Using a timerΒΆ

This example shows how to create a simple animation using a timer callback.

We will use a sphere actor that generates many spheres of different colors, radii and opacity. Then we will animate this actor by rotating and changing global opacity levels from inside a user defined callback.

The timer will call this user defined callback every 200 milliseconds. The application will exit after the callback has been called 100 times.

../_images/sphx_glr_viz_timers_001.png
import numpy as np
from fury import window, actor, ui
import itertools

xyz = 10 * np.random.rand(100, 3)
colors = np.random.rand(100, 4)
radii = np.random.rand(100) + 0.5

scene = window.Scene()

sphere_actor = actor.sphere(centers=xyz,
                            colors=colors,
                            radii=radii)

scene.add(sphere_actor)

showm = window.ShowManager(scene,
                           size=(900, 768), reset_camera=False,
                           order_transparent=True)

showm.initialize()

tb = ui.TextBlock2D(bold=True)

# use itertools to avoid global variables
counter = itertools.count()


def timer_callback(_obj, _event):
    cnt = next(counter)
    tb.message = "Let's count up to 100 and exit :" + str(cnt)
    showm.scene.azimuth(0.05 * cnt)
    sphere_actor.GetProperty().SetOpacity(cnt/100.)
    showm.render()
    if cnt == 100:
        showm.exit()


scene.add(tb)

# Run every 200 milliseconds
showm.add_timer_callback(True, 200, timer_callback)

showm.start()

window.record(showm.scene, size=(900, 768), out_path="viz_timer.png")

Total running time of the script: ( 1 minutes 4.927 seconds)

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