private MapArea visit(Coord position)
{
// Don't bother allocating a MapArea, because the starting point isn't valid.
if (!Map[position])
{
return(null);
}
var stack = new Stack <Coord>();
var area = new MapArea();
stack.Push(position);
while (stack.Count != 0)
{
position = stack.Pop();
if (visited[position.X, position.Y] || !Map[position]) // Already visited, or not part of any mapArea
{
continue;
}
area.Add(position);
visited[position.X, position.Y] = true;
foreach (var c in AdjacencyMethod.Neighbors(position))
{
if (c.X < 0 || c.Y < 0 || c.X >= Map.Width || c.Y >= Map.Height) // Out of bounds, thus not actually a neighbor
{
continue;
}
if (Map[c] && !visited[c.X, c.Y])
{
stack.Push(c);
}
}
}
return(area);
}
/// <summary>
/// Gets a MapArea containing exactly those positions in both of the given MapAreas.
/// </summary>
/// <param name="area1">First MapArea.</param>
/// <param name="area2">Second MapArea.</param>
/// <returns>A MapArea containing exactly those positions in both of the given MapAreas.</returns>
public static MapArea GetIntersection(MapArea area1, MapArea area2)
{
var retVal = new MapArea();
if (!area1.Bounds.Intersects(area2.Bounds))
{
return(retVal);
}
if (area1.Count > area2.Count)
{
Utility.Swap(ref area1, ref area2);
}
foreach (var pos in area1.Positions)
{
if (area2.Contains(pos))
{
retVal.Add(pos);
}
}
return(retVal);
}
