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

.. only:: html

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

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

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

.. _sphx_glr__gallery_selection_tools_unit_circle.py:


Unit circle
===========

Example with linear selectors on a sine and cosine function that demonstrates the unit circle.

This shows how fastplotlib supports bidirectional events, drag the linear selector on the sine
or cosine function and they will both move together.

Click on the sine or cosine function to set the colormap transform to illustrate the sine or
cosine function output values on the unit circle.

.. GENERATED FROM PYTHON SOURCE LINES 13-114



.. image-sg:: /_gallery/selection_tools/images/sphx_glr_unit_circle_001.webp
   :alt: unit circle
   :srcset: /_gallery/selection_tools/images/sphx_glr_unit_circle_001.webp
   :class: sphx-glr-single-img


.. rst-class:: sphx-glr-script-out

 .. code-block:: none

    /home/runner/work/fastplotlib/fastplotlib/fastplotlib/graphics/_features/_base.py:18: UserWarning: casting float64 array to float32
      warn(f"casting {array.dtype} array to float32")







|

.. code-block:: Python


    # test_example = false


    import numpy as np
    import fastplotlib as fpl


    # helper function to make a cirlce
    def make_circle(center, radius: float, n_points: int) -> np.ndarray:
        theta = np.linspace(0, 2 * np.pi, n_points)
        xs = radius * np.cos(theta)
        ys = radius * np.sin(theta)

        return np.column_stack([xs, ys]) + center


    # create a figure with 3 subplots
    figure = fpl.Figure((3, 1), names=["unit circle", "sin(x)", "cos(x)"], size=(700, 1024))

    # set the axes to intersect at (0, 0, 0) to better illustrate the unit circle
    for subplot in figure:
        subplot.axes.intersection = (0, 0, 0)

    figure["sin(x)"].camera.maintain_aspect = False
    figure["cos(x)"].camera.maintain_aspect = False

    # create sine and cosine data
    xs = np.linspace(0, 2 * np.pi, 360)
    sine = np.sin(xs)
    cosine = np.cos(xs)

    # circle data
    circle_data = make_circle(center=(0, 0), radius=1, n_points=360)

    # make the circle line graphic, set the cmap transform using the sine function
    circle_graphic = figure["unit circle"].add_line(
        circle_data, thickness=4, cmap="bwr", cmap_transform=sine
    )

    # line to show the circle radius
    # use it to indicate the current position of the sine and cosine selctors (below)
    radius_data = np.array([[0, 0, 0], [*circle_data[0], 0]])
    circle_radius = figure["unit circle"].add_line(
        radius_data, thickness=6, colors="magenta"
    )

    # sine line graphic, cmap transform set from the sine function
    sine_graphic = figure["sin(x)"].add_line(
        sine, thickness=10, cmap="bwr", cmap_transform=sine
    )

    # cosine line graphic, cmap transform set from the sine function
    # illustrates the sine function values on the cosine graphic
    cosine_graphic = figure["cos(x)"].add_line(
        cosine, thickness=10, cmap="bwr", cmap_transform=sine
    )

    # add linear selectors to the sine and cosine line graphics
    sine_selector = sine_graphic.add_linear_selector()
    cosine_selector = cosine_graphic.add_linear_selector()

    def set_circle_cmap(ev):
        # sets the cmap transforms

        cmap_transform = ev.graphic.data[:, 1]  # y-val data of the sine or cosine graphic
        for g in [sine_graphic, cosine_graphic]:
            g.cmap.transform = cmap_transform

        # set circle cmap transform
        circle_graphic.cmap.transform = cmap_transform

    # when the sine or cosine graphic is clicked, the cmap_transform
    # of the sine, cosine and circle line graphics are all set from
    # the y-values of the clicked line
    sine_graphic.add_event_handler(set_circle_cmap, "click")
    cosine_graphic.add_event_handler(set_circle_cmap, "click")


    def set_x_val(ev):
        # used to sync the two selectors
        value = ev.info["value"]
        index = ev.get_selected_index()

        sine_selector.selection = value
        cosine_selector.selection = value

        circle_radius.data[1, :-1] = circle_data[index]

    # add same event handler to both graphics
    sine_selector.add_event_handler(set_x_val, "selection")
    cosine_selector.add_event_handler(set_x_val, "selection")

    figure.show()


    # NOTE: `if __name__ == "__main__"` is NOT how to use fastplotlib interactively
    # please see our docs for using fastplotlib interactively in ipython and jupyter
    if __name__ == "__main__":
        print(__doc__)
        fpl.loop.run()


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

   **Total running time of the script:** (0 minutes 0.933 seconds)


.. _sphx_glr_download__gallery_selection_tools_unit_circle.py:

.. only:: html

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

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

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

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

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

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

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


.. only:: html

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

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