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/*
* Copyright 1997-2008 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 specifying a wakeup when the specified object
* moves while in collision with any other object in the scene graph.
*/
public final class WakeupOnCollisionMovement extends WakeupCriterion {
// different types of WakeupIndexedList that use in GeometryStructure
static final int COND_IN_GS_LIST = 0;
static final int COLLIDEMOVE_IN_BS_LIST = 1;
// total number of different IndexedUnorderedSet types
static final int TOTAL_INDEXED_UNORDER_SET_TYPES = 2;
/**
* Use geometry in computing collisions.
*/
public static final int USE_GEOMETRY = WakeupOnCollisionEntry.USE_GEOMETRY;
/**
* Use geometric bounds as an approximation in computing collisions.
*/
public static final int USE_BOUNDS = WakeupOnCollisionEntry.USE_BOUNDS;
/**
* Accuracy mode one of USE_GEOMETRY or USE_BOUNDS
*/
int accuracyMode;
// Cached the arming Node being used when it is not BOUND
NodeRetained armingNode;
// transformed Bounds of Group/Bounds, use by
// BOUND, BOUNDINGLEAF, GROUP
Bounds vwcBounds;
// use by GROUP to cache local bounds
Bounds localBounds = null;
// source bound when collision occur last time
// These three variables are used to keep track of duplicate
// wakupOnMovement event
Bounds lastSrcBounds = null;
Bounds lastDstBounds = null;
boolean duplicateEvent = false;
// Use by BoundingLeaf, point to mirror BoundingLeaf
// transformedRegion under this leaf is used.
BoundingLeafRetained boundingLeaf = null;
/**
* Geometry atoms that this wakeup condition refer to.
* Only use by SHAPE, MORPH, GROUP, ORIENTEDSHAPE
*/
UnorderList geometryAtoms = null;
// one of GROUP, BOUNDINGLEAF, SHAPE, MORPH, BOUND
int nodeType;
SceneGraphPath armingPath = null;
Bounds armingBounds = null;
// the following two references are set only after a collision
// has occurred
SceneGraphPath collidingPath = null;
Bounds collidingBounds = null;
/**
* Constructs a new WakeupOnCollisionMovement criterion.
* @param armingPath the path used to arm collision
* detection
* @exception IllegalArgumentException if object associated with the
* SceneGraphPath is other than a Group, Shape3D, Morph, or BoundingLeaf node.
*/
public WakeupOnCollisionMovement(SceneGraphPath armingPath) {
this(armingPath, USE_BOUNDS);
}
/**
* Constructs a new WakeupOnCollisionMovement criterion.
* @param armingPath the path used to arm collision
* detection
* @param speedHint one of USE_GEOMETRY or USE_BOUNDS, specifies how
* accurately Java 3D will perform collision detection
* @exception IllegalArgumentException if hint is not one of
* USE_GEOMETRY or USE_BOUNDS.
* @exception IllegalArgumentException if object associated with the
* SceneGraphPath is other than a Group, Shape3D, Morph, or BoundingLeaf node.
*/
public WakeupOnCollisionMovement(SceneGraphPath armingPath,
int speedHint) {
this(new SceneGraphPath(armingPath), speedHint, null);
}
/**
* Constructs a new WakeupOnCollisionMovement criterion.
* @param armingNode the Group, Shape, or Morph node used to
* arm collision detection
* @exception IllegalArgumentException if object is under a
* SharedGroup node or object is other than a Group, Shape3D,
* Morph or BoundingLeaf node.
*/
public WakeupOnCollisionMovement(Node armingNode) {
this(armingNode, USE_BOUNDS);
}
/**
* Constructs a new WakeupOnCollisionMovement criterion.
* @param armingNode the Group, Shape, or Morph node used to
* arm collision detection
* @param speedHint one of USE_GEOMETRY or USE_BOUNDS, specifies how
* accurately Java 3D will perform collision detection
* @exception IllegalArgumentException if hint is not one of
* USE_GEOMETRY or USE_BOUNDS.
* @exception IllegalArgumentException if object is under a
* SharedGroup node or object is other than a Group, Shape3D,
* Morph or BoundingLeaf node.
*/
public WakeupOnCollisionMovement(Node armingNode, int speedHint) {
this(new SceneGraphPath(null, armingNode), speedHint, null);
}
/**
* Constructs a new WakeupOnCollisionMovement criterion.
* @param armingBounds the bounds object used to arm collision
* detection
*/
public WakeupOnCollisionMovement(Bounds armingBounds) {
this(null, USE_BOUNDS, (Bounds)armingBounds.clone());
}
/**
* Constructs a new WakeupOnCollisionMovement criterion.
* @param armingPath the path used to arm collision
* detection
* @param speedHint one of USE_GEOMETRY or USE_BOUNDS, specifies how
* accurately Java 3D will perform collision detection
* @param armingBounds the bounds object used to arm collision
* detection
* @exception IllegalArgumentException if hint is not one of
* USE_GEOMETRY or USE_BOUNDS.
* @exception IllegalArgumentException if object associated with the
* SceneGraphPath is other than a Group, Shape3D, Morph, or BoundingLeaf node.
*/
WakeupOnCollisionMovement(SceneGraphPath armingPath,
int speedHint, Bounds armingBounds) {
if (armingPath != null) {
this.armingNode = (NodeRetained) armingPath.getObject().retained;
nodeType = WakeupOnCollisionEntry.getNodeType(armingNode, armingPath,
"WakeupOnCollisionMovement");
this.armingPath = armingPath;
WakeupOnCollisionEntry.validateSpeedHint(speedHint,
"WakeupOnCollisionMovement4");
} else {
this.armingBounds = armingBounds;
nodeType = WakeupOnCollisionEntry.BOUND;
}
accuracyMode = speedHint;
WakeupIndexedList.init(this, TOTAL_INDEXED_UNORDER_SET_TYPES);
}
/**
* Returns the path used in specifying the collision condition.
* @return the SceneGraphPath object generated when arming this
* criterion---null implies that a bounds object armed this criteria
*/
public SceneGraphPath getArmingPath() {
return (armingPath != null ?
new SceneGraphPath(armingPath) : null);
}
/**
* Returns the bounds object used in specifying the collision condition.
* @return the Bounds object generated when arming this
* criterion---null implies that a SceneGraphPath armed this criteria
*/
public Bounds getArmingBounds() {
return (armingBounds != null ?
(Bounds)armingBounds.clone() : null);
}
/**
* Retrieves the path describing the object causing the collision.
* @return the SceneGraphPath that describes the triggering object.
* @exception IllegalStateException if not called from within the
* a behavior's processStimulus method which was awoken by a collision.
*/
public SceneGraphPath getTriggeringPath() {
if (behav == null) {
throw new IllegalStateException(J3dI18N.getString("WakeupOnCollisionMovement5"));
}
synchronized (behav) {
if (!behav.inCallback) {
throw new IllegalStateException
(J3dI18N.getString("WakeupOnCollisionMovement5"));
}
}
return (collidingPath != null ?
new SceneGraphPath(collidingPath): null);
}
/**
* Retrieves the Bounds object that caused the collision
* @return the colliding Bounds object.
* @exception IllegalStateException if not called from within the
* a behavior's processStimulus method which was awoken by a collision.
*/
public Bounds getTriggeringBounds() {
if (behav == null) {
throw new IllegalStateException(J3dI18N.getString("WakeupOnCollisionMovement6"));
}
synchronized (behav) {
if (!behav.inCallback) {
throw new IllegalStateException
(J3dI18N.getString("WakeupOnCollisionMovement6"));
}
}
return (collidingBounds != null ?
(Bounds)(collidingBounds.clone()): null);
}
/**
* This is a callback from BehaviorStructure. It is
* used to add wakeupCondition to behavior structure.
*/
@Override
void addBehaviorCondition(BehaviorStructure bs) {
switch (nodeType) {
case WakeupOnCollisionEntry.SHAPE: // Use geometryAtoms[].collisionBounds
case WakeupOnCollisionEntry.ORIENTEDSHAPE3D:
if (!armingNode.source.isLive()) {
return;
}
if (geometryAtoms == null) {
geometryAtoms = new UnorderList(1, GeometryAtom.class);
}
Shape3DRetained shape = (Shape3DRetained) armingNode;
geometryAtoms.add(Shape3DRetained.getGeomAtom(shape.getMirrorShape(armingPath)));
break;
case WakeupOnCollisionEntry.MORPH: // Use geometryAtoms[].collisionBounds
if (!armingNode.source.isLive()) {
return;
}
if (geometryAtoms == null) {
geometryAtoms = new UnorderList(1, GeometryAtom.class);
}
MorphRetained morph = (MorphRetained) armingNode;
geometryAtoms.add(Shape3DRetained.getGeomAtom(morph.getMirrorShape(armingPath)));
break;
case WakeupOnCollisionEntry.BOUNDINGLEAF: // use BoundingLeaf.transformedRegion
if (!armingNode.source.isLive()) {
return;
}
this.boundingLeaf = ((BoundingLeafRetained) armingNode).mirrorBoundingLeaf;
break;
case WakeupOnCollisionEntry.BOUND: // use this.vwcBounds
vwcBounds = (Bounds) armingBounds.clone();
this.armingNode = behav;
break;
case WakeupOnCollisionEntry.GROUP:
if (!armingNode.source.isLive()) {
return;
}
if (accuracyMode == USE_GEOMETRY) {
if (geometryAtoms == null) {
geometryAtoms = new UnorderList(1, GeometryAtom.class);
}
((GroupRetained) armingNode).searchGeometryAtoms(geometryAtoms);
}
// else use this.vwcBounds
default:
}
behav.universe.geometryStructure.addWakeupOnCollision(this);
}
/**
* This is a callback from BehaviorStructure. It is
* used to remove wakeupCondition from behavior structure.
*/
@Override
void removeBehaviorCondition(BehaviorStructure bs) {
vwcBounds = null;
if (geometryAtoms != null) {
geometryAtoms.clear();
}
boundingLeaf = null;
behav.universe.geometryStructure.removeWakeupOnCollision(this);
}
// Set collidingPath & collidingBounds
void setTarget(BHLeafInterface leaf) {
SceneGraphPath path;
Bounds bound;
if (leaf instanceof GeometryAtom) {
// Find the triggered Path & Bounds for this geometry Atom
GeometryAtom geomAtom = (GeometryAtom) leaf;
Shape3DRetained shape = geomAtom.source;
path = WakeupOnCollisionEntry.getSceneGraphPath(
shape.sourceNode,
shape.key,
shape.getCurrentLocalToVworld(0));
bound = WakeupOnCollisionEntry.getTriggeringBounds(shape);
} else {
// Find the triggered Path & Bounds for this alternative
// collision target
GroupRetained group = (GroupRetained) leaf;
path = WakeupOnCollisionEntry.getSceneGraphPath(group);
bound = WakeupOnCollisionEntry.getTriggeringBounds(group);
}
if (path != null) {
// colliding path may be null when branch detach before
// user behavior retrieve the previous colliding path
collidingPath = path;
collidingBounds = bound;
}
}
// Invoke from GeometryStructure to update vwcBounds of GROUP
void updateCollisionBounds(boolean reEvaluateGAs) {
if (nodeType == WakeupOnCollisionEntry.GROUP) {
GroupRetained group = (GroupRetained) armingNode;
if (group.collisionBound != null) {
vwcBounds = (Bounds) group.collisionBound.clone();
} else {
// this may involve recursive tree traverse if
// BoundsAutoCompute is true, we can't avoid
// since the bound under it may change by transform
vwcBounds = group.getEffectiveBounds();
}
group.transformBounds(armingPath, vwcBounds);
} else if (nodeType == WakeupOnCollisionEntry.BOUND) {
vwcBounds.transform(armingBounds, behav.getCurrentLocalToVworld());
}
if (reEvaluateGAs &&
(nodeType == WakeupOnCollisionEntry.GROUP) &&
(accuracyMode == USE_GEOMETRY)) {
geometryAtoms.clear();
((GroupRetained) armingNode).searchGeometryAtoms(geometryAtoms);
}
}
@Override
void setTriggered(){
// if path not set, probably the branch is just detach.
if (collidingPath != null) {
super.setTriggered();
}
}
/**
* Perform task in addBehaviorCondition() that has to be
* set every time the condition met.
*/
@Override
void resetBehaviorCondition(BehaviorStructure bs) {
// The reference geometryAtom will not change once
// Shape3D create so there is no need to set this.
}
}
