public QuadTree( float MapWidth, float MapHeight, Vector2 CellSize, Heightmap.Tri[] Triangle ) {
this.CellSize = CellSize;
GridWidth = MapWidth / CellSize.X;
GridHeight = MapHeight / CellSize.Y;
int numberOfLeaves = ( (int)GridWidth / 4 ) * ( (int)GridHeight / 4 );
int numberOfNodes = CalcNodeNum( numberOfLeaves, 4 );
NodeList = new List<QuadNode>( numberOfNodes );
for( int i = 0; i < numberOfNodes; i++ ) {
NodeList.Add( null );
}
Vector3 A = Vector3.Zero;
Vector3 B = new Vector3( MapWidth, 0, 0 );
Vector3 C = new Vector3( 0, 0, MapHeight );
Vector3 D = new Vector3( MapWidth, 0, MapHeight );
BoundingCoordinates.LowerLeft = A;
BoundingCoordinates.LowerRight = B;
BoundingCoordinates.UpperLeft = C;
BoundingCoordinates.UpperRight = D;
boundingBox = new BoundingBox( new Vector3( BoundingCoordinates.LowerLeft.X, Editor.heightmap.lowestPoint, BoundingCoordinates.LowerLeft.Z ), new Vector3( BoundingCoordinates.UpperRight.X, Editor.heightmap.highestPoint, BoundingCoordinates.UpperRight.Z ) );
CreateNode( BoundingCoordinates, 0, 0, Triangle );
}
public void CreateNode( BoundingSquare Bounding, int ParentID, int NodeID, Heightmap.Tri[] Triangle ) {
NodeType nodeType;
float Width;
float Height;
Width = Bounding.UpperRight.X - Bounding.UpperLeft.X; //X
Height = Bounding.UpperLeft.Z - Bounding.LowerLeft.Z; //Z
if( Width / 2 == ( 2 * (int)CellSize.X ) ) {
nodeType = NodeType.Leaf;
} else {
nodeType = NodeType.Node;
}
QuadNode node = new QuadNode();
node.ID = NodeID;
node.ParentID = ParentID;
node.BoundingCoordinates.UpperLeft = Bounding.UpperLeft;
node.BoundingCoordinates.UpperRight = Bounding.UpperRight;
node.BoundingCoordinates.LowerLeft = Bounding.LowerLeft;
node.BoundingCoordinates.LowerRight = Bounding.LowerRight;
node.boundingBox = new BoundingBox( new Vector3( node.BoundingCoordinates.LowerLeft.X, Editor.heightmap.lowestPoint, node.BoundingCoordinates.LowerLeft.Z ), new Vector3( node.BoundingCoordinates.UpperRight.X, Editor.heightmap.highestPoint, node.BoundingCoordinates.UpperRight.Z ) );
node.Type = nodeType;
if( nodeType == NodeType.Leaf ) {
int tID;
int o = 0;
float lowestPoint = Editor.heightmap.maxHeight;
float highestPoint = 0f;
for( int y = (int)node.BoundingCoordinates.LowerLeft.Z / (int)CellSize.Y; y < ( ( node.BoundingCoordinates.UpperRight.Z / CellSize.Y ) - 0 ); y++ ) {
for( int x = (int)node.BoundingCoordinates.LowerLeft.X / (int)CellSize.X; x < ( ( node.BoundingCoordinates.UpperRight.X / CellSize.X ) - 0 ); x++ ) {
tID = ( x + y * ( Editor.heightmap.size.X - 1 ) ) * 2;
if( tID >= Triangle.Length - 0 ) {
o++;
}
if( tID < Triangle.Length ) {
node.TriangleIDs.Add( tID );
node.TriangleIDs.Add( tID + 1 );
if( Triangle[ tID ].p1.Y > highestPoint )
highestPoint = Triangle[ tID ].p1.Y;
if( Triangle[ tID ].p2.Y > highestPoint )
highestPoint = Triangle[ tID ].p2.Y;
if( Triangle[ tID ].p3.Y > highestPoint )
highestPoint = Triangle[ tID ].p3.Y;
if( Triangle[ tID ].p1.Y < lowestPoint )
lowestPoint = Triangle[ tID ].p1.Y;
if( Triangle[ tID ].p2.Y < lowestPoint )
lowestPoint = Triangle[ tID ].p2.Y;
if( Triangle[ tID ].p3.Y < lowestPoint )
lowestPoint = Triangle[ tID ].p3.Y;
if( Triangle[ tID + 1 ].p1.Y > highestPoint )
highestPoint = Triangle[ tID + 1 ].p1.Y;
if( Triangle[ tID + 1 ].p2.Y > highestPoint )
highestPoint = Triangle[ tID + 1 ].p2.Y;
if( Triangle[ tID + 1 ].p3.Y > highestPoint )
highestPoint = Triangle[ tID + 1 ].p3.Y;
if( Triangle[ tID + 1 ].p1.Y < lowestPoint )
lowestPoint = Triangle[ tID + 1 ].p1.Y;
if( Triangle[ tID + 1 ].p2.Y < lowestPoint )
lowestPoint = Triangle[ tID + 1 ].p2.Y;
if( Triangle[ tID + 1 ].p3.Y < lowestPoint )
lowestPoint = Triangle[ tID + 1 ].p3.Y;
}
}
//Determine the height of the bounding box for this Leaf Node
node.boundingBox.Min.Y = lowestPoint;
node.boundingBox.Max.Y = highestPoint;
}
} else {
BoundingSquare BoundingBox = new BoundingSquare();
TotalTreeID++;
node.Branches[ 0 ] = TotalTreeID;
//LowerLeft
BoundingBox.LowerLeft = Bounding.LowerLeft;
//LowerRight
BoundingBox.LowerRight = Bounding.LowerLeft + ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 );
//UpperLeft
BoundingBox.UpperLeft = Bounding.LowerLeft + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 );
//UpperRight
BoundingBox.UpperRight = Bounding.LowerLeft + ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 ) + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 );
CreateNode( BoundingBox, NodeID, TotalTreeID, Triangle );
//Determine the height of the bounding box for this Node
if( NodeList[ TotalTreeID ].boundingBox.Max.Y > node.boundingBox.Max.Y )
node.boundingBox.Max.Y = NodeList[ TotalTreeID ].boundingBox.Max.Y;
if( NodeList[ TotalTreeID ].boundingBox.Min.Y < node.boundingBox.Min.Y )
node.boundingBox.Min.Y = NodeList[ TotalTreeID ].boundingBox.Min.Y;
//**************************************************************************
TotalTreeID++;
node.Branches[ 1 ] = TotalTreeID;
//LowerLeft
BoundingBox.LowerLeft = Bounding.LowerLeft + ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 );
//LowerRight
BoundingBox.LowerRight = Bounding.LowerRight;
//UpperLeft
BoundingBox.UpperLeft = Bounding.LowerLeft + ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 ) + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 );
//UpperRight
BoundingBox.UpperRight = Bounding.LowerLeft + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 ) + ( ( Bounding.LowerRight - Bounding.LowerLeft ) );
CreateNode( BoundingBox, NodeID, TotalTreeID, Triangle );
//Determine the height of the bounding box for this Node
if( NodeList[ TotalTreeID ].boundingBox.Max.Y > node.boundingBox.Max.Y )
node.boundingBox.Max.Y = NodeList[ TotalTreeID ].boundingBox.Max.Y;
if( NodeList[ TotalTreeID ].boundingBox.Min.Y < node.boundingBox.Min.Y )
node.boundingBox.Min.Y = NodeList[ TotalTreeID ].boundingBox.Min.Y;
//**************************************************************************
TotalTreeID++;
node.Branches[ 2 ] = TotalTreeID;
//LowerLeft
BoundingBox.LowerLeft = Bounding.LowerLeft + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 );
//LowerRight
BoundingBox.LowerRight = Bounding.LowerLeft + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 )
+ ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 );
//UpperLeft
BoundingBox.UpperLeft = Bounding.UpperLeft;
//UpperRight
BoundingBox.UpperRight = Bounding.LowerLeft + ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 ) + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) );
CreateNode( BoundingBox, NodeID, TotalTreeID, Triangle );
//Determine the height of the bounding box for this Node
if( NodeList[ TotalTreeID ].boundingBox.Max.Y > node.boundingBox.Max.Y )
node.boundingBox.Max.Y = NodeList[ TotalTreeID ].boundingBox.Max.Y;
if( NodeList[ TotalTreeID ].boundingBox.Min.Y < node.boundingBox.Min.Y )
node.boundingBox.Min.Y = NodeList[ TotalTreeID ].boundingBox.Min.Y;
//**************************************************************************
TotalTreeID++;
node.Branches[ 3 ] = TotalTreeID;
//LowerLeft
BoundingBox.LowerLeft = Bounding.LowerLeft + ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 ) + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 );
//LowerRight
BoundingBox.LowerRight = Bounding.LowerLeft + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) / 2 ) + ( ( Bounding.LowerRight - Bounding.LowerLeft ) );
//UpperLeft
BoundingBox.UpperLeft = Bounding.LowerLeft + ( ( Bounding.LowerRight - Bounding.LowerLeft ) / 2 ) + ( ( Bounding.UpperLeft - Bounding.LowerLeft ) );
//UpperRight
BoundingBox.UpperRight = Bounding.UpperRight;
CreateNode( BoundingBox, NodeID, TotalTreeID, Triangle );
//Determine the height of the bounding box for this Node
if( NodeList[ TotalTreeID ].boundingBox.Max.Y > node.boundingBox.Max.Y )
node.boundingBox.Max.Y = NodeList[ TotalTreeID ].boundingBox.Max.Y;
if( NodeList[ TotalTreeID ].boundingBox.Min.Y < node.boundingBox.Min.Y )
node.boundingBox.Min.Y = NodeList[ TotalTreeID ].boundingBox.Min.Y;
}
NodeList[ NodeID ] = node;
//Determine the height of the bounding box for the QuadTree
if( node.boundingBox.Max.Y > boundingBox.Max.Y )
boundingBox.Max.Y = node.boundingBox.Max.Y;
if( node.boundingBox.Min.Y < boundingBox.Min.Y )
boundingBox.Min.Y = node.boundingBox.Min.Y;
return;
}
public bool InsideBoundingBox( Heightmap.Tri TestTriangle, BoundingSquare Box ) {
bool inside = false;
if( TestTriangle.p1.X >= Box.UpperLeft.X && TestTriangle.p1.X <= Box.UpperRight.X ) {
if( TestTriangle.p1.Z >= Box.LowerLeft.Z && TestTriangle.p1.X <= Box.UpperLeft.Z ) {
inside = true;
}
}
if( TestTriangle.p2.X >= Box.UpperLeft.X && TestTriangle.p2.X <= Box.UpperRight.X ) {
if( TestTriangle.p2.Z >= Box.LowerLeft.Z && TestTriangle.p2.X <= Box.UpperLeft.Z ) {
inside = true;
}
}
if( TestTriangle.p3.X >= Box.UpperLeft.X && TestTriangle.p3.X <= Box.UpperRight.X ) {
if( TestTriangle.p3.Z >= Box.LowerLeft.Z && TestTriangle.p3.X <= Box.UpperLeft.Z ) {
inside = true;
}
}
return inside;
}
public PaintTools( Heightmap myHeightmap ) {
heightmap = myHeightmap;
InitializeComponent();
}
