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

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

.. _sphx_glr__gallery_feature_demo_panzoom_camera.py:


Panzoom Camera
==============

Example showing orbit camera controller.

Press 's' to save the state, and
press 'l' to load the last saved state.

.. GENERATED FROM PYTHON SOURCE LINES 10-74



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_panzoom_camera_001.webp
   :alt: panzoom camera
   :srcset: /_gallery/feature_demo/images/sphx_glr_panzoom_camera_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



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


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

    axes = gfx.AxesHelper(size=250)
    scene.add(axes)

    dark_gray = np.array((169, 167, 168, 255)) / 255
    light_gray = np.array((100, 100, 100, 255)) / 255
    background = gfx.Background.from_color(light_gray, dark_gray)
    scene.add(background)

    im = iio.imread("imageio:astronaut.png")
    tex = gfx.Texture(im, dim=2)
    geometry = gfx.plane_geometry(512, 512)
    material = gfx.MeshBasicMaterial(map=tex)
    plane = gfx.Mesh(geometry, material)
    scene.add(plane)

    camera = gfx.OrthographicCamera(512, 512)
    camera.show_object(scene)
    controller = gfx.PanZoomController(camera, register_events=renderer)


    # initial camera state
    camera_state = camera.get_state()


    def on_key_down(event):
        if event.key not in ["s", "l", "r"]:
            return

        global camera_state

        # without disabling the controller any in-progress action
        # during this function call will overwrite the camera state
        controller.enabled = False

        if event.key == "s":
            camera_state = camera.get_state()
        elif event.key == "l":
            camera.set_state(camera_state)
        elif event.key == "r":
            camera.show_object(scene)

        controller.enabled = True

        canvas.request_draw()  # not required if you are continuously rendering


    renderer.add_event_handler(on_key_down, "key_down")


    if __name__ == "__main__":
        canvas.request_draw(lambda: renderer.render(scene, camera))
        loop.run()


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

   **Total running time of the script:** (0 minutes 0.292 seconds)


.. _sphx_glr_download__gallery_feature_demo_panzoom_camera.py:

.. only:: html

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

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

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

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

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

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

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