Checked in osgParticle, writtten by Marco Jez.

include/osgParticle/Interpolator

@@ -0,0 +1,77 @@
+//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
+//Distributed under the terms of the GNU Library General Public License (LGPL)
+//as published by the Free Software Foundation.
+//osgParticle - Copyright (C) 2002 Marco Jez
+
+#ifndef OSGPARTICLE_INTERPOLATOR_
+#define OSGPARTICLE_INTERPOLATOR_
+
+#include <osgParticle/range>
+
+#include <osg/CopyOp>
+#include <osg/Object>
+#include <osg/Vec2>
+#include <osg/Vec3>
+#include <osg/Vec4>
+
+namespace osgParticle
+{
+
+    /// An abstract base class for implementing interpolators.
+    class Interpolator : public osg::Object {
+    public:
+        Interpolator()
+        : osg::Object() {}
+        
+        Interpolator(const Interpolator &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY)
+        : osg::Object(copy, copyop) {}
+        
+        virtual const char *className() const { return "Interpolator"; }
+        virtual bool isSameKindAs(const osg::Object *obj) const { return dynamic_cast<const Interpolator *>(obj) != 0; }
+                
+        /// Interpolate between floats. Must be overriden in descendant classes.
+        virtual float interpolate(float t, float y1, float y2) const = 0;    
+        
+        /// Interpolate between 2-dimensional vectors. Default behavior is to interpolate each component separately.
+        virtual osg::Vec2 interpolate(float t, const osg::Vec2 &y1, const osg::Vec2 &y2) const
+        {
+            return osg::Vec2(
+                interpolate(t, y1.x(), y2.x()),
+                interpolate(t, y1.y(), y2.y())
+            );
+        }
+
+        /// Interpolate between 3-dimensional vectors. Default behavior is to interpolate each component separately.
+        virtual osg::Vec3 interpolate(float t, const osg::Vec3 &y1, const osg::Vec3 &y2) const
+        {
+            return osg::Vec3(
+                interpolate(t, y1.x(), y2.x()),
+                interpolate(t, y1.y(), y2.y()),
+                interpolate(t, y1.z(), y2.z())
+            );
+        }
+        
+        /// Interpolate between 4-dimensional vectors. Default behavior is to interpolate each component separately.
+        virtual osg::Vec4 interpolate(float t, const osg::Vec4 &y1, const osg::Vec4 &y2) const
+        {
+            return osg::Vec4(
+                interpolate(t, y1.x(), y2.x()),
+                interpolate(t, y1.y(), y2.y()),
+                interpolate(t, y1.z(), y2.z()),
+                interpolate(t, y1.w(), y2.w())
+            );
+        }
+        
+        template<class T_>
+        T_ interpolate(float t, const range<T_> &r) const
+        {
+            return interpolate(t, r.min, r.max);
+        }
+        
+    protected:
+        virtual ~Interpolator() {}
+    };
+
+}
+
+#endif