Worcester polytechnic institute

Figure 7 – Interaction with doors

What happens behind the scenes after the user enters the password is relatively 

there has to be a mechanism to check the entered password against the 

word stored in the door settings.  However, there is a small difficulty for when 

the password is correct.  Because the doors are meant to keep people out, there has to be a 

mechanism that checks if this is the case, so as not to ask the users for a passwor

order to be able to leave a room.  Such behavior would not make much sense in the first 

place and would probably not please the users of the system.  This problem is partially 

solved by checking the user’s current coordinates in relation to the door’s coordinates and 

thus figuring out if the user is inside or outside of the room.  This works fine for doors 

that are positioned in the north-south orientation, with the “outside” being on the south 

variable has to be added to the door XML description file that shows 

where the outside of the door is facing, so that the right set of coordinates are checked to 

determine where the user is located.

Activate 

door

2

• Enter 

password 

until correct

3

• Transport to 

the room

18

What happens behind the scenes after the user enters the password is relatively 

there has to be a mechanism to check the entered password against the 

word stored in the door settings.  However, there is a small difficulty for when 

the password is correct.  Because the doors are meant to keep people out, there has to be a 

mechanism that checks if this is the case, so as not to ask the users for a password in 

order to be able to leave a room.  Such behavior would not make much sense in the first 

This problem is partially 

coordinates and 

thus figuring out if the user is inside or outside of the room.  This works fine for doors 

being on the south 

ML description file that shows 

where the outside of the door is facing, so that the right set of coordinates are checked to 

Transport to 

the room

4

---

19