51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
/* Copyright 2013-2019 Matt Tytel
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*
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* vital 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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* vital 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 vital. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "wavetable_keyframe.h"
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#include "utils.h"
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#include "wavetable_component.h"
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float WavetableKeyframe::linearTween(float point_from, float point_to, float t) {
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return vital::utils::interpolate(point_from, point_to, t);
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}
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float WavetableKeyframe::cubicTween(float point_prev, float point_from, float point_to, float point_next,
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float range_prev, float range, float range_next, float t) {
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float slope_from = 0.0f;
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float slope_to = 0.0f;
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if (range_prev > 0.0f)
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slope_from = (point_to - point_prev) / (1.0f + range_prev / range);
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if (range_next > 0.0f)
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slope_to = (point_next - point_from) / (1.0f + range_next / range);
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float delta = point_to - point_from;
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float movement = linearTween(point_from, point_to, t);
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float smooth = t * (1.0f - t) * ((1.0f - t) * (slope_from - delta) + t * (delta - slope_to));
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return movement + smooth;
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}
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int WavetableKeyframe::index() {
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return owner()->indexOf(this);
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}
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json WavetableKeyframe::stateToJson() {
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return { { "position", position_ } };
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}
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void WavetableKeyframe::jsonToState(json data) {
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position_ = data["position"];
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}
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