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https://github.com/EsotericSoftware/spine-runtimes.git
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48 lines
2.0 KiB
Lua
48 lines
2.0 KiB
Lua
-------------------------------------------------------------------------------
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-- Spine Runtimes License Agreement
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-- Last updated May 1, 2019. Replaces all prior versions.
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--
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-- Copyright (c) 2013-2019, Esoteric Software LLC
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--
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-- Integration of the Spine Runtimes into software or otherwise creating
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-- derivative works of the Spine Runtimes is permitted under the terms and
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-- conditions of Section 2 of the Spine Editor License Agreement:
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-- http://esotericsoftware.com/spine-editor-license
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--
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-- Otherwise, it is permitted to integrate the Spine Runtimes into software
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-- or otherwise create derivative works of the Spine Runtimes (collectively,
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-- "Products"), provided that each user of the Products must obtain their own
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-- Spine Editor license and redistribution of the Products in any form must
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-- include this license and copyright notice.
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--
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-- THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY EXPRESS
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-- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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-- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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-- NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY DIRECT, INDIRECT,
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-- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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-- BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS
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-- INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY
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-- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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-- EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-------------------------------------------------------------------------------
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local interpolation = {}
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local math_pow = math.pow
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function interpolation.apply (func, start, _end, a)
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return start + (_end - start) * func(a)
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end
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function interpolation.pow2(a)
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if (a <= 0.5) then return math_pow(a * 2, 2) / 2 end
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return math_pow((a - 1) * 2, 2) / -2 + 1
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end
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function interpolation.pow2out(a)
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return math_pow(a - 1, 2) * -1 + 1
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end
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return interpolation
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