//elevator.h

#include "passenger.h"

class Elevator : public Passenger
{
  public:
     int floorNo,
         x, y;                         // ==> (x,y) position of elevator
  
     /* constructor of the elevator for displaying on the screen           */
     /* the arguments are the position of elevator                         */
     Elevator (int, int);
     
     /* member function used to move elevator by displaying and clearing   */
     /* the elevator every step it moves                                   */
     void move(int);
     
     /* member function to move elevator down                              */
     void movedown(int);
     
     /* member function to move elevator up                                */
     void moveup(int);
     
     /* member function that will decide whether the elevator should move  */
     /* down or up by accepting the destination position of elevator       */
     void movewhere(int);
};

Elevator :: Elevator ( int xpos, int ypos )
{
     x = xpos;
     y = ypos;
     int i;

     textattr(15 | 4*16); 
     for (i=1; i<y; i++)
      {
      gotoxy(x+2,i);  cprintf("³");
      }
     gotoxy(x,y);     cprintf("ÚÄÁÄ¿");
     gotoxy(x,y+1);   cprintf("³   ³");
     gotoxy(x,y+2);   cprintf("ÀÄÄÄÙ");
}

void Elevator :: move( int y )
{
     textattr(15 | 4*16); 

     int i;
     for(i=1; i<y; i++)
      { gotoxy(x+2,y-1);   cprintf("³");
      }

      gotoxy(x,y);     cprintf("ÚÄÁÄ¿");
      gotoxy(x,y+1);   cprintf("³   ³");
      gotoxy(x,y+2);   cprintf("ÀÄÄÄÙ");
      Sleep(500);

      gotoxy(x,y);     cprintf("     ");
      gotoxy(x,y+1);   cprintf("     ");
      gotoxy(x,y+2);   cprintf("     ");
}

void Elevator :: movedown (int dest)
   {
     int i;
     for( i=y ; i<=dest; ++i)  {  move(i);   }
     y = i-1;
     Elevator(x,y);
   }

void Elevator :: moveup (int dest)
   {
     int i;
     for( i=y ; i>=dest; i--)  {  move(i);   }
     y = i+1;
     Elevator(x,y);
   }

void Elevator :: movewhere ( int ypos )
   {
     int decidemove;
     decidemove = ypos - y;
     if (decidemove > 0)   movedown (ypos);
                    else   moveup (ypos);
   }