Adding a new gallery example

This example shows how to add a new example to the PyAnsys Sphinx-Gallery. You can use this example as a template for adding your examples.

Each example should have a reference tag/key in the form:

.. _<example-name>_example:.

The .. _ is necessary. Everything that follows is your reference tag, which can potentially be used within a docstring. All references should be in snake case.

The first section, which is text, provides a brief overview of what the example is. When using this example as a template, you would change the title to an appropriate one for your example.

Add new examples as Python scripts like this:

examples/<index>-<directory-name>/<some-example>.py

Note

Avoid creating directories unless absolutely necessary. If you must create a directory, make sure to add a README.txt file containing a reference, a title, and a one-sentence description of the directory. Otherwise, Sphinx ignores the new directory.

Example file names should use snake case and be hyphen-separated:

some-example.py

After this text section is the first code block. This is where you typically set up your imports.

import pyvista as pv

Section title

Code blocks can be broken up with text sections, which are interpreted as ReStructuredText.

The text sections are also translated into a markdown cell in the generated Jupyter notebook or in the HTML documentation.

Text sections can contain any information that you may have regarding the example, such as step-by-step comments and notes regarding motivations.

As in Jupyter notebooks, if a statement is unassigned at the end of a code block, output is generated and printed to the screen according to its __repr__ method. Otherwise, you can use the print() function to output text.

# Create a dataset and exercise its ``__repr__`` method

dataset = pv.Sphere()
dataset

Header	Data Arrays
PolyData Information N Cells 1680 N Points 842 N Strips 0 X Bounds -4.993e-01, 4.993e-01 Y Bounds -4.965e-01, 4.965e-01 Z Bounds -5.000e-01, 5.000e-01 N Arrays 1	Name Field Type N Comp Min Max Normals Points float32 3 -1.000e+00 1.000e+00

Plots and images

If you use anything that outputs an image (for example, the pyvista.Plotter.show() function), the resulting image is rendered in the HTML documentation.

Note

Unless sphinx_gallery_thumbnail_number = <int> is included at the top of the example script, the first figure (this one) is used for the gallery thumbnail image.

Also note that this image number uses one-based indexing.

dataset.plot(text="Example Figure")

Caveat - plotter must be within one cell

It’s not possible to have a single pyvista.Plotter object across multiple cells because these are closed out automatically at the end of a cell.

This code exercise the pyvista.Actor repr to demonstrate why you might want to instantiate a plotter without showing it in the same cell:

pl = pv.Plotter()
actor = pl.add_mesh(dataset)
actor

Actor (0x7fa2008aa860)
  Center:                     (0.0, 0.0, 0.0)
  Pickable:                   True
  Position:                   (0.0, 0.0, 0.0)
  Scale:                      (1.0, 1.0, 1.0)
  Visible:                    True
  X Bounds                    -4.993E-01, 4.993E-01
  Y Bounds                    -4.965E-01, 4.965E-01
  Z Bounds                    -5.000E-01, 5.000E-01
  User matrix:                Identity
  Has mapper:                 True

Property (0x7fa200a9f7c0)
  Ambient:                     0.0
  Ambient color:               Color(name='lightblue', hex='#add8e6ff', opacity=255)
  Anisotropy:                  0.0
  Anisotropy rotation:         0.0
  Backface culling:            0
  Base ior:                    1.5
  Class name:                  "vtkOpenGLProperty"
  Coat color:                  (1.0, 1.0, 1.0)
  Coat ior:                    2.0
  Coat normal scale:           1.0
  Coat roughness:              0.0
  Coat strength:               0.0
  Color:                       Color(name='lightblue', hex='#add8e6ff', opacity=255)
  Culling:                     "none"
  Debug:                       False
  Diffuse:                     1.0
  Diffuse color:               Color(name='lightblue', hex='#add8e6ff', opacity=255)
  Edge color:                  Color(name='black', hex='#000000ff', opacity=255)
  Edge opacity:                1.0
  Edge tint:                   (1.0, 1.0, 1.0)
  Edge visibility:             0
  Emissive factor:             (1.0, 1.0, 1.0)
  Frontface culling:           0
  Global warning display:      1
  Information:                 vtkInformation (0x55c72c80dcc0)
  Debug: Off
  Modified Time: 28991
  Reference Count: 2
  Registered Events: (none)


  Interpolation:               InterpolationType.FLAT
  Is in memkind:               False
  Lighting:                    True
  Line stipple pattern:        65535
  Line stipple repeat factor:  1
  Line width:                  1.0
  M time:                      28996
  Material name:               None
  Metallic:                    0.0
  Normal scale:                1.0
  Number of textures:          0
  Object description:          "vtkOpenGLProperty (0x55c72d8e5e30)"
  Object name:                 ""
  Occlusion strength:          1.0
  Opacity:                     1.0
  Point size:                  5.0
  Reference count:             2
  Render lines as tubes:       False
  Render points as spheres:    False
  Representation:              2
  Roughness:                   0.5
  Selection color:             (1.0, 0.0, 0.0, 1.0)
  Selection line width:        2.0
  Selection point size:        2.0
  Shading:                     0
  Show edges:                  False
  Show textures on backface:   True
  Specular:                    0.0
  Specular color:              Color(name='lightblue', hex='#add8e6ff', opacity=255)
  Specular power:              100.0
  Style:                       "Surface"
  Using memkind:               False
  Vertex color:                (0.5, 1.0, 0.5)
  Vertex visibility:           0

DataSetMapper (0x7fa200a9f7c0)
  Scalar visibility:           False
  Scalar range:                (0.0, 1.0)
  Interpolate before mapping:  True
  Scalar map mode:             default
  Color mode:                  direct

Attached dataset:
PolyData (0x7fa20aa39240)
  N Cells:    1680
  N Points:   842
  N Strips:   0
  X Bounds:   -4.993e-01, 4.993e-01
  Y Bounds:   -4.965e-01, 4.965e-01
  Z Bounds:   -5.000e-01, 5.000e-01
  N Arrays:   1

This cell cannot run the plotter

Because the plotter is already closed by Sphinx-Gallery, the following code would raise an error:

>>> pl.show()

# You can, however, close out the plotter or access other attributes.

pl.close()

Create a pull request

Once your example is complete and you’ve verified that it builds locally, you can create a pull request.

Branches containing examples should be prefixed with docs/ as per Branch-naming conventions.

Note

You only need to create the Python source example (PY file). Sphinx-Gallery automatically generates the Jupyter notebook and the RST file for generating the HTML documentation page.