private int part1(string[] input)
{
ferry f = new ferry()
{
p = new Point(0, 0)
};
foreach (var instr in input)
{
switch (instr[0])
{
case 'N':
f.p = f.p.moveUp(Int32.Parse(instr.Substring(1))).Last();
break;
case 'S':
f.p = f.p.moveDown(Int32.Parse(instr.Substring(1))).Last();
break;
case 'E':
f.p = f.p.moveRight(Int32.Parse(instr.Substring(1))).Last();
break;
case 'W':
f.p = f.p.moveLeft(Int32.Parse(instr.Substring(1))).Last();
break;
case 'L':
var degrees = Int32.Parse(instr.Substring(1));
var ticks = degrees / 90;
switch (ticks)
{
case 1:
switch (f.direction)
{
case Direction.North:
f.direction = Direction.West;
break;
case Direction.East:
f.direction = Direction.North;
break;
case Direction.South:
f.direction = Direction.East;
break;
case Direction.West:
f.direction = Direction.South;
break;
default:
break;
}
break;
case 2:
switch (f.direction)
{
case Direction.North:
f.direction = Direction.South;
break;
case Direction.East:
f.direction = Direction.West;
break;
case Direction.South:
f.direction = Direction.North;
break;
case Direction.West:
f.direction = Direction.East;
break;
default:
break;
}
break;
case 3:
switch (f.direction)
{
case Direction.North:
f.direction = Direction.East;
break;
case Direction.East:
f.direction = Direction.South;
break;
case Direction.South:
f.direction = Direction.West;
break;
case Direction.West:
f.direction = Direction.North;
break;
default:
break;
}
break;
default:
break;
}
break;
case 'R':
degrees = Int32.Parse(instr.Substring(1));
ticks = degrees / 90;
switch (ticks)
{
case 1:
switch (f.direction)
{
case Direction.North:
f.direction = Direction.East;
break;
case Direction.East:
f.direction = Direction.South;
break;
case Direction.South:
f.direction = Direction.West;
break;
case Direction.West:
f.direction = Direction.North;
break;
default:
break;
}
break;
case 2:
switch (f.direction)
{
case Direction.North:
f.direction = Direction.South;
break;
case Direction.East:
f.direction = Direction.West;
break;
case Direction.South:
f.direction = Direction.North;
break;
case Direction.West:
f.direction = Direction.East;
break;
default:
break;
}
break;
case 3:
switch (f.direction)
{
case Direction.North:
f.direction = Direction.West;
break;
case Direction.East:
f.direction = Direction.North;
break;
case Direction.South:
f.direction = Direction.East;
break;
case Direction.West:
f.direction = Direction.South;
break;
default:
break;
}
break;
default:
break;
}
break;
case 'F':
switch (f.direction)
{
case Direction.North:
f.p = f.p.moveUp(Int32.Parse(instr.Substring(1))).Last();
break;
case Direction.East:
f.p = f.p.moveRight(Int32.Parse(instr.Substring(1))).Last();
break;
case Direction.South:
f.p = f.p.moveDown(Int32.Parse(instr.Substring(1))).Last();
break;
case Direction.West:
f.p = f.p.moveLeft(Int32.Parse(instr.Substring(1))).Last();
break;
default:
break;
}
break;
default:
break;
}
}
return(f.p.ManhDist());
}
private int part2(string[] input)
{
ferry f = new ferry()
{
p = new Point(0, 0)
};
Point waypoint = new Point(10, 1);
foreach (var instr in input)
{
switch (instr[0])
{
case 'N':
waypoint = waypoint.moveUp(Int32.Parse(instr.Substring(1))).Last();
break;
case 'S':
waypoint = waypoint.moveDown(Int32.Parse(instr.Substring(1))).Last();
break;
case 'E':
waypoint = waypoint.moveRight(Int32.Parse(instr.Substring(1))).Last();
break;
case 'W':
waypoint = waypoint.moveLeft(Int32.Parse(instr.Substring(1))).Last();
break;
case 'L':
var degrees = Int32.Parse(instr.Substring(1));
var ticks = degrees / 90;
for (int i = 0; i < ticks; i++)
{
//each step counter-clockwise chage X to -Y and Y to X
//e.g X = 4 Y = 10 ===> X= - 10 Y = 4
int oldWaypointX = waypoint.X;
int oldwaypointY = waypoint.Y;
waypoint = new Point(-oldwaypointY, oldWaypointX);
}
break;
case 'R':
degrees = Int32.Parse(instr.Substring(1));
ticks = degrees / 90;
for (int i = 0; i < ticks; i++)
{
//each step counter-clockwise chage X to Y and Y to -X
//e.g X = 4 Y = 10 ===> X = 10 Y = -4
int oldWaypointX = waypoint.X;
int oldwaypointY = waypoint.Y;
waypoint = new Point(oldwaypointY, -oldWaypointX);
}
break;
case 'F':
var times = Int32.Parse(instr.Substring(1));
var total_x = times * waypoint.X;
var total_y = times * waypoint.Y;
if (total_x > 0)
{
f.p = f.p.moveRight(total_x).Last();
}
else
{
f.p = f.p.moveLeft(-1 * total_x).Last();
}
if (total_y > 0)
{
f.p = f.p.moveUp(total_y).Last();
}
else
{
f.p = f.p.moveDown(-1 * total_y).Last();
}
break;
default:
break;
}
}
return(f.p.ManhDist());
}
