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/*
* Copyright 2012, The Android Open Source Project
*
* 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 LINEAR_REGRESSION_H_
#define LINEAR_REGRESSION_H_
#include <sys/types.h>
#include <media/stagefright/foundation/ABase.h>
namespace android {
// Helper class to fit a line to a set of points minimizing the sum of
// squared (orthogonal) distances from line to individual points.
struct LinearRegression {
LinearRegression(size_t historySize);
~LinearRegression();
void addPoint(float x, float y);
bool approxLine(float *n1, float *n2, float *b) const;
private:
struct Point {
float mX, mY;
};
size_t mHistorySize;
size_t mCount;
Point *mHistory;
float mSumX, mSumY;
DISALLOW_EVIL_CONSTRUCTORS(LinearRegression);
};
} // namespace android
#endif // LINEAR_REGRESSION_H_
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