QuadTree2 Init()
{
bInit = true;
int num_of_cubes = 0;
// P - a point in the scene that also needs to be treated like a 'Cube' obstacle
B[num_of_cubes++] = new Bounds(pointer.transform.position, Vector3.zero);
foreach (GameObject go in GameObject.FindObjectsOfType(typeof(GameObject)))
{
if (go.name == "Cube")
{
if (Mathf.Abs(go.transform.rotation.z) >= 0.001f)
{
// the 'ramp' cube is the only special one to...
B [num_of_cubes] = new Bounds(go.collider.bounds.center, go.collider.bounds.size);
B [num_of_cubes].SetMinMax(new Vector3((B [num_of_cubes].min.x + B [num_of_cubes].max.x) / 2.0f, B [num_of_cubes].min.y, B [num_of_cubes].min.z),
new Vector3(B [num_of_cubes].max.x, B [num_of_cubes].max.y, B [num_of_cubes].max.z));
num_of_cubes++;
}
else
{
B [num_of_cubes++] = new Bounds(go.collider.bounds.center, go.collider.bounds.size);
}
}
}
return(QuadTree2.Init(B, transform.position.y));
}
void calculateCosts(QuadTree2 tree)
{
if (tree.a == null && tree.b == null && tree.c == null && tree.d == null)
{
Vector2 start = new Vector2(pointer.transform.position.x, pointer.transform.position.z);
Vector2 treeCenter = new Vector2(tree.minx + (tree.maxx - tree.minx) / 2, tree.minz + (tree.maxz - tree.minz) / 2);
tree.cost = Vector2.Distance(treeCenter, start);
}
else
{
if (tree.a != null)
{
calculateCosts(tree.a);
}
if (tree.b != null)
{
calculateCosts(tree.b);
}
if (tree.c != null)
{
calculateCosts(tree.c);
}
if (tree.d != null)
{
calculateCosts(tree.d);
}
}
}
List <QuadTree2> getPath()
{
Vector2 start = new Vector2(pointer.transform.position.x, pointer.transform.position.z);
Vector2 goalPosition = new Vector2(goal.transform.position.x, goal.transform.position.z);
float a = 0.0f, b = 0.0f, c = 0.0f, d = 0.0f;
QuadTree2 startQuad = QuadTree2.refTree.Find(start.x, start.y, ref a, ref b, ref c, ref d);
QuadTree2 currentQuad = QuadTree2.refTree.Find(goalPosition.x, goalPosition.y, ref a, ref b, ref c, ref d);
List <QuadTree2> pathToReturn = new List <QuadTree2>();
while (currentQuad != startQuad)
{
List <QuadTree2> neighbors = QuadTree2.findNeighborsToQuad(currentQuad);
QuadTree2 predecessor = null;
foreach (QuadTree2 neighbor in neighbors)
{
if (predecessor == null)
{
predecessor = neighbor;
}
else
{
if (neighbor.cost < predecessor.cost && !containsObstacle(neighbor))
{
predecessor = neighbor;
}
}
}
pathToReturn.Add(currentQuad);
currentQuad = predecessor;
}
pathToReturn.Add(currentQuad);
return(pathToReturn);
}
static public void CopyTree(ref QuadTree2 fromTree, ref QuadTree2 toTree)
{
if (fromTree == null)
{
toTree = null;
return;
}
toTree = new QuadTree2();
toTree.dirty = fromTree.dirty;
toTree.level = fromTree.level;
toTree.maxx = fromTree.maxx;
toTree.maxz = fromTree.maxz;
toTree.minx = fromTree.minx;
toTree.minz = fromTree.minz;
toTree.cost = fromTree.cost;
if (fromTree.a != null)
{
CopyTree(ref fromTree.a, ref toTree.a);
}
if (fromTree.b != null)
{
CopyTree(ref fromTree.b, ref toTree.b);
}
if (fromTree.c != null)
{
CopyTree(ref fromTree.c, ref toTree.c);
}
if (fromTree.d != null)
{
CopyTree(ref fromTree.d, ref toTree.d);
}
}
public QuadTree2(float _minx, float _maxx, float _minz, float _maxz, int _level, QuadTree2 _parent)
{
minx = _minx;
maxx = _maxx;
minz = _minz;
maxz = _maxz;
level = _level;
parent = _parent;
}
bool containsObstacle(QuadTree2 tree)
{
foreach(GameObject obstacle in GameObject.FindGameObjectsWithTag("movable obstacles"))
{
Vector3 obstaclePosition = obstacle.transform.position;
if(obstaclePosition.x >= tree.minx && obstaclePosition.x <= tree.maxx
&& obstaclePosition.z >= tree.minz && obstaclePosition.z <= tree.maxz)
return true;
}
return false;
}
void calculateCosts(QuadTree2 tree)
{
if (tree.a == null && tree.b == null && tree.c == null && tree.d == null) {
Vector2 start = new Vector2(pointer.transform.position.x, pointer.transform.position.z);
Vector2 treeCenter = new Vector2(tree.minx+(tree.maxx - tree.minx)/2, tree.minz+(tree.maxz - tree.minz)/2);
tree.cost = Vector2.Distance(treeCenter, start);
} else {
if (tree.a != null) calculateCosts(tree.a);
if (tree.b != null) calculateCosts(tree.b);
if (tree.c != null) calculateCosts(tree.c);
if (tree.d != null) calculateCosts(tree.d);
}
}
bool containsObstacle(QuadTree2 tree)
{
foreach (GameObject obstacle in GameObject.FindGameObjectsWithTag("movable obstacles"))
{
Vector3 obstaclePosition = obstacle.transform.position;
if (obstaclePosition.x >= tree.minx && obstaclePosition.x <= tree.maxx &&
obstaclePosition.z >= tree.minz && obstaclePosition.z <= tree.maxz)
{
return(true);
}
}
return(false);
}
QuadStruct structFromQuadTree(QuadTree2 quad)
{
QuadStruct st = new QuadStruct();
st.level = quad.level;
st.maxx = quad.maxx; st.minx = quad.minx;
st.maxz = quad.maxz; st.minz = quad.minz;
st.NE = -1; st.NW = -1; st.SE = -1; st.SW = -1;
st.distance = -1;
st.index = -1;
st.parent = -1;
return(st);
}
static public QuadTree2 Init(Bounds[] b, float y)
{
B = b;
horizontal_y = y;
num_of_cubes = b.Length;
refTree = new QuadTree2(rminx, rmaxx, rminz, rmaxz, 0, null);
Construct(refTree);
QuadTree2 root = null;
CopyTree(ref refTree, ref root);
return(root);
}
void populateStructList(QuadTree2 root)
{
Queue <QuadTree2> structQueue = new Queue <QuadTree2>();
structQueue.Enqueue(root);
int count = 0;
while (structQueue.Count > 0)
{
QuadTree2 quad = structQueue.Dequeue();
count++;
if (quad == root)
{
count = 0;
}
quad.st = structFromQuadTree(quad);
quad.st.index = currentIndex++;
if (quad.parent != null)
{
quad.st.parent = quad.parent.st.index;
if (count == 4)
{
int parentIndex = quad.parent.st.index;
QuadStruct parentStruct = structList[parentIndex];
parentStruct.NE = quad.parent.a.st.index;
parentStruct.NW = quad.parent.b.st.index;
parentStruct.SE = quad.parent.c.st.index;
parentStruct.SW = quad.parent.d.st.index;
structList[parentIndex] = parentStruct;
count = 0;
}
}
structList.Add(quad.st);
if (quad.a != null)
{
List <QuadTree2> children = new List <QuadTree2>();
children.Add(quad.a); children.Add(quad.b);
children.Add(quad.c); children.Add(quad.d);
foreach (QuadTree2 child in children)
{
structQueue.Enqueue(child);
}
}
}
}
void OnDrawGizmos()
{
if (!bInit)
{
QuadTree2 tree = Init();
}
QuadTree2.DrawTree();
Gizmos.color = Color.black;
if (path != null && path.Count > 0)
{
foreach (QuadTree2 tree in path)
{
Vector3 center = new Vector3(tree.minx + (tree.maxx - tree.minx) / 2, 1.5f, tree.minz + (tree.maxz - tree.minz) / 2);
Gizmos.DrawSphere(center, 0.25f);
}
}
}
// To find the quad-tree grid which encloses the point(xx, zz)
public QuadTree2 Find(float xx, float zz, ref float tminx, ref float tmaxx, ref float tminz, ref float tmaxz)
{
if (xx >= minx && xx < maxx && zz >= minz && zz < maxz && a == null)
{
tminx = minx;
tmaxx = maxx;
tminz = minz;
tmaxz = maxz;
return(this);
}
else if (a != null)
{
QuadTree2 retval = null;
retval = a.Find(xx, zz, ref tminx, ref tmaxx, ref tminz, ref tmaxz);
if (retval != null)
{
return(retval);
}
retval = b.Find(xx, zz, ref tminx, ref tmaxx, ref tminz, ref tmaxz);
if (retval != null)
{
return(retval);
}
retval = c.Find(xx, zz, ref tminx, ref tmaxx, ref tminz, ref tmaxz);
if (retval != null)
{
return(retval);
}
retval = d.Find(xx, zz, ref tminx, ref tmaxx, ref tminz, ref tmaxz);
if (retval != null)
{
return(retval);
}
}
return(null);
}
static private List <QuadTree2> returnAllQuadsForNeighbor(QuadTree2 neighbor, QuadTree2 currentQuad, int axis)
{
List <QuadTree2> neighborQuads = new List <QuadTree2>();
int levelDifference = neighbor.level - currentQuad.level;
int numberOfQuads = (int)Mathf.Pow(2.0f, (float)levelDifference);
float min, max, offset;
float a = 0.0f, b = 0.0f, c = 0.0f, d = 0.0f;
QuadTree2 nextNeighbor;
if (axis == 1)
{
min = currentQuad.minz;
max = currentQuad.maxz;
offset = (max - min) / numberOfQuads;
}
else
{
min = currentQuad.minx;
max = currentQuad.maxx;
offset = (max - min) / numberOfQuads;
}
for (int index = 0; index < numberOfQuads; ++index)
{
float testPoint = min + (index * offset + 0.5f);
if (axis == 0)
{
nextNeighbor = refTree.Find(testPoint, neighbor.minz + 0.5f, ref a, ref b, ref c, ref d);
}
else
{
nextNeighbor = refTree.Find(neighbor.minx + 0.5f, testPoint, ref a, ref b, ref c, ref d);
}
neighborQuads.Add(nextNeighbor);
}
return(neighborQuads);
}
// Draw tree using Gizmos utility
static private void DrawTree(QuadTree2 tree)
{
if (tree == null)
{
return;
}
float y = horizontal_y + 2.0f;
Gizmos.color = Color.grey;
Gizmos.DrawLine(new Vector3(tree.minx, y, tree.minz), new Vector3(tree.minx, y, tree.maxz));
Gizmos.DrawLine(new Vector3(tree.minx, y, tree.minz), new Vector3(tree.maxx, y, tree.minz));
Gizmos.DrawLine(new Vector3(tree.maxx, y, tree.maxz), new Vector3(tree.maxx, y, tree.minz));
Gizmos.DrawLine(new Vector3(tree.maxx, y, tree.maxz), new Vector3(tree.minx, y, tree.maxz));
if (tree.a != null)
{
DrawTree(tree.a);
}
if (tree.b != null)
{
DrawTree(tree.b);
}
if (tree.c != null)
{
DrawTree(tree.c);
}
if (tree.d != null)
{
DrawTree(tree.d);
}
}
void populateStructList(QuadTree2 root)
{
Queue<QuadTree2> structQueue = new Queue<QuadTree2>();
structQueue.Enqueue(root);
int count = 0;
while (structQueue.Count > 0) {
QuadTree2 quad = structQueue.Dequeue();
count++;
if (quad == root) count = 0;
quad.st = structFromQuadTree(quad);
quad.st.index = currentIndex++;
if (quad.parent != null) {
quad.st.parent = quad.parent.st.index;
if (count == 4) {
int parentIndex = quad.parent.st.index;
QuadStruct parentStruct = structList[parentIndex];
parentStruct.NE = quad.parent.a.st.index;
parentStruct.NW = quad.parent.b.st.index;
parentStruct.SE = quad.parent.c.st.index;
parentStruct.SW = quad.parent.d.st.index;
structList[parentIndex] = parentStruct;
count = 0;
}
}
structList.Add(quad.st);
if (quad.a != null) {
List<QuadTree2> children = new List<QuadTree2>();
children.Add(quad.a); children.Add(quad.b);
children.Add(quad.c); children.Add(quad.d);
foreach(QuadTree2 child in children) {
structQueue.Enqueue(child);
}
}
}
}
public QuadTree2(float _minx, float _maxx, float _minz, float _maxz, int _level, QuadTree2 _parent)
{
minx = _minx;
maxx = _maxx;
minz = _minz;
maxz = _maxz;
level = _level;
parent = _parent;
}
public static void Construct(QuadTree2 tree)
{
if (tree == null)
return;
//print (tree.level);
int count = 0;
bool flag = false;
for (int i = 0; i < num_of_cubes; i++)
{
Bounds treeBound = new Bounds(new Vector3((tree.minx + tree.maxx) / 2.0f, horizontal_y, (tree.minz + tree.maxz) / 2.0f),
new Vector3(tree.maxx - tree.minx, 5.0f, tree.maxz - tree.minz));
if (i == 0 && Contain(treeBound, B[i]))
{
tree.containsObstacle = true;
count++;
//break;
}
else if (!Contain(B[i], treeBound) && B[i].Intersects(treeBound))
{
flag = true;
tree.containsObstacle = true;
count++;
//break;
}
}
float half_x = (tree.maxx - tree.minx) / 2.0f;
float half_z = (tree.maxz - tree.minz) / 2.0f;
if (tree.level >= QuadTree2.NUM_MAX_LEVEL)
{
tree.tag = true;
return;
}
int grid_size_x = (int)(tree.maxx - tree.minx);
if (count >= 1)
{
// branch node
bool is_child_leave_node = false;
if (grid_size_x <= 2)
is_child_leave_node = true;
tree.a = new QuadTree2(tree.minx, tree.minx + half_x, tree.minz, tree.minz + half_z, tree.level+1, tree);
if (is_child_leave_node) {
// leave node
tree.a.tag = flag;
}
else {
Construct(tree.a);
}
tree.b = new QuadTree2(tree.minx, tree.minx + half_x, tree.minz + half_z, tree.maxz, tree.level+1, tree);
if (is_child_leave_node) {
// leave node
tree.b.tag = flag;
}
else {
Construct(tree.b);
}
tree.c = new QuadTree2(tree.minx + half_x, tree.maxx, tree.minz + half_z, tree.maxz, tree.level+1, tree);
if (is_child_leave_node) {
// leave node
tree.c.tag = flag;
}
else {
Construct(tree.c);
}
tree.d = new QuadTree2(tree.minx + half_x, tree.maxx, tree.minz, tree.minz + half_z, tree.level+1, tree);
if (is_child_leave_node) {
// leave node
tree.d.tag = flag;
}
else {
Construct(tree.d);
}
}
else if (count == 0)
{
// leave node
tree.tag = true;
}
}
public static void CopyTree(ref QuadTree2 fromTree, ref QuadTree2 toTree)
{
if (fromTree == null) {
toTree = null;
return;
}
toTree = new QuadTree2();
toTree.dirty = fromTree.dirty;
toTree.level = fromTree.level;
toTree.maxx = fromTree.maxx;
toTree.maxz = fromTree.maxz;
toTree.minx = fromTree.minx;
toTree.minz = fromTree.minz;
toTree.cost = fromTree.cost;
if (fromTree.a != null) CopyTree(ref fromTree.a, ref toTree.a);
if (fromTree.b != null) CopyTree(ref fromTree.b, ref toTree.b);
if (fromTree.c != null) CopyTree(ref fromTree.c, ref toTree.c);
if (fromTree.d != null) CopyTree(ref fromTree.d, ref toTree.d);
}
public static List<QuadTree2> findNeighborsToQuad(QuadTree2 quad)
{
List<QuadTree2> neighbors = new List<QuadTree2>();
if (quad.level == 0)
return neighbors;
float a = 0.0f, b = 0.0f, c = 0.0f, d = 0.0f;
QuadTree2 north = QuadTree2.refTree.Find(quad.minx + 0.5f, quad.maxz + 0.5f, ref a, ref b, ref c, ref d);
if (north != null && north.level > quad.level) {
foreach(QuadTree2 subtree in returnAllQuadsForNeighbor(north, quad, 0))
{
neighbors.Add(subtree);
}
} else {
neighbors.Add(north);
}
QuadTree2 south = QuadTree2.refTree.Find(quad.minx + 0.5f, quad.minz - 0.5f, ref a, ref b, ref c, ref d);
if (south != null && south.level > quad.level) {
foreach (QuadTree2 subtree in returnAllQuadsForNeighbor(south, quad, 0))
{
neighbors.Add(subtree);
}
} else {
neighbors.Add(south);
}
QuadTree2 east = QuadTree2.refTree.Find(quad.maxx + 0.5f, quad.minz + 0.5f, ref a, ref b, ref c, ref d);
if (east != null && east.level > quad.level) {
foreach(QuadTree2 subtree in returnAllQuadsForNeighbor(east, quad, 1))
{
neighbors.Add(subtree);
}
} else {
neighbors.Add(east);
}
QuadTree2 west = QuadTree2.refTree.Find(quad.minx - 0.5f, quad.minz + 0.5f, ref a, ref b, ref c, ref d);
if (west!= null && west.level > quad.level) {
foreach(QuadTree2 subtree in returnAllQuadsForNeighbor(west, quad, 1))
{
neighbors.Add(subtree);
}
} else {
neighbors.Add(west);
}
QuadTree2 northWest = QuadTree2.refTree.Find(quad.minx - 0.5f, quad.maxz + 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(northWest);
QuadTree2 southWest = QuadTree2.refTree.Find(quad.minx - 0.5f, quad.minz - 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(southWest);
QuadTree2 northEast = QuadTree2.refTree.Find(quad.maxx + 0.5f, quad.maxz + 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(northEast);
QuadTree2 southEast = QuadTree2.refTree.Find(quad.maxx + 0.5f, quad.minz - 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(southEast);
return neighbors;
}
public static QuadTree2 Init(Bounds[] b, float y)
{
B = b;
horizontal_y = y;
num_of_cubes = b.Length;
refTree = new QuadTree2(rminx, rmaxx, rminz, rmaxz, 0, null);
Construct(refTree);
QuadTree2 root = null;
CopyTree(ref refTree, ref root);
return root;
}
void LocalUpdate(Vector3 oldPos, Vector3 newPos)
{
if (QuadTree2.refTree == null)
{
bInit = false;
}
else
{
float tminx1 = 0.0f;
float tmaxx1 = 0.0f;
float tminz1 = 0.0f;
float tmaxz1 = 0.0f;
QuadTree2 t1 = QuadTree2.refTree.Find(oldPos.x, oldPos.z, ref tminx1, ref tmaxx1, ref tminz1, ref tmaxz1);
float tminx2 = 0.0f;
float tmaxx2 = 0.0f;
float tminz2 = 0.0f;
float tmaxz2 = 0.0f;
QuadTree2 t2 = QuadTree2.refTree.Find(newPos.x, newPos.z, ref tminx2, ref tmaxx2, ref tminz2, ref tmaxz2);
if (!t1.Equals(t2) && t1.parent != t2.parent)
{
QuadTree2 parentTree = t1.RecoverTree();
if (parentTree != null)
{
bool flag2 = true;
if (parentTree.minx <= t2.minx &&
parentTree.maxx >= t2.maxx &&
parentTree.minz <= t2.minz &&
parentTree.maxz >= t2.maxz)
{
flag2 = false;
}
if (flag2)
{
if (tmaxx2 == tminx1)
{
// t2 is a neighbor to the left of t1
//print ("t2 is a neighbor to the left of t1");
t2.BuildTree(newPos);
}
else if (tminx2 == tmaxx1)
{
// t2 is a neighbor to the right of t1
//print ("t2 is a neighbor to the right of t1");
t2.BuildTree(newPos);
}
else if (tminz2 == tmaxz1)
{
//t2 is a neighbor on top of t1
//print ("t2 is a neighbor on top of t1");
t2.BuildTree(newPos);
}
else if (tmaxz2 == tminz1)
{
//t2 is a neighbor below t1
//print ("t2 is a neighbor below t1");
t2.BuildTree(newPos);
}
else
{
// not a neighbor
bInit = false;
}
}
else
{
parentTree.BuildTree(newPos);
}
}
else
{
bInit = false;
}
}
else
{
// they are the same quad-tree node
}
P = new Vector3(newPos.x, newPos.y, newPos.z);
}
}
// Draw tree using Gizmos utility
private static void DrawTree(QuadTree2 tree)
{
if (tree == null)
return;
float y = horizontal_y + 2.0f;
Gizmos.color = Color.grey;
Gizmos.DrawLine(new Vector3(tree.minx, y, tree.minz), new Vector3(tree.minx, y, tree.maxz));
Gizmos.DrawLine(new Vector3(tree.minx, y, tree.minz), new Vector3(tree.maxx, y, tree.minz));
Gizmos.DrawLine(new Vector3(tree.maxx, y, tree.maxz), new Vector3(tree.maxx, y, tree.minz));
Gizmos.DrawLine(new Vector3(tree.maxx, y, tree.maxz), new Vector3(tree.minx, y, tree.maxz));
if (tree.a != null)
DrawTree(tree.a);
if (tree.b != null)
DrawTree(tree.b);
if (tree.c != null)
DrawTree(tree.c);
if (tree.d != null)
DrawTree(tree.d);
}
private static List<QuadTree2> returnAllQuadsForNeighbor(QuadTree2 neighbor, QuadTree2 currentQuad, int axis)
{
List<QuadTree2> neighborQuads = new List<QuadTree2>();
int levelDifference = neighbor.level - currentQuad.level;
int numberOfQuads = (int)Mathf.Pow(2.0f, (float)levelDifference);
float min, max, offset;
float a = 0.0f, b = 0.0f, c = 0.0f, d = 0.0f;
QuadTree2 nextNeighbor;
if (axis == 1) {
min = currentQuad.minz;
max = currentQuad.maxz;
offset = (max - min)/numberOfQuads;
} else {
min = currentQuad.minx;
max = currentQuad.maxx;
offset = (max - min)/numberOfQuads;
}
for(int index = 0; index < numberOfQuads; ++index){
float testPoint = min+(index*offset+0.5f);
if (axis == 0) {
nextNeighbor = refTree.Find(testPoint, neighbor.minz+0.5f, ref a, ref b, ref c, ref d);
} else {
nextNeighbor = refTree.Find(neighbor.minx+0.5f, testPoint, ref a, ref b, ref c, ref d);
}
neighborQuads.Add(nextNeighbor);
}
return neighborQuads;
}
static public List <QuadTree2> findNeighborsToQuad(QuadTree2 quad)
{
List <QuadTree2> neighbors = new List <QuadTree2>();
if (quad.level == 0)
{
return(neighbors);
}
float a = 0.0f, b = 0.0f, c = 0.0f, d = 0.0f;
QuadTree2 north = QuadTree2.refTree.Find(quad.minx + 0.5f, quad.maxz + 0.5f, ref a, ref b, ref c, ref d);
if (north != null && north.level > quad.level)
{
foreach (QuadTree2 subtree in returnAllQuadsForNeighbor(north, quad, 0))
{
neighbors.Add(subtree);
}
}
else
{
neighbors.Add(north);
}
QuadTree2 south = QuadTree2.refTree.Find(quad.minx + 0.5f, quad.minz - 0.5f, ref a, ref b, ref c, ref d);
if (south != null && south.level > quad.level)
{
foreach (QuadTree2 subtree in returnAllQuadsForNeighbor(south, quad, 0))
{
neighbors.Add(subtree);
}
}
else
{
neighbors.Add(south);
}
QuadTree2 east = QuadTree2.refTree.Find(quad.maxx + 0.5f, quad.minz + 0.5f, ref a, ref b, ref c, ref d);
if (east != null && east.level > quad.level)
{
foreach (QuadTree2 subtree in returnAllQuadsForNeighbor(east, quad, 1))
{
neighbors.Add(subtree);
}
}
else
{
neighbors.Add(east);
}
QuadTree2 west = QuadTree2.refTree.Find(quad.minx - 0.5f, quad.minz + 0.5f, ref a, ref b, ref c, ref d);
if (west != null && west.level > quad.level)
{
foreach (QuadTree2 subtree in returnAllQuadsForNeighbor(west, quad, 1))
{
neighbors.Add(subtree);
}
}
else
{
neighbors.Add(west);
}
QuadTree2 northWest = QuadTree2.refTree.Find(quad.minx - 0.5f, quad.maxz + 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(northWest);
QuadTree2 southWest = QuadTree2.refTree.Find(quad.minx - 0.5f, quad.minz - 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(southWest);
QuadTree2 northEast = QuadTree2.refTree.Find(quad.maxx + 0.5f, quad.maxz + 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(northEast);
QuadTree2 southEast = QuadTree2.refTree.Find(quad.maxx + 0.5f, quad.minz - 0.5f, ref a, ref b, ref c, ref d);
neighbors.Add(southEast);
return(neighbors);
}
QuadStruct structFromQuadTree(QuadTree2 quad)
{
QuadStruct st = new QuadStruct();
st.level = quad.level;
st.maxx = quad.maxx; st.minx = quad.minx;
st.maxz = quad.maxz; st.minz = quad.minz;
st.NE = -1; st.NW = -1; st.SE = -1; st.SW = -1;
st.distance = -1;
st.index = -1;
st.parent = -1;
return st;
}
static public void Construct(QuadTree2 tree)
{
if (tree == null)
{
return;
}
//print (tree.level);
int count = 0;
bool flag = false;
for (int i = 0; i < num_of_cubes; i++)
{
Bounds treeBound = new Bounds(new Vector3((tree.minx + tree.maxx) / 2.0f, horizontal_y, (tree.minz + tree.maxz) / 2.0f),
new Vector3(tree.maxx - tree.minx, 5.0f, tree.maxz - tree.minz));
if (i == 0 && Contain(treeBound, B[i]))
{
tree.containsObstacle = true;
count++;
//break;
}
else if (!Contain(B[i], treeBound) && B[i].Intersects(treeBound))
{
flag = true;
tree.containsObstacle = true;
count++;
//break;
}
}
float half_x = (tree.maxx - tree.minx) / 2.0f;
float half_z = (tree.maxz - tree.minz) / 2.0f;
if (tree.level >= QuadTree2.NUM_MAX_LEVEL)
{
tree.tag = true;
return;
}
int grid_size_x = (int)(tree.maxx - tree.minx);
if (count >= 1)
{
// branch node
bool is_child_leave_node = false;
if (grid_size_x <= 2)
{
is_child_leave_node = true;
}
tree.a = new QuadTree2(tree.minx, tree.minx + half_x, tree.minz, tree.minz + half_z, tree.level + 1, tree);
if (is_child_leave_node)
{
// leave node
tree.a.tag = flag;
}
else
{
Construct(tree.a);
}
tree.b = new QuadTree2(tree.minx, tree.minx + half_x, tree.minz + half_z, tree.maxz, tree.level + 1, tree);
if (is_child_leave_node)
{
// leave node
tree.b.tag = flag;
}
else
{
Construct(tree.b);
}
tree.c = new QuadTree2(tree.minx + half_x, tree.maxx, tree.minz + half_z, tree.maxz, tree.level + 1, tree);
if (is_child_leave_node)
{
// leave node
tree.c.tag = flag;
}
else
{
Construct(tree.c);
}
tree.d = new QuadTree2(tree.minx + half_x, tree.maxx, tree.minz, tree.minz + half_z, tree.level + 1, tree);
if (is_child_leave_node)
{
// leave node
tree.d.tag = flag;
}
else
{
Construct(tree.d);
}
}
else if (count == 0)
{
// leave node
tree.tag = true;
}
}
public void BuildTree(Vector3 pt)
{
QuadTree2 tree = this;
float half_x = (tree.maxx - tree.minx) / 2.0f;
float half_z = (tree.maxz - tree.minz) / 2.0f;
if (tree == null || tree.level >= QuadTree2.NUM_MAX_LEVEL)
{
return;
}
Bounds treeBound = new Bounds(new Vector3((tree.minx + tree.maxx) / 2.0f, horizontal_y, (tree.minz + tree.maxz) / 2.0f),
new Vector3(tree.maxx - tree.minx, 5.0f, tree.maxz - tree.minz));
pt.y = horizontal_y;
Bounds bs = new Bounds(pt, Vector3.zero);
int count = 0;
if (Contain(treeBound, bs))
{
count = 1;
}
int grid_size_x = (int)(tree.maxx - tree.minx);
if (count >= 1 && grid_size_x >= 2)
{
// branch node
bool is_child_leave_node = false;
if (grid_size_x <= 2)
{
is_child_leave_node = true;
}
tree.a = new QuadTree2(tree.minx, tree.minx + half_x, tree.minz, tree.minz + half_z, tree.level + 1, tree);
if (!is_child_leave_node)
{
tree.a.BuildTree(pt);
}
tree.b = new QuadTree2(tree.minx, tree.minx + half_x, tree.minz + half_z, tree.maxz, tree.level + 1, tree);
if (!is_child_leave_node)
{
tree.b.BuildTree(pt);
}
tree.c = new QuadTree2(tree.minx + half_x, tree.maxx, tree.minz + half_z, tree.maxz, tree.level + 1, tree);
if (!is_child_leave_node)
{
tree.c.BuildTree(pt);
}
tree.d = new QuadTree2(tree.minx + half_x, tree.maxx, tree.minz, tree.minz + half_z, tree.level + 1, tree);
if (!is_child_leave_node)
{
tree.d.BuildTree(pt);
}
}
}