public bool DownButtonPressed(ElevatorStatus currentElevatorStatus)
{
if (FloorNumber != LowestFloor)
{
DownButton = true;
Priority = CalculatePriority(currentElevatorStatus);
} //-- On lowest floor, there is no down button. Hence no else block is reqd
return(DownButton);
}
public bool UpButtonPressed(ElevatorStatus currentElevatorStatus)
{
if (FloorNumber != HighestFloor)
{
UpButton = true;
Priority = CalculatePriority(currentElevatorStatus);
} //-- On Highest floor, there is no up button. Hence no else block is reqd
return(UpButton);
}
int CalculatePriority(ElevatorStatus currentElevatorStatus)
{
int currentElevatorPos = currentElevatorStatus.currentElevatorFloor;
ElevatorDirectionEnum currentElevatorDir = currentElevatorStatus.currentElevatorDirection;
int Multiplier = 0;
int RelativeWeight = HighestFloor - Math.Abs(FloorNumber - currentElevatorPos); // Weight of difference between elevator's current floor and this floor.
int direction_hint = FloorNumber - currentElevatorPos;
/*
* You can be in one of 4 cases:
* 1. Elevator is in maintenence mode (so priority is of no use and it is returned as 0)
* 2. Elevator is currently idle, so it will service your request next (priority will be medium : say P2)
* 3. Elevator is currently moving towards your floor.
* a. You want to move in same direction as elevator is currently moving. Ideally we should make the elevator stop at your floor. (priority will be highest : say P3)
* b. You want to move in opposite direction as elevator is moving. (priority will be medium : say P2)
* 4. Elevator is currently moving away from your floor.
* a. You want to move in same direction as elevator is currently moving. You request will not be service until we reach case 2 or 3 (priority will be lowest : say P1)
* b. You want to move in opposite direction as elevator is moving. You request will not be service until we reach case 2 or 3 (priority will be lowest : say P1)
*/
if (currentElevatorDir == ElevatorDirectionEnum.Maintenence)
{
// Case 1: Elevator is in maintenence mode, prioirty is 0.
goto ExitPoint;
}
if (currentElevatorDir == ElevatorDirectionEnum.Idle)
{
// Case 2: Elevator is currently idle. It will service your request next.
Multiplier = 2;
goto ExitPoint;
}
if (((direction_hint > 0) && (currentElevatorDir == ElevatorDirectionEnum.GoingUp)) ||
((direction_hint < 0) && (currentElevatorDir == ElevatorDirectionEnum.GoingDown)))
{ // This means the Elevator is moving towards your floor: Case 3
if (UpButton && (currentElevatorDir == ElevatorDirectionEnum.GoingUp))
{
Multiplier = 3;
}
else if (DownButton && (currentElevatorDir == ElevatorDirectionEnum.GoingDown))
{
Multiplier = 3;
}
else
{
Multiplier = 2;
}
}
else
{
// Elevator is currently moving away from your floor: Case 4
Multiplier = 1;
}
ExitPoint:
return(RelativeWeight * Multiplier);
}
public ElevatorClass()
{
currStatus = new ElevatorStatus();
AllFloorControls = new FloorControls[11];
currStatus.currentElevatorDirection = ElevatorDirectionEnum.Idle;
currStatus.currentElevatorFloor = 0;
for (int i = 0; i < 11; i++)
{
AllFloorControls[i] = new FloorControls();
AllFloorControls[i].FloorNumber = i;
}
}
