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

.. only:: html

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

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

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

.. _sphx_glr_gallery_gloo_outlined_cube.py:


Show a rotating cube with an outline
====================================

.. GENERATED FROM PYTHON SOURCE LINES 13-119







.. code-block:: Python


    import numpy as np

    from vispy import gloo, app
    from vispy.gloo import Program, VertexBuffer, IndexBuffer
    from vispy.util.transforms import perspective, translate, rotate
    from vispy.geometry import create_cube

    vertex = """
    uniform mat4 u_model;
    uniform mat4 u_view;
    uniform mat4 u_projection;
    uniform vec4 u_color;

    attribute vec3 position;
    attribute vec2 texcoord;
    attribute vec3 normal;
    attribute vec4 color;

    varying vec4 v_color;
    void main()
    {
        v_color = u_color * color;
        gl_Position = u_projection * u_view * u_model * vec4(position,1.0);
    }
    """

    fragment = """
    varying vec4 v_color;
    void main()
    {
        gl_FragColor = v_color;
    }
    """


    class Canvas(app.Canvas):
        def __init__(self):
            app.Canvas.__init__(self, size=(512, 512), title='Rotating cube',
                                keys='interactive')
            self.timer = app.Timer('auto', self.on_timer)

            # Build cube data
            V, I, outline = create_cube()
            vertices = VertexBuffer(V)
            self.faces = IndexBuffer(I)
            self.outline = IndexBuffer(outline)

            # Build program
            # --------------------------------------
            self.program = Program(vertex, fragment)
            self.program.bind(vertices)

            # Build view, model, projection & normal
            # --------------------------------------
            view = translate((0, 0, -5))
            model = np.eye(4, dtype=np.float32)

            self.program['u_model'] = model
            self.program['u_view'] = view
            self.phi, self.theta = 0, 0

            self.activate_zoom()

            # OpenGL initialization
            # --------------------------------------
            gloo.set_state(clear_color=(0.30, 0.30, 0.35, 1.00), depth_test=True,
                           polygon_offset=(1, 1), line_width=0.75,
                           blend_func=('src_alpha', 'one_minus_src_alpha'))
            self.timer.start()

            self.show()

        def on_draw(self, event):
            gloo.clear(color=True, depth=True)

            # Filled cube
            gloo.set_state(blend=False, depth_test=True, polygon_offset_fill=True)
            self.program['u_color'] = 1, 1, 1, 1
            self.program.draw('triangles', self.faces)

            # Outlined cube
            gloo.set_state(blend=True, depth_mask=False, polygon_offset_fill=False)
            self.program['u_color'] = 0, 0, 0, 1
            self.program.draw('lines', self.outline)
            gloo.set_state(depth_mask=True)

        def on_resize(self, event):
            self.activate_zoom()

        def activate_zoom(self):
            gloo.set_viewport(0, 0, *self.physical_size)
            projection = perspective(45.0, self.size[0] / float(self.size[1]),
                                     2.0, 10.0)
            self.program['u_projection'] = projection

        def on_timer(self, event):
            self.theta += .5
            self.phi += .5
            self.program['u_model'] = np.dot(rotate(self.theta, (0, 0, 1)),
                                             rotate(self.phi, (0, 1, 0)))
            self.update()

    if __name__ == '__main__':
        c = Canvas()
        app.run()


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

   **Total running time of the script:** (0 minutes 0.156 seconds)


.. _sphx_glr_download_gallery_gloo_outlined_cube.py:

.. only:: html

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

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

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

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

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

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

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


.. only:: html

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

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