SOFTWARE DESIGN

Finite state machines are heavily used in the implementation of Last Line. Each component has its own finite state machine. For the following, it is a detail explanation of how to the finite state machines and data structures used to keep track of the state of each component.

Finite State Machine:

Enemy:

Boss:

Bullet:

       Normal:
         wait
         time to fire and go to Fire
     Flying:
         if collide with something then go to Die
         else wait for time and go to Die
     Die:
         explosion and disappears
         go to Normal
     Fire:
         get player coordinates and fly toward that coordinate
         go to Flying

Different Data Structure:

Enemy Bullet:

We use an array to implement the FSM for the enemy bullets:

 

Bullet ID

Duration of Flying

X Coordinate of player

Y Coordinate of player

Y Coordinate of player

Flying Status

 

Enemy and Boss:

We use an array to implement the FSM for the boss and enemy:

 

Enemy ID

Starting Time of Flying

Duration of Flying

Signal to Turn

Get Hit

Time to Wait for Next Shoot

Signal to Shoot

X Coordinate in First Quadrum

Y Coordinate in First Quadrum

X Coordinate in Second Quadrum

Y Coordinate in Second Quadrum

X Coordinate in Third Quadrum

Y Coordinate in Third Quadrum

X Coordinate in Fourth Quadrum

Y Coordinate in Fourth Quadrum

Current Index for Quadrum Coordinates

Starting Time for Enemy Die

Duration of Enemy Die