Animation

VTKExamples/Python/Utilities/Animation


Description

This example uses a timer to move a sphere across a scene.

  • Contributed by: Bryan Conrad

Other Languages

See (Cxx)

Code

Animation.py

from __future__ import print_function

import vtk


class vtkTimerCallback():
    def __init__(self, steps, actor, iren):
        self.timer_count = 0
        self.steps = steps
        self.actor = actor
        self.iren = iren
        self.timerId = None

    def execute(self, obj, event):
        step = 0
        while step < self.steps:
            print(self.timer_count)
            self.actor.SetPosition(self.timer_count / 100.0, self.timer_count / 100.0, 0)
            iren = obj
            iren.GetRenderWindow().Render()
            self.timer_count += 1
            step += 1
        if self.timerId:
            iren.DestroyTimer(self.timerId)


def main():
    colors = vtk.vtkNamedColors()

    # Create a sphere
    sphereSource = vtk.vtkSphereSource()
    sphereSource.SetCenter(0.0, 0.0, 0.0)
    sphereSource.SetRadius(2)
    sphereSource.SetPhiResolution(30)
    sphereSource.SetThetaResolution(30)

    # Create a mapper and actor
    mapper = vtk.vtkPolyDataMapper()
    mapper.SetInputConnection(sphereSource.GetOutputPort())
    actor = vtk.vtkActor()
    actor.GetProperty().SetColor(colors.GetColor3d("Peacock"))
    actor.GetProperty().SetSpecular(0.6)
    actor.GetProperty().SetSpecularPower(30)
    actor.SetMapper(mapper)
    # actor.SetPosition(-5, -5, 0)

    # Setup a renderer, render window, and interactor
    renderer = vtk.vtkRenderer()
    renderer.SetBackground(colors.GetColor3d("MistyRose"))
    renderWindow = vtk.vtkRenderWindow()
    renderWindow.SetWindowName("Animation")

    renderWindow.AddRenderer(renderer)
    renderWindowInteractor = vtk.vtkRenderWindowInteractor()
    renderWindowInteractor.SetRenderWindow(renderWindow)

    # Add the actor to the scene
    renderer.AddActor(actor)

    # Render and interact
    renderWindow.Render()
    renderer.GetActiveCamera().Zoom(.8)
    renderWindow.Render()

    # Initialize must be called prior to creating timer events.
    renderWindowInteractor.Initialize()

    # Sign up to receive TimerEvent
    cb = vtkTimerCallback(200, actor, renderWindowInteractor)
    renderWindowInteractor.AddObserver('TimerEvent', cb.execute)
    cb.timerId = renderWindowInteractor.CreateRepeatingTimer(500)

    # start the interaction and timer
    renderWindow.Render()
    renderWindowInteractor.Start()

if __name__ == '__main__':
    main()