source/sequencer.h

   1 #ifndef MSP_DEMOSCENE_SEQUENCER_H_
   2 #define MSP_DEMOSCENE_SEQUENCER_H_
   3
   4 #include <vector>
   5 #include <sigc++/signal.h>
   6 #include <msp/time/timedelta.h>
   7 #include <msp/time/timestamp.h>
   8
   9 class Action;
  10
  11 class Sequencer
  12 {
  13 private:
  14         struct Segment
  15         {
  16                 Action *action;
  17                 float start_beat;
  18                 float end_beat;
  19         };
  20
  21 public:
  22         sigc::signal<void> signal_finished;
  23
  24 private:
  25         Msp::Time::TimeDelta secs_per_beat;
  26         std::vector<Action *> static_actions;
  27         std::vector<Segment> segments;
  28         std::vector<Segment>::const_iterator begin;
  29         std::vector<Segment>::const_iterator end;
  30         bool started;
  31         float beat;
  32         float next_event;
  33
  34 public:
  35         Sequencer(float = 120.0f);
  36
  37         void set_beats_per_minute(float);
  38         float get_beats_per_minute() const { return Msp::Time::min/secs_per_beat; }
  39         void add_static_action(Action &);
  40         void add_action(Action &, float, float);
  41
  42         void start();
  43         void seek(float);
  44         void tick(const Msp::Time::TimeDelta &);
  45 private:
  46         void advance_to(float);
  47         void update_next_event();
  48 public:
  49         float get_current_beat() const { return beat; }
  50 };
  51
  52 #endif