110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
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#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program 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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* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_INTERPOLATION_H
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#define BLT_INTERPOLATION_H
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#include "vectors.h"
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namespace blt
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{
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inline constexpr color4 linear_interpolate(const color4& in, const color4& desired, float factor)
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{
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auto diff = desired - in;
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return in + (diff * factor);
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}
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class easing_function
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{
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public:
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easing_function() = default;
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virtual color4 apply(const color4& start, const color4& end) = 0;
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void progress(float progress)
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{
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total_progress += progress;
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}
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void reset()
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{
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total_progress = 0;
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}
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protected:
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float x()
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{
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return total_progress;
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}
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private:
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float total_progress = 0;
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};
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class quad_easing : public easing_function
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{
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public:
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color4 apply(const color4& start, const color4& end) final
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{
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if (x() >= 1)
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return end;
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auto diff = end - start;
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return start + (diff * (x() * x()));
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}
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};
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class cubic_easing : public easing_function
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{
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public:
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color4 apply(const color4& start, const color4& end) final
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{
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if (x() >= 1)
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return end;
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auto diff = end - start;
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return start + (diff * (x() * x() * x()));
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}
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};
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class quart_easing : public easing_function
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{
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public:
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color4 apply(const color4& start, const color4& end) final
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{
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if (x() >= 1)
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return end;
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auto diff = end - start;
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return start + (diff * (x() * x() * x() * x()));
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}
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};
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class quint_easing : public easing_function
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{
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public:
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color4 apply(const color4& start, const color4& end) final
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{
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if (x() >= 1)
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return end;
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auto diff = end - start;
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return start + (diff * (x() * x() * x() * x() * x()));
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}
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};
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}
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#endif //BLT_INTERPOLATION_H
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