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Simple animation using Python and VTK

   

import vtk
import random

import sys
sys.path.append("./modules")

from common import *
from sphere import *
from point import *
from cube import *

class vtkTimerCallback():
   def __init__(self):
     self.timer_count = 0
     self.actors = []
 
   def execute(self,obj,event):
     iren = obj
     wren = iren.GetRenderWindow()
     renderer = wren.GetRenderers().GetFirstRenderer()

     #print self.timer_count
     x, y, z = self.actors[0].GetCenter()

     if ((z-R) > botx):
       z = z - R

       print x, y, z

       renderer.RemoveActor(self.actors[0])
       self.actors.pop()

       sphereSource = vtk.vtkSphereSource()
       sphereSource.SetCenter(x, y, z)
       sphereSource.SetRadius(R)
                        
       #Create a mapper and actor
       mapper = vtk.vtkPolyDataMapper()
       mapper.SetInputConnection(sphereSource.GetOutputPort())
       self.actors.append(vtk.vtkActor())
       self.actors[0].SetMapper(mapper)
                                                                             
       renderer.AddActor(self.actors[0])
     else:
       print len(self.actors)

       if (len(self.actors) == 1):
         cx = x
         cy = y
         cz = topz - R
         
         sphereSource = vtk.vtkSphereSource()
         sphereSource.SetCenter(cx, cy, cz)
         sphereSource.SetRadius(R)
         
         #Create a mapper and actor
         mapper = vtk.vtkPolyDataMapper()
         mapper.SetInputConnection(sphereSource.GetOutputPort())
         self.actors.append(vtk.vtkActor())
         self.actors[1].SetMapper(mapper)
                                                                               
         renderer.AddActor(self.actors[1])
       elif (len(self.actors) == 2):
         x, y, z = self.actors[1].GetCenter()
         
         renderer.RemoveActor(self.actors[1])
         self.actors.pop()

         z = z - R

         sphereSource = vtk.vtkSphereSource()
         sphereSource.SetCenter(x, y, z)
         sphereSource.SetRadius(R)
                          
         #Create a mapper and actor
         mapper = vtk.vtkPolyDataMapper()
         mapper.SetInputConnection(sphereSource.GetOutputPort())
         self.actors.append(vtk.vtkActor())
         self.actors[1].SetMapper(mapper)
                                                                               
         renderer.AddActor(self.actors[1])

     iren.GetRenderWindow().Render()
     self.timer_count += 1
 
 
def main():
   #Create a sphere
   sphereSource = vtk.vtkSphereSource()

   cx = random.uniform(botx+R, topx-R)
   cy = random.uniform(boty+R, topy-R)
   cz = topz - R

   sphereSource.SetCenter(cx, cy, cz)
   sphereSource.SetRadius(R)

   # Setup a renderer, render window, and interactor
   renderer = vtk.vtkRenderer()
   renderWindow = vtk.vtkRenderWindow()
   #renderWindow.SetWindowName("Test")
 
   renderWindow.AddRenderer(renderer);
   renderWindowInteractor = vtk.vtkRenderWindowInteractor()
   renderWindowInteractor.SetRenderWindow(renderWindow)
 
   mapper = vtk.vtkPolyDataMapper()
   mapper.SetInputConnection(sphereSource.GetOutputPort())
   sactor = vtk.vtkActor()
   sactor.SetMapper(mapper)
   renderer.AddActor(sactor)

   # add cube
   sources = []

   addcube_to_source (sources, botx, boty, botz, \
       topx, topy, topz)

   for s in sources:
     mapper = vtk.vtkPolyDataMapper()
     mapper.SetInputConnection(s.GetOutputPort())
     actor = vtk.vtkActor()
     actor.SetMapper(mapper)
     renderer.AddActor(actor)

   #Render and interact
   renderWindow.Render()
 
   # Initialize must be called prior to creating timer events.
   renderWindowInteractor.Initialize()
 
   # Sign up to receive TimerEvent
   cb = vtkTimerCallback()
   cb.actors.append(sactor)
   renderWindowInteractor.AddObserver('TimerEvent', cb.execute)
   timerId = renderWindowInteractor.CreateRepeatingTimer(100);
 
   #start the interaction and timer
   renderWindowInteractor.Start()
 
 
if __name__ == '__main__':
   main()


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