1 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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2 | * |
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3 | * This library is open source and may be redistributed and/or modified under |
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4 | * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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5 | * (at your option) any later version. The full license is in LICENSE file |
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6 | * included with this distribution, and on the openscenegraph.org website. |
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7 | * |
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8 | * This library is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * OpenSceneGraph Public License for more details. |
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12 | */ |
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13 | //osgParticle - Copyright (C) 2002 Marco Jez |
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14 | |
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15 | #ifndef OSGPARTICLE_INTERPOLATOR |
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16 | #define OSGPARTICLE_INTERPOLATOR |
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17 | |
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18 | #include <osgParticle/range> |
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19 | |
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20 | #include <osg/CopyOp> |
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21 | #include <osg/Object> |
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22 | #include <osg/Vec2> |
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23 | #include <osg/Vec3> |
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24 | #include <osg/Vec4> |
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25 | |
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26 | namespace osgParticle |
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27 | { |
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28 | |
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29 | /// An abstract base class for implementing interpolators. |
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30 | class Interpolator : public osg::Object { |
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31 | public: |
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32 | Interpolator() |
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33 | : osg::Object() {} |
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34 | |
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35 | Interpolator(const Interpolator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY) |
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36 | : osg::Object(copy, copyop) {} |
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37 | |
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38 | virtual const char* libraryName() const { return "osgParticle"; } |
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39 | virtual const char* className() const { return "Interpolator"; } |
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40 | virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const Interpolator* >(obj) != 0; } |
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41 | |
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42 | /// Interpolate between floats. Must be overriden in descendant classes. |
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43 | virtual float interpolate(float t, float y1, float y2) const = 0; |
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44 | |
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45 | /// Interpolate between 2-dimensional vectors. Default behavior is to interpolate each component separately. |
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46 | virtual osg::Vec2 interpolate(float t, const osg::Vec2& y1, const osg::Vec2& y2) const |
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47 | { |
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48 | return osg::Vec2( |
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49 | interpolate(t, y1.x(), y2.x()), |
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50 | interpolate(t, y1.y(), y2.y()) |
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51 | ); |
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52 | } |
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53 | |
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54 | /// Interpolate between 3-dimensional vectors. Default behavior is to interpolate each component separately. |
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55 | virtual osg::Vec3 interpolate(float t, const osg::Vec3& y1, const osg::Vec3& y2) const |
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56 | { |
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57 | return osg::Vec3( |
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58 | interpolate(t, y1.x(), y2.x()), |
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59 | interpolate(t, y1.y(), y2.y()), |
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60 | interpolate(t, y1.z(), y2.z()) |
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61 | ); |
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62 | } |
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63 | |
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64 | /// Interpolate between 4-dimensional vectors. Default behavior is to interpolate each component separately. |
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65 | virtual osg::Vec4 interpolate(float t, const osg::Vec4& y1, const osg::Vec4& y2) const |
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66 | { |
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67 | return osg::Vec4( |
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68 | interpolate(t, y1.x(), y2.x()), |
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69 | interpolate(t, y1.y(), y2.y()), |
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70 | interpolate(t, y1.z(), y2.z()), |
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71 | interpolate(t, y1.w(), y2.w()) |
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72 | ); |
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73 | } |
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74 | |
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75 | template<class ValueType> |
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76 | ValueType interpolate(float t, const range<ValueType>& r) const |
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77 | { |
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78 | return interpolate(t, r.minimum, r.maximum); |
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79 | } |
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80 | |
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81 | protected: |
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82 | virtual ~Interpolator() {} |
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83 | }; |
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84 | |
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85 | } |
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86 | |
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87 | #endif |
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