Search  

---

C:/temp/src/j2k/QNX4/Group5/Model.hpp

Go to the documentation of this file.

/***
   NAME
     model
   PURPOSE
     Model for fake train/track until the lab's ready
   HISTORY
     b_goudre -- Feb 28, 2000: Created.
***/
#ifndef __J2K__Train__Model_HPP__
#define __J2K__Train__Model_HPP__

#include "timer.hh"
#include "constants.h"

typedef enum SwitchStatus switchpoint_t;

/*
enum switchpoint_t
{
  STRAIGHT,
  CURVED
};
*/

class Model_track
{
private:
  static const char   next_sector_[][][];
  static const char   relevant_switch_[];
  switchpoint_t points_[4];
public:
  Model_track() {
    points_[0] = points_[1] = points_[2] = points_[3] = STRAIGHT;
  }

  void switch_point(int pt, switchpoint_t to)
  {
    points_[pt] = to;
  }
};

    
class Model_train
{
private:
  double speed_;              // -14..14
  double pos_in_track_;       // 0 to 1.0; at 14, takes 4 ticks to travel
  double inertia_;            // increase/decrease per period
  static const double friction_; // decrease when slowing
  double actual_speed_;       // real speed now
  char sector_;               // sector number
  Model_track* track_;        // track object for position updates

public:
  Model_train(Model_track* t, char sect, double inert, double pos = 0.0);

  void   set_speed(signed char speed) { speed_ = speed; }
  double get_pos() const { return pos_in_track_; }
  char   get_sector() const { return sector_; }

  void tick();
};



class Fake_controller : public Timer_thread
{
private:
    Model_track track_;
    Model_train train1_, train2_, train4_;
public:
    Fake_controller();
    virtual void tick();

    // exposed methods
    unsigned short get_position_mask();
    boolean set_train_speed(int num, signed char spd);
    boolean set_switch(int num, switchpoint_t pos);

    // I added this because I'm sick and tired of duplicating
    // the track layout!
    // NOTE: THIS IS NOT A MESSAGE-BASED METHOD!!! IT GETS CALLED
    // DIRECTLY (see proxy, below).  THIS IMPLIES IT RUNS IN YOUR
    // THREAD!  THERE'S A VERY GOOD REASON FOR THIS!
    // ALSO NOTE POSSIBLE RACE CONDITION!  BE CAREFUL!
    char next_position(char current_pos, signed char direction);
private:
    DECLARE_MESSAGE_TABLE;
};

class Fake_controller_proxy
{
private:
    Fake_controller ctrl_;
public:
    Fake_controller_proxy(int msec, int alg, int prio);
    ~Fake_controller_proxy();

    unsigned short get_position_mask();
    boolean set_train_speed(int num, signed char spd);
    boolean set_switch(int num, switchpoint_t pos);
    // NOTE!!! CALLED IN YOUR THREAD!!!
    char next_position(char current_pos, signed char direction)
    {
        return ctrl_.next_position(current_pos, direction);
    }
};

#endif /* __MODEL__DEFINED */

---