private void DoPart1(string input)
{
var hexagonInstructions = ParseInput(input);
foreach (var hexagonInstruction in hexagonInstructions)
{
var coords = new HexagonCoordinate(0, 0);
foreach (var instruction in hexagonInstruction.Instructions)
{
switch (instruction)
{
case HexagonInstructionDirection.East:
coords.X += 2;
break;
case HexagonInstructionDirection.SouthEast:
coords.X++;
coords.Y--;
break;
case HexagonInstructionDirection.SouthWest:
coords.X--;
coords.Y--;
break;
case HexagonInstructionDirection.West:
coords.X -= 2;
break;
case HexagonInstructionDirection.NorthWest:
coords.X--;
coords.Y++;
break;
case HexagonInstructionDirection.NorthEast:
coords.X++;
coords.Y++;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
if (_hexagonCoords.ContainsKey(coords))
{
_hexagonCoords[coords] = !_hexagonCoords[coords];
}
else
{
_hexagonCoords.Add(coords, true);
}
}
}
private int GetNeighbouringBlackTiles(Dictionary <HexagonCoordinate, bool> hexCoords,
HexagonCoordinate coordinates)
{
var blackTilesFound = 0;
for (var j = 0; j < 6; j++)
{
var coordCheck = coordinates.GetCoordDiff(_directionsToCheck[j]);
if (hexCoords.ContainsKey(coordCheck))
{
blackTilesFound += hexCoords[coordCheck] ? 1 : 0;
}
}
return(blackTilesFound);
}
public HexagonCoordinate GetCoordDiff(HexagonCoordinate coords)
{
return(new HexagonCoordinate(X + coords.X, Y + coords.Y));
}
