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cLerpInterval.h
00001 // Filename: cLerpInterval.h
00002 // Created by:  drose (27Aug02)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef CLERPINTERVAL_H
00016 #define CLERPINTERVAL_H
00017 
00018 #include "directbase.h"
00019 #include "cInterval.h"
00020 
00021 ////////////////////////////////////////////////////////////////////
00022 //       Class : CLerpInterval
00023 // Description : The base class for a family of intervals that
00024 //               linearly interpolate one or more numeric values over
00025 //               time.
00026 ////////////////////////////////////////////////////////////////////
00027 class EXPCL_DIRECT CLerpInterval : public CInterval {
00028 PUBLISHED:
00029   enum BlendType {
00030     BT_no_blend,
00031     BT_ease_in,
00032     BT_ease_out,
00033     BT_ease_in_out,
00034     BT_invalid
00035   };
00036 
00037 public:
00038   INLINE CLerpInterval(const string &name, double duration, 
00039                        BlendType blend_type);
00040 
00041 PUBLISHED:
00042   INLINE BlendType get_blend_type() const;
00043 
00044   static BlendType string_blend_type(const string &blend_type);
00045 
00046 protected:
00047   double compute_delta(double t) const;
00048 
00049 private:
00050   BlendType _blend_type;
00051 
00052   
00053 public:
00054   static TypeHandle get_class_type() {
00055     return _type_handle;
00056   }
00057   static void init_type() {
00058     CInterval::init_type();
00059     register_type(_type_handle, "CLerpInterval",
00060                   CInterval::get_class_type());
00061   }
00062   virtual TypeHandle get_type() const {
00063     return get_class_type();
00064   }
00065   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00066 
00067 private:
00068   static TypeHandle _type_handle;
00069 };
00070 
00071 #include "cLerpInterval.I"
00072 
00073 #endif
00074 
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