Coverage for /usr/lib/python3/dist-packages/colorzero/easings.py: 30%
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« prev ^ index » next coverage.py v7.2.7, created at 2024-02-10 12:38 +0000
1# vim: set et sw=4 sts=4 fileencoding=utf-8:
2#
3# The colorzero color library
4# Copyright (c) 2016-2018 Dave Jones <dave@waveform.org.uk>
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions are met:
8#
9# * Redistributions of source code must retain the above copyright
10# notice, this list of conditions and the following disclaimer.
11# * Redistributions in binary form must reproduce the above copyright
12# notice, this list of conditions and the following disclaimer in the
13# documentation and/or other materials provided with the distribution.
14# * Neither the name of the copyright holder nor the
15# names of its contributors may be used to endorse or promote products
16# derived from this software without specific prior written permission.
17#
18# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28# POSSIBILITY OF SUCH DAMAGE.
30"Defines various easing functions for :meth:`Color.gradient`."
32from __future__ import (
33 unicode_literals,
34 print_function,
35 division,
36 absolute_import,
37)
39from collections import namedtuple
42def linear(steps):
43 "Linear easing function; yields *steps* values between 0.0 and 1.0"
44 for t in range(steps):
45 yield t / (steps - 1)
48def ease_in(steps):
49 "Quadratic ease-in function; yields *steps* values between 0.0 and 1.0"
50 for t in linear(steps):
51 yield t ** 2
54def ease_out(steps):
55 "Quadratic ease-out function; yields *steps* values between 0.0 and 1.0"
56 for t in linear(steps):
57 yield t * (2 - t)
60def ease_in_out(steps):
61 "Quadratic ease-in-out function; yields *steps* values between 0.0 and 1.0"
62 for t in linear(steps):
63 yield 2 * t * t if t < 0.5 else (4 - 2 * t) * t - 1