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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef VINTERPOLATOR_H
#define VINTERPOLATOR_H
#include "vector_vpoint.h"
V_BEGIN_NAMESPACE
class VInterpolator {
public:
VInterpolator()
{ /* caller must call Init later */
}
VInterpolator(float aX1, float aY1, float aX2, float aY2)
{
init(aX1, aY1, aX2, aY2);
}
VInterpolator(VPointF pt1, VPointF pt2)
{
init(pt1.x(), pt1.y(), pt2.x(), pt2.y());
}
void init(float aX1, float aY1, float aX2, float aY2);
float value(float aX) const;
void GetSplineDerivativeValues(float aX, float& aDX, float& aDY) const;
private:
void CalcSampleValues();
/**
* Returns x(t) given t, x1, and x2, or y(t) given t, y1, and y2.
*/
static float CalcBezier(float aT, float aA1, float aA2);
/**
* Returns dx/dt given t, x1, and x2, or dy/dt given t, y1, and y2.
*/
static float GetSlope(float aT, float aA1, float aA2);
float GetTForX(float aX) const;
float NewtonRaphsonIterate(float aX, float aGuessT) const;
float BinarySubdivide(float aX, float aA, float aB) const;
static float A(float aA1, float aA2) { return 1.0f - 3.0f * aA2 + 3.0f * aA1; }
static float B(float aA1, float aA2) { return 3.0f * aA2 - 6.0f * aA1; }
static float C(float aA1) { return 3.0f * aA1; }
float mX1;
float mY1;
float mX2;
float mY2;
enum { kSplineTableSize = 11 };
float mSampleValues[kSplineTableSize];
static const float kSampleStepSize;
};
V_END_NAMESPACE
#endif // VINTERPOLATOR_H
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