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

.. only:: html

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

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

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

.. _sphx_glr__gallery_validation_validate_alpha.py:


Reference Color
===============

This example draws squares of reference colors. These can be compared to
similar output from e.g. Matplotlib.

.. GENERATED FROM PYTHON SOURCE LINES 8-57



.. image-sg:: /_gallery/validation/images/sphx_glr_validate_alpha_001.webp
   :alt: validate alpha
   :srcset: /_gallery/validation/images/sphx_glr_validate_alpha_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



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

    canvas = RenderCanvas()
    renderer = gfx.WgpuRenderer(canvas, gamma_correction=1.0)

    n = 32
    dy = n / 4

    camera = gfx.OrthographicCamera()
    scene = gfx.Scene()
    scene.add(gfx.Background.from_color("#000"))


    plane = gfx.plane_geometry(1, dy)
    for i in range(n):
        alpha = (i + 1) / n
        # Blend
        m = gfx.Mesh(
            plane, gfx.MeshBasicMaterial(color="#fff", opacity=alpha, alpha_mode="blend")
        )
        m.local.x = i
        m.local.y = 0
        scene.add(m)
        # Dither bayer
        m = gfx.Mesh(
            plane,
            gfx.MeshBasicMaterial(color="#fff", opacity=alpha, alpha_mode="bayer"),
        )
        m.local.x = i
        m.local.y = 1 * dy
        scene.add(m)
        # Dither
        m = gfx.Mesh(
            plane, gfx.MeshBasicMaterial(color="#fff", opacity=alpha, alpha_mode="dither")
        )
        m.local.x = i
        m.local.y = 2 * dy
        scene.add(m)

    camera.show_object(scene, match_aspect=True)
    canvas.request_draw(lambda: renderer.render(scene, camera))


    if __name__ == "__main__":
        print(__doc__)
        loop.run()


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

   **Total running time of the script:** (0 minutes 0.684 seconds)


.. _sphx_glr_download__gallery_validation_validate_alpha.py:

.. only:: html

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

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

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

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

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

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

      :download:`Download zipped: validate_alpha.zip <validate_alpha.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#validate_alpha.py"></iframe>