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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "EaseInOutAnim.h"
#include "../player/Player.h"
#include "../base/MathHelper.h"
#include <math.h>
using namespace boost::python;
using namespace std;
namespace avg {
EaseInOutAnim::EaseInOutAnim(const object& node, const string& sAttrName,
long long duration, const object& startValue, const object& endValue,
long long easeInDuration, long long easeOutDuration, bool bUseInt,
const object& startCallback, const object& stopCallback)
: SimpleAnim(node, sAttrName, duration, startValue, endValue, bUseInt, startCallback,
stopCallback),
m_EaseInDuration(float(easeInDuration)/duration),
m_EaseOutDuration(float(easeOutDuration)/duration)
{
}
EaseInOutAnim::~EaseInOutAnim()
{
}
float EaseInOutAnim::interpolate(float t)
{
float accelDist = m_EaseInDuration*2/PI;
float decelDist = m_EaseOutDuration*2/PI;
float dist;
if (t<m_EaseInDuration) {
// Acceleration stage
float nt = t/m_EaseInDuration;
float s = sin(-PI/2+nt*PI/2)+1;
dist = s*accelDist;
} else if (t > 1-m_EaseOutDuration) {
// Deceleration stage
float nt = (t-(1-m_EaseOutDuration))/m_EaseOutDuration;
float s = sin(nt*PI/2);
dist = accelDist+(1-m_EaseInDuration-m_EaseOutDuration)+s*decelDist;
} else {
// Linear stage
dist = accelDist+t-m_EaseInDuration;
}
return dist/(accelDist+(1-m_EaseInDuration-m_EaseOutDuration)+decelDist);
}
}
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