gog — a grammar of graphics
Copyright 2026 psychometrician

Licensed under the Apache License, Version 2.0. See LICENSE.

--------------------------------------------------------------------------------
Third-party material included in this work
--------------------------------------------------------------------------------

ColorBrewer color schemes
-------------------------

`gog-core/src/render/palette.rs` includes one ColorBrewer color scheme, shipped
as the named palette `soft` (ColorBrewer's Set2).

    Copyright (c) 2002 Cynthia Brewer, Mark Harrower,
    and The Pennsylvania State University.

    Licensed under the Apache License, Version 2.0 (the "License"); you may not
    use this file except in compliance with the License. You may obtain a copy
    of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    License for the specific language governing permissions and limitations
    under the License.

See https://colorbrewer2.org/. The color values are used unchanged; nothing
else from ColorBrewer is included.


Matplotlib colormaps
--------------------

The named ramps `viridis`, `magma`, `inferno` and `plasma` are sampled from the
colormaps created for matplotlib by Nathaniel J. Smith, Stefan van der Walt and
(for `viridis`) Eric Firing, released by their authors into the public domain
under CC0. `cividis` is from Nunez, Anderton and Renslow (2018), "Optimizing
colormaps with consideration for color vision deficiency to enable accurate
interpretation of scientific data", PLOS ONE 13(7), also released CC0.

No attribution is required for these; it is recorded because using someone's
work without saying so is a discourtesy the license happens not to forbid.


Programming language logos in README.md
--------------------------------------

Recorded in `images/NOTICE`, beside the files, because no package ships them:
they are shown in README.md only. Every mark named there remains the property of
its owner, and one of them is share-alike licensed, which is why this file is not
the place for it. A copy of this NOTICE travels inside each packaged binding, and
none of those packages contains an image.


--------------------------------------------------------------------------------
Not third-party, and recorded so the question is not re-opened
--------------------------------------------------------------------------------

The default categorical palette (`gog`) and the default ramp (`blue`) are this
project's own. `okabe` reproduces the colorblind-safe qualitative set published
by Masataka Okabe and Kei Ito (2008), which its authors placed in the public
domain for free use. The diverging ramps `blue_red` and `brown_teal`, and the
`gray` ramp, were derived here against this project's own panel color rather
than adapted from an existing scheme.
