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

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

.. _sphx_glr__gallery_feature_demo_line_basic.py:


Line Drawing
============

Drawing a line with a shape that makes it interesting for demonstrating/testing
various aspects of line rendering. Use the middle-mouse button to set the
position of the last point. Use '1' and '2' to toggle between normal and dashed
mode.

.. GENERATED FROM PYTHON SOURCE LINES 10-117



.. image-sg:: /_gallery/feature_demo/images/sphx_glr_line_basic_001.webp
   :alt: line basic
   :srcset: /_gallery/feature_demo/images/sphx_glr_line_basic_001.webp
   :class: sphx-glr-single-img





.. code-block:: Python



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

    canvas = RenderCanvas(size=(1000, 800))
    renderer = gfx.WgpuRenderer(canvas)

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

    positions = [[200 + np.sin(i) * i * 6, 200 + np.cos(i) * i * 6, 0] for i in range(20)]
    positions += [[np.nan, np.nan, np.nan]]
    positions += [[400 - np.sin(i) * i * 6, 200 + np.cos(i) * i * 6, 0] for i in range(20)]
    positions += [[np.nan, np.nan, np.nan]]
    positions += [
        [100, 450, 0],
        [102, 450, 0],
        [104, 450, 0],
        [106, 450, 0],
        [200, 450, 0],
        [200, 445, 0],
        [400, 440, 0],
        [300, 400, 0],
        [300, 390, 0],
        [400, 370, 0],
        [350, 350, 0],
    ]

    # Spiral away in z (to make the depth buffer less boring)
    for i in range(len(positions)):
        positions[i][2] = i

    line = gfx.Line(
        gfx.Geometry(positions=positions),
        gfx.LineMaterial(
            thickness=22.0, color=(0.8, 0.7, 0.0), alpha_mode="blend", aa=False
        ),
    )
    scene.add(line)

    camera = gfx.OrthographicCamera(600, 500)
    camera.local.position = (300, 250, 0)

    controller = gfx.PanZoomController(camera, register_events=renderer)

    alpha = 0
    d_alpha = 0.05


    @renderer.add_event_handler("key_down")
    def change_material(event):
        if event.key == "1":
            line.material = gfx.LineMaterial(
                thickness=22.0, color=(0.8, 0.7, 0.0), aa=False
            )
        elif event.key == "2":
            line.material = gfx.LineMaterial(
                thickness=22.0, color=(0.8, 0.7, 0.0), opacity=0.5, aa=True
            )

        elif event.key == "3":
            line.material = gfx.LineMaterial(
                thickness=22.0,
                color=(0.8, 0.7, 0.0),
                dash_pattern=(4, 2, 3, 2, 2, 2, 1, 2, 0, 2),
                thickness_space="screen",
                opacity=0.5,
                aa=True,
            )
        elif event.key == "4":
            line.material = gfx.LineDebugMaterial(thickness=22.0, color=(0.8, 0.7, 0.0))
        elif event.key == "o":
            line.material.dash_offset += 4
        elif event.key == "a":
            line.material.aa = not line.material.aa
        elif event.key == "p":
            renderer.ppaa = "ddaa" if renderer.ppaa == "none" else "none"
        elif event.key == "r":
            renderer.pixel_ratio = 2 if renderer.pixel_ratio == 1 else 1
        renderer.request_draw()


    @renderer.add_event_handler("pointer_move", "pointer_down")
    def set_last_node(event):
        if event.modifiers:
            return
        if 3 in event.buttons or event.button == 3:
            w, h = canvas.get_logical_size()
            ndcx, ndcy = 2 * event.x / w - 1, 1 - 2 * event.y / h
            pos = la.vec_transform((ndcx, ndcy, 0), np.linalg.pinv(camera.camera_matrix))
            line.geometry.positions.data[-1, :2] = pos[0], pos[1]
            line.geometry.positions.update_range(len(positions) - 1, 1)
            renderer.request_draw()


    def animate():
        line.material.dash_offset += 0.1
        renderer.render(scene, camera)
        canvas.request_draw()


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


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

   **Total running time of the script:** (0 minutes 0.416 seconds)


.. _sphx_glr_download__gallery_feature_demo_line_basic.py:

.. only:: html

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

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

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

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

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

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

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