forked from qt-creator/qt-creator
ec9d9586fc
Fixes qdoc warnings. Change-Id: I666e6db9ee3a3a5c83f093f2e48981701f137d5c Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io> Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
// Copyright (C) 2022 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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#include "mathutils.h"
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#include <QtMath>
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/*!
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\namespace Utils::MathUtils
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\inmodule QtCreator
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\brief Contains functions for interpolation.
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*/
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namespace Utils::MathUtils {
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/*!
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Linear interpolation:
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\list
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\li For \a x = \a x1 it returns \a y1.
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\li For \a x = \a x2 it returns \a y2.
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\endlist
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*/
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int interpolateLinear(int x, int x1, int x2, int y1, int y2)
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{
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if (x1 == x2)
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return y1; // or the middle point between y1 and y2?
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if (y1 == y2)
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return y1;
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if (x == x1)
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return y1;
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if (x == x2)
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return y2;
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const int numerator = (y2 - y1) * x + x2 * y1 - x1 * y2;
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const int denominator = x2 - x1;
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return qRound(double(numerator) / denominator);
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}
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/*!
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Tangential interpolation:
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\list
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\li For \a x = 0 it returns \a y1.
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\li For \a x = \a xHalfLife it returns 50 % of the distance between
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\a y1 and \a y2.
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\li For \a x = infinity it returns \a y2.
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\endlist
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*/
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int interpolateTangential(int x, int xHalfLife, int y1, int y2)
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{
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if (x == 0)
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return y1;
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if (y1 == y2)
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return y1;
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const double angle = atan2(double(x), double(xHalfLife));
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const double result = y1 + (y2 - y1) * angle * 2 / M_PI;
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return qRound(result);
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}
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/*!
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Exponential interpolation:
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\list
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\li For \a x = 0 it returns \a y1.
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\li For \a x = \a xHalfLife it returns 50 % of the distance between
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\a y1 and \a y2.
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\li For \a x = infinity it returns \a y2.
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\endlist
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*/
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int interpolateExponential(int x, int xHalfLife, int y1, int y2)
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{
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if (x == 0)
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return y1;
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if (y1 == y2)
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return y1;
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const double exponent = pow(0.5, double(x) / xHalfLife);
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const double result = y1 + (y2 - y1) * (1.0 - exponent);
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return qRound(result);
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}
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} // namespace Utils::MathUtils
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