Drone Grid Case Study: Creating the Enemies - Beginning Android 3D Game Development - page 273

Process
Command
State

Waypoint Reached = true Command = Patrol

Patrol/
Attack
State

Waypoint Reached = false

Figure 8-5. The tank's finite state machine

The FSM_StatesTank enumeration identifies the different state ids used internally within the tank
state machine so that the state machine can identify and transition to the corresponding state
when needed.
The FSM_StatesTank enumeration (see Listing 8-9) consists of
FSM_STATE_NONE : This indicates no state.
FSM_STATE_STEER_WAYPOINT : This state id corresponds to the
patrol/attack state.
FSM_STATE_PROCESS_COMMAND : This state id corresponds to the
process command state.

Listing 8-9. The Tank States

enum FSM_StatesTank
{
FSM_STATE_NONE,
FSM_STATE_STEER_WAYPOINT,
FSM_STATE_PROCESS_COMMAND,
};

The StateTank class holds the base class from which all other states for the tank are derived.
The m_Parent variable holds a reference to the driver of the tank and provides access to the
commands and data given to the AI-controlled vehicle and the tank object itself.

private Driver m_Parent;