private async Task <int> Paint(SynchronousIntMachine intMachine, Dictionary <Point, int> canvas)
{
var paintedPositions = new HashSet <Point>();
var directions = new[] { new Point(-1, 0), new Point(0, 1), new Point(1, 0), new Point(0, -1) };
var direction = 0;
var pos = new Point(0, 0);
while (intMachine.RunUntilBlockOrComplete() != SynchronousIntMachine.ReturnCode.Completed)
{
if (IsUpdateProgressNeeded())
{
await UpdateProgressAsync();
}
var color = canvas.GetOrAdd(pos, _ => 0);
intMachine.InputQueue.Enqueue(color);
intMachine.RunUntilBlockOrComplete();
canvas[pos] = (int)intMachine.OutputQueue.Dequeue();
paintedPositions.Add(pos);
intMachine.RunUntilBlockOrComplete();
var directionDelta = (int)intMachine.OutputQueue.Dequeue() == 0 ? -1 : 1;
direction = (direction + directionDelta + 4) % 4;
pos += directions[direction];
}
return(paintedPositions.Count);
}
private static string Render(Dictionary <Point, int> canvas)
{
var whitePoints = canvas.Where(x => x.Value == 1).Select(x => x.Key).ToList();
var topLeft = new Point(whitePoints.Min(x => x.X), whitePoints.Min(x => x.Y));
var bottomRight = new Point(whitePoints.Max(x => x.X), whitePoints.Max(x => x.Y));
var resultSb = new StringBuilder();
for (var x = topLeft.X; x <= bottomRight.X; x++)
{
for (var y = topLeft.Y; y <= bottomRight.Y; y++)
{
if (canvas.TryGetValue(new Point(x, y), out var color))
{
resultSb.Append(color == 0 ? ' ' : '#');
}
else
{
resultSb.Append(' ');
}
}
resultSb.AppendLine();
}
return(resultSb.ToString());
}
