/// <summary>
/// Somewhat optimized rectangle puller
/// Courtesy http://www.drdobbs.com/database/the-maximal-rectangle-problem/184410529
/// </summary>
/// <returns></returns>
public HashSet<BoundingBox> GetAllRectangles(HashSet<Location> locations, BoundingBox boundingBox)
{
//Console.WriteLine("Entering GetAllRectangles");
DateTime start = DateTime.Now;
HashSet<BoundingBox> result = new HashSet<BoundingBox>();
while (locations.Count > 0)
{
bool[,] boolArray = new bool[boundingBox.LowerRight.X + 1, boundingBox.LowerRight.Y + 1];
foreach (Location location in locations)
{
boolArray[location.Point.X, location.Point.Y] = true;
}
BoundingBox best = new BoundingBox();
for (int upperLeftX = BoundingBox.UpperLeft.X; upperLeftX < boundingBox.LowerRight.X + 1; upperLeftX++)
{
for (int upperLeftY = BoundingBox.UpperLeft.Y; upperLeftY < boundingBox.LowerRight.Y + 1; upperLeftY++)
{
if (!boolArray[upperLeftX, upperLeftY])
{
continue;
}
BoundingBox candidate = GrowOnes(new SxzPoint(upperLeftX, upperLeftY), boundingBox, boolArray);
if (candidate.Area() > best.Area())
{
best = candidate;
}
}
}
if (best.UpperLeft.X == -1)
{
break;
}
result.Add(best);
//Console.WriteLine("Have total rectangles " + result.Count);
//Console.WriteLine("Have remaining locations " + locations.Count);
foreach (Location location in new HashSet<Location>(locations))
{
if (best.Contains(location.Point.X, location.Point.Y))
{
locations.Remove(location);
}
}
}
//Console.WriteLine("Leaving GetAllRectangles with time " + (DateTime.Now - start).Milliseconds + " ms");
return result;
}
public HashSet<Location> GetUnmarkedByBoundingBox(BoundingBox boundingBox)
{
HashSet<Location> result = new HashSet<Location>();
foreach (Location location in Unmarked)
{
if (boundingBox.Contains(location.Point.X, location.Point.Y))
{
result.Add(location);
}
}
return result;
}
public bool IsRectangle(HashSet<Location> locations, BoundingBox boundingBox)
{
bool[,] boolArray = new bool[boundingBox.Width(), boundingBox.Height()];
foreach (Location location in locations)
{
if (boundingBox.Contains(location.Point.X, location.Point.Y))
{
boolArray[location.Point.X - boundingBox.UpperLeft.X, location.Point.Y - boundingBox.UpperLeft.Y] = true;
}
}
for (int x = 0; x < boolArray.GetLength(0); x++)
{
for (int y = 0; y < boolArray.GetLength(1); y++)
{
if (!boolArray[x, y])
{
return false;
}
}
}
return true;
}
