.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_gallery/feature_demo/text_snake.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download__gallery_feature_demo_text_snake.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr__gallery_feature_demo_text_snake.py:


Text snake
==========
Example showing a text with picking and custom layout.

In this example we use a little trick by splitting the text in one block
for each word, and use ``direction="ltr-ltr"``, which means both text
and blocks are layed out from left to right.

Then in the animate function we update the y-positions to make the
blocks move in a wave.

.. GENERATED FROM PYTHON SOURCE LINES 13-77



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_text_snake_001.webp
   :alt: text snake
   :srcset: /_gallery/feature_demo/images/sphx_glr_text_snake_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    from time import perf_counter

    from rendercanvas.auto import RenderCanvas, loop
    import pygfx as gfx
    import numpy as np


    renderer = gfx.renderers.WgpuRenderer(RenderCanvas())
    scene = gfx.Scene()


    # Create the text
    s = "Lorem **ipsum** dolor sit amet, consectetur *adipiscing* elit, sed do eiusmod tempor ..."
    text1 = gfx.Text(
        markdown=s.split(),
        font_size=10,
        direction="ltr-ltr",
        paragraph_spacing=0.3,
        material=gfx.TextMaterial(color="#fff", pick_write=True),
    )
    scene.add(text1)

    # Camera and controller
    camera = gfx.PerspectiveCamera(70, 16 / 9)
    camera.show_object(text1)
    controller = gfx.OrbitController(camera, register_events=renderer)

    # Put the scene in as box, with lights, for visual appeal.
    box = gfx.Mesh(
        gfx.box_geometry(1000, 1000, 1000),
        gfx.MeshPhongMaterial(),
    )
    scene.add(box)
    scene.add(gfx.AmbientLight())
    light = gfx.DirectionalLight(0.2)
    light.local.position = (0, 0, 1)
    scene.add(camera.add(light))


    @renderer.add_event_handler("pointer_down")
    def handle_event(event):
        info = event.pick_info
        if info["world_object"] is None:
            print("miss")
        else:
            for key, val in info.items():
                print(key, "=", val)


    def animate():
        yy = text1.geometry.positions.data[:, 1]
        tt = np.linspace(0, 10, len(yy))
        yy[:] = 10 * np.sin(tt + 2 * perf_counter())
        text1.geometry.positions.update_full()

        renderer.render(scene, camera)
        renderer.request_draw()


    if __name__ == "__main__":
        renderer.request_draw(animate)
        loop.run()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 9.155 seconds)


.. _sphx_glr_download__gallery_feature_demo_text_snake.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: text_snake.ipynb <text_snake.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: text_snake.py <text_snake.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: text_snake.zip <text_snake.zip>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_

.. only:: html

    Interactive example
    -------------------

    Try this example in your browser using Pyodide. Might not work with all examples and all devices. Check the output and your browser's console for details.

    .. raw:: html

        <iframe src="./../pyodide.html#text_snake.py"></iframe>