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

.. only:: html

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

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

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

.. _sphx_glr_gallery_scene_isocurve.py:


Display an Isocurve
===================

Simple use of SceneCanvas to display an Isocurve visual.

.. GENERATED FROM PYTHON SOURCE LINES 13-53



.. image-sg:: /gallery/scene/images/sphx_glr_isocurve_001.png
   :alt: isocurve
   :srcset: /gallery/scene/images/sphx_glr_isocurve_001.png
   :class: sphx-glr-single-img





.. code-block:: Python

    import sys
    from vispy import app, scene, visuals
    from vispy.util.filter import gaussian_filter
    import numpy as np

    canvas = scene.SceneCanvas(keys='interactive', title='Isocurve(s) overlayed '
                               'over Random Image Example')
    canvas.size = 800, 600
    canvas.show()

    # Set up a viewbox to display the image with interactive pan/zoom
    view = canvas.central_widget.add_view()

    # Create the image
    img_data = np.empty((200, 100, 3), dtype=np.ubyte)
    noise = np.random.normal(size=(200, 100), loc=50, scale=150)
    noise = gaussian_filter(noise, (4, 4, 0))
    img_data[:] = noise[..., np.newaxis]
    image = scene.visuals.Image(img_data, parent=view.scene)
    # move image behind curves
    image.transform = visuals.transforms.STTransform(translate=(0, 0, 0.5))

    # level and color setup
    levels = [40, 50, 60]
    color_lev = [(1, 0, 0, 1),
                 (1, 0.5, 0, 1),
                 (1, 1, 0, 1)]

    # Create isocurve, make a child of the image to ensure the two are always
    # aligned.
    curve = scene.visuals.Isocurve(noise, levels=levels, color_lev=color_lev,
                                   parent=view.scene)

    # Set 2D camera
    view.camera = scene.PanZoomCamera(aspect=1)
    # the camera will scale to the contents in the scene
    view.camera.set_range()

    if __name__ == '__main__' and sys.flags.interactive == 0:
        app.run()


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

   **Total running time of the script:** (0 minutes 0.747 seconds)


.. _sphx_glr_download_gallery_scene_isocurve.py:

.. only:: html

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

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

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

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

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

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

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


.. only:: html

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

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