source/animation.h

   1 #ifndef MSP_GL_ANIMATION_H_
   2 #define MSP_GL_ANIMATION_H_
   3
   4 #include <msp/core/refptr.h>
   5 #include <msp/datafile/objectloader.h>
   6 #include <msp/time/timedelta.h>
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 class KeyFrame;
  12 class Matrix;
  13
  14 /**
  15 An Animation is a sequence of KeyFrames combined with timing information.  The
  16 state at any point in the animation can be interpolated from the keyframes.
  17 */
  18 class Animation
  19 {
  20 public:
  21         class Loader: public DataFile::CollectionObjectLoader<Animation>
  22         {
  23         private:
  24                 Time::TimeDelta current_time;
  25
  26         public:
  27                 Loader(Animation &);
  28                 Loader(Animation &, Collection &);
  29         private:
  30                 void init();
  31
  32                 void keyframe(const std::string &);
  33                 void keyframe_inline();
  34                 void interval(float);
  35         };
  36
  37 private:
  38         struct AxisInterpolation
  39         {
  40                 float slope;
  41                 float scale;
  42
  43                 AxisInterpolation();
  44         };
  45
  46         struct TimedKeyFrame
  47         {
  48                 const TimedKeyFrame *prev;
  49                 Time::TimeDelta time;
  50                 Time::TimeDelta delta_t;
  51                 RefPtr<const KeyFrame> keyframe;
  52                 AxisInterpolation axes[3];
  53         };
  54
  55         typedef std::list<TimedKeyFrame> KeyFrameList;
  56
  57 public:
  58         class Iterator
  59         {
  60         private:
  61                 const Animation &animation;
  62                 KeyFrameList::const_iterator iter;
  63                 Time::TimeDelta time_since_keyframe;
  64                 bool end;
  65
  66         public:
  67                 Iterator(const Animation &);
  68
  69                 Iterator &operator+=(const Time::TimeDelta &);
  70
  71                 bool is_end() const { return end; }
  72                 Matrix get_matrix() const;
  73         };
  74
  75 private:
  76         KeyFrameList keyframes;
  77         bool looping;
  78
  79 public:
  80         Animation();
  81
  82         void add_keyframe(const Time::TimeDelta &, const KeyFrame &);
  83         void set_looping(bool);
  84 private:
  85         void prepare_keyframe(TimedKeyFrame &);
  86
  87         Matrix compute_matrix(const TimedKeyFrame &, const Time::TimeDelta &) const;
  88 };
  89
  90 } // namespace GL
  91 } // namespace Msp
  92
  93 #endif