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/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <engine/animation/locomotion/step.hpp>
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#include <engine/math/fract.hpp>
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#include <cmath>
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float step::phase(float t) const noexcept
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{
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// Make phase relative to step stance
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t = math::fract(1.0f + t + delay - duty_factor);
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if (t < duty_factor)
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{
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// Stance phase, on `[-1, 0)`
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return (t - duty_factor) / duty_factor;
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}
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else
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{
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// Swing phase, on `[0, 1]`
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return (t - duty_factor) / (1.0f - duty_factor);
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}
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}
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