source/action.cpp

   1 #include "action.h"
   2
   3 InterpolationAction::InterpolationAction(bool h):
   4         hermite(h),
   5         start_beat(0),
   6         duration(0)
   7 { }
   8
   9 void InterpolationAction::start(float b, float d)
  10 {
  11         start_beat = b;
  12         duration = d;
  13         interpolate(0.0f, 0.0f);
  14 }
  15
  16 void InterpolationAction::tick(float b, float d)
  17 {
  18         if(duration)
  19         {
  20                 float t = (b-start_beat)/duration;
  21                 float dt = d/duration;
  22                 if(hermite)
  23                 {
  24                         dt = t-dt;
  25                         t = (3-2*t)*t*t;
  26                         dt = t-(3-2*dt)*dt*dt;
  27                 }
  28                 interpolate(t, dt);
  29         }
  30         else
  31                 interpolate(1.0f, 1.0f);
  32 }
  33
  34 void InterpolationAction::end(float)
  35 {
  36         interpolate(1.0f, 0.0f);
  37 }