and darkField != None):
+                    stack.AllocateScalars(vtk.VTK_FLOAT, 1)
+                else:
+                    stack.AllocateScalars(reader.GetOutput().GetScalarType(), 1)
+                print ("Image Size: %d" % ((sliced[1]+1)*(sliced[3]+1) ))
+                stack_image = Converter.vtk2numpy(stack)
+                print ("Stack shape %s" % str(numpy.shape(stack_image)))
+            
+            if extent!=None:
+                voi.SetInputData(reader.GetOutput())
+                voi.Update()
+                img = voi.GetOutput()
+            else:
+                img = reader.GetOutput()
+                
+            theSlice = Converter.vtk2numpy(img).T[0]
+            if darkField != None and flatField != None:
+                print("Try to normalize")
+                #if numpy.shape(darkField) == numpy.shape(flatField) and numpy.shape(flatField) == numpy.shape(theSlice):
+                theSlice = Converter.normalize(theSlice, darkField, flatField, 0.01)
+                print (theSlice.dtype)
+            
+                    
+            print ("Slice shape %s" % str(numpy.shape(theSlice)))
+            stack_image.T[num] = theSlice.copy()
+        
+        return stack_image
+    
+    @staticmethod
+    def normalize(projection, dark, flat, def_val=0):
+        a = (projection - dark)
+        b = (flat-dark)
+        with numpy.errstate(divide='ignore', invalid='ignore'):
+            c = numpy.true_divide( a, b )
+            c[ ~ numpy.isfinite( c )] = def_val  # set to not zero if 0/0 
+        return c
+
+
+
+## Utility functions to transform numpy arrays to vtkImageData and viceversa
+#def numpy2vtkImporter(nparray, spacing=(1.,1.,1.), origin=(0,0,0)):
+#    return Converter.numpy2vtkImporter(nparray, spacing, origin)
+#
+#def numpy2vtk(nparray, spacing=(1.,1.,1.), origin=(0,0,0)):
+#    return Converter.numpy2vtk(nparray, spacing, origin)
+#
+#def vtk2numpy(imgdata):
+#    return Converter.vtk2numpy(imgdata)
+#
+#def tiffStack2numpy(filename, indices):
+#    return Converter.tiffStack2numpy(filename, indices)
+
+class ViewerEvent(Enum):
+    # left button
+    PICK_EVENT = 0 
+    # alt  + right button + move
+    WINDOW_LEVEL_EVENT = 1
+    # shift + right button
+    ZOOM_EVENT = 2
+    # control + right button
+    PAN_EVENT = 3
+    # control + left button
+    CREATE_ROI_EVENT = 4
+    # alt + left button
+    DELETE_ROI_EVENT = 5
+    # release button
+    NO_EVENT = -1
+
+
+#class CILInteractorStyle(vtk.vtkInteractorStyleTrackballCamera):
+class CILInteractorStyle(vtk.vtkInteractorStyleImage):
+    
+    def __init__(self, callback):
+        vtk.vtkInteractorStyleImage.__init__(self)
+        self.callback = callback
+        self._viewer = callback
+        priority = 1.0
+        
+#        self.AddObserver("MouseWheelForwardEvent" , callback.OnMouseWheelForward , priority)
+#        self.AddObserver("MouseWheelBackwardEvent" , callback.OnMouseWheelBackward, priority)
+#        self.AddObserver('KeyPressEvent', callback.OnKeyPress, priority)
+#        self.AddObserver('LeftButtonPressEvent', callback.OnLeftButtonPressEvent, priority)
+#        self.AddObserver('RightButtonPressEvent', callback.OnRightButtonPressEvent, priority)
+#        self.AddObserver('LeftButtonReleaseEvent', callback.OnLeftButtonReleaseEvent, priority)
+#        self.AddObserver('RightButtonReleaseEvent', callback.OnRightButtonReleaseEvent, priority)
+#        self.AddObserver('MouseMoveEvent', callback.OnMouseMoveEvent, priority)
+        
+        self.AddObserver("MouseWheelForwardEvent" , self.OnMouseWheelForward , priority)
+        self.AddObserver("MouseWheelBackwardEvent" , self.OnMouseWheelBackward, priority)
+        self.AddObserver('KeyPressEvent', self.OnKeyPress, priority)
+        self.AddObserver('LeftButtonPressEvent', self.OnLeftButtonPressEvent, priority)
+        self.AddObserver('RightButtonPressEvent', self.OnRightButtonPressEvent, priority)
+        self.AddObserver('LeftButtonReleaseEvent', self.OnLeftButtonReleaseEvent, priority)
+        self.AddObserver('RightButtonReleaseEvent', self.OnRightButtonReleaseEvent, priority)
+        self.AddObserver('MouseMoveEvent', self.OnMouseMoveEvent, priority)
+        
+        self.InitialEventPosition = (0,0)
+        
+        
+    def SetInitialEventPosition(self, xy):
+        self.InitialEventPosition = xy
+        
+    def GetInitialEventPosition(self):
+        return self.InitialEventPosition
+    
+    def GetKeyCode(self):
+        return self.GetInteractor().GetKeyCode()
+    
+    def SetKeyCode(self, keycode):
+        self.GetInteractor().SetKeyCode(keycode)
+        
+    def GetControlKey(self):
+        return self.GetInteractor().GetControlKey() == CONTROL_KEY
+    
+    def GetShiftKey(self):
+        return self.GetInteractor().GetShiftKey() == SHIFT_KEY
+    
+    def GetAltKey(self):
+        return self.GetInteractor().GetAltKey() == ALT_KEY
+    
+    def GetEventPosition(self):
+        return self.GetInteractor().GetEventPosition()
+    
+    def GetEventPositionInWorldCoordinates(self):
+        pass
+    
+    def GetDeltaEventPosition(self):
+        x,y = self.GetInteractor().GetEventPosition()
+        return (x - self.InitialEventPosition[0] , y - self.InitialEventPosition[1])
+    
+    def Dolly(self, factor):
+        self.callback.camera.Dolly(factor)
+        self.callback.ren.ResetCameraClippingRange()
+        
+    def GetDimensions(self):
+        return self._viewer.img3D.GetDimensions()
+    
+    def GetInputData(self):
+        return self._viewer.img3D
+    
+    def GetSliceOrientation(self):
+        return self._viewer.sliceOrientation
+    
+    def SetSliceOrientation(self, orientation):
+        self._viewer.sliceOrientation = orientation
+
+    def GetActiveSlice(self):
+        return self._viewer.sliceno
+    
+    def SetActiveSlice(self, sliceno):
+        self._viewer.sliceno = sliceno
+    
+    def UpdatePipeline(self, reset = False):
+        self._viewer.updatePipeline(reset)
+        
+    def GetActiveCamera(self):
+        return self._viewer.ren.GetActiveCamera()
+    
+    def SetActiveCamera(self, camera):
+        self._viewer.ren.SetActiveCamera(camera)
+    
+    def ResetCamera(self):
+        self._viewer.ren.ResetCamera()
+    
+    def Render(self):
+        self._viewer.renWin.Render()
+        
+    def UpdateSliceActor(self):
+        self._viewer.sliceActor.Update()
+    
+    def AdjustCamera(self):
+        self._viewer.AdjustCamera()
+        
+    def SaveRender(self, filename):
+        self._viewer.SaveRender(filename)
+        
+    def GetRenderWindow(self):
+        return self._viewer.renWin
+        
+    def GetRenderer(self):
+        return self._viewer.ren
+    
+    def GetROIWidget(self):
+        return self._viewer.ROIWidget
+    
+    def SetViewerEvent(self, event):
+        self._viewer.event = event
+        
+    def GetViewerEvent(self):
+        return self._viewer.event
+    
+    def SetInitialCameraPosition(self, position):
+        self._viewer.InitialCameraPosition = position
+        
+    def GetInitialCameraPosition(self):
+        return self._viewer.InitialCameraPosition
+
+    def SetInitialLevel(self, level):
+        self._viewer.InitialLevel = level
+    
+    def GetInitialLevel(self):
+        return self._viewer.InitialLevel
+    
+    def SetInitialWindow(self, window):
+        self._viewer.InitialWindow = window
+    
+    def GetInitialWindow(self):
+        return self._viewer.InitialWindow
+    
+    def GetWindowLevel(self):
+        return self._viewer.wl
+    
+    def SetROI(self, roi):
+        self._viewer.ROI = roi
+        
+    def GetROI(self):
+        return self._viewer.ROI
+    
+    def UpdateCornerAnnotation(self, text, corner):
+        self._viewer.updateCornerAnnotation(text, corner)
+
+    def GetPicker(self):
+        return self._viewer.picker
+    
+    def GetCornerAnnotation(self):
+        return self._viewer.cornerAnnotation
+    
+    def UpdateROIHistogram(self):
+        self._viewer.updateROIHistogram()
+        
+        
+    ############### Handle events
+    def OnMouseWheelForward(self, interactor, event):
+        maxSlice = self.GetDimensions()[self.GetSliceOrientation()]
+        shift = interactor.GetShiftKey()
+        advance = 1
+        if shift:
+            advance = 10
+            
+        if (self.GetActiveSlice() + advance < maxSlice):
+            self.SetActiveSlice(self.GetActiveSlice() + advance)
+            
+            self.UpdatePipeline()
+        else:
+            print ("maxSlice %d request %d" % (maxSlice, self.GetActiveSlice() + 1 ))
+    
+    def OnMouseWheelBackward(self, interactor, event):
+        minSlice = 0
+        shift = interactor.GetShiftKey()
+        advance = 1
+        if shift:
+            advance = 10
+        if (self.GetActiveSlice() - advance >= minSlice):
+            self.SetActiveSlice( self.GetActiveSlice() - advance)
+            self.UpdatePipeline()
+        else:
+            print ("minSlice %d request %d" % (minSlice, self.GetActiveSlice() + 1 ))
+        
+    def OnKeyPress(self, interactor, event):
+        #print ("Pressed key %s" % interactor.GetKeyCode())
+        # Slice Orientation 
+        if interactor.GetKeyCode() == "X":
+            # slice on the other orientation
+            self.SetSliceOrientation ( SLICE_ORIENTATION_YZ )
+            self.SetActiveSlice( int(self.GetDimensions()[1] / 2) )
+            self.UpdatePipeline(True)
+        elif interactor.GetKeyCode() == "Y":
+            # slice on the other orientation
+            self.SetSliceOrientation (  SLICE_ORIENTATION_XZ )
+            self.SetActiveSlice ( int(self.GetInputData().GetDimensions()[1] / 2) )
+            self.UpdatePipeline(True)
+        elif interactor.GetKeyCode() == "Z":
+            # slice on the other orientation
+            self.SetSliceOrientation (  SLICE_ORIENTATION_XY )
+            self.SetActiveSlice ( int(self.GetInputData().GetDimensions()[2] / 2) )
+            self.UpdatePipeline(True)
+        if interactor.GetKeyCode() == "x":
+            # Change the camera view point
+            camera = vtk.vtkCamera()
+            camera.SetFocalPoint(self.GetActiveCamera().GetFocalPoint())
+            camera.SetViewUp(self.GetActiveCamera().GetViewUp())
+            newposition = [i for i in self.GetActiveCamera().GetFocalPoint()]
+            newposition[SLICE_ORIENTATION_YZ] = numpy.sqrt(newposition[SLICE_ORIENTATION_XY] ** 2 + newposition[SLICE_ORIENTATION_XZ] ** 2) 
+            camera.SetPosition(newposition)
+            camera.SetViewUp(0,0,-1)
+            self.SetActiveCamera(camera)
+            self.Render()
+            interactor.SetKeyCode("X")
+            self.OnKeyPress(interactor, event)
+        elif interactor.GetKeyCode() == "y":
+             # Change the camera view point
+            camera = vtk.vtkCamera()
+            camera.SetFocalPoint(self.GetActiveCamera().GetFocalPoint())
+            camera.SetViewUp(self.GetActiveCamera().GetViewUp())
+            newposition = [i for i in self.GetActiveCamera().GetFocalPoint()]
+            newposition[SLICE_ORIENTATION_XZ] = numpy.sqrt(newposition[SLICE_ORIENTATION_XY] ** 2 + newposition[SLICE_ORIENTATION_YZ] ** 2) 
+            camera.SetPosition(newposition)
+            camera.SetViewUp(0,0,-1)
+            self.SetActiveCamera(camera)
+            self.Render()
+            interactor.SetKeyCode("Y")
+            self.OnKeyPress(interactor, event)
+        elif interactor.GetKeyCode() == "z":
+             # Change the camera view point
+            camera = vtk.vtkCamera()
+            camera.SetFocalPoint(self.GetActiveCamera().GetFocalPoint())
+            camera.SetViewUp(self.GetActiveCamera().GetViewUp())
+            newposition = [i for i in self.GetActiveCamera().GetFocalPoint()]
+            newposition[SLICE_ORIENTATION_XY] = numpy.sqrt(newposition[SLICE_ORIENTATION_YZ] ** 2 + newposition[SLICE_ORIENTATION_XZ] ** 2) 
+            camera.SetPosition(newposition)
+            camera.SetViewUp(0,1,0)
+            self.SetActiveCamera(camera)
+            self.ResetCamera()
+            self.Render()
+            interactor.SetKeyCode("Z")
+            self.OnKeyPress(interactor, event)
+        elif interactor.GetKeyCode() == "a":
+            # reset color/window
+            cmax = self._viewer.ia.GetMax()[0]
+            cmin = self._viewer.ia.GetMin()[0]
+            
+            self.SetInitialLevel( (cmax+cmin)/2 )
+            self.SetInitialWindow( cmax-cmin )
+            
+            self.GetWindowLevel().SetLevel(self.GetInitialLevel())
+            self.GetWindowLevel().SetWindow(self.GetInitialWindow())
+            
+            self.GetWindowLevel().Update()
+                
+            self.UpdateSliceActor()
+            self.AdjustCamera()
+            self.Render()
+            
+        elif interactor.GetKeyCode() == "s":
+            filename = "current_render"
+            self.SaveRender(filename)
+        elif interactor.GetKeyCode() == "q":
+            print ("Terminating by pressing q %s" % (interactor.GetKeyCode(), ))
+            interactor.SetKeyCode("e")
+            self.OnKeyPress(interactor, event)
+        else :
+            #print ("Unhandled event %s" % (interactor.GetKeyCode(), )))
+            pass 
+    
+    def OnLeftButtonPressEvent(self, interactor, event):
+        alt = interactor.GetAltKey()
+        shift = interactor.GetShiftKey()
+        ctrl = interactor.GetControlKey()
+#        print ("alt pressed " + (lambda x : "Yes" if x else "No")(alt))
+#        print ("shift pressed " + (lambda x : "Yes" if x else "No")(shift))
+#        print ("ctrl pressed " + (lambda x : "Yes" if x else "No")(ctrl))
+        
+        interactor.SetInitialEventPosition(interactor.GetEventPosition())
+        
+        if ctrl and not (alt and shift): 
+            self.SetViewerEvent( ViewerEvent.CREATE_ROI_EVENT )
+            wsize = self.GetRenderWindow().GetSize()
+            position = interactor.GetEventPosition()
+            self.GetROIWidget().GetBorderRepresentation().SetPosition((position[0]/wsize[0] - 0.05) , (position[1]/wsize[1] - 0.05))
+            self.GetROIWidget().GetBorderRepresentation().SetPosition2( (0.1) , (0.1))
+            
+            self.GetROIWidget().On()
+            self.SetDisplayHistogram(True)
+            self.Render()
+            print ("Event %s is CREATE_ROI_EVENT" % (event))
+        elif alt and not (shift and ctrl):
+            self.SetViewerEvent( ViewerEvent.DELETE_ROI_EVENT )
+            self.GetROIWidget().Off()
+            self._viewer.updateCornerAnnotation("", 1, False)
+            self.SetDisplayHistogram(False)
+            self.Render()
+            print ("Event %s is DELETE_ROI_EVENT" % (event))
+        elif not (ctrl and alt and shift):
+            self.SetViewerEvent ( ViewerEvent.PICK_EVENT )
+            self.HandlePickEvent(interactor, event)
+            print ("Event %s is PICK_EVENT" % (event))
+        
+          
+    def SetDisplayHistogram(self, display):
+        if display:
+            if (self._viewer.displayHistogram == 0):
+                self.GetRenderer().AddActor(self._viewer.histogramPlotActor)
+                self.firstHistogram = 1
+                self.Render()
+                
+            self._viewer.histogramPlotActor.VisibilityOn()
+            self._viewer.displayHistogram = True
+        else:
+            self._viewer.histogramPlotActor.VisibilityOff()
+            self._viewer.displayHistogram = False
+            
+    
+    def OnLeftButtonReleaseEvent(self, interactor, event):
+        if self.GetViewerEvent() == ViewerEvent.CREATE_ROI_EVENT:
+            #bc = self.ROIWidget.GetBorderRepresentation().GetPositionCoordinate()
+            #print (bc.GetValue())
+            self.OnROIModifiedEvent(interactor, event)
+            
+        elif self.GetViewerEvent() == ViewerEvent.PICK_EVENT:
+            self.HandlePickEvent(interactor, event)
+         
+        self.SetViewerEvent( ViewerEvent.NO_EVENT )
+
+    def OnRightButtonPressEvent(self, interactor, event):
+        alt = interactor.GetAltKey()
+        shift = interactor.GetShiftKey()
+        ctrl = interactor.GetControlKey()
+#        print ("alt pressed " + (lambda x : "Yes" if x else "No")(alt))
+#        print ("shift pressed " + (lambda x : "Yes" if x else "No")(shift))
+#        print ("ctrl pressed " + (lambda x : "Yes" if x else "No")(ctrl))
+        
+        interactor.SetInitialEventPosition(interactor.GetEventPosition())
+        
+        
+        if alt and not (ctrl and shift):
+            self.SetViewerEvent( ViewerEvent.WINDOW_LEVEL_EVENT )
+            print ("Event %s is WINDOW_LEVEL_EVENT" % (event))
+            self.HandleWindowLevel(interactor, event)
+        elif shift and not (ctrl and alt):
+            self.SetViewerEvent( ViewerEvent.ZOOM_EVENT )
+            self.SetInitialCameraPosition( self.GetActiveCamera().GetPosition())
+            print ("Event %s is ZOOM_EVENT" % (event))
+        elif ctrl and not (shift and alt):
+            self.SetViewerEvent (ViewerEvent.PAN_EVENT )
+            self.SetInitialCameraPosition ( self.GetActiveCamera().GetPosition() )
+            print ("Event %s is PAN_EVENT" % (event))
+        
+    def OnRightButtonReleaseEvent(self, interactor, event):
+        print (event)
+        if self.GetViewerEvent() == ViewerEvent.WINDOW_LEVEL_EVENT:
+            self.SetInitialLevel( self.GetWindowLevel().GetLevel() )
+            self.SetInitialWindow ( self.GetWindowLevel().GetWindow() )
+        elif self.GetViewerEvent() == ViewerEvent.ZOOM_EVENT or \
+             self.GetViewerEvent() == ViewerEvent.PAN_EVENT:
+            self.SetInitialCameraPosition( () )
+			
+        self.SetViewerEvent( ViewerEvent.NO_EVENT )
+        
+    
+    def OnROIModifiedEvent(self, interactor, event):
+        
+        #print ("ROI EVENT " + event)
+        p1 = self.GetROIWidget().GetBorderRepresentation().GetPositionCoordinate()
+        p2 = self.GetROIWidget().GetBorderRepresentation().GetPosition2Coordinate()
+        wsize = self.GetRenderWindow().GetSize()
+        
+        #print (p1.GetValue())
+        #print (p2.GetValue())
+        pp1 = [p1.GetValue()[0] * wsize[0] , p1.GetValue()[1] * wsize[1] , 0.0]
+        pp2 = [p2.GetValue()[0] * wsize[0] + pp1[0] , p2.GetValue()[1] * wsize[1] + pp1[1] , 0.0]
+        vox1 = self.viewport2imageCoordinate(pp1)
+        vox2 = self.viewport2imageCoordinate(pp2)
+        
+        self.SetROI( (vox1 , vox2) )
+        roi = self.GetROI()
+        print ("Pixel1 %d,%d,%d Value %f" % vox1 )
+        print ("Pixel2 %d,%d,%d Value %f" % vox2 )
+        if self.GetSliceOrientation() == SLICE_ORIENTATION_XY: 
+            print ("slice orientation : XY")
+            x = abs(roi[1][0] - roi[0][0])
+            y = abs(roi[1][1] - roi[0][1])
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_XZ:
+            print ("slice orientation : XY")
+            x = abs(roi[1][0] - roi[0][0])
+            y = abs(roi[1][2] - roi[0][2])
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_YZ:
+            print ("slice orientation : XY")
+            x = abs(roi[1][1] - roi[0][1])
+            y = abs(roi[1][2] - roi[0][2])
+        
+        text = "ROI: %d x %d, %.2f kp" % (x,y,float(x*y)/1024.)
+        print (text)
+        self.UpdateCornerAnnotation(text, 1)
+        self.UpdateROIHistogram()
+        self.SetViewerEvent( ViewerEvent.NO_EVENT )
+        
+    def viewport2imageCoordinate(self, viewerposition):
+        #Determine point index
+        
+        self.GetPicker().Pick(viewerposition[0], viewerposition[1], 0.0, self.GetRenderer())
+        pickPosition = list(self.GetPicker().GetPickPosition())
+        pickPosition[self.GetSliceOrientation()] = \
+            self.GetInputData().GetSpacing()[self.GetSliceOrientation()] * self.GetActiveSlice() + \
+            self.GetInputData().GetOrigin()[self.GetSliceOrientation()]
+        print ("Pick Position " + str (pickPosition))
+        
+        if (pickPosition != [0,0,0]):
+            dims = self.GetInputData().GetDimensions()
+            print (dims)
+            spac = self.GetInputData().GetSpacing()
+            orig = self.GetInputData().GetOrigin()
+            imagePosition = [int(pickPosition[i] / spac[i] + orig[i]) for i in range(3) ]
+            
+            pixelValue = self.GetInputData().GetScalarComponentAsDouble(imagePosition[0], imagePosition[1], imagePosition[2], 0)
+            return (imagePosition[0], imagePosition[1], imagePosition[2] , pixelValue)
+        else:
+            return (0,0,0,0)
+
+        
+    
+    
+    def OnMouseMoveEvent(self, interactor, event):        
+        if self.GetViewerEvent() == ViewerEvent.WINDOW_LEVEL_EVENT:
+            print ("Event %s is WINDOW_LEVEL_EVENT" % (event))
+            self.HandleWindowLevel(interactor, event)    
+        elif self.GetViewerEvent() == ViewerEvent.PICK_EVENT:
+            self.HandlePickEvent(interactor, event)
+        elif self.GetViewerEvent() == ViewerEvent.ZOOM_EVENT:
+            self.HandleZoomEvent(interactor, event)
+        elif self.GetViewerEvent() == ViewerEvent.PAN_EVENT:
+            self.HandlePanEvent(interactor, event)
+            
+            
+    def HandleZoomEvent(self, interactor, event):
+        dx,dy = interactor.GetDeltaEventPosition()   
+        size = self.GetRenderWindow().GetSize()
+        dy = - 4 * dy / size[1]
+        
+        print ("distance: " + str(self.GetActiveCamera().GetDistance()))
+        
+        print ("\ndy: %f\ncamera dolly %f\n" % (dy, 1 + dy))
+        
+        camera = vtk.vtkCamera()
+        camera.SetFocalPoint(self.GetActiveCamera().GetFocalPoint())
+        #print ("current position " + str(self.InitialCameraPosition))
+        camera.SetViewUp(self.GetActiveCamera().GetViewUp())
+        camera.SetPosition(self.GetInitialCameraPosition())
+        newposition = [i for i in self.GetInitialCameraPosition()]
+        if self.GetSliceOrientation() == SLICE_ORIENTATION_XY: 
+            dist = newposition[SLICE_ORIENTATION_XY] * ( 1 + dy ) 
+            newposition[SLICE_ORIENTATION_XY] *= ( 1 + dy )
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_XZ:
+            newposition[SLICE_ORIENTATION_XZ] *= ( 1 + dy )
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_YZ:
+            newposition[SLICE_ORIENTATION_YZ] *= ( 1 + dy )
+        #print ("new position " + str(newposition))
+        camera.SetPosition(newposition)
+        self.SetActiveCamera(camera)
+        
+        self.Render()
+        	
+        print ("distance after: " + str(self.GetActiveCamera().GetDistance()))
+        
+    def HandlePanEvent(self, interactor, event):
+        x,y = interactor.GetEventPosition()
+        x0,y0 = interactor.GetInitialEventPosition()
+        
+        ic = self.viewport2imageCoordinate((x,y))
+        ic0 = self.viewport2imageCoordinate((x0,y0))
+        
+        dx = 4 *( ic[0] - ic0[0])
+        dy = 4* (ic[1] - ic0[1])
+        
+        camera = vtk.vtkCamera()
+        #print ("current position " + str(self.InitialCameraPosition))
+        camera.SetViewUp(self.GetActiveCamera().GetViewUp())
+        camera.SetPosition(self.GetInitialCameraPosition())
+        newposition = [i for i in self.GetInitialCameraPosition()]
+        newfocalpoint = [i for i in self.GetActiveCamera().GetFocalPoint()]
+        if self.GetSliceOrientation() == SLICE_ORIENTATION_XY: 
+            newposition[0] -= dx
+            newposition[1] -= dy
+            newfocalpoint[0] = newposition[0]
+            newfocalpoint[1] = newposition[1]
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_XZ:
+            newposition[0] -= dx
+            newposition[2] -= dy
+            newfocalpoint[0] = newposition[0]
+            newfocalpoint[2] = newposition[2]
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_YZ:
+            newposition[1] -= dx
+            newposition[2] -= dy
+            newfocalpoint[2] = newposition[2]
+            newfocalpoint[1] = newposition[1]
+        #print ("new position " + str(newposition))
+        camera.SetFocalPoint(newfocalpoint)
+        camera.SetPosition(newposition)
+        self.SetActiveCamera(camera)
+        
+        self.Render()
+        
+    def HandleWindowLevel(self, interactor, event):
+        dx,dy = interactor.GetDeltaEventPosition()
+        print ("Event delta %d %d" % (dx,dy))
+        size = self.GetRenderWindow().GetSize()
+        
+        dx = 4 * dx / size[0]
+        dy = 4 * dy / size[1]
+        window = self.GetInitialWindow()
+        level = self.GetInitialLevel()
+        
+        if abs(window) > 0.01:
+            dx = dx * window
+        else:
+            dx = dx * (lambda x: -0.01 if x <0 else 0.01)(window);
+			
+        if abs(level) > 0.01:
+            dy = dy * level
+        else:
+            dy = dy * (lambda x: -0.01 if x <0 else 0.01)(level)
+			
+
+        # Abs so that direction does not flip
+
+        if window < 0.0:
+            dx = -1*dx
+        if level < 0.0:
+            dy = -1*dy
+
+		 # Compute new window level
+
+        newWindow = dx + window
+        newLevel = level - dy
+
+        # Stay away from zero and really
+
+        if abs(newWindow) < 0.01:
+            newWindow = 0.01 * (lambda x: -1 if x <0 else 1)(newWindow)
+
+        if abs(newLevel) < 0.01:
+            newLevel = 0.01 * (lambda x: -1 if x <0 else 1)(newLevel)
+
+        self.GetWindowLevel().SetWindow(newWindow)
+        self.GetWindowLevel().SetLevel(newLevel)
+        
+        self.GetWindowLevel().Update()
+        self.UpdateSliceActor()
+        self.AdjustCamera()
+        
+        self.Render()
+    
+    def HandlePickEvent(self, interactor, event):
+        position = interactor.GetEventPosition()
+        #print ("PICK " + str(position))
+        vox = self.viewport2imageCoordinate(position)
+        #print ("Pixel %d,%d,%d Value %f" % vox )
+        self._viewer.cornerAnnotation.VisibilityOn()
+        self.UpdateCornerAnnotation("[%d,%d,%d] : %.2f" % vox , 0)
+        self.Render()
+        
+###############################################################################
+    
+        
+
+class CILViewer2D():
+    '''Simple Interactive Viewer based on VTK classes'''
+    
+    def __init__(self, dimx=600,dimy=600, ren=None, renWin=None,iren=None):
+        '''creates the rendering pipeline'''
+        # create a rendering window and renderer
+        if ren == None:
+            self.ren = vtk.vtkRenderer()
+        else:
+            self.ren = ren
+        if renWin == None:
+            self.renWin = vtk.vtkRenderWindow()
+        else:
+            self.renWin = renWin
+        if iren == None:
+            self.iren = vtk.vtkRenderWindowInteractor()
+        else:
+            self.iren = iren
+            
+        self.renWin.SetSize(dimx,dimy)
+        self.renWin.AddRenderer(self.ren)
+        
+        self.style = CILInteractorStyle(self)
+        
+        self.iren.SetInteractorStyle(self.style)
+        self.iren.SetRenderWindow(self.renWin)
+        self.iren.Initialize()
+        self.ren.SetBackground(.1, .2, .4)
+        
+        self.camera = vtk.vtkCamera()
+        self.camera.ParallelProjectionOn()
+        self.ren.SetActiveCamera(self.camera)
+        
+        # data
+        self.img3D = None
+        self.sliceno = 0
+        self.sliceOrientation = SLICE_ORIENTATION_XY
+        
+        #Actors
+        self.sliceActor = vtk.vtkImageActor()
+        self.voi = vtk.vtkExtractVOI()
+        self.wl = vtk.vtkImageMapToWindowLevelColors()
+        self.ia = vtk.vtkImageAccumulate()
+        self.sliceActorNo = 0
+        
+        #initial Window/Level
+        self.InitialLevel = 0
+        self.InitialWindow = 0
+        
+        #ViewerEvent
+        self.event = ViewerEvent.NO_EVENT
+        
+        # ROI Widget
+        self.ROIWidget = vtk.vtkBorderWidget()
+        self.ROIWidget.SetInteractor(self.iren)
+        self.ROIWidget.CreateDefaultRepresentation()
+        self.ROIWidget.GetBorderRepresentation().GetBorderProperty().SetColor(0,1,0)
+        self.ROIWidget.AddObserver(vtk.vtkWidgetEvent.Select, self.style.OnROIModifiedEvent, 1.0)
+        
+        # edge points of the ROI
+        self.ROI = ()
+        
+        #picker
+        self.picker = vtk.vtkPropPicker()
+        self.picker.PickFromListOn()
+        self.picker.AddPickList(self.sliceActor)
+
+        self.iren.SetPicker(self.picker)
+        
+        # corner annotation
+        self.cornerAnnotation = vtk.vtkCornerAnnotation()
+        self.cornerAnnotation.SetMaximumFontSize(12);
+        self.cornerAnnotation.PickableOff();
+        self.cornerAnnotation.VisibilityOff();
+        self.cornerAnnotation.GetTextProperty().ShadowOn();
+        self.cornerAnnotation.SetLayerNumber(1);
+        
+        
+        
+        # cursor doesn't show up
+        self.cursor = vtk.vtkCursor2D()
+        self.cursorMapper = vtk.vtkPolyDataMapper2D()
+        self.cursorActor = vtk.vtkActor2D()
+        self.cursor.SetModelBounds(-10, 10, -10, 10, 0, 0)
+        self.cursor.SetFocalPoint(0, 0, 0)
+        self.cursor.AllOff()
+        self.cursor.AxesOn()
+        self.cursorActor.PickableOff()
+        self.cursorActor.VisibilityOn()
+        self.cursorActor.GetProperty().SetColor(1, 1, 1)
+        self.cursorActor.SetLayerNumber(1)
+        self.cursorMapper.SetInputData(self.cursor.GetOutput())
+        self.cursorActor.SetMapper(self.cursorMapper)
+        
+        # Zoom
+        self.InitialCameraPosition = ()
+        
+        # XY Plot actor for histogram
+        self.displayHistogram = False
+        self.firstHistogram = 0
+        self.roiIA = vtk.vtkImageAccumulate()
+        self.roiVOI = vtk.vtkExtractVOI()
+        self.histogramPlotActor = vtk.vtkXYPlotActor()
+        self.histogramPlotActor.ExchangeAxesOff();
+        self.histogramPlotActor.SetXLabelFormat( "%g" )
+        self.histogramPlotActor.SetXLabelFormat( "%g" )
+        self.histogramPlotActor.SetAdjustXLabels(3)
+        self.histogramPlotActor.SetXTitle( "Level" )
+        self.histogramPlotActor.SetYTitle( "N" )
+        self.histogramPlotActor.SetXValuesToValue()
+        self.histogramPlotActor.SetPlotColor(0, (0,1,1) )
+        self.histogramPlotActor.SetPosition(0.6,0.6)
+        self.histogramPlotActor.SetPosition2(0.4,0.4)
+ 
+        
+        
+    def GetInteractor(self):
+        return self.iren
+    
+    def GetRenderer(self):
+        return self.ren
+        
+    def setInput3DData(self, imageData):
+        self.img3D = imageData
+        self.installPipeline()
+
+    def setInputAsNumpy(self, numpyarray,  origin=(0,0,0), spacing=(1.,1.,1.), 
+                        rescale=True, dtype=vtk.VTK_UNSIGNED_SHORT):
+        importer = Converter.numpy2vtkImporter(numpyarray, spacing, origin)
+        importer.Update()
+        
+        if rescale:
+            # rescale to appropriate VTK_UNSIGNED_SHORT
+            stats = vtk.vtkImageAccumulate()
+            stats.SetInputData(importer.GetOutput())
+            stats.Update()
+            iMin = stats.GetMin()[0]
+            iMax = stats.GetMax()[0]
+            if (iMax - iMin == 0):
+                scale = 1
+            else:
+                if dtype == vtk.VTK_UNSIGNED_SHORT:
+                    scale = vtk.VTK_UNSIGNED_SHORT_MAX / (iMax - iMin)
+                elif dtype == vtk.VTK_UNSIGNED_INT:
+                    scale = vtk.VTK_UNSIGNED_INT_MAX / (iMax - iMin)
+    
+            shiftScaler = vtk.vtkImageShiftScale ()
+            shiftScaler.SetInputData(importer.GetOutput())
+            shiftScaler.SetScale(scale)
+            shiftScaler.SetShift(-iMin)
+            shiftScaler.SetOutputScalarType(dtype)
+            shiftScaler.Update()
+            self.img3D = shiftScaler.GetOutput()
+        else:
+            self.img3D = importer.GetOutput()
+            
+        self.installPipeline()
+
+    def displaySlice(self, sliceno = 0):
+        self.sliceno = sliceno
+        
+        self.updatePipeline()
+        
+        self.renWin.Render()
+        
+        return self.sliceActorNo
+
+    def updatePipeline(self, resetcamera = False):
+        extent = [ i for i in self.img3D.GetExtent()]
+        extent[self.sliceOrientation * 2] = self.sliceno
+        extent[self.sliceOrientation * 2 + 1] = self.sliceno 
+        self.voi.SetVOI(extent[0], extent[1],
+                   extent[2], extent[3],
+                   extent[4], extent[5])
+        
+        self.voi.Update()
+        self.ia.Update()
+        self.wl.Update()
+        self.sliceActor.SetDisplayExtent(extent[0], extent[1],
+                   extent[2], extent[3],
+                   extent[4], extent[5])
+        self.sliceActor.Update()
+        
+        self.updateCornerAnnotation("Slice %d/%d" % (self.sliceno + 1 , self.img3D.GetDimensions()[self.sliceOrientation]))
+        
+        if self.displayHistogram:
+            self.updateROIHistogram()            
+            
+        self.AdjustCamera(resetcamera)
+        
+        self.renWin.Render()
+        
+        
+    def installPipeline(self):
+        '''Slices a 3D volume and then creates an actor to be rendered'''
+        
+        self.ren.AddViewProp(self.cornerAnnotation)
+        
+        self.voi.SetInputData(self.img3D)
+        #select one slice in Z
+        extent = [ i for i in self.img3D.GetExtent()]
+        extent[self.sliceOrientation * 2] = self.sliceno
+        extent[self.sliceOrientation * 2 + 1] = self.sliceno 
+        self.voi.SetVOI(extent[0], extent[1],
+                   extent[2], extent[3],
+                   extent[4], extent[5])
+        
+        self.voi.Update()
+        # set window/level for current slices
+         
+    
+        self.wl = vtk.vtkImageMapToWindowLevelColors()
+        self.ia.SetInputData(self.voi.GetOutput())
+        self.ia.Update()
+        cmax = self.ia.GetMax()[0]
+        cmin = self.ia.GetMin()[0]
+        
+        self.InitialLevel = (cmax+cmin)/2
+        self.InitialWindow = cmax-cmin
+
+        
+        self.wl.SetLevel(self.InitialLevel)
+        self.wl.SetWindow(self.InitialWindow)
+        
+        self.wl.SetInputData(self.voi.GetOutput())
+        self.wl.Update()
+            
+        self.sliceActor.SetInputData(self.wl.GetOutput())
+        self.sliceActor.SetDisplayExtent(extent[0], extent[1],
+                   extent[2], extent[3],
+                   extent[4], extent[5])
+        self.sliceActor.Update()
+        self.sliceActor.SetInterpolate(False)
+        self.ren.AddActor(self.sliceActor)
+        self.ren.ResetCamera()
+        self.ren.Render()
+        
+        self.AdjustCamera()
+        
+        self.ren.AddViewProp(self.cursorActor)
+        self.cursorActor.VisibilityOn()
+        
+        self.iren.Initialize()
+        self.renWin.Render()
+        #self.iren.Start()
+    
+    def AdjustCamera(self, resetcamera = False):
+        self.ren.ResetCameraClippingRange()
+        if resetcamera:
+            self.ren.ResetCamera()
+        
+            
+    def getROI(self):
+        return self.ROI
+    
+    def getROIExtent(self):
+        p0 = self.ROI[0]
+        p1 = self.ROI[1]
+        return (p0[0], p1[0],p0[1],p1[1],p0[2],p1[2])
+        
+    ############### Handle events are moved to the interactor style
+    
+        
+    def viewport2imageCoordinate(self, viewerposition):
+        #Determine point index
+        
+        self.picker.Pick(viewerposition[0], viewerposition[1], 0.0, self.GetRenderer())
+        pickPosition = list(self.picker.GetPickPosition())
+        pickPosition[self.sliceOrientation] = \
+            self.img3D.GetSpacing()[self.sliceOrientation] * self.sliceno + \
+            self.img3D.GetOrigin()[self.sliceOrientation]
+        print ("Pick Position " + str (pickPosition))
+        
+        if (pickPosition != [0,0,0]):
+            dims = self.img3D.GetDimensions()
+            print (dims)
+            spac = self.img3D.GetSpacing()
+            orig = self.img3D.GetOrigin()
+            imagePosition = [int(pickPosition[i] / spac[i] + orig[i]) for i in range(3) ]
+            
+            pixelValue = self.img3D.GetScalarComponentAsDouble(imagePosition[0], imagePosition[1], imagePosition[2], 0)
+            return (imagePosition[0], imagePosition[1], imagePosition[2] , pixelValue)
+        else:
+            return (0,0,0,0)
+
+        
+    
+    def GetRenderWindow(self):
+        return self.renWin
+    
+    
+    def startRenderLoop(self):
+        self.iren.Start()
+        
+    def GetSliceOrientation(self):
+        return self.sliceOrientation
+    
+    def GetActiveSlice(self):
+        return self.sliceno
+    
+    def updateCornerAnnotation(self, text , idx=0, visibility=True):
+        if visibility:
+            self.cornerAnnotation.VisibilityOn()
+        else:
+            self.cornerAnnotation.VisibilityOff()
+            
+        self.cornerAnnotation.SetText(idx, text)
+        self.iren.Render()
+        
+    def saveRender(self, filename, renWin=None):
+        '''Save the render window to PNG file'''
+        # screenshot code:
+        w2if = vtk.vtkWindowToImageFilter()
+        if renWin == None:
+            renWin = self.renWin
+        w2if.SetInput(renWin)
+        w2if.Update()
+         
+        writer = vtk.vtkPNGWriter()
+        writer.SetFileName("%s.png" % (filename))
+        writer.SetInputConnection(w2if.GetOutputPort())
+        writer.Write()
+    
+    def updateROIHistogram(self):
+        
+        extent = [0 for i in range(6)]
+        if self.GetSliceOrientation() == SLICE_ORIENTATION_XY: 
+            print ("slice orientation : XY")
+            extent[0] = self.ROI[0][0]
+            extent[1] = self.ROI[1][0]
+            extent[2] = self.ROI[0][1]
+            extent[3] = self.ROI[1][1]
+            extent[4] = self.GetActiveSlice()
+            extent[5] = self.GetActiveSlice()+1
+            #y = abs(roi[1][1] - roi[0][1])
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_XZ:
+            print ("slice orientation : XY")
+            extent[0] = self.ROI[0][0]
+            extent[1] = self.ROI[1][0]
+            #x = abs(roi[1][0] - roi[0][0])
+            extent[4] = self.ROI[0][2]
+            extent[5] = self.ROI[1][2]
+            #y = abs(roi[1][2] - roi[0][2])
+            extent[2] = self.GetActiveSlice()
+            extent[3] = self.GetActiveSlice()+1
+        elif self.GetSliceOrientation() == SLICE_ORIENTATION_YZ:
+            print ("slice orientation : XY")
+            extent[2] = self.ROI[0][1]
+            extent[3] = self.ROI[1][1]
+            #x = abs(roi[1][1] - roi[0][1])
+            extent[4] = self.ROI[0][2]
+            extent[5] = self.ROI[1][2]
+            #y = abs(roi[1][2] - roi[0][2])
+            extent[0] = self.GetActiveSlice()
+            extent[1] = self.GetActiveSlice()+1
+        
+        self.roiVOI.SetVOI(extent)
+        self.roiVOI.SetInputData(self.img3D)
+        self.roiVOI.Update()
+        irange = self.roiVOI.GetOutput().GetScalarRange()
+        
+        self.roiIA.SetInputData(self.roiVOI.GetOutput())
+        self.roiIA.IgnoreZeroOff()
+        self.roiIA.SetComponentExtent(0,int(irange[1]-irange[0]-1),0,0,0,0 )
+        self.roiIA.SetComponentOrigin( int(irange[0]),0,0 );
+        self.roiIA.SetComponentSpacing( 1,0,0 );
+        self.roiIA.Update()
+        
+        self.histogramPlotActor.AddDataSetInputConnection(self.roiIA.GetOutputPort())
+        self.histogramPlotActor.SetXRange(irange[0],irange[1])
+        
+        self.histogramPlotActor.SetYRange( self.roiIA.GetOutput().GetScalarRange() )
+        
+        
\ No newline at end of file
diff --git a/src/Python/ccpi/viewer/QVTKWidget.py b/src/Python/ccpi/viewer/QVTKWidget.py
new file mode 100644
index 0000000..906786b
--- /dev/null
+++ b/src/Python/ccpi/viewer/QVTKWidget.py
@@ -0,0 +1,340 @@
+################################################################################
+# File:         QVTKWidget.py
+# Author:       Edoardo Pasca
+# Description:  PyVE Viewer Qt widget
+#
+# License:
+#               This file is part of PyVE. PyVE is an open-source image 
+#               analysis and visualization environment focused on medical
+#               imaging. More info at http://pyve.sourceforge.net
+#	       
+#               Copyright (c) 2011-2012 Edoardo Pasca, Lukas Batteau 
+#               All rights reserved.
+#	       
+#              Redistribution and use in source and binary forms, with or
+#              without modification, are permitted provided that the following
+#              conditions are met:
+#
+#              Redistributions of source code must retain the above copyright
+#              notice, this list of conditions and the following disclaimer.
+#              Redistributions in binary form must reproduce the above
+#              copyright notice, this list of conditions and the following
+#              disclaimer in the documentation and/or other materials provided
+#              with the distribution.  Neither name of Edoardo Pasca or Lukas
+#              Batteau nor the names of any contributors may be used to endorse
+#              or promote products derived from this software without specific
+#              prior written permission.
+#
+#              THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+#              CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+#              INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#              MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+#              DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
+#              LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+#              OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#              PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+#              OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#              THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+#              TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+#              OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+#              OF SUCH DAMAGE.
+#
+# CHANGE HISTORY
+#
+# 20120118    Edoardo Pasca        Initial version
+#             
+###############################################################################
+
+import os
+from PyQt5 import QtCore, QtGui, QtWidgets
+#import itk
+import vtk
+#from viewer import PyveViewer
+from ccpi.viewer.CILViewer2D import CILViewer2D , Converter
+
+class QVTKWidget(QtWidgets.QWidget):
+
+    """ A QVTKWidget for Python and Qt."""
+
+    # Map between VTK and Qt cursors.
+    _CURSOR_MAP = {
+        0:  QtCore.Qt.ArrowCursor,          # VTK_CURSOR_DEFAULT
+        1:  QtCore.Qt.ArrowCursor,          # VTK_CURSOR_ARROW
+        2:  QtCore.Qt.SizeBDiagCursor,      # VTK_CURSOR_SIZENE
+        3:  QtCore.Qt.SizeFDiagCursor,      # VTK_CURSOR_SIZENWSE
+        4:  QtCore.Qt.SizeBDiagCursor,      # VTK_CURSOR_SIZESW
+        5:  QtCore.Qt.SizeFDiagCursor,      # VTK_CURSOR_SIZESE
+        6:  QtCore.Qt.SizeVerCursor,        # VTK_CURSOR_SIZENS
+        7:  QtCore.Qt.SizeHorCursor,        # VTK_CURSOR_SIZEWE
+        8:  QtCore.Qt.SizeAllCursor,        # VTK_CURSOR_SIZEALL
+        9:  QtCore.Qt.PointingHandCursor,   # VTK_CURSOR_HAND
+        10: QtCore.Qt.CrossCursor,          # VTK_CURSOR_CROSSHAIR
+    }
+
+    def __init__(self, parent=None, wflags=QtCore.Qt.WindowFlags(), **kw):
+        # the current button
+        self._ActiveButton = QtCore.Qt.NoButton
+
+        # private attributes
+        self.__oldFocus = None
+        self.__saveX = 0
+        self.__saveY = 0
+        self.__saveModifiers = QtCore.Qt.NoModifier
+        self.__saveButtons = QtCore.Qt.NoButton
+        self.__timeframe = 0
+
+        # create qt-level widget
+        QtWidgets.QWidget.__init__(self, parent, wflags|QtCore.Qt.MSWindowsOwnDC)
+        
+        # Link to PyVE Viewer
+        self._PyveViewer = CILViewer2D()
+        #self._Viewer = self._PyveViewer._vtkPyveViewer
+        
+        self._Iren = self._PyveViewer.GetInteractor()
+        #self._Iren = self._Viewer.GetRenderWindow().GetInteractor()
+        self._RenderWindow = self._PyveViewer.GetRenderWindow()
+        #self._RenderWindow = self._Viewer.GetRenderWindow()
+        
+        self._Iren.Register(self._RenderWindow)
+        self._Iren.SetRenderWindow(self._RenderWindow)
+        self._RenderWindow.SetWindowInfo(str(int(self.winId())))
+
+        # do all the necessary qt setup
+        self.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
+        self.setAttribute(QtCore.Qt.WA_PaintOnScreen)
+        self.setMouseTracking(True) # get all mouse events
+        self.setFocusPolicy(QtCore.Qt.WheelFocus)
+        self.setSizePolicy(QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding))
+
+        self._Timer = QtCore.QTimer(self)
+        #self.connect(self._Timer, QtCore.pyqtSignal('timeout()'), self.TimerEvent)
+
+        self._Iren.AddObserver('CreateTimerEvent', self.CreateTimer)
+        self._Iren.AddObserver('DestroyTimerEvent', self.DestroyTimer)
+        self._Iren.GetRenderWindow().AddObserver('CursorChangedEvent',
+                                                 self.CursorChangedEvent)
+
+    # Destructor
+    def __del__(self):
+        self._Iren.UnRegister(self._RenderWindow)
+        #QtWidgets.QWidget.__del__(self)
+
+    # Display image data
+    def SetInput(self, imageData):
+        self._PyveViewer.setInput3DData(imageData)
+        
+    # GetInteractor
+    def GetInteractor(self):
+        return self._Iren
+    
+    # Display image data
+    def GetPyveViewer(self):
+        return self._PyveViewer
+
+    def __getattr__(self, attr):
+        """Makes the object behave like a vtkGenericRenderWindowInteractor"""
+        print (attr)
+        if attr == '__vtk__':
+            return lambda t=self._Iren: t
+        elif hasattr(self._Iren, attr):
+            return getattr(self._Iren, attr)
+#        else:
+#            raise AttributeError( self.__class__.__name__ + \
+#                  " has no attribute named " + attr )
+
+    def CreateTimer(self, obj, evt):
+        self._Timer.start(10)
+
+    def DestroyTimer(self, obj, evt):
+        self._Timer.stop()
+        return 1
+
+    def TimerEvent(self):
+        self._Iren.InvokeEvent("TimerEvent")
+
+    def CursorChangedEvent(self, obj, evt):
+        """Called when the CursorChangedEvent fires on the render window."""
+        # This indirection is needed since when the event fires, the current
+        # cursor is not yet set so we defer this by which time the current
+        # cursor should have been set.
+        QtCore.QTimer.singleShot(0, self.ShowCursor)
+
+    def HideCursor(self):
+        """Hides the cursor."""
+        self.setCursor(QtCore.Qt.BlankCursor)
+
+    def ShowCursor(self):
+        """Shows the cursor."""
+        vtk_cursor = self._Iren.GetRenderWindow().GetCurrentCursor()
+        qt_cursor = self._CURSOR_MAP.get(vtk_cursor, QtCore.Qt.ArrowCursor)
+        self.setCursor(qt_cursor)
+
+    def sizeHint(self):
+        return QtCore.QSize(400, 400)
+
+    def paintEngine(self):
+        return None
+
+    def paintEvent(self, ev):
+        self._RenderWindow.Render()
+
+    def resizeEvent(self, ev):
+        self._RenderWindow.Render()
+        w = self.width()
+        h = self.height()
+
+        self._RenderWindow.SetSize(w, h)
+        self._Iren.SetSize(w, h)
+
+    def _GetCtrlShiftAlt(self, ev):
+        ctrl = shift = alt = False
+
+        if hasattr(ev, 'modifiers'):
+            if ev.modifiers() & QtCore.Qt.ShiftModifier:
+                shift = True
+            if ev.modifiers() & QtCore.Qt.ControlModifier:
+                ctrl = True
+            if ev.modifiers() & QtCore.Qt.AltModifier:
+                alt = True
+        else:
+            if self.__saveModifiers & QtCore.Qt.ShiftModifier:
+                shift = True
+            if self.__saveModifiers & QtCore.Qt.ControlModifier:
+                ctrl = True
+            if self.__saveModifiers & QtCore.Qt.AltModifier:
+                alt = True
+
+        return ctrl, shift, alt
+
+    def enterEvent(self, ev):
+        if not self.hasFocus():
+            self.__oldFocus = self.focusWidget()
+            self.setFocus()
+
+        ctrl, shift, alt = self._GetCtrlShiftAlt(ev)
+        self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
+                                            ctrl, shift, chr(0), 0, None)
+        self._Iren.SetAltKey(alt)
+        self._Iren.InvokeEvent("EnterEvent")
+
+    def leaveEvent(self, ev):
+        if self.__saveButtons == QtCore.Qt.NoButton and self.__oldFocus:
+            self.__oldFocus.setFocus()
+            self.__oldFocus = None
+
+        ctrl, shift, alt = self._GetCtrlShiftAlt(ev)
+        self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
+                                            ctrl, shift, chr(0), 0, None)
+        self._Iren.SetAltKey(alt)
+        self._Iren.InvokeEvent("LeaveEvent")
+
+    def mousePressEvent(self, ev):
+        ctrl, shift, alt = self._GetCtrlShiftAlt(ev)
+        repeat = 0
+        if ev.type() == QtCore.QEvent.MouseButtonDblClick:
+            repeat = 1
+        self._Iren.SetEventInformationFlipY(ev.x(), ev.y(),
+                                            ctrl, shift, chr(0), repeat, None)
+
+        self._Iren.SetAltKey(alt)
+        self._ActiveButton = ev.button()
+
+        if self._ActiveButton == QtCore.Qt.LeftButton:
+            self._Iren.InvokeEvent("LeftButtonPressEvent")
+        elif self._ActiveButton == QtCore.Qt.RightButton:
+            self._Iren.InvokeEvent("RightButtonPressEvent")
+        elif self._ActiveButton == QtCore.Qt.MidButton:
+            self._Iren.InvokeEvent("MiddleButtonPressEvent")
+
+    def mouseReleaseEvent(self, ev):
+        ctrl, shift, alt = self._GetCtrlShiftAlt(ev)
+        self._Iren.SetEventInformationFlipY(ev.x(), ev.y(),
+                                            ctrl, shift, chr(0), 0, None)
+        self._Iren.SetAltKey(alt)
+
+        if self._ActiveButton == QtCore.Qt.LeftButton:
+            self._Iren.InvokeEvent("LeftButtonReleaseEvent")
+        elif self._ActiveButton == QtCore.Qt.RightButton:
+            self._Iren.InvokeEvent("RightButtonReleaseEvent")
+        elif self._ActiveButton == QtCore.Qt.MidButton:
+            self._Iren.InvokeEvent("MiddleButtonReleaseEvent")
+
+    def mouseMoveEvent(self, ev):
+        self.__saveModifiers = ev.modifiers()
+        self.__saveButtons = ev.buttons()
+        self.__saveX = ev.x()
+        self.__saveY = ev.y()
+
+        ctrl, shift, alt = self._GetCtrlShiftAlt(ev)
+        self._Iren.SetEventInformationFlipY(ev.x(), ev.y(),
+                                            ctrl, shift, chr(0), 0, None)
+        self._Iren.SetAltKey(alt)
+        self._Iren.InvokeEvent("MouseMoveEvent")
+
+    def keyPressEvent(self, ev):
+        ctrl, shift, alt = self._GetCtrlShiftAlt(ev)
+        if ev.key() < 256:
+            key = str(ev.text())
+        else:
+            key = chr(0)
+
+        self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
+                                            ctrl, shift, key, 0, None)
+        self._Iren.SetAltKey(alt)
+        self._Iren.InvokeEvent("KeyPressEvent")
+        self._Iren.InvokeEvent("CharEvent")
+
+    def keyReleaseEvent(self, ev):
+        ctrl, shift, alt = self._GetCtrlShiftAlt(ev)
+        if ev.key() < 256:
+            key = chr(ev.key())
+        else:
+            key = chr(0)
+
+        self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
+                                            ctrl, shift, key, 0, None)
+        self._Iren.SetAltKey(alt)
+        self._Iren.InvokeEvent("KeyReleaseEvent")
+
+    def wheelEvent(self, ev):
+        print ("angleDeltaX %d" % ev.angleDelta().x())
+        print ("angleDeltaY %d" % ev.angleDelta().y())
+        if ev.angleDelta().y() >= 0:
+            self._Iren.InvokeEvent("MouseWheelForwardEvent")
+        else:
+            self._Iren.InvokeEvent("MouseWheelBackwardEvent")
+
+    def GetRenderWindow(self):
+        return self._RenderWindow
+
+    def Render(self):
+        self.update()
+
+
+def QVTKExample():    
+    """A simple example that uses the QVTKWidget class."""
+
+    # every QT app needs an app
+    app = QtWidgets.QApplication(['PyVE QVTKWidget Example'])
+    page_VTK = QtWidgets.QWidget()
+    page_VTK.resize(500,500)
+    layout = QtWidgets.QVBoxLayout(page_VTK)
+    # create the widget
+    widget = QVTKWidget(parent=None)
+    layout.addWidget(widget)
+    
+    #reader = vtk.vtkPNGReader()
+    #reader.SetFileName("F:\Diagnostics\Images\PyVE\VTKData\Data\camscene.png")
+    reader = vtk.vtkMetaImageReader()
+    reader.SetFileName("C:\\Users\\ofn77899\\Documents\\GitHub\\CCPi-Simpleflex\\data\\head.mha")
+    reader.Update()
+    
+    widget.SetInput(reader.GetOutput())
+    
+    # show the widget
+    page_VTK.show()
+    # start event processing
+    app.exec_()
+
+if __name__ == "__main__":
+    QVTKExample()
diff --git a/src/Python/ccpi/viewer/QVTKWidget2.py b/src/Python/ccpi/viewer/QVTKWidget2.py
new file mode 100644
index 0000000..e32e1c2
--- /dev/null
+++ b/src/Python/ccpi/viewer/QVTKWidget2.py
@@ -0,0 +1,84 @@
+################################################################################
+# File:         QVTKWidget.py
+# Author:       Edoardo Pasca
+# Description:  PyVE Viewer Qt widget
+#
+# License:
+#               This file is part of PyVE. PyVE is an open-source image 
+#               analysis and visualization environment focused on medical
+#               imaging. More info at http://pyve.sourceforge.net
+#	       
+#               Copyright (c) 2011-2012 Edoardo Pasca, Lukas Batteau 
+#               All rights reserved.
+#	       
+#              Redistribution and use in source and binary forms, with or
+#              without modification, are permitted provided that the following
+#              conditions are met:
+#
+#              Redistributions of source code must retain the above copyright
+#              notice, this list of conditions and the following disclaimer.
+#              Redistributions in binary form must reproduce the above
+#              copyright notice, this list of conditions and the following
+#              disclaimer in the documentation and/or other materials provided
+#              with the distribution.  Neither name of Edoardo Pasca or Lukas
+#              Batteau nor the names of any contributors may be used to endorse
+#              or promote products derived from this software without specific
+#              prior written permission.
+#
+#              THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+#              CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+#              INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#              MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+#              DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
+#              LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+#              OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#              PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+#              OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#              THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+#              TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+#              OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+#              OF SUCH DAMAGE.
+#
+# CHANGE HISTORY
+#
+# 20120118    Edoardo Pasca        Initial version
+#             
+###############################################################################
+
+import os
+from PyQt5 import QtCore, QtGui, QtWidgets
+#import itk
+import vtk
+#from viewer import PyveViewer
+from ccpi.viewer.CILViewer2D import CILViewer2D , Converter
+from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
+
+class QVTKWidget(QVTKRenderWindowInteractor):
+
+    
+    def __init__(self, parent=None, wflags=QtCore.Qt.WindowFlags(), **kw):
+        kw = dict() 
+        super().__init__(parent, **kw)
+        
+        
+        # Link to PyVE Viewer
+        self._PyveViewer = CILViewer2D(400,400)
+        #self._Viewer = self._PyveViewer._vtkPyveViewer
+        
+        self._Iren = self._PyveViewer.GetInteractor()
+        kw['iren'] = self._Iren
+        #self._Iren = self._Viewer.GetRenderWindow().GetInteractor()
+        self._RenderWindow = self._PyveViewer.GetRenderWindow()
+        #self._RenderWindow = self._Viewer.GetRenderWindow()
+        kw['rw'] = self._RenderWindow
+       
+        
+        
+       
+    def GetInteractor(self):
+        return self._Iren
+    
+    # Display image data
+    def SetInput(self, imageData):
+        self._PyveViewer.setInput3DData(imageData)
+    
\ No newline at end of file
diff --git a/src/Python/ccpi/viewer/__init__.py b/src/Python/ccpi/viewer/__init__.py
new file mode 100644
index 0000000..946188b
--- /dev/null
+++ b/src/Python/ccpi/viewer/__init__.py
@@ -0,0 +1 @@
+from ccpi.viewer.CILViewer import CILViewer
\ No newline at end of file
diff --git a/src/Python/ccpi/viewer/__pycache__/CILViewer.cpython-35.pyc b/src/Python/ccpi/viewer/__pycache__/CILViewer.cpython-35.pyc
new file mode 100644
index 0000000..711f77a
--- /dev/null
+++ b/src/Python/ccpi/viewer/__pycache__/CILViewer.cpython-35.pyc
diff --git a/src/Python/ccpi/viewer/__pycache__/CILViewer2D.cpython-35.pyc b/src/Python/ccpi/viewer/__pycache__/CILViewer2D.cpython-35.pyc
new file mode 100644
index 0000000..77c2ca8
--- /dev/null
+++ b/src/Python/ccpi/viewer/__pycache__/CILViewer2D.cpython-35.pyc
diff --git a/src/Python/ccpi/viewer/__pycache__/QVTKWidget.cpython-35.pyc b/src/Python/ccpi/viewer/__pycache__/QVTKWidget.cpython-35.pyc
new file mode 100644
index 0000000..3d11b87
--- /dev/null
+++ b/src/Python/ccpi/viewer/__pycache__/QVTKWidget.cpython-35.pyc
diff --git a/src/Python/ccpi/viewer/__pycache__/QVTKWidget2.cpython-35.pyc b/src/Python/ccpi/viewer/__pycache__/QVTKWidget2.cpython-35.pyc
new file mode 100644
index 0000000..2fa2eaf
--- /dev/null
+++ b/src/Python/ccpi/viewer/__pycache__/QVTKWidget2.cpython-35.pyc
diff --git a/src/Python/ccpi/viewer/__pycache__/__init__.cpython-35.pyc b/src/Python/ccpi/viewer/__pycache__/__init__.cpython-35.pyc
new file mode 100644
index 0000000..fcea537
--- /dev/null
+++ b/src/Python/ccpi/viewer/__pycache__/__init__.cpython-35.pyc
diff --git a/src/Python/ccpi/viewer/embedvtk.py b/src/Python/ccpi/viewer/embedvtk.py
new file mode 100644
index 0000000..b5eb0a7
--- /dev/null
+++ b/src/Python/ccpi/viewer/embedvtk.py
@@ -0,0 +1,75 @@
+# -*- coding: utf-8 -*-
+"""
+Created on Thu Jul 27 12:18:58 2017
+
+@author: ofn77899
+"""
+
+#!/usr/bin/env python
+ 
+import sys
+import vtk
+from PyQt5 import QtCore, QtWidgets
+from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
+import QVTKWidget2
+ 
+class MainWindow(QtWidgets.QMainWindow):
+ 
+    def __init__(self, parent = None):
+        QtWidgets.QMainWindow.__init__(self, parent)
+ 
+        self.frame = QtWidgets.QFrame()
+ 
+        self.vl = QtWidgets.QVBoxLayout()
+#        self.vtkWidget = QVTKRenderWindowInteractor(self.frame)
+        
+        self.vtkWidget = QVTKWidget2.QVTKWidget(self.frame)
+        self.iren = self.vtkWidget.GetInteractor()
+        self.vl.addWidget(self.vtkWidget)
+        
+        
+        
+    
+        self.ren = vtk.vtkRenderer()
+        self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)
+#        self.iren = self.vtkWidget.GetRenderWindow().GetInteractor()
+# 
+#        # Create source
+#        source = vtk.vtkSphereSource()
+#        source.SetCenter(0, 0, 0)
+#        source.SetRadius(5.0)
+# 
+#        # Create a mapper
+#        mapper = vtk.vtkPolyDataMapper()
+#        mapper.SetInputConnection(source.GetOutputPort())
+# 
+#        # Create an actor
+#        actor = vtk.vtkActor()
+#        actor.SetMapper(mapper)
+# 
+#        self.ren.AddActor(actor)
+# 
+#        self.ren.ResetCamera()
+# 
+        self.frame.setLayout(self.vl)
+        self.setCentralWidget(self.frame)
+        reader = vtk.vtkMetaImageReader()
+        reader.SetFileName("C:\\Users\\ofn77899\\Documents\\GitHub\\CCPi-Simpleflex\\data\\head.mha")
+        reader.Update()
+        
+        self.vtkWidget.SetInput(reader.GetOutput())
+        
+        #self.vktWidget.Initialize()
+        #self.vktWidget.Start()
+        
+        self.show()
+        #self.iren.Initialize()
+ 
+ 
+if __name__ == "__main__":
+ 
+    app = QtWidgets.QApplication(sys.argv)
+ 
+    window = MainWindow()
+ 
+    sys.exit(app.exec_())
\ No newline at end of file