84 lines
2.3 KiB
C++
Executable file
84 lines
2.3 KiB
C++
Executable file
/*
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* Copyright (c) 2018 Samsung Electronics Co., Ltd. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef VINTERPOLATOR_H
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#define VINTERPOLATOR_H
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#include "vpoint.h"
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V_BEGIN_NAMESPACE
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class VInterpolator {
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public:
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VInterpolator()
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{ /* caller must call Init later */
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}
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VInterpolator(float aX1, float aY1, float aX2, float aY2)
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{
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init(aX1, aY1, aX2, aY2);
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}
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VInterpolator(VPointF pt1, VPointF pt2)
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{
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init(pt1.x(), pt1.y(), pt2.x(), pt2.y());
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}
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void init(float aX1, float aY1, float aX2, float aY2);
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float value(float aX) const;
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void GetSplineDerivativeValues(float aX, float& aDX, float& aDY) const;
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private:
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void CalcSampleValues();
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/**
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* Returns x(t) given t, x1, and x2, or y(t) given t, y1, and y2.
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*/
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static float CalcBezier(float aT, float aA1, float aA2);
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/**
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* Returns dx/dt given t, x1, and x2, or dy/dt given t, y1, and y2.
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*/
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static float GetSlope(float aT, float aA1, float aA2);
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float GetTForX(float aX) const;
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float NewtonRaphsonIterate(float aX, float aGuessT) const;
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float BinarySubdivide(float aX, float aA, float aB) const;
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static float A(float aA1, float aA2) { return 1.0 - 3.0 * aA2 + 3.0 * aA1; }
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static float B(float aA1, float aA2) { return 3.0 * aA2 - 6.0 * aA1; }
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static float C(float aA1) { return 3.0 * aA1; }
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float mX1;
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float mY1;
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float mX2;
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float mY2;
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enum { kSplineTableSize = 11 };
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float mSampleValues[kSplineTableSize];
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static const float kSampleStepSize;
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};
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V_END_NAMESPACE
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#endif // VINTERPOLATOR_H
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