root/OpenSceneGraph/trunk/include/osgParticle/Interpolator @ 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_INTERPOLATOR
16#define OSGPARTICLE_INTERPOLATOR
17
18#include <osgParticle/range>
19
20#include <osg/CopyOp>
21#include <osg/Object>
22#include <osg/Vec2>
23#include <osg/Vec3>
24#include <osg/Vec4>
25
26namespace osgParticle
27{
28
29    /// An abstract base class for implementing interpolators.
30    class Interpolator : public osg::Object {
31    public:
32        Interpolator()
33        : osg::Object() {}
34
35        Interpolator(const Interpolator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY)
36        : osg::Object(copy, copyop) {}
37
38        virtual const char* libraryName() const { return "osgParticle"; }
39        virtual const char* className() const { return "Interpolator"; }
40        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Interpolator* >(obj) != 0; }
41
42        /// Interpolate between floats. Must be overriden in descendant classes.
43        virtual float interpolate(float t, float y1, float y2) const = 0;
44
45        /// Interpolate between 2-dimensional vectors. Default behavior is to interpolate each component separately.
46        virtual osg::Vec2 interpolate(float t, const osg::Vec2& y1, const osg::Vec2& y2) const
47        {
48            return osg::Vec2(
49                interpolate(t, y1.x(), y2.x()),
50                interpolate(t, y1.y(), y2.y())
51            );
52        }
53
54        /// Interpolate between 3-dimensional vectors. Default behavior is to interpolate each component separately.
55        virtual osg::Vec3 interpolate(float t, const osg::Vec3& y1, const osg::Vec3& y2) const
56        {
57            return osg::Vec3(
58                interpolate(t, y1.x(), y2.x()),
59                interpolate(t, y1.y(), y2.y()),
60                interpolate(t, y1.z(), y2.z())
61            );
62        }
63
64        /// Interpolate between 4-dimensional vectors. Default behavior is to interpolate each component separately.
65        virtual osg::Vec4 interpolate(float t, const osg::Vec4& y1, const osg::Vec4& y2) const
66        {
67            return osg::Vec4(
68                interpolate(t, y1.x(), y2.x()),
69                interpolate(t, y1.y(), y2.y()),
70                interpolate(t, y1.z(), y2.z()),
71                interpolate(t, y1.w(), y2.w())
72            );
73        }
74
75        template<class ValueType>
76        ValueType interpolate(float t, const range<ValueType>& r) const
77        {
78            return interpolate(t, r.minimum, r.maximum);
79        }
80
81    protected:
82        virtual ~Interpolator() {}
83    };
84
85}
86
87#endif
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