private static void FindMinMaxDistance(Point searcherPoint, SpatialTreeNode spatialTreeNode, out int minDistance, out int maxDistance)
{
// Find the possible minimum and maximum distances for this node as we only want to accrue sections that provide a minium range
if (spatialTreeNode.TopLeft.X <= searcherPoint.X &&
spatialTreeNode.BottomRight.X >= searcherPoint.X &&
spatialTreeNode.TopLeft.Y <= searcherPoint.Y &&
spatialTreeNode.BottomRight.Y >= searcherPoint.Y)
{
minDistance = 0;
int xDist = Math.Max((searcherPoint.X - spatialTreeNode.TopLeft.X), (spatialTreeNode.BottomRight.X - searcherPoint.X));
int yDist = Math.Max((searcherPoint.Y - spatialTreeNode.TopLeft.Y), (spatialTreeNode.BottomRight.Y - searcherPoint.Y));
maxDistance = xDist + yDist;
}
else if (spatialTreeNode.TopLeft.X <= searcherPoint.X &&
spatialTreeNode.BottomRight.X >= searcherPoint.X)
{
minDistance = Math.Min(Math.Abs(searcherPoint.Y - spatialTreeNode.TopLeft.Y), Math.Abs(spatialTreeNode.BottomRight.Y - searcherPoint.Y));
maxDistance = Math.Max(Math.Abs(searcherPoint.Y - spatialTreeNode.TopLeft.Y), Math.Abs(spatialTreeNode.BottomRight.Y - searcherPoint.Y));
}
else if (spatialTreeNode.TopLeft.Y <= searcherPoint.Y &&
spatialTreeNode.BottomRight.Y >= searcherPoint.Y)
{
minDistance = Math.Min(Math.Abs(searcherPoint.X - spatialTreeNode.TopLeft.X), Math.Abs(spatialTreeNode.BottomRight.X - searcherPoint.X));
maxDistance = Math.Max(Math.Abs(searcherPoint.X - spatialTreeNode.TopLeft.X), Math.Abs(spatialTreeNode.BottomRight.X - searcherPoint.X));
}
else
{
int maxXDist = Math.Max(Math.Abs(searcherPoint.X - spatialTreeNode.TopLeft.X), Math.Abs(spatialTreeNode.BottomRight.X - searcherPoint.X));
int maxYDist = Math.Max(Math.Abs(searcherPoint.Y - spatialTreeNode.TopLeft.Y), Math.Abs(spatialTreeNode.BottomRight.Y - searcherPoint.Y));
maxDistance = maxXDist + maxYDist;
int minXDist = Math.Min(Math.Abs(searcherPoint.X - spatialTreeNode.TopLeft.X), Math.Abs(spatialTreeNode.BottomRight.X - searcherPoint.X));
int minYDist = Math.Min(Math.Abs(searcherPoint.Y - spatialTreeNode.TopLeft.Y), Math.Abs(spatialTreeNode.BottomRight.Y - searcherPoint.Y));
minDistance = minXDist + minYDist;
}
}
public void Construct()
{
int treeWidth = _spatialTreeIndex.TreeWidth[Level];
int treeHeight = _spatialTreeIndex.TreeHeight[Level];
int subWidth = (int)Math.Ceiling(((BottomRight.X - TopLeft.X) + 1) / (double)treeWidth);
int newHeight = (int)Math.Ceiling(((BottomRight.Y - TopLeft.Y) + 1) / (double)treeHeight);
if (Level < MaxLevel)
{
Children = new List <SpatialTreeNode>();
for (int i = 0; i < treeWidth; i++)
{
for (int j = 0; j < treeHeight; j++)
{
Point newTopLeft = new Point(TopLeft.X + (subWidth * i), TopLeft.Y + (newHeight * j));
Point newBottomRight = new Point(Math.Min(newTopLeft.X + subWidth - 1, _spatialTreeIndex.WorldSize.X)
, Math.Min(newTopLeft.Y + newHeight - 1, _spatialTreeIndex.WorldSize.Y));
SpatialTreeNode addNode = new SpatialTreeNode(newTopLeft, newBottomRight, Level + 1, MaxLevel, this, _spatialTreeIndex);
Children.Add(addNode);
addNode.Construct();
}
}
}
if (IsLeafNode)
{
for (int i = TopLeft.X; i <= BottomRight.X; i++)
{
for (int j = TopLeft.Y; j <= BottomRight.Y; j++)
{
// Link this particular tile into this leaf node.
_spatialTreeIndex.GridToLeafNodes[i, j] = this;
}
}
}
}
private void Init(Point topLeft, Point bottomRight, int level, int maxLevel, SpatialTreeNode parent, SpatialTreeIndex spatialTreeIndex)
{
SpatialIndexMembers = new Dictionary <SpatialObjectKey, List <ISpatialIndexMember> >();
TopLeft = topLeft;
BottomRight = bottomRight;
Level = level;
MaxLevel = maxLevel;
_parent = parent;
_spatialTreeIndex = spatialTreeIndex;
}
public void CheckChangeSection(Point newPosition, ISpatialIndexMember objectToMove, SpatialObjectKey spatialObjectType)
{
SpatialTreeNode leafNodeToRemoveFrom = PositionToLeafNode(objectToMove.SpatialIndexPosition);
SpatialTreeNode leafNodeToAdd = PositionToLeafNode(newPosition);
if (leafNodeToRemoveFrom != leafNodeToAdd)
{
RemoveFromSection(objectToMove, spatialObjectType);
leafNodeToAdd.AddSpatialMemeber(spatialObjectType, objectToMove);
}
}
public void Initialise()
{
_topNode = new SpatialTreeNode(new Point(0, 0), new Point(WorldSize.X - 1, WorldSize.Y - 1), 0, TreeWidth.Length - 1, this);
GridToLeafNodes = new SpatialTreeNode[WorldSize.X, WorldSize.Y];
_topNode.Construct();
}
public void RemoveFromSection(ISpatialIndexMember objectToRemove, SpatialObjectKey spatialObjectType)
{
SpatialTreeNode leafNodeToRemoveFrom = PositionToLeafNode(objectToRemove.SpatialIndexPosition);
leafNodeToRemoveFrom.RemoveSpatialMemeber(spatialObjectType, objectToRemove);
}
public void AddToSection(ISpatialIndexMember objectToAdd, SpatialObjectKey spatialObjectType)
{
SpatialTreeNode leafNodeToAdd = PositionToLeafNode(objectToAdd.SpatialIndexPosition);
leafNodeToAdd.AddSpatialMemeber(spatialObjectType, objectToAdd);
}
private SpatialTreeNode(Point topLeft, Point bottomRight, int level, int maxLevel, SpatialTreeNode parent, SpatialTreeIndex spatialTreeIndex)
{
Init(topLeft, bottomRight, level, maxLevel, parent, spatialTreeIndex);
}
