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/*
* Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package javax.media.j3d;
class BHInternalNode extends BHNode {
static boolean debug2 = true;
BHNode rChild;
BHNode lChild;
BHInternalNode() {
super();
nodeType = BH_TYPE_INTERNAL;
this.rChild = null;
this.lChild = null;
}
BHInternalNode(BHNode parent) {
super(parent);
nodeType = BH_TYPE_INTERNAL;
this.rChild = null;
this.lChild = null;
}
BHInternalNode(BHNode parent, BHNode rChild, BHNode lChild) {
super(parent);
nodeType = BH_TYPE_INTERNAL;
this.rChild = rChild;
this.lChild = lChild;
}
BHInternalNode(BHNode parent, BoundingBox bHull) {
super(parent, bHull);
nodeType = BH_TYPE_INTERNAL;
this.rChild = null;
this.lChild = null;
}
BHInternalNode(BHNode parent, BHNode rChild, BHNode lChild, BoundingBox bHull) {
super(parent, bHull);
nodeType = BH_TYPE_INTERNAL;
this.rChild = rChild;
this.lChild = lChild;
}
BHNode getLeftChild() {
return (BHNode) lChild;
}
BHNode getRightChild() {
return (BHNode) rChild;
}
void setLeftChild(BHNode child) {
lChild = child;
}
void setRightChild(BHNode child) {
rChild = child;
}
void computeBoundingHull(BoundingBox bHull) {
computeBoundingHull();
bHull.set(this.bHull);
}
@Override
void computeBoundingHull() {
BoundingBox rChildBound = null;
BoundingBox lChildBound = null;
int i;
if((lChild==null) && (rChild==null)) {
bHull = null;
return;
}
if(lChild != null)
lChildBound = lChild.getBoundingHull();
if(rChild != null)
rChildBound = rChild.getBoundingHull();
if(bHull == null)
bHull = new BoundingBox();
// Since left child is null. bHull is equal to right child's Hull.
if(lChild == null) {
bHull.set(rChildBound);
return;
}
// Since right child is null. bHull is equal to left child's Hull.
if(rChild == null) {
bHull.set(lChildBound);
return;
}
// Compute the combined bounds of the children.
bHull.set(rChildBound);
bHull.combine(lChildBound);
}
@Override
void updateMarkedBoundingHull() {
if(mark == false)
return;
rChild.updateMarkedBoundingHull();
lChild.updateMarkedBoundingHull();
computeBoundingHull();
mark = false;
}
// this method inserts a single element into the tree given the stipulation
// that the current tree node already contains the child ... 3 cases
// one --node is inside the left child, and not inside the right
// so recurse placing it inside the left child
// two -- node is not inside the left but is inside the right
// recurse placing it inside the right child
// three -- node is not inside either one, added it to the current
// element
void insert( BHNode node, BHInsertStructure insertStructure ) {
// NOTE: the node must already be inside this node if its not then fail.
if(debug2)
if ( !this.isInside(node.bHull) ) {
System.err.println("Incorrect use of insertion, current node");
System.err.println("must contain the input element ...");
}
boolean insideRightChild = false;
boolean insideLeftChild = false;
// leaf children are considered inpenetrable for insert so returns false
if(this.rChild.nodeType == BHNode.BH_TYPE_LEAF) {
insideRightChild = false;
} else {
insideRightChild = this.rChild.isInside(node.bHull);
}
if(this.lChild.nodeType == BHNode.BH_TYPE_LEAF) {
insideLeftChild = false;
} else {
insideLeftChild = this.lChild.isInside(node.bHull);
}
if ( insideLeftChild && !insideRightChild ) {
((BHInternalNode)this.lChild).insert(node, insertStructure);
} else if ( !insideLeftChild && insideRightChild ) {
((BHInternalNode)this.rChild).insert(node, insertStructure);
} else if ( insideLeftChild && insideRightChild ) {
// choose randomly to put it in the left or right
if ( insertStructure.randomNumber.nextBoolean() ) {
((BHInternalNode)this.lChild).insert(node, insertStructure);
} else {
((BHInternalNode)this.rChild).insert(node, insertStructure);
}
} else {
// doesn't fit in either one ....
// lookup the current node this in the auxilaryInsertStructure
// if it appears then add element to the array of sub elements
// if not then allocate a new element to the array
insertStructure.lookupAndInsert(this, node);
}
}
@Override
void destroyTree(BHNode[] bhArr, int[] index) {
if(rChild != null)
rChild.destroyTree(bhArr, index);
if(lChild != null)
lChild.destroyTree(bhArr, index);
rChild = null;
lChild = null;
}
}
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