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GtkGLExtVTKRenderWindow.py
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GtkGLExtVTKRenderWindow.py
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"""
Description:
This provides a VTK widget for pyGtk. This embeds a vtkRenderWindow
inside a GTK widget. This is based on GtkVTKRenderWindow.py.
The extensions here allow the use of gtkglext rather than gtkgl and
pygtk-2 rather than pygtk-0. It requires pygtk-2.0.0 or later.
There is a working example at the bottom.
Credits:
John Hunter <jdhunter@ace.bsd.uchicago.edu> developed and tested
this code based on VTK's GtkVTKRenderWindow.py and extended it to
work with pygtk-2.0.0.
License:
VTK license.
"""
import math, sys
import pygtk
pygtk.require('2.0')
import gtk
import gtk.gtkgl
from gtk import gdk
import vtk
class GtkGLExtVTKRenderWindowBase(gtk.gtkgl.DrawingArea):
""" A base class that enables one to embed a vtkRenderWindow into
a pyGTK widget. This class embeds the RenderWindow correctly.
Provided are some empty methods that can be overloaded to provide
a user defined interaction behaviour. The event handling
functions have names that are somewhat similar to the ones in the
vtkInteractorStyle class included with VTK. """
def __init__(self, *args):
gtk.gtkgl.DrawingArea.__init__(self)
self.set_double_buffered(gtk.FALSE)
self._RenderWindow = vtk.vtkRenderWindow()
# private attributes
self.__Created = 0
# used by the LOD actors
self._DesiredUpdateRate = 15
self._StillUpdateRate = 0.0001
self.ConnectSignals()
# need this to be able to handle key_press events.
self.set_flags(gtk.CAN_FOCUS)
# default size
self.set_size_request(300, 300)
def ConnectSignals(self):
self.connect("realize", self.OnRealize)
self.connect("expose_event", self.OnExpose)
self.connect("configure_event", self.OnConfigure)
self.connect("button_press_event", self.OnButtonDown)
self.connect("button_release_event", self.OnButtonUp)
self.connect("motion_notify_event", self.OnMouseMove)
self.connect("enter_notify_event", self.OnEnter)
self.connect("leave_notify_event", self.OnLeave)
self.connect("key_press_event", self.OnKeyPress)
self.connect("delete_event", self.OnDestroy)
self.add_events(gdk.EXPOSURE_MASK|
gdk.BUTTON_PRESS_MASK |
gdk.BUTTON_RELEASE_MASK |
gdk.KEY_PRESS_MASK |
gdk.POINTER_MOTION_MASK |
gdk.POINTER_MOTION_HINT_MASK |
gdk.ENTER_NOTIFY_MASK |
gdk.LEAVE_NOTIFY_MASK)
def GetRenderWindow(self):
return self._RenderWindow
def GetRenderer(self):
self._RenderWindow.GetRenderers().InitTraversal()
return self._RenderWindow.GetRenderers().GetNextItem()
def SetDesiredUpdateRate(self, rate):
"""Mirrors the method with the same name in
vtkRenderWindowInteractor."""
self._DesiredUpdateRate = rate
def GetDesiredUpdateRate(self):
"""Mirrors the method with the same name in
vtkRenderWindowInteractor."""
return self._DesiredUpdateRate
def SetStillUpdateRate(self, rate):
"""Mirrors the method with the same name in
vtkRenderWindowInteractor."""
self._StillUpdateRate = rate
def GetStillUpdateRate(self):
"""Mirrors the method with the same name in
vtkRenderWindowInteractor."""
return self._StillUpdateRate
def Render(self):
if self.__Created:
self._RenderWindow.Render()
def OnRealize(self, *args):
if self.__Created == 0:
# you can't get the xid without the window being realized.
self.realize()
if sys.platform=='win32':
win_id = str(self.widget.window.handle)
else:
win_id = str(self.widget.window.xid)
self._RenderWindow.SetWindowInfo(win_id)
self.__Created = 1
return gtk.TRUE
def Created(self):
return self.__Created
def OnConfigure(self, widget, event):
self.widget=widget
self._RenderWindow.SetSize(event.width, event.height)
self.Render()
return gtk.TRUE
def OnExpose(self, *args):
self.Render()
return gtk.TRUE
def OnDestroy(self, *args):
self.hide()
del self._RenderWindow
self.destroy()
return gtk.TRUE
def OnButtonDown(self, wid, event):
"""Mouse button pressed."""
self._RenderWindow.SetDesiredUpdateRate(self._DesiredUpdateRate)
return gtk.TRUE
def OnButtonUp(self, wid, event):
"""Mouse button released."""
self._RenderWindow.SetDesiredUpdateRate(self._StillUpdateRate)
return gtk.TRUE
def OnMouseMove(self, wid, event):
"""Mouse has moved."""
return gtk.TRUE
def OnEnter(self, wid, event):
"""Entering the vtkRenderWindow."""
return gtk.TRUE
def OnLeave(self, wid, event):
"""Leaving the vtkRenderWindow."""
return gtk.TRUE
def OnKeyPress(self, wid, event):
"""Key pressed."""
return gtk.TRUE
def OnKeyRelease(self, wid, event):
"Key released."
return gtk.TRUE
class GtkGLExtVTKRenderWindow(GtkGLExtVTKRenderWindowBase):
""" An example of a fully functional GtkGLExtVTKRenderWindow that
is based on the vtkRenderWidget.py provided with the VTK
sources."""
def __init__(self, *args):
GtkGLExtVTKRenderWindowBase.__init__(self)
self._CurrentRenderer = None
self._CurrentCamera = None
self._CurrentZoom = 1.0
self._CurrentLight = None
self._ViewportCenterX = 0
self._ViewportCenterY = 0
self._Picker = vtk.vtkCellPicker()
self._PickedAssembly = None
self._PickedProperty = vtk.vtkProperty()
self._PickedProperty.SetColor(1, 0, 0)
self._PrePickedProperty = None
self._OldFocus = None
# these record the previous mouse position
self._LastX = 0
self._LastY = 0
def OnButtonDown(self, wid, event):
self._RenderWindow.SetDesiredUpdateRate(self._DesiredUpdateRate)
return self.StartMotion(wid, event)
return gtk.TRUE
def OnButtonUp(self, wid, event):
self._RenderWindow.SetDesiredUpdateRate(self._StillUpdateRate)
return self.EndMotion(wid, event)
return gtk.TRUE
def OnMouseMove(self, wid, event=None):
if ((event.state & gdk.BUTTON1_MASK) == gdk.BUTTON1_MASK):
if ((event.state & gdk.SHIFT_MASK) == gdk.SHIFT_MASK):
m = self.get_pointer()
self.Pan(m[0], m[1])
else:
m = self.get_pointer()
self.Rotate(m[0], m[1])
elif ((event.state & gdk.BUTTON2_MASK) == gdk.BUTTON2_MASK):
m = self.get_pointer()
self.Pan(m[0], m[1])
elif ((event.state & gdk.BUTTON3_MASK) == gdk.BUTTON3_MASK):
m = self.get_pointer()
self.Zoom(m[0], m[1])
else:
return gtk.FALSE
return gtk.TRUE
def OnEnter(self, wid, event=None):
# a render hack because grab_focus blanks the renderwin
self.grab_focus()
w = self.get_pointer()
self.UpdateRenderer(w[0], w[1])
return gtk.TRUE
def OnKeyPress(self, wid, event=None):
#if (event.keyval == gdk.keyval_from_name("q") or
# event.keyval == gdk.keyval_from_name("Q")):
# gtk.mainquit()
if (event.keyval == gdk.keyval_from_name('r') or
event.keyval == gdk.keyval_from_name('R')):
self.Reset()
return gtk.TRUE
elif (event.keyval == gdk.keyval_from_name('w') or
event.keyval == gdk.keyval_from_name('W')):
self.Wireframe()
return gtk.TRUE
elif (event.keyval == gdk.keyval_from_name('s') or
event.keyval == gdk.keyval_from_name('S')):
self.Surface()
return gtk.TRUE
elif (event.keyval == gdk.keyval_from_name('p') or
event.keyval == gdk.keyval_from_name('P')):
m = self.get_pointer()
self.PickActor(m[0], m[1])
return gtk.TRUE
else:
return gtk.FALSE
def GetZoomFactor(self):
return self._CurrentZoom
def SetZoomFactor(self, zf):
self._CurrentZoom = zf
def GetPicker(self):
return self._Picker
def Render(self):
if (self._CurrentLight):
light = self._CurrentLight
light.SetPosition(self._CurrentCamera.GetPosition())
light.SetFocalPoint(self._CurrentCamera.GetFocalPoint())
GtkGLExtVTKRenderWindowBase.Render(self)
def UpdateRenderer(self,x,y):
"""
UpdateRenderer will identify the renderer under the mouse and set
up _CurrentRenderer, _CurrentCamera, and _CurrentLight.
"""
windowX,windowY = self.widget.window.get_size()
renderers = self._RenderWindow.GetRenderers()
numRenderers = renderers.GetNumberOfItems()
self._CurrentRenderer = None
renderers.InitTraversal()
for i in range(0,numRenderers):
renderer = renderers.GetNextItem()
vx,vy = (0,0)
if (windowX > 1):
vx = float(x)/(windowX-1)
if (windowY > 1):
vy = (windowY-float(y)-1)/(windowY-1)
(vpxmin,vpymin,vpxmax,vpymax) = renderer.GetViewport()
if (vx >= vpxmin and vx <= vpxmax and
vy >= vpymin and vy <= vpymax):
self._CurrentRenderer = renderer
self._ViewportCenterX = float(windowX)*(vpxmax-vpxmin)/2.0\
+vpxmin
self._ViewportCenterY = float(windowY)*(vpymax-vpymin)/2.0\
+vpymin
self._CurrentCamera = self._CurrentRenderer.GetActiveCamera()
lights = self._CurrentRenderer.GetLights()
lights.InitTraversal()
self._CurrentLight = lights.GetNextItem()
break
self._LastX = x
self._LastY = y
def GetCurrentRenderer(self):
if self._CurrentRenderer is None:
renderers = self._RenderWindow.GetRenderers()
numRenderers = renderers.GetNumberOfItems()
renderers.InitTraversal()
for i in range(0,numRenderers):
renderer = renderers.GetNextItem()
break
self._CurrentRenderer = renderer
return self._CurrentRenderer
def GetCurrentCamera(self):
if self._CurrentCamera is None:
renderer = self.GetCurrentRenderer()
self._CurrentCamera = renderer.GetActiveCamera()
return self._CurrentCamera
def StartMotion(self, wid, event=None):
x = event.x
y = event.y
self.UpdateRenderer(x,y)
return gtk.TRUE
def EndMotion(self, wid, event=None):
if self._CurrentRenderer:
self.Render()
return gtk.TRUE
def Rotate(self,x,y):
if self._CurrentRenderer:
self._CurrentCamera.Azimuth(self._LastX - x)
self._CurrentCamera.Elevation(y - self._LastY)
self._CurrentCamera.OrthogonalizeViewUp()
self._LastX = x
self._LastY = y
self._CurrentRenderer.ResetCameraClippingRange()
self.Render()
def Pan(self,x,y):
if self._CurrentRenderer:
renderer = self._CurrentRenderer
camera = self._CurrentCamera
(pPoint0,pPoint1,pPoint2) = camera.GetPosition()
(fPoint0,fPoint1,fPoint2) = camera.GetFocalPoint()
if (camera.GetParallelProjection()):
renderer.SetWorldPoint(fPoint0,fPoint1,fPoint2,1.0)
renderer.WorldToDisplay()
fx,fy,fz = renderer.GetDisplayPoint()
renderer.SetDisplayPoint(fx-x+self._LastX,
fy+y-self._LastY,
fz)
renderer.DisplayToWorld()
fx,fy,fz,fw = renderer.GetWorldPoint()
camera.SetFocalPoint(fx,fy,fz)
renderer.SetWorldPoint(pPoint0,pPoint1,pPoint2,1.0)
renderer.WorldToDisplay()
fx,fy,fz = renderer.GetDisplayPoint()
renderer.SetDisplayPoint(fx-x+self._LastX,
fy+y-self._LastY,
fz)
renderer.DisplayToWorld()
fx,fy,fz,fw = renderer.GetWorldPoint()
camera.SetPosition(fx,fy,fz)
else:
(fPoint0,fPoint1,fPoint2) = camera.GetFocalPoint()
# Specify a point location in world coordinates
renderer.SetWorldPoint(fPoint0,fPoint1,fPoint2,1.0)
renderer.WorldToDisplay()
# Convert world point coordinates to display coordinates
dPoint = renderer.GetDisplayPoint()
focalDepth = dPoint[2]
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,x,y):
if self._CurrentRenderer:
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):
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,x,y):
if self._CurrentRenderer:
renderer = self._CurrentRenderer
picker = self._Picker
windowX,windowY = self.widget.window.get_size()
picker.Pick(x,(windowY - y - 1),0.0,renderer)
assembly = picker.GetAssembly()
if (self._PickedAssembly != None and
self._PrePickedProperty != None):
self._PickedAssembly.SetProperty(self._PrePickedProperty)
# release hold of the property
self._PrePickedProperty.UnRegister(self._PrePickedProperty)
self._PrePickedProperty = None
if (assembly != None):
self._PickedAssembly = assembly
self._PrePickedProperty = self._PickedAssembly.GetProperty()
# hold onto the property
self._PrePickedProperty.Register(self._PrePickedProperty)
self._PickedAssembly.SetProperty(self._PickedProperty)
self.Render()
def main():
# The main window
window = gtk.Window()
window.set_title("A GtkGLExtVTKRenderWindow Demo!")
window.connect("destroy", gtk.mainquit)
window.connect("delete_event", gtk.mainquit)
window.set_border_width(10)
vtkgtk = GtkGLExtVTKRenderWindow()
vtkgtk.show()
vbox = gtk.VBox(spacing=3)
vbox.show()
vbox.pack_start(vtkgtk)
button = gtk.Button('My Button')
button.show()
vbox.pack_start(button)
window.add(vbox)
window.set_size_request(400, 400)
# The VTK stuff.
cone = vtk.vtkConeSource()
cone.SetResolution(80)
coneMapper = vtk.vtkPolyDataMapper()
coneMapper.SetInputConnection(cone.GetOutputPort())
#coneActor = vtk.vtkLODActor()
coneActor = vtk.vtkActor()
coneActor.SetMapper(coneMapper)
coneActor.GetProperty().SetColor(0.5, 0.5, 1.0)
ren = vtk.vtkRenderer()
vtkgtk.GetRenderWindow().AddRenderer(ren)
ren.AddActor(coneActor)
# show the main window and start event processing.
window.show()
gtk.mainloop()
if __name__ == "__main__":
main()