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How to use _grabfocus method in pyatom

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vtkTkRenderWindowInteractor.py

Source:vtkTkRenderWindowInteractor.py

1"""2A fully functional VTK widget for Tkinter that uses3vtkGenericRenderWindowInteractor.  The widget is called4vtkTkRenderWindowInteractor.  The initialization part of this code is5similar to that of the vtkTkRenderWidget.6Created by Prabhu Ramachandran, April 20027"""8import Tkinter9import math, os, sys10import vtk11from vtkLoadPythonTkWidgets import vtkLoadPythonTkWidgets12class vtkTkRenderWindowInteractor(Tkinter.Widget):13    """ A vtkTkRenderWidndowInteractor for Python.14    Use GetRenderWindow() to get the vtkRenderWindow.15    Create with the keyword stereo=1 in order to generate a16    stereo-capable window.17    Create with the keyword focus_on_enter=1 to enable18    focus-follows-mouse.  The default is for a click-to-focus mode.19    __getattr__ is used to make the widget also behave like a20    vtkGenericRenderWindowInteractor.21    """22    def __init__(self, master, cnf={}, **kw):23        """24        Constructor.25        Keyword arguments:26          rw -- Use passed render window instead of creating a new one.27          stereo -- If True, generate a stereo-capable window.28          Defaults to False.29          focus_on_enter -- If True, use a focus-follows-mouse mode.30          Defaults to False where the widget will use a click-to-focus31          mode.32        """33        # load the necessary extensions into tk34        vtkLoadPythonTkWidgets(master.tk)35        try: # check to see if a render window was specified36            renderWindow = kw['rw']37        except KeyError:38            renderWindow = vtk.vtkRenderWindow()39        try:  # was a stereo rendering context requested?40            if kw['stereo']:41               renderWindow.StereoCapableWindowOn()42               del kw['stereo']43        except KeyError:44            pass45        # check if focus should follow mouse46        if kw.get('focus_on_enter'):47            self._FocusOnEnter = 148            del kw['focus_on_enter']49        else:50            self._FocusOnEnter = 051        kw['rw'] = renderWindow.GetAddressAsString("vtkRenderWindow")52        Tkinter.Widget.__init__(self, master, 'vtkTkRenderWidget', cnf, kw)53        self._Iren = vtk.vtkGenericRenderWindowInteractor()54        self._Iren.SetRenderWindow(self._RenderWindow)55        self._Iren.AddObserver('CreateTimerEvent', self.CreateTimer)56        self._Iren.AddObserver('DestroyTimerEvent', self.DestroyTimer)57        self._OldFocus = None58        # private attributes59        self.__InExpose = 060        # create the Tk bindings61        self.BindEvents()62        #self.tk_focusFollowsMouse()63    def __getattr__(self, attr):64        # because the tk part of vtkTkRenderWidget must have65        # the only remaining reference to the RenderWindow when66        # it is destroyed, we can't actually store the RenderWindow67        # as an attribute but instead have to get it from the tk-side68        if attr == '__vtk__':69            return lambda t=self._Iren: t70        elif attr == '_RenderWindow':71            return self.GetRenderWindow()72        elif hasattr(self._Iren, attr):73            return getattr(self._Iren, attr)74        else:75            raise AttributeError, self.__class__.__name__ + \76                  " has no attribute named " + attr77    def BindEvents(self):78        """ Bind all the events.  """79        self.bind("<Motion>",80                  lambda e, s=self: s.MouseMoveEvent(e, 0, 0))81        self.bind("<Control-Motion>",82                  lambda e, s=self: s.MouseMoveEvent(e, 1, 0))83        self.bind("<Shift-Motion>",84                  lambda e, s=self: s.MouseMoveEvent(e, 1, 1))85        self.bind("<Control-Shift-Motion>",86                  lambda e, s=self: s.MouseMoveEvent(e, 0, 1))87        # Left Button88        self.bind("<ButtonPress-1>",89                  lambda e, s=self: s.LeftButtonPressEvent(e, 0, 0))90        self.bind("<Control-ButtonPress-1>",91                  lambda e, s=self: s.LeftButtonPressEvent(e, 1, 0))92        self.bind("<Shift-ButtonPress-1>",93                  lambda e, s=self: s.LeftButtonPressEvent(e, 0, 1))94        self.bind("<Control-Shift-ButtonPress-1>",95                  lambda e, s=self: s.LeftButtonPressEvent(e, 1, 1))96        self.bind("<ButtonRelease-1>",97                  lambda e, s=self: s.LeftButtonReleaseEvent(e, 0, 0))98        self.bind("<Control-ButtonRelease-1>",99                  lambda e, s=self: s.LeftButtonReleaseEvent(e, 1, 0))100        self.bind("<Shift-ButtonRelease-1>",101                  lambda e, s=self: s.LeftButtonReleaseEvent(e, 0, 1))102        self.bind("<Control-Shift-ButtonRelease-1>",103                  lambda e, s=self: s.LeftButtonReleaseEvent(e, 1, 1))104        # Middle Button105        self.bind("<ButtonPress-2>",106                  lambda e, s=self: s.MiddleButtonPressEvent(e, 0, 0))107        self.bind("<Control-ButtonPress-2>",108                  lambda e, s=self: s.MiddleButtonPressEvent(e, 1, 0))109        self.bind("<Shift-ButtonPress-2>",110                  lambda e, s=self: s.MiddleButtonPressEvent(e, 0, 1))111        self.bind("<Control-Shift-ButtonPress-2>",112                  lambda e, s=self: s.MiddleButtonPressEvent(e, 1, 1))113        self.bind("<ButtonRelease-2>",114                  lambda e, s=self: s.MiddleButtonReleaseEvent(e, 0, 0))115        self.bind("<Control-ButtonRelease-2>",116                  lambda e, s=self: s.MiddleButtonReleaseEvent(e, 1, 0))117        self.bind("<Shift-ButtonRelease-2>",118                  lambda e, s=self: s.MiddleButtonReleaseEvent(e, 0, 1))119        self.bind("<Control-Shift-ButtonRelease-2>",120                  lambda e, s=self: s.MiddleButtonReleaseEvent(e, 1, 1))121        # Right Button122        self.bind("<ButtonPress-3>",123                  lambda e, s=self: s.RightButtonPressEvent(e, 0, 0))124        self.bind("<Control-ButtonPress-3>",125                  lambda e, s=self: s.RightButtonPressEvent(e, 1, 0))126        self.bind("<Shift-ButtonPress-3>",127                  lambda e, s=self: s.RightButtonPressEvent(e, 0, 1))128        self.bind("<Control-Shift-ButtonPress-3>",129                  lambda e, s=self: s.RightButtonPressEvent(e, 1, 1))130        self.bind("<ButtonRelease-3>",131                  lambda e, s=self: s.RightButtonReleaseEvent(e, 0, 0))132        self.bind("<Control-ButtonRelease-3>",133                  lambda e, s=self: s.RightButtonReleaseEvent(e, 1, 0))134        self.bind("<Shift-ButtonRelease-3>",135                  lambda e, s=self: s.RightButtonReleaseEvent(e, 0, 1))136        self.bind("<Control-Shift-ButtonRelease-3>",137                  lambda e, s=self: s.RightButtonReleaseEvent(e, 1, 1))138        if sys.platform == 'win32':139          self.bind("<MouseWheel>",140                    lambda e, s=self: s.MouseWheelEvent(e, 0, 0))141          self.bind("<Control-MouseWheel>",142                    lambda e, s=self: s.MouseWheelEvent(e, 1, 0))143          self.bind("<Shift-MouseWheel>",144                    lambda e, s=self: s.MouseWheelEvent(e, 0, 1))145          self.bind("<Control-Shift-MouseWheel>",146                    lambda e, s=self: s.MouseWheelEvent(e, 1, 1))147        else:148          # Mouse wheel forward event149          self.bind("<ButtonPress-4>",150                    lambda e, s=self: s.MouseWheelForwardEvent(e, 0, 0))151          self.bind("<Control-ButtonPress-4>",152                    lambda e, s=self: s.MouseWheelForwardEvent(e, 1, 0))153          self.bind("<Shift-ButtonPress-4>",154                    lambda e, s=self: s.MouseWheelForwardEvent(e, 0, 1))155          self.bind("<Control-Shift-ButtonPress-4>",156                    lambda e, s=self: s.MouseWheelForwardEvent(e, 1, 1))157          # Mouse wheel backward event158          self.bind("<ButtonPress-5>",159                    lambda e, s=self: s.MouseWheelBackwardEvent(e, 0, 0))160          self.bind("<Control-ButtonPress-5>",161                    lambda e, s=self: s.MouseWheelBackwardEvent(e, 1, 0))162          self.bind("<Shift-ButtonPress-5>",163                    lambda e, s=self: s.MouseWheelBackwardEvent(e, 0, 1))164          self.bind("<Control-Shift-ButtonPress-5>",165                    lambda e, s=self: s.MouseWheelBackwardEvent(e, 1, 1))166        # Key related events167        self.bind("<KeyPress>",168                  lambda e, s=self: s.KeyPressEvent(e, 0, 0))169        self.bind("<Control-KeyPress>",170                  lambda e, s=self: s.KeyPressEvent(e, 1, 0))171        self.bind("<Shift-KeyPress>",172                  lambda e, s=self: s.KeyPressEvent(e, 0, 1))173        self.bind("<Control-Shift-KeyPress>",174                  lambda e, s=self: s.KeyPressEvent(e, 1, 1))175        self.bind("<KeyRelease>",176                  lambda e, s=self: s.KeyReleaseEvent(e, 0, 0))177        self.bind("<Control-KeyRelease>",178                  lambda e, s=self: s.KeyReleaseEvent(e, 1, 0))179        self.bind("<Shift-KeyRelease>",180                  lambda e, s=self: s.KeyReleaseEvent(e, 0, 1))181        self.bind("<Control-Shift-KeyRelease>",182                  lambda e, s=self: s.KeyReleaseEvent(e, 1, 1))183        self.bind("<Enter>",184                  lambda e, s=self: s.EnterEvent(e, 0, 0))185        self.bind("<Control-Enter>",186                  lambda e, s=self: s.EnterEvent(e, 1, 0))187        self.bind("<Shift-Enter>",188                  lambda e, s=self: s.EnterEvent(e, 0, 1))189        self.bind("<Control-Shift-Enter>",190                  lambda e, s=self: s.EnterEvent(e, 1, 1))191        self.bind("<Leave>",192                  lambda e, s=self: s.LeaveEvent(e, 0, 0))193        self.bind("<Control-Leave>",194                  lambda e, s=self: s.LeaveEvent(e, 1, 0))195        self.bind("<Shift-Leave>",196                  lambda e, s=self: s.LeaveEvent(e, 0, 1))197        self.bind("<Control-Shift-Leave>",198                  lambda e, s=self: s.LeaveEvent(e, 1, 1))199        self.bind("<Configure>", self.ConfigureEvent)200        self.bind("<Expose>",lambda e,s=self: s.ExposeEvent())201    def CreateTimer(self, obj, evt):202        self.after(10, self._Iren.TimerEvent)203    def DestroyTimer(self, obj, event):204        """The timer is a one shot timer so will expire automatically."""205        return 1206    def _GrabFocus(self, enter=0):207        self._OldFocus=self.focus_get()208        self.focus()209    def MouseMoveEvent(self, event, ctrl, shift):210        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,211                                            shift, chr(0), 0, None)212        self._Iren.MouseMoveEvent()213    def LeftButtonPressEvent(self, event, ctrl, shift):214        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,215                                            shift, chr(0), 0, None)216        self._Iren.LeftButtonPressEvent()217        if not self._FocusOnEnter:218            self._GrabFocus()219    def LeftButtonReleaseEvent(self, event, ctrl, shift):220        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,221                                            shift, chr(0), 0, None)222        self._Iren.LeftButtonReleaseEvent()223    def MiddleButtonPressEvent(self, event, ctrl, shift):224        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,225                                            shift, chr(0), 0, None)226        self._Iren.MiddleButtonPressEvent()227        if not self._FocusOnEnter:228            self._GrabFocus()229    def MiddleButtonReleaseEvent(self, event, ctrl, shift):230        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,231                                            shift, chr(0), 0, None)232        self._Iren.MiddleButtonReleaseEvent()233    def RightButtonPressEvent(self, event, ctrl, shift):234        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,235                                            shift, chr(0), 0, None)236        self._Iren.RightButtonPressEvent()237        if not self._FocusOnEnter:238            self._GrabFocus()239    def RightButtonReleaseEvent(self, event, ctrl, shift):240        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,241                                            shift, chr(0), 0, None)242        self._Iren.RightButtonReleaseEvent()243    def MouseWheelEvent(self, event, ctrl, shift):244        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,245                                            shift, chr(0), 0, None)246        if event.delta > 0:247          self._Iren.MouseWheelForwardEvent()248        else:249          self._Iren.MouseWheelBackwardEvent()250    def MouseWheelForwardEvent(self, event, ctrl, shift):251        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,252                                            shift, chr(0), 0, None)253        self._Iren.MouseWheelForwardEvent()254    def MouseWheelBackwardEvent(self, event, ctrl, shift):255        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,256                                            shift, chr(0), 0, None)257        self._Iren.MouseWheelBackwardEvent()258    def KeyPressEvent(self, event, ctrl, shift):259        key = chr(0)260        if event.keysym_num < 256:261            key = chr(event.keysym_num)262        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,263                                            shift, key, 0, event.keysym)264        self._Iren.KeyPressEvent()265        self._Iren.CharEvent()266    def KeyReleaseEvent(self, event, ctrl, shift):267        key = chr(0)268        if event.keysym_num < 256:269            key = chr(event.keysym_num)270        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl,271                                            shift, key, 0, event.keysym)272        self._Iren.KeyReleaseEvent()273    def ConfigureEvent(self, event):274        self._Iren.SetSize(event.width, event.height)275        self._Iren.ConfigureEvent()276    def EnterEvent(self, event, ctrl, shift):277        if self._FocusOnEnter:278            self._GrabFocus()279        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl, shift,280                                            chr(0), 0, None)281        self._Iren.EnterEvent()282    def LeaveEvent(self, event, ctrl, shift):283        if self._FocusOnEnter and (self._OldFocus != None):284            self._OldFocus.focus()285        self._Iren.SetEventInformationFlipY(event.x, event.y, ctrl, shift,286                                            chr(0), 0, None)287        self._Iren.LeaveEvent()288    def ExposeEvent(self):289        if (not self.__InExpose):290            self.__InExpose = 1291            if (not self._RenderWindow.IsA('vtkCocoaRenderWindow')):292                self.update()293            self._RenderWindow.Render()294            self.__InExpose = 0295    def GetRenderWindow(self):296        addr = self.tk.call(self._w, 'GetRenderWindow')[5:]297        return vtk.vtkRenderWindow('_%s_vtkRenderWindow_p' % addr)298    def Render(self):299        self._RenderWindow.Render()300#----------------------------------------------------------------------------301def vtkRenderWindowInteractorConeExample():302    """Like it says, just a simple example303    """304    # create root window305    root = Tkinter.Tk()306    # create vtkTkRenderWidget307    pane = vtkTkRenderWindowInteractor(root, width=300, height=300)308    pane.Initialize()309    def quit(obj=root):310        obj.quit()311    pane.AddObserver("ExitEvent", lambda o,e,q=quit: q())312    ren = vtk.vtkRenderer()313    pane.GetRenderWindow().AddRenderer(ren)314    cone = vtk.vtkConeSource()315    cone.SetResolution(8)316    coneMapper = vtk.vtkPolyDataMapper()317    coneMapper.SetInputConnection(cone.GetOutputPort())318    coneActor = vtk.vtkActor()319    coneActor.SetMapper(coneMapper)320    ren.AddActor(coneActor)321    # pack the pane into the tk root322    pane.pack(fill='both', expand=1)323    pane.Start()324    # start the tk mainloop325    root.mainloop()326if __name__ == "__main__":...

vtkTkImageViewerWidget.py

Source:vtkTkImageViewerWidget.py

1"""2A vtkTkImageViewerWidget for python, which is based on the3vtkTkImageWindowWidget.4Specify double=1 to get a double-buffered window.5Created by David Gobbi, Nov 19996"""7import Tkinter8import math, os, sys9import vtk10from vtkLoadPythonTkWidgets import vtkLoadPythonTkWidgets11class vtkTkImageViewerWidget(Tkinter.Widget):12    """13    A vtkTkImageViewerWidget for Python.14    Use GetImageViewer() to get the vtkImageViewer.15    Create with the keyword double=1 in order to generate a16    double-buffered viewer.17    Create with the keyword focus_on_enter=1 to enable18    focus-follows-mouse.  The default is for a click-to-focus mode.19    """20    def __init__(self, master, cnf={}, **kw):21        """22        Constructor.23        Keyword arguments:24          iv -- Use passed image viewer instead of creating a new one.25          double -- If True, generate a double-buffered viewer.26          Defaults to False.27          focus_on_enter -- If True, use a focus-follows-mouse mode.28          Defaults to False where the widget will use a click-to-focus29          mode.30        """31        # load the necessary extensions into tk32        vtkLoadPythonTkWidgets(master.tk)33        try: # use specified vtkImageViewer34            imageViewer = kw['iv']35        except KeyError: # or create one if none specified36            imageViewer = vtk.vtkImageViewer()37        doubleBuffer = 038        try:39            if kw['double']:40                doubleBuffer = 141            del kw['double']42        except:43            pass44        # check if focus should follow mouse45        if kw.get('focus_on_enter'):46            self._FocusOnEnter = 147            del kw['focus_on_enter']48        else:49            self._FocusOnEnter = 050        kw['iv'] = imageViewer.GetAddressAsString("vtkImageViewer")51        Tkinter.Widget.__init__(self, master, 'vtkTkImageViewerWidget',52                                cnf, kw)53        if doubleBuffer:54            imageViewer.GetRenderWindow().DoubleBufferOn()55        self.BindTkImageViewer()56    def __getattr__(self,attr):57        # because the tk part of vtkTkImageViewerWidget must have58        # the only remaining reference to the ImageViewer when59        # it is destroyed, we can't actually store the ImageViewer60        # as an attribute but instead have to get it from the tk-side61        if attr == '_ImageViewer':62            addr = self.tk.call(self._w, 'GetImageViewer')[5:]63            return vtk.vtkImageViewer('_%s_vtkImageViewer_p' % addr)64        raise AttributeError, self.__class__.__name__ + \65              " has no attribute named " + attr66    def GetImageViewer(self):67        return self._ImageViewer68    def Render(self):69        self._ImageViewer.Render()70    def BindTkImageViewer(self):71        imager = self._ImageViewer.GetRenderer()72        # stuff for window level text.73        mapper = vtk.vtkTextMapper()74        mapper.SetInput("none")75        t_prop = mapper.GetTextProperty()76        t_prop.SetFontFamilyToTimes()77        t_prop.SetFontSize(18)78        t_prop.BoldOn()79        t_prop.ShadowOn()80        self._LevelMapper = mapper81        actor = vtk.vtkActor2D()82        actor.SetMapper(mapper)83        actor.SetLayerNumber(1)84        actor.GetPositionCoordinate().SetValue(4,22)85        actor.GetProperty().SetColor(1,1,0.5)86        actor.SetVisibility(0)87        imager.AddActor2D(actor)88        self._LevelActor = actor89        mapper = vtk.vtkTextMapper()90        mapper.SetInput("none")91        t_prop = mapper.GetTextProperty()92        t_prop.SetFontFamilyToTimes()93        t_prop.SetFontSize(18)94        t_prop.BoldOn()95        t_prop.ShadowOn()96        self._WindowMapper = mapper97        actor = vtk.vtkActor2D()98        actor.SetMapper(mapper)99        actor.SetLayerNumber(1)100        actor.GetPositionCoordinate().SetValue(4,4)101        actor.GetProperty().SetColor(1,1,0.5)102        actor.SetVisibility(0)103        imager.AddActor2D(actor)104        self._WindowActor = actor105        self._LastX = 0106        self._LastY = 0107        self._OldFocus = 0108        self._InExpose = 0109        # bindings110        # window level111        self.bind("<ButtonPress-1>",112                  lambda e,s=self: s.StartWindowLevelInteraction(e.x,e.y))113        self.bind("<B1-Motion>",114                  lambda e,s=self: s.UpdateWindowLevelInteraction(e.x,e.y))115        self.bind("<ButtonRelease-1>",116                  lambda e,s=self: s.EndWindowLevelInteraction())117        # Get the value118        self.bind("<ButtonPress-3>",119                  lambda e,s=self: s.StartQueryInteraction(e.x,e.y))120        self.bind("<B3-Motion>",121                  lambda e,s=self: s.UpdateQueryInteraction(e.x,e.y))122        self.bind("<ButtonRelease-3>",123                  lambda e,s=self: s.EndQueryInteraction())124        self.bind("<Expose>",125                  lambda e,s=self: s.ExposeTkImageViewer())126        self.bind("<Enter>",127                  lambda e,s=self: s.EnterTkViewer())128        self.bind("<Leave>",129                  lambda e,s=self: s.LeaveTkViewer())130        self.bind("<KeyPress-e>",131                  lambda e,s=self: s.quit())132        self.bind("<KeyPress-r>",133                  lambda e,s=self: s.ResetTkImageViewer())134    def GetImageViewer(self):135        return self._ImageViewer136    def Render(self):137        self._ImageViewer.Render()138    def _GrabFocus(self):139        self._OldFocus=self.focus_get()140        self.focus()141    def EnterTkViewer(self):142        if self._FocusOnEnter:143            self._GrabFocus()144    def LeaveTkViewer(self):145        if self._FocusOnEnter and (self._OldFocus != None):146            self._OldFocus.focus()147    def ExposeTkImageViewer(self):148        if (self._InExpose == 0):149            self._InExpose = 1150            if (not self._ImageViewer.GetRenderWindow().151                IsA('vtkCocoaRenderWindow')):152                self.update()153            self._ImageViewer.Render()154            self._InExpose = 0155    def StartWindowLevelInteraction(self,x,y):156        if not self._FocusOnEnter:157            self._GrabFocus()158        viewer = self._ImageViewer159        self._LastX = x160        self._LastY = y161        self._Window = float(viewer.GetColorWindow())162        self._Level = float(viewer.GetColorLevel())163        # make the window level text visible164        self._LevelActor.SetVisibility(1)165        self._WindowActor.SetVisibility(1)166        self.UpdateWindowLevelInteraction(x,y)167    def EndWindowLevelInteraction(self):168        # make the window level text invisible169        self._LevelActor.SetVisibility(0)170        self._WindowActor.SetVisibility(0)171        self.Render()172    def UpdateWindowLevelInteraction(self,x,y):173        # compute normalized delta174        dx = 4.0*(x - self._LastX)/self.winfo_width()*self._Window175        dy = 4.0*(self._LastY - y)/self.winfo_height()*self._Level176        # abs so that direction does not flip177        if (self._Window < 0.0):178            dx = -dx179        if (self._Level < 0.0):180            dy = -dy181        # compute new window level182        window = self._Window + dx183        if (window < 0.0):184            level = self._Level + dy185        else:186            level = self._Level - dy187        viewer = self._ImageViewer188        viewer.SetColorWindow(window)189        viewer.SetColorLevel(level)190        self._WindowMapper.SetInput("Window: %g" % window)191        self._LevelMapper.SetInput("Level: %g" % level)192        self.Render()193    def ResetTkImageViewer(self):194        # Reset: Set window level to show all values195        viewer = self._ImageViewer196        input = viewer.GetInput()197        if (input == None):198            return199        # Get the extent in viewer200        z = viewer.GetZSlice()201        input.SetUpdateExtent(-99999,99999,-99999,99999,z,z)202        input.Update()203        (low,high) = input.GetScalarRange()204        viewer.SetColorWindow(high - low)205        viewer.SetColorLevel((high + low) * 0.5)206        self.Render()207    def StartQueryInteraction(self,x,y):208        if not self._FocusOnEnter:209            self._GrabFocus()210        # Query PixleValue stuff211        self._WindowActor.SetVisibility(1)212        self.UpdateQueryInteraction(x,y)213    def EndQueryInteraction(self):214        self._WindowActor.SetVisibility(0)215        self.Render()216    def UpdateQueryInteraction(self,x,y):217        viewer = self._ImageViewer218        input = viewer.GetInput()219        z = viewer.GetZSlice()220        # y is flipped upside down221        y = self.winfo_height() - y222        # make sure point is in the extent of the image.223        (xMin,xMax,yMin,yMax,zMin,zMax) = input.GetExtent()224        if (x < xMin or x > xMax or y < yMin or \225            y > yMax or z < zMin or z > zMax):226            return227        numComps = input.GetNumberOfScalarComponents()228        text = ""229        for i in xrange(numComps):230            val = input.GetScalarComponentAsDouble(x,y,z,i)231            text = "%s  %.1f" % (text,val)232        self._WindowMapper.SetInput("(%d, %d): %s" % (x,y,text))233        self.Render()234#-----------------------------------------------------------------------------235# an example of how to use this widget236if __name__ == "__main__":237    canvas = vtk.vtkImageCanvasSource2D()238    canvas.SetNumberOfScalarComponents(3)239    canvas.SetScalarType(3)240    canvas.SetExtent(0,511,0,511,0,0)241    canvas.SetDrawColor(100,100,0)242    canvas.FillBox(0,511,0,511)243    canvas.SetDrawColor(200,0,200)244    canvas.FillBox(32,511,100,500)245    canvas.SetDrawColor(100,0,0)246    canvas.FillTube(550,20,30,400,5)247    canvas.SetDrawColor(255,255,255)248    canvas.DrawSegment3D(10,20,0,90,510,0)249    canvas.SetDrawColor(200,50,50)250    canvas.DrawSegment3D(510,90,0,10,20,0)251    # Check segment clipping252    canvas.SetDrawColor(0,200,0)253    canvas.DrawSegment(-10,30,30,-10)254    canvas.DrawSegment(-10,481,30,521)255    canvas.DrawSegment(481,-10,521,30)256    canvas.DrawSegment(481,521,521,481)257    # Check Filling a triangle258    canvas.SetDrawColor(20,200,200)259    canvas.FillTriangle(-100,100,190,150,40,300)260    # Check drawing a circle261    canvas.SetDrawColor(250,250,10)262    canvas.DrawCircle(350,350,200.0)263    # Check drawing a point264    canvas.SetDrawColor(250,250,250)265    canvas.DrawPoint(350,350)266    canvas.DrawPoint(350,550)267    # Test filling functionality268    canvas.SetDrawColor(55,0,0)269    canvas.DrawCircle(450,350,80.0)270    canvas.SetDrawColor(100,255,100)271    canvas.FillPixel(450,350)272    # Create the GUI: two renderer widgets and a quit button273    frame = Tkinter.Frame()274    widget = vtkTkImageViewerWidget(frame,width=512,height=512,double=1)275    viewer = widget.GetImageViewer()276    viewer.SetInputConnection(canvas.GetOutputPort())277    viewer.SetColorWindow(256)278    viewer.SetColorLevel(127.5)279    button = Tkinter.Button(frame,text="Quit",command=frame.quit)280    widget.pack(side='top',padx=3,pady=3,fill='both',expand='t')281    frame.pack(fill='both',expand='t')282    button.pack(fill='x')...

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