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# Nongui example

This script demonstrates how one can use the Mayavi application framework without displaying Mayavi’s UI.

Note: look at the end of this file to see how the non gui plugin is chosen instead of the default gui mayavi plugin.

This should be run as:

    $ python nongui.py

Or:

    $ mayavi2 script.py

Python source code: `nongui.py`

    # Author: Prabhu Ramachandran <prabhu_r@users.sf.net>
    # Copyright (c) 2005, Enthought, Inc.
    # License: BSD Style.

    # Standard library imports
    from os.path import join, abspath

    # Enthought library imports
    from mayavi.scripts.util import get_data_dir
    from mayavi.plugins.app import Mayavi, get_non_gui_plugins

    class MyApp(Mayavi):
        def run(self):
            """This is executed once the application GUI has started.
            *Make sure all other MayaVi specific imports are made here!*
            """

            # Various imports to do different things.
            from mayavi.sources.vtk_file_reader import VTKFileReader
            from mayavi.modules.outline import Outline
            from mayavi.modules.axes import Axes
            from mayavi.modules.grid_plane import GridPlane
            from mayavi.modules.image_plane_widget import ImagePlaneWidget
            from mayavi.modules.text import Text
            from mayavi.modules.contour_grid_plane import ContourGridPlane
            from mayavi.modules.iso_surface import IsoSurface

            script = self.script

            # Create a new scene.
            script.new_scene()

            # Read a VTK (old style) data file.
            r = VTKFileReader()
            r.initialize(join(get_data_dir(abspath(__file__)),
                              'heart.vtk'))
            script.add_source(r)

            # Put up some text.
            t = Text(text='MayaVi rules!', x_position=0.2, y_position=0.9, width=0.8)
            t.property.color = 1, 1, 0  # Bright yellow, yeah!
            script.add_module(t)

            # Create an outline for the data.
            o = Outline()
            script.add_module(o)

            # Create an axes for the data.
            a = Axes()
            script.add_module(a)

            # Create three simple grid plane modules.
            # First normal to 'x' axis.
            gp = GridPlane()
            script.add_module(gp)
            # Second normal to 'y' axis.
            gp = GridPlane()
            gp.grid_plane.axis = 'y'
            script.add_module(gp)
            # Third normal to 'z' axis.
            gp = GridPlane()
            script.add_module(gp)
            gp.grid_plane.axis = 'z'

            # Create one ImagePlaneWidget.
            ipw = ImagePlaneWidget()
            script.add_module(ipw)
            # Set the position to the middle of the data.
            ipw.ipw.slice_position = 16

            # Create one ContourGridPlane normal to the 'x' axis.
            cgp = ContourGridPlane()
            script.add_module(cgp)
            # Set the position to the middle of the data.
            cgp.grid_plane.axis = 'y'
            cgp.grid_plane.position = 15

            # An isosurface module.
            iso = IsoSurface(compute_normals=True)
            script.add_module(iso)
            iso.contour.contours = [200.0]

            # Set the view.
            s = script.engine.current_scene
            cam = s.scene.camera
            cam.azimuth(45)
            cam.elevation(15)
            s.render()

    if __name__ == '__main__':
        m = MyApp()
        # Get the default non GUI plugins.
        plugins = get_non_gui_plugins()
        # Start the app with these plugins.
        m.main(plugins=plugins)

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