Using a timer

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.

/opt/homebrew/Caskroom/miniforge/base/envs/py39/lib/python3.9/site-packages/sphinx_gallery/gen_rst.py:722: UserWarning: We'll no longer accept the way you call the __init__ function in future versions of FURY.

Here's how to call the Function __init__: __init__(self_value, scene='value', title='value', size='value', png_magnify='value', reset_camera='value', order_transparent='value', interactor_style='value', stereo='value', multi_samples='value', max_peels='value', occlusion_ratio='value')

  exec(self.code, self.fake_main.__dict__)
/opt/homebrew/Caskroom/miniforge/base/envs/py39/lib/python3.9/site-packages/sphinx_gallery/gen_rst.py:722: UserWarning: We'll no longer accept the way you call the record function in future versions of FURY.

Here's how to call the Function record: record(scene='value', cam_pos='value', cam_focal='value', cam_view='value', out_path='value', path_numbering='value', n_frames='value', az_ang='value', magnification='value', size='value', reset_camera='value', screen_clip='value', stereo='value', verbose='value')

  exec(self.code, self.fake_main.__dict__)

import itertools

import numpy as np

import fury

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

scene = fury.window.Scene()

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

scene.add(sphere_actor)

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


tb = fury.ui.TextBlock2D(bold=True)

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


def timer_callback(_obj, _event):
    global timer_id
    cnt = next(counter)
    tb.message = "Let's count up to 300 and exit :" + str(cnt)
    showm.scene.azimuth(0.05 * cnt)
    sphere_actor.GetProperty().SetOpacity(cnt / 100.0)
    showm.render()

    if cnt == 10:
        # destroy the first timer and replace it with another faster timer
        showm.destroy_timer(timer_id)
        timer_id = showm.add_timer_callback(True, 10, timer_callback)

    if cnt == 300:
        # destroy the second timer and exit
        showm.destroy_timer(timer_id)
        showm.exit()


scene.add(tb)

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

showm.start()

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