88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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//osgParticle - Copyright (C) 2002 Marco Jez
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#ifndef OSGPARTICLE_INTERPOLATOR
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#define OSGPARTICLE_INTERPOLATOR
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#include <osgParticle/range>
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#include <osg/CopyOp>
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#include <osg/Object>
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#include <osg/Vec2>
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#include <osg/Vec3>
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#include <osg/Vec4>
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namespace osgParticle
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{
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/// An abstract base class for implementing interpolators.
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class Interpolator : public osg::Object {
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public:
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Interpolator()
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: osg::Object() {}
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Interpolator(const Interpolator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY)
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: osg::Object(copy, copyop) {}
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virtual const char* libraryName() const { return "osgParticle"; }
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virtual const char* className() const { return "Interpolator"; }
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virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Interpolator* >(obj) != 0; }
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/// Interpolate between floats. Must be overridden in descendant classes.
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virtual float interpolate(float t, float y1, float y2) const = 0;
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/// Interpolate between 2-dimensional vectors. Default behavior is to interpolate each component separately.
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virtual osg::Vec2 interpolate(float t, const osg::Vec2& y1, const osg::Vec2& y2) const
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{
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return osg::Vec2(
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interpolate(t, y1.x(), y2.x()),
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interpolate(t, y1.y(), y2.y())
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);
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}
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/// Interpolate between 3-dimensional vectors. Default behavior is to interpolate each component separately.
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virtual osg::Vec3 interpolate(float t, const osg::Vec3& y1, const osg::Vec3& y2) const
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{
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return osg::Vec3(
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interpolate(t, y1.x(), y2.x()),
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interpolate(t, y1.y(), y2.y()),
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interpolate(t, y1.z(), y2.z())
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);
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}
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/// Interpolate between 4-dimensional vectors. Default behavior is to interpolate each component separately.
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virtual osg::Vec4 interpolate(float t, const osg::Vec4& y1, const osg::Vec4& y2) const
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{
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return osg::Vec4(
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interpolate(t, y1.x(), y2.x()),
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interpolate(t, y1.y(), y2.y()),
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interpolate(t, y1.z(), y2.z()),
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interpolate(t, y1.w(), y2.w())
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);
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}
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template<class ValueType>
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ValueType interpolate(float t, const range<ValueType>& r) const
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{
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return interpolate(t, r.minimum, r.maximum);
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}
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protected:
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virtual ~Interpolator() {}
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};
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}
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#endif
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