Drone Grid Case Study: Creating the Enemies - Beginning Android 3D Game Development - page 286

The m_NumberRoundsFired variable keeps track of the number of rounds of ammunition fired for
each burst.
private int m_NumberRoundsFired = 0;
The m_TimeIntervalBetweenFiring variable sets the time interval between successive bursts of the
tank's weapon.
private long m_TimeIntervalBetweenFiring = 0;
The m_StartTimeFiring variable holds the last time that the tank has fired its weapon.
private long m_StartTimeFiring = 0;
The m_FireWeapon variable holds true if the tank's weapon should be fired and false otherwise.
private boolean m_FireWeapon = false;
The constructor for the StateTankSteerWayPoint class calls the constructor for the StateTank
superclass with the FSM_StatesTank id, which identifies which state this is to the finite state machine
and the Driver parent object that contains information about this vehicle's commands and the tank
object. (See Listing 8-29.)
Listing 8-29. The Constructor
StateTankSteerWayPoint(FSM_StatesTank ID, Driver Parent)
{
super(ID, Parent);
}
The Enter() function is called when this state is first entered by the finite state machine. The function
initializes key variables. Some data is from the parent Driver class object, such as the current
waypoint, waypoint radius, or data from the vehicle command. The Enter() function also lets the
parent Driver class object know that the currently executing command is the patrol/attack command.
(See Listing 8-30.)
Listing 8-30. Entering the State for the First Time
void Enter()
{
// Weapon is not firing when state is entered initially
m_NumberRoundsFired = 0;
m_FireWeapon = false;
// Get WayPoint Data
m_WayPoint = GetParent().GetWayPoint();
m_WayPointRadius = GetParent().GetWayPointRadius();
// Get Targeting and firing parameters
m_Target = GetParent().GetCurrentOrder().GetTarget();
m_TargetObj = GetParent().GetCurrentOrder().GetTargetObject();