Commit a98c952a authored by Alex Tsui's avatar Alex Tsui

Port PyQt4 QVTKRenderWindowInteractor to PyQt5.

- Also remove PySide import because they don't support Qt5.
parent d12a9fa9
A simple VTK widget for PyQt v5, the Qt v5 bindings for Python.
See for Qt documentation, and for PyQt.
This class is based on the vtkGenericRenderWindowInteractor and is
therefore fairly powerful. It should also play nicely with the
vtk3DWidget code.
Created by Prabhu Ramachandran, May 2002
Based on David Gobbi's
Changes by Gerard Vermeulen Feb. 2003
Win32 support.
Changes by Gerard Vermeulen, May 2003
Bug fixes and better integration with the Qt framework.
Changes by Phil Thompson, Nov. 2006
Ported to PyQt v4.
Added support for wheel events.
Changes by Phil Thompson, Oct. 2007
Bug fixes.
Changes by Phil Thompson, Mar. 2008
Added cursor support.
Changes by Rodrigo Mologni, Sep. 2013 (Credit to Daniele Esposti)
Bug fix to PySide: Converts PyCObject to void pointer.
Changes by Alex Tsui, Apr. 2015
Port from PyQt4 widget.
from PyQt5.QtWidgets import QWidget
from PyQt5.QtWidgets import QSizePolicy
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import Qt
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtCore import QTimer
from PyQt5.QtCore import QObject
from PyQt5.QtCore import QSize
from PyQt5.QtCore import QEvent
except ImportError:
raise ImportError("Cannot load PyQt5")
import vtk
class QVTKRenderWindowInteractor(QWidget):
""" A QVTKRenderWindowInteractor for Python and Qt. Uses a
vtkGenericRenderWindowInteractor to handle the interactions. Use
GetRenderWindow() to get the vtkRenderWindow. Create with the
keyword stereo=1 in order to generate a stereo-capable window.
The user interface is summarized in vtkInteractorStyle.h:
- Keypress j / Keypress t: toggle between joystick (position
sensitive) and trackball (motion sensitive) styles. In joystick
style, motion occurs continuously as long as a mouse button is
pressed. In trackball style, motion occurs when the mouse button
is pressed and the mouse pointer moves.
- Keypress c / Keypress o: toggle between camera and object
(actor) modes. In camera mode, mouse events affect the camera
position and focal point. In object mode, mouse events affect
the actor that is under the mouse pointer.
- Button 1: rotate the camera around its focal point (if camera
mode) or rotate the actor around its origin (if actor mode). The
rotation is in the direction defined from the center of the
renderer's viewport towards the mouse position. In joystick mode,
the magnitude of the rotation is determined by the distance the
mouse is from the center of the render window.
- Button 2: pan the camera (if camera mode) or translate the actor
(if object mode). In joystick mode, the direction of pan or
translation is from the center of the viewport towards the mouse
position. In trackball mode, the direction of motion is the
direction the mouse moves. (Note: with 2-button mice, pan is
defined as <Shift>-Button 1.)
- Button 3: zoom the camera (if camera mode) or scale the actor
(if object mode). Zoom in/increase scale if the mouse position is
in the top half of the viewport; zoom out/decrease scale if the
mouse position is in the bottom half. In joystick mode, the amount
of zoom is controlled by the distance of the mouse pointer from
the horizontal centerline of the window.
- Keypress 3: toggle the render window into and out of stereo
mode. By default, red-blue stereo pairs are created. Some systems
support Crystal Eyes LCD stereo glasses; you have to invoke
SetStereoTypeToCrystalEyes() on the rendering window. Note: to
use stereo you also need to pass a stereo=1 keyword argument to
the constructor.
- Keypress e: exit the application.
- Keypress f: fly to the picked point
- Keypress p: perform a pick operation. The render window interactor
has an internal instance of vtkCellPicker that it uses to pick.
- Keypress r: reset the camera view along the current view
direction. Centers the actors and moves the camera so that all actors
are visible.
- Keypress s: modify the representation of all actors so that they
are surfaces.
- Keypress u: invoke the user-defined function. Typically, this
keypress will bring up an interactor that you can type commands in.
- Keypress w: modify the representation of all actors so that they
are wireframe.
# Map between VTK and Qt cursors.
0: Qt.ArrowCursor, # VTK_CURSOR_DEFAULT
1: Qt.ArrowCursor, # VTK_CURSOR_ARROW
2: Qt.SizeBDiagCursor, # VTK_CURSOR_SIZENE
3: Qt.SizeFDiagCursor, # VTK_CURSOR_SIZENWSE
4: Qt.SizeBDiagCursor, # VTK_CURSOR_SIZESW
5: Qt.SizeFDiagCursor, # VTK_CURSOR_SIZESE
6: Qt.SizeVerCursor, # VTK_CURSOR_SIZENS
7: Qt.SizeHorCursor, # VTK_CURSOR_SIZEWE
8: Qt.SizeAllCursor, # VTK_CURSOR_SIZEALL
9: Qt.PointingHandCursor, # VTK_CURSOR_HAND
10: Qt.CrossCursor, # VTK_CURSOR_CROSSHAIR
def __init__(self, parent=None, wflags=Qt.WindowFlags(), **kw):
# the current button
self._ActiveButton = Qt.NoButton
# private attributes
self.__saveX = 0
self.__saveY = 0
self.__saveModifiers = Qt.NoModifier
self.__saveButtons = Qt.NoButton
# do special handling of some keywords:
# stereo, rw
stereo = 0
if kw.has_key('stereo'):
if kw['stereo']:
stereo = 1
rw = None
if kw.has_key('rw'):
rw = kw['rw']
# create qt-level widget
QWidget.__init__(self, parent, wflags|Qt.MSWindowsOwnDC)
if rw: # user-supplied render window
self._RenderWindow = rw
self._RenderWindow = vtk.vtkRenderWindow()
WId = self.winId()
if type(WId).__name__ == 'PyCObject':
from ctypes import pythonapi, c_void_p, py_object
pythonapi.PyCObject_AsVoidPtr.restype = c_void_p
pythonapi.PyCObject_AsVoidPtr.argtypes = [py_object]
WId = pythonapi.PyCObject_AsVoidPtr(WId)
if stereo: # stereo mode
if kw.has_key('iren'):
self._Iren = kw['iren']
self._Iren = vtk.vtkGenericRenderWindowInteractor()
# do all the necessary qt setup
self.setMouseTracking(True) # get all mouse events
self.setSizePolicy(QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding))
self._Timer = QTimer(self)
self._Iren.AddObserver('CreateTimerEvent', self.CreateTimer)
self._Iren.AddObserver('DestroyTimerEvent', self.DestroyTimer)
#Create a hidden child widget and connect its destroyed signal to its
#parent ``Finalize`` slot. The hidden children will be destroyed before
#its parent thus allowing cleanup of VTK elements.
#self._hidden = QtGui.QWidget(self)
self._hidden = QWidget(self)
def __getattr__(self, attr):
"""Makes the object behave like a vtkGenericRenderWindowInteractor"""
if attr == '__vtk__':
return lambda t=self._Iren: t
elif hasattr(self._Iren, attr):
return getattr(self._Iren, attr)
raise AttributeError, self.__class__.__name__ + \
" has no attribute named " + attr
def Finalize(self):
Call internal cleanup method on VTK objects
def CreateTimer(self, obj, evt):
def DestroyTimer(self, obj, evt):
return 1
def TimerEvent(self):
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.
QTimer.singleShot(0, self.ShowCursor)
def HideCursor(self):
"""Hides the cursor."""
def ShowCursor(self):
"""Shows the cursor."""
vtk_cursor = self._Iren.GetRenderWindow().GetCurrentCursor()
qt_cursor = self._CURSOR_MAP.get(vtk_cursor, Qt.ArrowCursor)
def closeEvent(self, evt):
def sizeHint(self):
return QSize(400, 400)
def paintEngine(self):
return None
def paintEvent(self, ev):
def resizeEvent(self, ev):
w = self.width()
h = self.height()
vtk.vtkRenderWindow.SetSize(self._RenderWindow, w, h)
self._Iren.SetSize(w, h)
def _GetCtrlShift(self, ev):
ctrl = shift = False
if hasattr(ev, 'modifiers'):
if ev.modifiers() & Qt.ShiftModifier:
shift = True
if ev.modifiers() & Qt.ControlModifier:
ctrl = True
if self.__saveModifiers & Qt.ShiftModifier:
shift = True
if self.__saveModifiers & Qt.ControlModifier:
ctrl = True
return ctrl, shift
def enterEvent(self, ev):
ctrl, shift = self._GetCtrlShift(ev)
self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
ctrl, shift, chr(0), 0, None)
def leaveEvent(self, ev):
ctrl, shift = self._GetCtrlShift(ev)
self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
ctrl, shift, chr(0), 0, None)
def mousePressEvent(self, ev):
ctrl, shift = self._GetCtrlShift(ev)
repeat = 0
if ev.type() == QEvent.MouseButtonDblClick:
repeat = 1
self._Iren.SetEventInformationFlipY(ev.x(), ev.y(),
ctrl, shift, chr(0), repeat, None)
self._ActiveButton = ev.button()
if self._ActiveButton == Qt.LeftButton:
elif self._ActiveButton == Qt.RightButton:
elif self._ActiveButton == Qt.MidButton:
def mouseReleaseEvent(self, ev):
ctrl, shift = self._GetCtrlShift(ev)
self._Iren.SetEventInformationFlipY(ev.x(), ev.y(),
ctrl, shift, chr(0), 0, None)
if self._ActiveButton == Qt.LeftButton:
elif self._ActiveButton == Qt.RightButton:
elif self._ActiveButton == Qt.MidButton:
def mouseMoveEvent(self, ev):
self.__saveModifiers = ev.modifiers()
self.__saveButtons = ev.buttons()
self.__saveX = ev.x()
self.__saveY = ev.y()
ctrl, shift = self._GetCtrlShift(ev)
self._Iren.SetEventInformationFlipY(ev.x(), ev.y(),
ctrl, shift, chr(0), 0, None)
def keyPressEvent(self, ev):
ctrl, shift = self._GetCtrlShift(ev)
if ev.key() < 256:
key = str(ev.text())
key = chr(0)
self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
ctrl, shift, key, 0, None)
def keyReleaseEvent(self, ev):
ctrl, shift = self._GetCtrlShift(ev)
if ev.key() < 256:
key = chr(ev.key())
key = chr(0)
self._Iren.SetEventInformationFlipY(self.__saveX, self.__saveY,
ctrl, shift, key, 0, None)
def wheelEvent(self, ev):
if >= 0:
def GetRenderWindow(self):
return self._RenderWindow
def Render(self):
def QVTKRenderWidgetConeExample():
"""A simple example that uses the QVTKRenderWindowInteractor class."""
# every QT app needs an app
app = QApplication(['QVTKRenderWindowInteractor'])
# create the widget
widget = QVTKRenderWindowInteractor()
# if you dont want the 'q' key to exit comment this.
widget.AddObserver("ExitEvent", lambda o, e, a=app: a.quit())
ren = vtk.vtkRenderer()
cone = vtk.vtkConeSource()
coneMapper = vtk.vtkPolyDataMapper()
coneActor = vtk.vtkActor()
# show the widget
# start event processing
if __name__ == "__main__":
"""PyQt v5 widget for VTK."""
__all__ = ['QVTKRenderWindowInteractor']
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