public void MoveShip(ShipMove move)
{
if (move.Direction == MoveDirection.Left ||
move.Direction == MoveDirection.Right)
{
var turnsToMake = move.Amount / 90;
int turnModifier;
if (move.Direction == MoveDirection.Left)
{
// 3 rights make a left
turnModifier = 3;
}
else
{
turnModifier = 1;
}
var rightTurns = turnsToMake * turnModifier;
for (var i = 0; i < rightTurns; i++)
{
var yTemp = waypointY;
// Y becomes the previous x
waypointY = waypointX;
// X becomes y * -1
waypointX = yTemp * -1;
//WayX = 4 N
//WayY = 10 E
//One right turn means we go to
//WayY = 4 E (prev way X)
//WayX = -10 S (prev way Y * -1)
//Another right should be
//Way Y = -10 W (prev way X)
//Way X = -4 S (prev way Y * -1)
//A third right should be
//Way Y = -4 W (prev way X)
//Way X = 10 N (prev way Y * -1)
//Fourth right (back to start)
//Way Y = 10 E (prev way X)
//Way X = 4 N (prev way Y * -1)
//Way X -> 4 -> -10 -> -4 -> 10 -> 4
//Way Y -> 10 -> 4 -> -10 -> -4 -> 10
}
return;
}
if (move.Direction == MoveDirection.Forward)
{
// Move towards the waypoint
xPos += waypointX * move.Amount;
yPos += waypointY * move.Amount;
return;
}
// Move the waypoint
switch (move.Direction)
{
case MoveDirection.North:
waypointX += move.Amount;
break;
case MoveDirection.South:
waypointX -= move.Amount;
break;
case MoveDirection.East:
waypointY += move.Amount;
break;
case MoveDirection.West:
waypointY -= move.Amount;
break;
default:
throw new InvalidOperationException($"Invalid move direction {move.Direction}.");
}
}
public void MoveShip(ShipMove move)
{
if (move.Direction == MoveDirection.Left ||
move.Direction == MoveDirection.Right)
{
var turnsToMake = move.Amount / 90;
int turnModifier;
if (move.Direction == MoveDirection.Left)
{
// 3 rights make a left
turnModifier = 3;
}
else
{
turnModifier = 1;
}
var currentFacingInt = (int)currentFacing;
currentFacingInt += turnsToMake * turnModifier;
currentFacingInt = Math.Abs(currentFacingInt);
Math.DivRem(currentFacingInt,
4,
out currentFacingInt);
currentFacing = (MoveDirection)currentFacingInt;
return;
}
var directionToMove = move.Direction;
if (directionToMove == MoveDirection.Forward)
{
directionToMove = currentFacing;
}
switch (directionToMove)
{
case MoveDirection.North:
xPos += move.Amount;
break;
case MoveDirection.South:
xPos -= move.Amount;
break;
case MoveDirection.East:
yPos += move.Amount;
break;
case MoveDirection.West:
yPos -= move.Amount;
break;
default:
throw new InvalidOperationException($"Invalid move direction {directionToMove}.");
}
}