public (bool canMove, Obstacle ob) ProcessSingleCommand(char command)
{
if (!VALID_COMMANDS.Contains(command))
{
throw new BadCommandException("Invalid Command Character");
}
RoverCoordinates current = this.Coordinates;
RoverCoordinates proposed = current;
if (command.Equals('F'))
{
switch (this.Direction)
{
case Direction.North:
proposed.yPos++;
break;
case Direction.West:
proposed.xPos--;
break;
case Direction.South:
proposed.yPos--;
break;
case Direction.East:
proposed.xPos++;
break;
default:
break;
}
}
else if (command.Equals('B'))
{
switch (this.Direction)
{
case Direction.North:
proposed.yPos--;
break;
case Direction.West:
proposed.xPos++;
break;
case Direction.South:
proposed.yPos++;
break;
case Direction.East:
proposed.xPos--;
break;
default:
break;
}
}
else if (command.Equals('L'))
{
switch (this.Direction)
{
case Direction.North:
case Direction.West:
case Direction.South:
this.Direction++;
break;
case Direction.East:
this.Direction = Direction.North;
break;
default:
break;
}
return(true, null);
}
else // command.equals('R')
{
switch (this.Direction)
{
case Direction.North:
this.Direction = Direction.East;
break;
case Direction.West:
case Direction.South:
case Direction.East:
this.Direction--;
break;
default:
break;
}
return(true, null);
}
// check if proposed move is into an obstacle
bool canMove = !(ObstacleService.IsPointAnObstacle(proposed.xPos, proposed.yPos));
if (canMove)
{
MoveRover(proposed);
return(true, null);
}
else
{
return(false, new Obstacle(proposed.xPos, proposed.yPos));
}
}
public Rover()
{
this.ObstacleService = new ObstacleService();
Coordinates = new RoverCoordinates(0, 0);
Direction = Direction.North;
}
public Rover(RoverCoordinates roverCoordinates, Direction dir)
{
this.Coordinates = roverCoordinates;
this.Direction = dir;
}
private void MoveRover(RoverCoordinates proposed)
{
this.Coordinates = proposed;
}