.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "_gallery/feature_demo/measure_distances_2d.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_measure_distances_2d.py>`
        to download the full example code.

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

.. _sphx_glr__gallery_feature_demo_measure_distances_2d.py:


Measure distances in 2D
=======================

Example to do measurements in a 2D image. Use LMB and RMB to place the
end-points.

.. GENERATED FROM PYTHON SOURCE LINES 8-55



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_measure_distances_2d_001.webp
   :alt: measure distances 2d
   :srcset: /_gallery/feature_demo/images/sphx_glr_measure_distances_2d_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



    import numpy as np
    import imageio.v3 as iio
    from rendercanvas.auto import RenderCanvas, loop
    import pygfx as gfx


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


    im = iio.imread("imageio:astronaut.png")
    image = gfx.Image(
        gfx.Geometry(grid=gfx.Texture(im, dim=2)),
        gfx.ImageBasicMaterial(clim=(0, 255), pick_write=True),
    )
    scene.add(image)

    ruler = gfx.Ruler(ticks_at_end_points=True)
    ruler.local.z = 0.1  # move on top of the image
    scene.add(ruler)

    camera = gfx.OrthographicCamera(512, 512)
    camera.local.position = (256, 256, 0)
    camera.local.scale_y = -1


    @image.add_event_handler("click")
    def event_handler(event):
        pos = np.array([*event.pick_info["index"], 0])
        if event.button == 1:
            ruler.start_pos = pos
        elif event.button == 2:
            ruler.end_pos = pos
        renderer.request_draw()


    def animate():
        ruler.update(camera, canvas.get_logical_size())
        renderer.render(scene, camera)


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


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

   **Total running time of the script:** (0 minutes 0.534 seconds)


.. _sphx_glr_download__gallery_feature_demo_measure_distances_2d.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: measure_distances_2d.ipynb <measure_distances_2d.ipynb>`

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

      :download:`Download Python source code: measure_distances_2d.py <measure_distances_2d.py>`

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

      :download:`Download zipped: measure_distances_2d.zip <measure_distances_2d.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#measure_distances_2d.py"></iframe>