vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/* Copyright (C) 2019 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include <cmath>
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#include "graphics/SmoothedValue.h"
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CSmoothedValue::CSmoothedValue(float value, float smoothness, float minDelta)
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: m_Target(value),
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m_Current(value),
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m_Smoothness(smoothness),
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m_MinDelta(minDelta)
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{
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}
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float CSmoothedValue::Update(float time)
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{
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if (fabs(m_Target - m_Current) < m_MinDelta)
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return 0.0f;
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double p = pow(static_cast<double>(m_Smoothness), 10.0 * static_cast<double>(time));
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// (add the factor of 10 so that smoothnesses don't have to be tiny numbers)
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double delta = (m_Target - m_Current) * (1.0 - p);
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m_Current += delta;
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return static_cast<float>(delta);
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}
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void CSmoothedValue::Wrap(float min, float max)
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{
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double t = fmod(m_Target - min, static_cast<double>(max - min));
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if (t < 0)
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t += max - min;
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t += min;
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m_Current += t - m_Target;
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m_Target = t;
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}
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