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

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

.. _sphx_glr_gallery_snake.py:


Snake game
----------

Simple snake game based on bitmap rendering. Work in progress.

.. GENERATED FROM PYTHON SOURCE LINES 7-72

.. code-block:: Python


    from collections import deque

    import numpy as np

    from rendercanvas.auto import RenderCanvas, loop


    canvas = RenderCanvas(
        title="Snake on $backend",
        present_method=None,
        size=(640, 480),
        update_mode="continuous",
    )

    context = canvas.get_bitmap_context()

    world = np.zeros((120, 160), np.uint8)
    pos = [100, 100]
    direction = [1, 0]
    q = deque()


    @canvas.add_event_handler("key_down")
    def on_key(event):
        key = event["key"]
        if key == "ArrowLeft":
            direction[0] = -1
            direction[1] = 0
        elif key == "ArrowRight":
            direction[0] = 1
            direction[1] = 0
        elif key == "ArrowUp":
            direction[0] = 0
            direction[1] = -1
        elif key == "ArrowDown":
            direction[0] = 0
            direction[1] = 1


    @canvas.request_draw
    def animate():
        pos[0] += direction[0]
        pos[1] += direction[1]

        if pos[0] < 0:
            pos[0] = world.shape[1] - 1
        elif pos[0] >= world.shape[1]:
            pos[0] = 0
        if pos[1] < 0:
            pos[1] = world.shape[0] - 1
        elif pos[1] >= world.shape[0]:
            pos[1] = 0

        q.append(tuple(pos))
        world[pos[1], pos[0]] = 255

        while len(q) > 20:
            old_pos = q.popleft()
            world[old_pos[1], old_pos[0]] = 0

        context.set_bitmap(world)


    loop.run()


.. _sphx_glr_download_gallery_snake.py:

.. only:: html

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

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

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

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

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

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

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


.. only:: html

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

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

.. only:: html

    Interactive example
    ===================

    This uses Pyodide. If this does not work, your browser may not have sufficient support for wasm/pyodide/wgpu (check your browser dev console).

    .. raw:: html

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