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/*
* Copyright 2022 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef INK_STROKE_MODELER_INTERNAL_WOBBLE_SMOOTHER_H_
#define INK_STROKE_MODELER_INTERNAL_WOBBLE_SMOOTHER_H_
#include <deque>
#include "ink_stroke_modeler/params.h"
#include "ink_stroke_modeler/types.h"
namespace ink {
namespace stroke_model {
// This class smooths "wobble" in input positions from high-frequency noise. It
// does so by maintaining a moving average of the positions, and interpolating
// between the given input and the moving average based on how quickly it's
// moving. When moving at a speed above the ceiling in the WobbleSmootherParams,
// the result will be the unmodified input; when moving at a speed below the
// floor, the result will be the moving average.
class WobbleSmoother {
public:
void Reset(const WobbleSmootherParams ¶ms, Vec2 position, Time time);
// Updates the average position and speed, and returns the smoothed position.
Vec2 Update(Vec2 position, Time time);
private:
struct Sample {
Vec2 position{0};
float speed{0};
Time time{0};
};
std::deque<Sample> samples_;
Vec2 position_sum_{0};
float speed_sum_{0};
WobbleSmootherParams params_;
};
} // namespace stroke_model
} // namespace ink
#endif // INK_STROKE_MODELER_INTERNAL_WOBBLE_SMOOTHER_H_
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