714 lines
24 KiB
Python
714 lines
24 KiB
Python
"""
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A VTK RenderWindowInteractor widget for wxPython.
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Find wxPython info at http://wxPython.org
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Created by Prabhu Ramachandran, April 2002
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Based on wxVTKRenderWindow.py
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Fixes and updates by Charl P. Botha 2003-2008
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Updated to new wx namespace and some cleaning up by Andrea Gavana,
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December 2006
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"""
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"""
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Please see the example at the end of this file.
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----------------------------------------
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Creation:
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wxVTKRenderWindowInteractor(parent, ID, stereo=0, [wx keywords]):
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You should create a wx.App(False) or some other wx.App subclass
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before creating the window.
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Behaviour:
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Uses __getattr__ to make the wxVTKRenderWindowInteractor behave just
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like a vtkGenericRenderWindowInteractor.
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----------------------------------------
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"""
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# import usual libraries
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import math, os, sys
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import wx
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from vtkmodules.vtkRenderingCore import vtkRenderWindow
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from vtkmodules.vtkRenderingUI import vtkGenericRenderWindowInteractor
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# a few configuration items, see what works best on your system
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# Use GLCanvas as base class instead of wx.Window.
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# This is sometimes necessary under wxGTK or the image is blank.
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# (in wxWindows 2.3.1 and earlier, the GLCanvas had scroll bars)
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baseClass = wx.Window
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if wx.Platform == "__WXGTK__":
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import wx.glcanvas
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baseClass = wx.glcanvas.GLCanvas
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# Keep capturing mouse after mouse is dragged out of window
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# (in wxGTK 2.3.2 there is a bug that keeps this from working,
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# but it is only relevant in wxGTK if there are multiple windows)
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_useCapture = (wx.Platform == "__WXMSW__")
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# end of configuration items
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class EventTimer(wx.Timer):
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"""Simple wx.Timer class.
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"""
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def __init__(self, iren):
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"""Default class constructor.
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@param iren current render window
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"""
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wx.Timer.__init__(self)
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self.iren = iren
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def Notify(self):
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""" The timer has expired.
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"""
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self.iren.TimerEvent()
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class wxVTKRenderWindowInteractor(baseClass):
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"""
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A wxRenderWindow for wxPython.
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Use GetRenderWindow() to get the vtkRenderWindow.
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Create with the keyword stereo=1 in order to
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generate a stereo-capable window.
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"""
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# class variable that can also be used to request instances that use
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# stereo; this is overridden by the stereo=1/0 parameter. If you set
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# it to True, the NEXT instantiated object will attempt to allocate a
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# stereo visual. E.g.:
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# wxVTKRenderWindowInteractor.USE_STEREO = True
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# myRWI = wxVTKRenderWindowInteractor(parent, -1)
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USE_STEREO = False
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def __init__(self, parent, ID, *args, **kw):
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"""Default class constructor.
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@param parent parent window
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@param ID window id
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@param **kw wxPython keywords (position, size, style) plus the
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'stereo' keyword
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"""
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# private attributes
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self.__RenderWhenDisabled = 0
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# First do special handling of some keywords:
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# stereo, position, size, width, height, style
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try:
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stereo = bool(kw['stereo'])
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del kw['stereo']
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except KeyError:
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stereo = False
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try:
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position = kw['position']
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del kw['position']
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except KeyError:
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position = wx.DefaultPosition
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try:
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size = kw['size']
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del kw['size']
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except KeyError:
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try:
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size = parent.GetSize()
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except AttributeError:
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size = wx.DefaultSize
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# wx.WANTS_CHARS says to give us e.g. TAB
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# wx.NO_FULL_REPAINT_ON_RESIZE cuts down resize flicker under GTK
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style = wx.WANTS_CHARS | wx.NO_FULL_REPAINT_ON_RESIZE
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try:
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style = style | kw['style']
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del kw['style']
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except KeyError:
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pass
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# the enclosing frame must be shown under GTK or the windows
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# don't connect together properly
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if wx.Platform != '__WXMSW__':
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l = []
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p = parent
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while p: # make a list of all parents
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l.append(p)
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p = p.GetParent()
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l.reverse() # sort list into descending order
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for p in l:
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p.Show(1)
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if baseClass.__name__ == 'GLCanvas':
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# code added by cpbotha to enable stereo and double
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# buffering correctly where the user requests this; remember
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# that the glXContext in this case is NOT allocated by VTK,
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# but by WX, hence all of this.
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# Initialize GLCanvas with correct attriblist
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attribList = [wx.glcanvas.WX_GL_RGBA,
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wx.glcanvas.WX_GL_MIN_RED, 1,
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wx.glcanvas.WX_GL_MIN_GREEN, 1,
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wx.glcanvas.WX_GL_MIN_BLUE, 1,
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wx.glcanvas.WX_GL_DEPTH_SIZE, 16,
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wx.glcanvas.WX_GL_DOUBLEBUFFER]
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if stereo:
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attribList.append(wx.glcanvas.WX_GL_STEREO)
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try:
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baseClass.__init__(self, parent, ID, pos=position, size=size,
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style=style,
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attribList=attribList)
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except wx.PyAssertionError:
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# visual couldn't be allocated, so we go back to default
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baseClass.__init__(self, parent, ID, pos=position, size=size,
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style=style)
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if stereo:
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# and make sure everyone knows that the stereo
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# visual wasn't set.
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stereo = 0
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else:
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baseClass.__init__(self, parent, ID, pos=position, size=size,
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style=style)
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# create the RenderWindow and initialize it
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self._Iren = vtkGenericRenderWindowInteractor()
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self._Iren.SetRenderWindow( vtkRenderWindow() )
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self._Iren.AddObserver('CreateTimerEvent', self.CreateTimer)
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self._Iren.AddObserver('DestroyTimerEvent', self.DestroyTimer)
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self._Iren.GetRenderWindow().AddObserver('CursorChangedEvent',
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self.CursorChangedEvent)
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try:
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self._Iren.GetRenderWindow().SetSize(size.width, size.height)
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except AttributeError:
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self._Iren.GetRenderWindow().SetSize(size[0], size[1])
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if stereo:
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self._Iren.GetRenderWindow().StereoCapableWindowOn()
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self._Iren.GetRenderWindow().SetStereoTypeToCrystalEyes()
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self.__handle = None
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self.BindEvents()
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# with this, we can make sure that the reparenting logic in
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# Render() isn't called before the first OnPaint() has
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# successfully been run (and set up the VTK/WX display links)
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self.__has_painted = False
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# set when we have captured the mouse.
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self._own_mouse = False
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# used to store WHICH mouse button led to mouse capture
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self._mouse_capture_button = 0
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# A mapping for cursor changes.
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self._cursor_map = {0: wx.CURSOR_ARROW, # VTK_CURSOR_DEFAULT
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1: wx.CURSOR_ARROW, # VTK_CURSOR_ARROW
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2: wx.CURSOR_SIZENESW, # VTK_CURSOR_SIZENE
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3: wx.CURSOR_SIZENWSE, # VTK_CURSOR_SIZENWSE
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4: wx.CURSOR_SIZENESW, # VTK_CURSOR_SIZESW
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5: wx.CURSOR_SIZENWSE, # VTK_CURSOR_SIZESE
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6: wx.CURSOR_SIZENS, # VTK_CURSOR_SIZENS
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7: wx.CURSOR_SIZEWE, # VTK_CURSOR_SIZEWE
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8: wx.CURSOR_SIZING, # VTK_CURSOR_SIZEALL
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9: wx.CURSOR_HAND, # VTK_CURSOR_HAND
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10: wx.CURSOR_CROSS, # VTK_CURSOR_CROSSHAIR
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}
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def BindEvents(self):
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"""Binds all the necessary events for navigation, sizing,
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drawing.
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"""
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# refresh window by doing a Render
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self.Bind(wx.EVT_PAINT, self.OnPaint)
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# turn off background erase to reduce flicker
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self.Bind(wx.EVT_ERASE_BACKGROUND, lambda e: None)
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# Bind the events to the event converters
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self.Bind(wx.EVT_RIGHT_DOWN, self.OnButtonDown)
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self.Bind(wx.EVT_LEFT_DOWN, self.OnButtonDown)
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self.Bind(wx.EVT_MIDDLE_DOWN, self.OnButtonDown)
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self.Bind(wx.EVT_RIGHT_UP, self.OnButtonUp)
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self.Bind(wx.EVT_LEFT_UP, self.OnButtonUp)
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self.Bind(wx.EVT_MIDDLE_UP, self.OnButtonUp)
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self.Bind(wx.EVT_MOUSEWHEEL, self.OnMouseWheel)
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self.Bind(wx.EVT_MOTION, self.OnMotion)
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self.Bind(wx.EVT_ENTER_WINDOW, self.OnEnter)
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self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeave)
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# If we use EVT_KEY_DOWN instead of EVT_CHAR, capital versions
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# of all characters are always returned. EVT_CHAR also performs
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# other necessary keyboard-dependent translations.
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self.Bind(wx.EVT_CHAR, self.OnKeyDown)
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self.Bind(wx.EVT_KEY_UP, self.OnKeyUp)
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self.Bind(wx.EVT_SIZE, self.OnSize)
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# the wx 2.8.7.1 documentation states that you HAVE to handle
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# this event if you make use of CaptureMouse, which we do.
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if _useCapture and hasattr(wx, 'EVT_MOUSE_CAPTURE_LOST'):
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self.Bind(wx.EVT_MOUSE_CAPTURE_LOST,
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self.OnMouseCaptureLost)
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def __getattr__(self, attr):
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"""Makes the object behave like a
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vtkGenericRenderWindowInteractor.
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"""
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if attr == '__vtk__':
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return lambda t=self._Iren: t
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elif hasattr(self._Iren, attr):
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return getattr(self._Iren, attr)
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else:
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raise AttributeError(self.__class__.__name__ +
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" has no attribute named " + attr)
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def CreateTimer(self, obj, evt):
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""" Creates a timer.
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"""
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self._timer = EventTimer(self)
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self._timer.Start(10, True)
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def DestroyTimer(self, obj, evt):
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"""The timer is a one shot timer so will expire automatically.
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"""
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return 1
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def _CursorChangedEvent(self, obj, evt):
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"""Change the wx cursor if the renderwindow's cursor was
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changed.
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"""
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cur = self._cursor_map[obj.GetCurrentCursor()]
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c = wx.StockCursor(cur)
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self.SetCursor(c)
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def CursorChangedEvent(self, obj, evt):
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"""Called when the CursorChangedEvent fires on the render
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window."""
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# This indirection is needed since when the event fires, the
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# current cursor is not yet set so we defer this by which time
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# the current cursor should have been set.
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wx.CallAfter(self._CursorChangedEvent, obj, evt)
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def HideCursor(self):
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"""Hides the cursor."""
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c = wx.StockCursor(wx.CURSOR_BLANK)
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self.SetCursor(c)
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def ShowCursor(self):
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"""Shows the cursor."""
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rw = self._Iren.GetRenderWindow()
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cur = self._cursor_map[rw.GetCurrentCursor()]
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c = wx.StockCursor(cur)
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self.SetCursor(c)
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def GetDisplayId(self):
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"""Function to get X11 Display ID from WX and return it in a format
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that can be used by VTK Python.
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We query the X11 Display with a new call that was added in wxPython
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2.6.0.1. The call returns a SWIG object which we can query for the
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address and subsequently turn into an old-style SWIG-mangled string
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representation to pass to VTK.
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"""
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d = None
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try:
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d = wx.GetXDisplay()
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except AttributeError:
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# wx.GetXDisplay was added by Robin Dunn in wxPython 2.6.0.1
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# if it's not available, we can't pass it. In general,
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# things will still work; on some setups, it'll break.
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pass
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else:
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# wx returns None on platforms where wx.GetXDisplay is not relevant
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if d:
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d = hex(d)
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# On wxPython-2.6.3.2 and above there is no leading '0x'.
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if not d.startswith('0x'):
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d = '0x' + d
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# VTK wants it as: _xxxxxxxx_p_void (SWIG pointer)
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d = '_%s_%s\0' % (d[2:], 'p_void')
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return d
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def OnMouseCaptureLost(self, event):
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"""This is signalled when we lose mouse capture due to an
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external event, such as when a dialog box is shown. See the
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wx documentation.
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"""
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# the documentation seems to imply that by this time we've
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# already lost capture. I have to assume that we don't need
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# to call ReleaseMouse ourselves.
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if _useCapture and self._own_mouse:
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self._own_mouse = False
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def OnPaint(self,event):
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"""Handles the wx.EVT_PAINT event for
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wxVTKRenderWindowInteractor.
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"""
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# wx should continue event processing after this handler.
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# We call this BEFORE Render(), so that if Render() raises
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# an exception, wx doesn't re-call OnPaint repeatedly.
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event.Skip()
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dc = wx.PaintDC(self)
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# make sure the RenderWindow is sized correctly
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self._Iren.GetRenderWindow().SetSize(self.GetSize())
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# Tell the RenderWindow to render inside the wx.Window.
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if not self.__handle:
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# on relevant platforms, set the X11 Display ID
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d = self.GetDisplayId()
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if d and self.__has_painted:
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self._Iren.GetRenderWindow().SetDisplayId(d)
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# store the handle
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self.__handle = self.GetHandle()
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# and give it to VTK
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self._Iren.GetRenderWindow().SetWindowInfo(str(self.__handle))
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# now that we've painted once, the Render() reparenting logic
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# is safe
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self.__has_painted = True
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self.Render()
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def OnSize(self,event):
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"""Handles the wx.EVT_SIZE event for
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wxVTKRenderWindowInteractor.
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"""
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# event processing should continue (we call this before the
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# Render(), in case it raises an exception)
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event.Skip()
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try:
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width, height = event.GetSize()
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except:
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width = event.GetSize().width
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height = event.GetSize().height
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self._Iren.SetSize(width, height)
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self._Iren.ConfigureEvent()
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# this will check for __handle
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self.Render()
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def OnMotion(self,event):
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"""Handles the wx.EVT_MOTION event for
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wxVTKRenderWindowInteractor.
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"""
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# event processing should continue
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# we call this early in case any of the VTK code raises an
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# exception.
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event.Skip()
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self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
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event.ControlDown(),
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event.ShiftDown(),
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chr(0), 0, None)
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self._Iren.MouseMoveEvent()
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def OnEnter(self,event):
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"""Handles the wx.EVT_ENTER_WINDOW event for
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wxVTKRenderWindowInteractor.
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"""
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# event processing should continue
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event.Skip()
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self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
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event.ControlDown(),
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event.ShiftDown(),
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chr(0), 0, None)
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self._Iren.EnterEvent()
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def OnLeave(self,event):
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"""Handles the wx.EVT_LEAVE_WINDOW event for
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wxVTKRenderWindowInteractor.
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"""
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# event processing should continue
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event.Skip()
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self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
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event.ControlDown(),
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event.ShiftDown(),
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chr(0), 0, None)
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self._Iren.LeaveEvent()
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def OnButtonDown(self,event):
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"""Handles the wx.EVT_LEFT/RIGHT/MIDDLE_DOWN events for
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wxVTKRenderWindowInteractor.
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"""
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# allow wx event processing to continue
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# on wxPython 2.6.0.1, omitting this will cause problems with
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# the initial focus, resulting in the wxVTKRWI ignoring keypresses
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# until we focus elsewhere and then refocus the wxVTKRWI frame
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# we do it this early in case any of the following VTK code
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# raises an exception.
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event.Skip()
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ctrl, shift = event.ControlDown(), event.ShiftDown()
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self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
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ctrl, shift, chr(0), 0, None)
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button = 0
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if event.RightDown():
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self._Iren.RightButtonPressEvent()
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button = 'Right'
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elif event.LeftDown():
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self._Iren.LeftButtonPressEvent()
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button = 'Left'
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elif event.MiddleDown():
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self._Iren.MiddleButtonPressEvent()
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button = 'Middle'
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# save the button and capture mouse until the button is released
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# we only capture the mouse if it hasn't already been captured
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if _useCapture and not self._own_mouse:
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self._own_mouse = True
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self._mouse_capture_button = button
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self.CaptureMouse()
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def OnButtonUp(self,event):
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"""Handles the wx.EVT_LEFT/RIGHT/MIDDLE_UP events for
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wxVTKRenderWindowInteractor.
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"""
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# event processing should continue
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event.Skip()
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button = 0
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if event.RightUp():
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button = 'Right'
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elif event.LeftUp():
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button = 'Left'
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elif event.MiddleUp():
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button = 'Middle'
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# if the same button is released that captured the mouse, and
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# we have the mouse, release it.
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# (we need to get rid of this as soon as possible; if we don't
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# and one of the event handlers raises an exception, mouse
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# is never released.)
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if _useCapture and self._own_mouse and \
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button==self._mouse_capture_button:
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self.ReleaseMouse()
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self._own_mouse = False
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ctrl, shift = event.ControlDown(), event.ShiftDown()
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self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
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ctrl, shift, chr(0), 0, None)
|
|
|
|
if button == 'Right':
|
|
self._Iren.RightButtonReleaseEvent()
|
|
elif button == 'Left':
|
|
self._Iren.LeftButtonReleaseEvent()
|
|
elif button == 'Middle':
|
|
self._Iren.MiddleButtonReleaseEvent()
|
|
|
|
|
|
def OnMouseWheel(self,event):
|
|
"""Handles the wx.EVT_MOUSEWHEEL event for
|
|
wxVTKRenderWindowInteractor.
|
|
"""
|
|
|
|
# event processing should continue
|
|
event.Skip()
|
|
|
|
ctrl, shift = event.ControlDown(), event.ShiftDown()
|
|
self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
|
|
ctrl, shift, chr(0), 0, None)
|
|
if event.GetWheelRotation() > 0:
|
|
self._Iren.MouseWheelForwardEvent()
|
|
else:
|
|
self._Iren.MouseWheelBackwardEvent()
|
|
|
|
|
|
def OnKeyDown(self,event):
|
|
"""Handles the wx.EVT_KEY_DOWN event for
|
|
wxVTKRenderWindowInteractor.
|
|
"""
|
|
|
|
# event processing should continue
|
|
event.Skip()
|
|
|
|
ctrl, shift = event.ControlDown(), event.ShiftDown()
|
|
keycode, keysym = event.GetKeyCode(), None
|
|
key = chr(0)
|
|
if keycode < 128:
|
|
key = chr(keycode)
|
|
|
|
# wxPython 2.6.0.1 does not return a valid event.Get{X,Y}()
|
|
# for this event, so we use the cached position.
|
|
(x,y)= self._Iren.GetEventPosition()
|
|
self._Iren.SetEventInformation(x, y,
|
|
ctrl, shift, key, 0,
|
|
keysym)
|
|
|
|
self._Iren.KeyPressEvent()
|
|
self._Iren.CharEvent()
|
|
|
|
|
|
def OnKeyUp(self,event):
|
|
"""Handles the wx.EVT_KEY_UP event for
|
|
wxVTKRenderWindowInteractor.
|
|
"""
|
|
|
|
# event processing should continue
|
|
event.Skip()
|
|
|
|
ctrl, shift = event.ControlDown(), event.ShiftDown()
|
|
keycode, keysym = event.GetKeyCode(), None
|
|
key = chr(0)
|
|
if keycode < 128:
|
|
key = chr(keycode)
|
|
|
|
self._Iren.SetEventInformationFlipY(event.GetX(), event.GetY(),
|
|
ctrl, shift, key, 0,
|
|
keysym)
|
|
self._Iren.KeyReleaseEvent()
|
|
|
|
|
|
def GetRenderWindow(self):
|
|
"""Returns the render window (vtkRenderWindow).
|
|
"""
|
|
return self._Iren.GetRenderWindow()
|
|
|
|
def Render(self):
|
|
"""Actually renders the VTK scene on screen.
|
|
"""
|
|
RenderAllowed = 1
|
|
|
|
if not self.__RenderWhenDisabled:
|
|
# the user doesn't want us to render when the toplevel frame
|
|
# is disabled - first find the top level parent
|
|
topParent = wx.GetTopLevelParent(self)
|
|
if topParent:
|
|
# if it exists, check whether it's enabled
|
|
# if it's not enabled, RenderAllowed will be false
|
|
RenderAllowed = topParent.IsEnabled()
|
|
|
|
if RenderAllowed:
|
|
if self.__handle and self.__handle == self.GetHandle():
|
|
self._Iren.GetRenderWindow().Render()
|
|
|
|
elif self.GetHandle() and self.__has_painted:
|
|
# this means the user has reparented us; let's adapt to the
|
|
# new situation by doing the WindowRemap dance
|
|
self._Iren.GetRenderWindow().SetNextWindowInfo(
|
|
str(self.GetHandle()))
|
|
|
|
# make sure the DisplayId is also set correctly
|
|
d = self.GetDisplayId()
|
|
if d:
|
|
self._Iren.GetRenderWindow().SetDisplayId(d)
|
|
|
|
# do the actual remap with the new parent information
|
|
self._Iren.GetRenderWindow().WindowRemap()
|
|
|
|
# store the new situation
|
|
self.__handle = self.GetHandle()
|
|
self._Iren.GetRenderWindow().Render()
|
|
|
|
def SetRenderWhenDisabled(self, newValue):
|
|
"""Change value of __RenderWhenDisabled ivar.
|
|
|
|
If __RenderWhenDisabled is false (the default), this widget will not
|
|
call Render() on the RenderWindow if the top level frame (i.e. the
|
|
containing frame) has been disabled.
|
|
|
|
This prevents recursive rendering during wx.SafeYield() calls.
|
|
wx.SafeYield() can be called during the ProgressMethod() callback of
|
|
a VTK object to have progress bars and other GUI elements updated -
|
|
it does this by disabling all windows (disallowing user-input to
|
|
prevent re-entrancy of code) and then handling all outstanding
|
|
GUI events.
|
|
|
|
However, this often triggers an OnPaint() method for wxVTKRWIs,
|
|
resulting in a Render(), resulting in Update() being called whilst
|
|
still in progress.
|
|
"""
|
|
self.__RenderWhenDisabled = bool(newValue)
|
|
|
|
|
|
#--------------------------------------------------------------------
|
|
def wxVTKRenderWindowInteractorConeExample():
|
|
"""Like it says, just a simple example
|
|
"""
|
|
|
|
from vtkmodules.vtkFiltersSources import vtkConeSource
|
|
from vtkmodules.vtkRenderingCore import vtkActor, vtkPolyDataMapper, vtkRenderer
|
|
# load implementations for rendering and interaction factory classes
|
|
import vtkmodules.vtkRenderingOpenGL2
|
|
import vtkmodules.vtkInteractionStyle
|
|
|
|
# every wx app needs an app
|
|
app = wx.App(False)
|
|
|
|
# create the top-level frame, sizer and wxVTKRWI
|
|
frame = wx.Frame(None, -1, "wxVTKRenderWindowInteractor", size=(400,400))
|
|
widget = wxVTKRenderWindowInteractor(frame, -1)
|
|
sizer = wx.BoxSizer(wx.VERTICAL)
|
|
sizer.Add(widget, 1, wx.EXPAND)
|
|
frame.SetSizer(sizer)
|
|
frame.Layout()
|
|
|
|
# It would be more correct (API-wise) to call widget.Initialize() and
|
|
# widget.Start() here, but Initialize() calls RenderWindow.Render().
|
|
# That Render() call will get through before we can setup the
|
|
# RenderWindow() to render via the wxWidgets-created context; this
|
|
# causes flashing on some platforms and downright breaks things on
|
|
# other platforms. Instead, we call widget.Enable(). This means
|
|
# that the RWI::Initialized ivar is not set, but in THIS SPECIFIC CASE,
|
|
# that doesn't matter.
|
|
widget.Enable(1)
|
|
|
|
widget.AddObserver("ExitEvent", lambda o,e,f=frame: f.Close())
|
|
|
|
ren = vtkRenderer()
|
|
widget.GetRenderWindow().AddRenderer(ren)
|
|
|
|
cone = vtkConeSource()
|
|
cone.SetResolution(8)
|
|
|
|
coneMapper = vtkPolyDataMapper()
|
|
coneMapper.SetInputConnection(cone.GetOutputPort())
|
|
|
|
coneActor = vtkActor()
|
|
coneActor.SetMapper(coneMapper)
|
|
|
|
ren.AddActor(coneActor)
|
|
|
|
# show the window
|
|
frame.Show()
|
|
|
|
app.MainLoop()
|
|
|
|
if __name__ == "__main__":
|
|
wxVTKRenderWindowInteractorConeExample()
|