public void PartitionAround(Rectangle boundingRect)
{
float startX = (float)boundingRect.Left / Map.MapWidth;
float startY = (float)boundingRect.Top / Map.MapHeight;
float endX = (float)boundingRect.Right/ Map.MapWidth;
float endY = (float)boundingRect.Bottom/ Map.MapHeight;
// Create partitions around the carved out space, and don't partition the carved out space further
// Here is how we create the partitions around the carved out space (marked with " XX "). The #s
// represent the splits...
// ________________________
// | |
// | |
// | |
// |____1_________________|
// | | | |
// | | XX 4 |
// | |____|___3____|
// | | |
// | 2 |
// | | |
// |________|_____________|
// Do first split (#1) horizontally along the top edge of the carved out space
this.SplitOrientation = Orientation.Vertical;
this.SplitLocation = startX;
if (startY == RegionEdges.Top)
LeftChild = null; // Carved out partition abuts the TopEdge, so no need to create a 'Left' part
else
{
LeftChild = new DungeonBSPNode(RegionEdges.Left, RegionEdges.Top, RegionEdges.Right, startY);
if (WeShouldSplit(startY - RegionEdges.Top))
LeftChild.Partition();
}
RightChild = new DungeonBSPNode(RegionEdges.Left, startY, RegionEdges.Right, RegionEdges.Bottom);
// Do second split (#2) vertically along the left edge of the carved out space
RightChild.SplitOrientation = Orientation.Horizontal;
RightChild.SplitLocation = startY;
if (startX == RegionEdges.Left)
RightChild.LeftChild = null; // Carved out partition abuts the LeftEdge, so no need to create a 'Left' part
else
{
RightChild.LeftChild = new DungeonBSPNode(RegionEdges.Left, startY, startX, RegionEdges.Bottom);
if (WeShouldSplit(startX - RegionEdges.Left))
RightChild.LeftChild.Partition();
}
RightChild.RightChild = new DungeonBSPNode(startX, startY, RegionEdges.Right, RegionEdges.Bottom);
// Do third split (#3) horizontally along the bottom edge of the carved out space
RightChild.RightChild.SplitOrientation = Orientation.Vertical;
RightChild.RightChild.SplitLocation = endY;
if (RegionEdges.Bottom == endY)
RightChild.RightChild.RightChild = null; // Carved out partition abuts the BottomEdge, so no need to create a 'Right' part
else
{
RightChild.RightChild.RightChild = new DungeonBSPNode(startX, endY, RegionEdges.Right, RegionEdges.Bottom);
if (WeShouldSplit(RegionEdges.Bottom - endY))
RightChild.RightChild.RightChild.Partition();
}
RightChild.RightChild.LeftChild = new DungeonBSPNode(startX, startY, RegionEdges.Right, endY);
// Do fourth split (#4) vertically along the right edge of the carved out space
RightChild.RightChild.LeftChild.SplitOrientation = Orientation.Horizontal;
RightChild.RightChild.LeftChild.SplitLocation = endX;
if (RegionEdges.Right == endX) // Carved out partition abuts the RightEdge, so no need to create a 'Right' part
RightChild.RightChild.LeftChild.RightChild = null;
else
{
RightChild.RightChild.LeftChild.RightChild = new DungeonBSPNode(endX, startY, RegionEdges.Right, endY);
if (WeShouldSplit(RegionEdges.Right - endX))
RightChild.RightChild.LeftChild.RightChild.Partition();
}
// Finally, partition the carved out space (and don't further partition it)
RightChild.RightChild.LeftChild.LeftChild = new DungeonBSPNode(startX, startY, endX, endY);
// Mark that the carved-out partition is pre-populated (don't add a room to it)
RightChild.RightChild.LeftChild.LeftChild.RoomBuilt = true;
RightChild.RightChild.LeftChild.LeftChild.BoundingRect = boundingRect;
}
private DungeonBSPNode PartitionDungeon()
{
// Initialize a few variables. These'll eventually be removed
DungeonBSPNode.Map = TargetMap;
// I eventually want to share the random # generator across all objects, so that all that's
// necessary to completely recreate a particular run is the initial Seed & the list of user inputs/
DungeonBSPNode.rand = TargetMap.rand;
// Create the root node; it covers the entire space (0.0,0.0) - (1.0,1.0)
DungeonBSPNode rootNode = new DungeonBSPNode(0.0f, 0.0f, 1.0f, 1.0f);
// Add Special Room before partitioning
/* if (false) // place special room
{
Room prefabRoom = Room.LoadRandom();
int xSpecialRoomStart = 20;
int ySpecialRoomStart = 20;
prefabRoom.BoundingRect = new Rectangle(prefabRoom.BoundingRect.Left + xSpecialRoomStart,
prefabRoom.BoundingRect.Top + ySpecialRoomStart,
prefabRoom.BoundingRect.Width, prefabRoom.BoundingRect.Height);
// Add the room to the Map.
TargetMap.PaintRoom(xSpecialRoomStart, ySpecialRoomStart, prefabRoom.RoomCells);
// Partition the remaining dungeon layer around the placed room
rootNode.PartitionAround(prefabRoom.BoundingRect);
}
else
{
*/ // No special room
rootNode.Partition();
// }
return rootNode;
}
/// <summary>
/// Partitions (splits) this node into two halves, and then creates child nodes for
/// each half and recursively partitions both of them (if they are not 'too small').
/// </summary>
public void Partition()
{
// Choose the axis along which we'll partition (split) this node. If this is a very
// narrow node in one axis, then favor the other axis in order to minimize long corridor-like rooms.
if (RegionEdges.Width / RegionEdges.Height > MaxPartitionSizeRatio)
SplitOrientation = Orientation.Horizontal;
else if (RegionEdges.Height / RegionEdges.Width > MaxPartitionSizeRatio)
SplitOrientation = Orientation.Vertical;
else
SplitOrientation = (rand.Next(2) == 1) ? Orientation.Horizontal : Orientation.Vertical;
// Split the Node.
if (SplitOrientation == Orientation.Horizontal)
{
// Pick the location along the XAxis (between the LeftEdge and RightEdge) at which we will split.
SplitLocation = RegionEdges.Left + HomogenizedRandomValue() * RegionEdges.Width;
// Create our two child nodes
LeftChild = new DungeonBSPNode(RegionEdges.Left, RegionEdges.Top, SplitLocation, RegionEdges.Bottom);
RightChild = new DungeonBSPNode(SplitLocation, RegionEdges.Top, RegionEdges.Right, RegionEdges.Bottom);
SetDebugNames();
// Partition child nodes if either is not yet too small
if (WeShouldSplit(SplitLocation - RegionEdges.Left))
LeftChild.Partition();
if (WeShouldSplit(RegionEdges.Right - SplitLocation))
RightChild.Partition();
}
else // Vertical split
{
// Pick the location along the YAxis (between the TopEdge and BottomEdge) at which we will split.
SplitLocation = RegionEdges.Top + HomogenizedRandomValue() * RegionEdges.Height;
// Create our two (Left = upper and Right = lower) child nodes
LeftChild = new DungeonBSPNode(RegionEdges.Left, RegionEdges.Top, RegionEdges.Right, SplitLocation);
RightChild = new DungeonBSPNode(RegionEdges.Left, SplitLocation, RegionEdges.Right, RegionEdges.Bottom);
SetDebugNames();
// Partition child nodes if either is not yet too small
if (WeShouldSplit(SplitLocation - RegionEdges.Top))
LeftChild.Partition();
if (WeShouldSplit(RegionEdges.Bottom - SplitLocation))
RightChild.Partition();
}
}
