root/OpenSceneGraph/trunk/include/osgParticle/LinearInterpolator @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13//osgParticle - Copyright (C) 2002 Marco Jez
14
15#ifndef OSGPARTICLE_LINEARINTERPOLATOR
16#define OSGPARTICLE_LINEARINTERPOLATOR
17
18#include <osgParticle/Interpolator>
19
20#include <osg/CopyOp>
21#include <osg/Object>
22#include <osg/Vec3>
23#include <osg/Vec4>
24
25namespace osgParticle
26{
27
28    /// A linear interpolator.
29    class LinearInterpolator: public Interpolator
30    {
31    public:
32        LinearInterpolator()
33        : Interpolator() {}
34
35        LinearInterpolator(const LinearInterpolator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY)
36        : Interpolator(copy, copyop) {}
37
38        META_Object(osgParticle, LinearInterpolator);
39
40        virtual float interpolate(float t, float y1, float y2) const
41        {
42            return y1 + (y2 - y1) * t;
43        }
44
45    protected:
46        virtual ~LinearInterpolator() {}
47    };
48
49}
50
51#endif
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