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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 "BezierCurve.h"
#include "GLMHelper.h"
#include <iostream>
using namespace std;
namespace avg {
BezierCurve::BezierCurve(const glm::vec2& p0, const glm::vec2& p1, const glm::vec2& p2,
const glm::vec2& p3)
: m_P0(p0),
m_P1(p1),
m_P2(p2),
m_P3(p3)
{
}
glm::vec2 BezierCurve::interpolate(float t) const
{
return (1.f-t)*(1.f-t)*(1.f-t)*m_P0+
3.f*t*(1.f-t)*(1.f-t) *m_P1+
3.f*t*t*(1.f-t) *m_P2+
t*t*t *m_P3;
}
glm::vec2 BezierCurve::getDeriv(float t) const
{
return 3.f*(m_P1-m_P0)*(1.f-t)*(1.f-t)+
6.f*(m_P2-m_P1)*(1.f-t)*t+
3.f*(m_P3-m_P2)*t*t;
}
}
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