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699 lines
21 KiB
699 lines
21 KiB
"""
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A simple VTK widget for wxPython. Note that wxPython comes
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with its own wxVTKRenderWindow in wxPython.lib.vtk. Try both
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and see which one works better for you.
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Find wxPython info at http://wxPython.org
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Created by David Gobbi, December 2001
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Based on vtkTkRenderWindget.py
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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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wxVTKRenderWindow(parent, ID, stereo=0, [wx keywords]):
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You should create a wxPySimpleApp() or some other wx**App
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before creating the window.
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----------------------------------------
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Methods:
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Render()
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AddRenderer(ren)
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GetRenderers()
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GetRenderWindow()
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----------------------------------------
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Methods to override (all take a wxEvent):
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OnButtonDown(event) default: propagate event to Left, Right, Middle
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OnLeftDown(event) default: set _Mode to 'Rotate'
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OnRightDown(event) default: set _Mode to 'Zoom'
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OnMiddleDown(event) default: set _Mode to 'Pan'
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OnButtonUp(event) default: propagate event to L, R, M and unset _Mode
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OnLeftUp(event)
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OnRightUp(event)
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OnMiddleUp(event)
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OnMotion(event) default: call appropriate handler for _Mode
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OnEnterWindow(event) default: set focus to this window
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OnLeaveWindow(event) default: release focus
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OnKeyDown(event) default: [R]eset, [W]irefreme, [S]olid, [P]ick
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OnKeyUp(event)
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OnChar(event)
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OnSetFocus(event)
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OnKillFocus(event)
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OnSize(event)
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OnMove(event)
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OnPaint(event) default: Render()
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----------------------------------------
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Protected Members:
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_Mode: Current mode: 'Rotate', 'Zoom', 'Pan'
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_LastX, _LastY: The (x,y) coordinates of the previous event
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_CurrentRenderer: The renderer that was most recently clicked in
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_CurrentCamera: The camera for the current renderer
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----------------------------------------
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Private Members:
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__Handle: Handle to the window containing the vtkRenderWindow
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"""
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# import usual libraries
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import math, os, sys
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from wxPython.wx import *
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import vtk
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# a few configuration items, see what works best on your system
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# Use wxGLCanvas as base class instead of wxWindow.
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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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try:
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WX_USE_GL_CANVAS
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except NameError:
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if wxPlatform == '__WXMSW__':
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WX_USE_GLCANVAS = 0
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else:
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WX_USE_GLCANVAS = 1
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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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try:
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WX_USE_X_CAPTURE
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except NameError:
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if wxPlatform == '__WXMSW__':
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WX_USE_X_CAPTURE = 1
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else:
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WX_USE_X_CAPTURE = 0
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# end of configuration items
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if WX_USE_GLCANVAS:
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from wxPython.glcanvas import *
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baseClass = wxGLCanvas
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else:
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baseClass = wxWindow
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class wxVTKRenderWindow(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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def __init__(self, parent, ID, *args, **kw):
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# miscellaneous protected variables
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self._CurrentRenderer = None
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self._CurrentCamera = None
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self._CurrentZoom = 1.0
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self._CurrentLight = None
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self._ViewportCenterX = 0
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self._ViewportCenterY = 0
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self._Picker = vtk.vtkCellPicker()
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self._PickedActor = None
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self._PickedProperty = vtk.vtkProperty()
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self._PickedProperty.SetColor(1,0,0)
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self._PrePickedProperty = None
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# these record the previous mouse position
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self._LastX = 0
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self._LastY = 0
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# the current interaction mode (Rotate, Pan, Zoom, etc)
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self._Mode = None
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self._ActiveButton = None
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# private attributes
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self.__OldFocus = None
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# used by the LOD actors
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self._DesiredUpdateRate = 15
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self._StillUpdateRate = 0.0001
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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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stereo = 0
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if kw.has_key('stereo'):
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if kw['stereo']:
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stereo = 1
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del kw['stereo']
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position = wxDefaultPosition
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if kw.has_key('position'):
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position = kw['position']
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del kw['position']
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try:
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size = parent.GetSize()
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except AttributeError:
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size = wxDefaultSize
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if kw.has_key('size'):
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size = kw['size']
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del kw['size']
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if kw.has_key('width') and kw.has_key('height'):
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size = (kw['width'], kw['height'])
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del kw['width']
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del kw['height']
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# wxWANTS_CHARS says to give us e.g. TAB
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# wxNO_FULL_REPAINT_ON_RESIZE cuts down resize flicker under GTK
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style = wxWANTS_CHARS | wxNO_FULL_REPAINT_ON_RESIZE
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if kw.has_key('style'):
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style = style | kw['style']
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del kw['style']
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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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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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# initialize the wxWindow
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baseClass.__init__(self, parent, ID, position, size, style)
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# create the RenderWindow and initialize it
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self._RenderWindow = vtk.vtkRenderWindow()
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try:
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self._RenderWindow.SetSize(size.width, size.height)
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except AttributeError:
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self._RenderWindow.SetSize(size[0], size[1])
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if stereo:
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self._RenderWindow.StereoCapableWindowOn()
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self._RenderWindow.SetStereoTypeToCrystalEyes()
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self.__handle = None
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# refresh window by doing a Render
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EVT_PAINT(self, self.OnPaint)
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# turn off background erase to reduce flicker
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EVT_ERASE_BACKGROUND(self, lambda e: None)
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# Bind the events to the event converters
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EVT_RIGHT_DOWN(self, self._OnButtonDown)
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EVT_LEFT_DOWN(self, self._OnButtonDown)
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EVT_MIDDLE_DOWN(self, self._OnButtonDown)
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EVT_RIGHT_UP(self, self._OnButtonUp)
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EVT_LEFT_UP(self, self._OnButtonUp)
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EVT_MIDDLE_UP(self, self._OnButtonUp)
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EVT_MOTION(self, self.OnMotion)
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EVT_ENTER_WINDOW(self, self._OnEnterWindow)
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EVT_LEAVE_WINDOW(self, self._OnLeaveWindow)
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EVT_CHAR(self, self.OnChar)
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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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EVT_CHAR(self, self.OnKeyDown)
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EVT_KEY_UP(self, self.OnKeyUp)
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EVT_SIZE(self, self._OnSize)
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EVT_MOVE(self, self.OnMove)
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EVT_SET_FOCUS(self, self.OnSetFocus)
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EVT_KILL_FOCUS(self, self.OnKillFocus)
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def SetDesiredUpdateRate(self, rate):
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"""Mirrors the method with the same name in
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vtkRenderWindowInteractor."""
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self._DesiredUpdateRate = rate
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def GetDesiredUpdateRate(self):
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"""Mirrors the method with the same name in
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vtkRenderWindowInteractor."""
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return self._DesiredUpdateRate
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def SetStillUpdateRate(self, rate):
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"""Mirrors the method with the same name in
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vtkRenderWindowInteractor."""
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self._StillUpdateRate = rate
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def GetStillUpdateRate(self):
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"""Mirrors the method with the same name in
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vtkRenderWindowInteractor."""
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return self._StillUpdateRate
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def OnPaint(self,event):
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dc = wxPaintDC(self)
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self.Render()
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def _OnSize(self,event):
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if wxPlatform != '__WXMSW__':
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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._RenderWindow.SetSize(width, height)
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self.OnSize(event)
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self.Render()
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def OnSize(self, event):
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pass
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def OnMove(self,event):
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pass
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def _OnEnterWindow(self,event):
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self.UpdateRenderer(event)
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self.OnEnterWindow(event)
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def OnEnterWindow(self,event):
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if self.__OldFocus == None:
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self.__OldFocus = wxWindow_FindFocus()
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self.SetFocus()
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def _OnLeaveWindow(self,event):
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self.OnLeaveWindow(event)
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def OnLeaveWindow(self,event):
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if self.__OldFocus:
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self.__OldFocus.SetFocus()
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self.__OldFocus = None
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def OnSetFocus(self,event):
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pass
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def OnKillFocus(self,event):
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pass
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def _OnButtonDown(self,event):
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# helper function for capturing mouse until button released
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self._RenderWindow.SetDesiredUpdateRate(self._DesiredUpdateRate)
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if event.RightDown():
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button = "Right"
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elif event.LeftDown():
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button = "Left"
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elif event.MiddleDown():
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button = "Middle"
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else:
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button = None
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# save the button and capture mouse until the button is released
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if button and not self._ActiveButton:
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self._ActiveButton = button
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if WX_USE_X_CAPTURE:
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self.CaptureMouse()
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self.OnButtonDown(event)
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def OnButtonDown(self,event):
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if not self._Mode:
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# figure out what renderer the mouse is over
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self.UpdateRenderer(event)
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if event.LeftDown():
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self.OnLeftDown(event)
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elif event.RightDown():
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self.OnRightDown(event)
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elif event.MiddleDown():
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self.OnMiddleDown(event)
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def OnLeftDown(self,event):
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if not self._Mode:
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if event.ControlDown():
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self._Mode = "Zoom"
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elif event.ShiftDown():
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self._Mode = "Pan"
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else:
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self._Mode = "Rotate"
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def OnRightDown(self,event):
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if not self._Mode:
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self._Mode = "Zoom"
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def OnMiddleDown(self,event):
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if not self._Mode:
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self._Mode = "Pan"
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def _OnButtonUp(self,event):
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# helper function for releasing mouse capture
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self._RenderWindow.SetDesiredUpdateRate(self._StillUpdateRate)
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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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else:
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button = None
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# if the ActiveButton is realeased, then release mouse capture
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if self._ActiveButton and button == self._ActiveButton:
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if WX_USE_X_CAPTURE:
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self.ReleaseMouse()
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self._ActiveButton = None
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self.OnButtonUp(event)
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def OnButtonUp(self,event):
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if event.LeftUp():
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self.OnLeftUp(event)
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elif event.RightUp():
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self.OnRightUp(event)
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elif event.MiddleUp():
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self.OnMiddleUp(event)
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# if not interacting, then do nothing more
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if self._Mode:
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if self._CurrentRenderer:
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self.Render()
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self._Mode = None
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def OnLeftUp(self,event):
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pass
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def OnRightUp(self,event):
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pass
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def OnMiddleUp(self,event):
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pass
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def OnMotion(self,event):
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if self._Mode == "Pan":
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self.Pan(event)
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elif self._Mode == "Rotate":
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self.Rotate(event)
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elif self._Mode == "Zoom":
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self.Zoom(event)
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def OnChar(self,event):
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pass
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def OnKeyDown(self,event):
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if event.GetKeyCode() == ord('r'):
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self.Reset(event)
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if event.GetKeyCode() == ord('w'):
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self.Wireframe()
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if event.GetKeyCode() == ord('s'):
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self.Surface()
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if event.GetKeyCode() == ord('p'):
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self.PickActor(event)
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if event.GetKeyCode() < 256:
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self.OnChar(event)
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def OnKeyUp(self,event):
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pass
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def GetZoomFactor(self):
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return self._CurrentZoom
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def GetRenderWindow(self):
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return self._RenderWindow
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def GetPicker(self):
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return self._Picker
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def Render(self):
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if self._CurrentLight:
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light = self._CurrentLight
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light.SetPosition(self._CurrentCamera.GetPosition())
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light.SetFocalPoint(self._CurrentCamera.GetFocalPoint())
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if((not self.GetUpdateRegion().IsEmpty())or(self.__handle)):
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if self.__handle and self.__handle == self.GetHandle():
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self._RenderWindow.Render()
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elif self.GetHandle():
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# this means the user has reparented us
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# let's adapt to the new situation by doing the WindowRemap
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# dance
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self._RenderWindow.SetNextWindowInfo(str(self.GetHandle()))
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self._RenderWindow.WindowRemap()
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# store the new situation
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self.__handle = self.GetHandle()
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self._RenderWindow.Render()
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|
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def UpdateRenderer(self,event):
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"""
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UpdateRenderer will identify the renderer under the mouse and set
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up _CurrentRenderer, _CurrentCamera, and _CurrentLight.
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"""
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x = event.GetX()
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y = event.GetY()
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windowX, windowY = self._RenderWindow.GetSize()
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renderers = self._RenderWindow.GetRenderers()
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numRenderers = renderers.GetNumberOfItems()
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self._CurrentRenderer = None
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renderers.InitTraversal()
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for i in range(0,numRenderers):
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renderer = renderers.GetNextItem()
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vx,vy = (0,0)
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if (windowX > 1):
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vx = float(x)/(windowX-1)
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if (windowY > 1):
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vy = (windowY-float(y)-1)/(windowY-1)
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(vpxmin,vpymin,vpxmax,vpymax) = renderer.GetViewport()
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if (vx >= vpxmin and vx <= vpxmax and
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vy >= vpymin and vy <= vpymax):
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self._CurrentRenderer = renderer
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self._ViewportCenterX = float(windowX)*(vpxmax-vpxmin)/2.0\
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+vpxmin
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self._ViewportCenterY = float(windowY)*(vpymax-vpymin)/2.0\
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+vpymin
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self._CurrentCamera = self._CurrentRenderer.GetActiveCamera()
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lights = self._CurrentRenderer.GetLights()
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lights.InitTraversal()
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self._CurrentLight = lights.GetNextItem()
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break
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self._LastX = x
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self._LastY = y
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|
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def GetCurrentRenderer(self):
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return self._CurrentRenderer
|
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|
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def Rotate(self,event):
|
|
if self._CurrentRenderer:
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x = event.GetX()
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y = event.GetY()
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self._CurrentCamera.Azimuth(self._LastX - x)
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self._CurrentCamera.Elevation(y - self._LastY)
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self._CurrentCamera.OrthogonalizeViewUp()
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self._LastX = x
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self._LastY = y
|
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self._CurrentRenderer.ResetCameraClippingRange()
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self.Render()
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def Pan(self,event):
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|
if self._CurrentRenderer:
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x = event.GetX()
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y = event.GetY()
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renderer = self._CurrentRenderer
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camera = self._CurrentCamera
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(pPoint0,pPoint1,pPoint2) = camera.GetPosition()
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(fPoint0,fPoint1,fPoint2) = camera.GetFocalPoint()
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if (camera.GetParallelProjection()):
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renderer.SetWorldPoint(fPoint0,fPoint1,fPoint2,1.0)
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renderer.WorldToDisplay()
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fx,fy,fz = renderer.GetDisplayPoint()
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renderer.SetDisplayPoint(fx-x+self._LastX,
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fy+y-self._LastY,
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fz)
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renderer.DisplayToWorld()
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fx,fy,fz,fw = renderer.GetWorldPoint()
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camera.SetFocalPoint(fx,fy,fz)
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renderer.SetWorldPoint(pPoint0,pPoint1,pPoint2,1.0)
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renderer.WorldToDisplay()
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fx,fy,fz = renderer.GetDisplayPoint()
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renderer.SetDisplayPoint(fx-x+self._LastX,
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fy+y-self._LastY,
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fz)
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renderer.DisplayToWorld()
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fx,fy,fz,fw = renderer.GetWorldPoint()
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camera.SetPosition(fx,fy,fz)
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else:
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(fPoint0,fPoint1,fPoint2) = camera.GetFocalPoint()
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# Specify a point location in world coordinates
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renderer.SetWorldPoint(fPoint0,fPoint1,fPoint2,1.0)
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renderer.WorldToDisplay()
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# Convert world point coordinates to display coordinates
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dPoint = renderer.GetDisplayPoint()
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focalDepth = dPoint[2]
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|
|
aPoint0 = self._ViewportCenterX + (x - self._LastX)
|
|
aPoint1 = self._ViewportCenterY - (y - self._LastY)
|
|
|
|
renderer.SetDisplayPoint(aPoint0,aPoint1,focalDepth)
|
|
renderer.DisplayToWorld()
|
|
|
|
(rPoint0,rPoint1,rPoint2,rPoint3) = renderer.GetWorldPoint()
|
|
if (rPoint3 != 0.0):
|
|
rPoint0 = rPoint0/rPoint3
|
|
rPoint1 = rPoint1/rPoint3
|
|
rPoint2 = rPoint2/rPoint3
|
|
|
|
camera.SetFocalPoint((fPoint0 - rPoint0) + fPoint0,
|
|
(fPoint1 - rPoint1) + fPoint1,
|
|
(fPoint2 - rPoint2) + fPoint2)
|
|
|
|
camera.SetPosition((fPoint0 - rPoint0) + pPoint0,
|
|
(fPoint1 - rPoint1) + pPoint1,
|
|
(fPoint2 - rPoint2) + pPoint2)
|
|
|
|
self._LastX = x
|
|
self._LastY = y
|
|
|
|
self.Render()
|
|
|
|
def Zoom(self,event):
|
|
if self._CurrentRenderer:
|
|
x = event.GetX()
|
|
y = event.GetY()
|
|
|
|
renderer = self._CurrentRenderer
|
|
camera = self._CurrentCamera
|
|
|
|
zoomFactor = math.pow(1.02,(0.5*(self._LastY - y)))
|
|
self._CurrentZoom = self._CurrentZoom * zoomFactor
|
|
|
|
if camera.GetParallelProjection():
|
|
parallelScale = camera.GetParallelScale()/zoomFactor
|
|
camera.SetParallelScale(parallelScale)
|
|
else:
|
|
camera.Dolly(zoomFactor)
|
|
renderer.ResetCameraClippingRange()
|
|
|
|
self._LastX = x
|
|
self._LastY = y
|
|
|
|
self.Render()
|
|
|
|
def Reset(self,event=None):
|
|
if self._CurrentRenderer:
|
|
self._CurrentRenderer.ResetCamera()
|
|
|
|
self.Render()
|
|
|
|
def Wireframe(self):
|
|
actors = self._CurrentRenderer.GetActors()
|
|
numActors = actors.GetNumberOfItems()
|
|
actors.InitTraversal()
|
|
for i in range(0,numActors):
|
|
actor = actors.GetNextItem()
|
|
actor.GetProperty().SetRepresentationToWireframe()
|
|
|
|
self.Render()
|
|
|
|
def Surface(self):
|
|
actors = self._CurrentRenderer.GetActors()
|
|
numActors = actors.GetNumberOfItems()
|
|
actors.InitTraversal()
|
|
for i in range(0,numActors):
|
|
actor = actors.GetNextItem()
|
|
actor.GetProperty().SetRepresentationToSurface()
|
|
|
|
self.Render()
|
|
|
|
def PickActor(self,event):
|
|
if self._CurrentRenderer:
|
|
x = event.GetX()
|
|
y = event.GetY()
|
|
|
|
renderer = self._CurrentRenderer
|
|
picker = self._Picker
|
|
|
|
windowX, windowY = self._RenderWindow.GetSize()
|
|
picker.Pick(x,(windowY - y - 1),0.0,renderer)
|
|
actor = picker.GetActor()
|
|
|
|
if (self._PickedActor != None and
|
|
self._PrePickedProperty != None):
|
|
self._PickedActor.SetProperty(self._PrePickedProperty)
|
|
# release hold of the property
|
|
self._PrePickedProperty.UnRegister(self._PrePickedProperty)
|
|
self._PrePickedProperty = None
|
|
|
|
if (actor != None):
|
|
self._PickedActor = actor
|
|
self._PrePickedProperty = self._PickedActor.GetProperty()
|
|
# hold onto the property
|
|
self._PrePickedProperty.Register(self._PrePickedProperty)
|
|
self._PickedActor.SetProperty(self._PickedProperty)
|
|
|
|
self.Render()
|
|
|
|
#----------------------------------------------------------------------------
|
|
def wxVTKRenderWindowConeExample():
|
|
|
|
"""Like it says, just a simple example
|
|
"""
|
|
# every wx app needs an app
|
|
app = wxPySimpleApp()
|
|
|
|
# create the widget
|
|
frame = wxFrame(None, -1, "wxRenderWindow", size=wxSize(400,400))
|
|
widget = wxVTKRenderWindow(frame, -1)
|
|
|
|
ren = vtk.vtkRenderer()
|
|
widget.GetRenderWindow().AddRenderer(ren)
|
|
|
|
cone = vtk.vtkConeSource()
|
|
cone.SetResolution(8)
|
|
|
|
coneMapper = vtk.vtkPolyDataMapper()
|
|
coneMapper.SetInput(cone.GetOutput())
|
|
|
|
coneActor = vtk.vtkActor()
|
|
coneActor.SetMapper(coneMapper)
|
|
|
|
ren.AddActor(coneActor)
|
|
|
|
# show the window
|
|
|
|
frame.Show(1)
|
|
|
|
app.MainLoop()
|
|
|
|
if __name__ == "__main__":
|
|
wxVTKRenderWindowConeExample()
|
|
|
|
|