1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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.
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.
13//osgParticle - Copyright (C) 2002 Marco Jez
15#ifndef OSGPARTICLE_INTERPOLATOR
16#define OSGPARTICLE_INTERPOLATOR
18#include <osgParticle/range>
29 /// An abstract base class for implementing interpolators.
30 class Interpolator : public osg::Object {
35 Interpolator(const Interpolator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY)
36 : osg::Object(copy, copyop) {}
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; }
42 /// Interpolate between floats. Must be overridden in descendant classes.
43 virtual float interpolate(float t, float y1, float y2) const = 0;
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
49 interpolate(t, y1.x(), y2.x()),
50 interpolate(t, y1.y(), y2.y())
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
58 interpolate(t, y1.x(), y2.x()),
59 interpolate(t, y1.y(), y2.y()),
60 interpolate(t, y1.z(), y2.z())
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
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())
75 template<class ValueType>
76 ValueType interpolate(float t, const range<ValueType>& r) const
78 return interpolate(t, r.minimum, r.maximum);
82 virtual ~Interpolator() {}