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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;
/**
* The Clip leaf node defines the back, or far, clip distance in
* the virtual universe.
* The distance is specified in the local coordinate system of this node.
* This node also specifies an application
* region in which this clip node is active.
* A Clip node is active when its application region intersects
* the ViewPlatform's activation volume. If multiple Clip nodes
* are active, the Clip node that is "closest" to the eye will be
* used.
* If no clip node is in scope of the view platform
* associated with the current view, then the back clip distance is
* defined by the View object.
* The front clip distance is always defined by the
* View object.
*
* @see View
*/
public class Clip extends Leaf {
/**
* Specifies that the Clip allows read access to its application
* bounds and bounding leaf at runtime.
*/
public static final int
ALLOW_APPLICATION_BOUNDS_READ = CapabilityBits.CLIP_ALLOW_APPLICATION_BOUNDS_READ;
/**
* Specifies that the Clip allows write access to its application
* bounds and bounding leaf at runtime.
*/
public static final int
ALLOW_APPLICATION_BOUNDS_WRITE = CapabilityBits.CLIP_ALLOW_APPLICATION_BOUNDS_WRITE;
/**
* Specifies that the Clip allows read access to its back distance
* at runtime.
*/
public static final int
ALLOW_BACK_DISTANCE_READ = CapabilityBits.CLIP_ALLOW_BACK_DISTANCE_READ;
/**
* Specifies that the Clip allows write access to its back distance
* at runtime.
*/
public static final int
ALLOW_BACK_DISTANCE_WRITE = CapabilityBits.CLIP_ALLOW_BACK_DISTANCE_WRITE;
// Array for setting default read capabilities
private static final int[] readCapabilities = {
ALLOW_APPLICATION_BOUNDS_READ,
ALLOW_BACK_DISTANCE_READ
};
/**
* Constructs a Clip node with default parameters. The default
* values are as follows:
*
* back clip distance : 100 meters
* application bounds : null
* application bounding leaf : null
*
*/
public Clip () {
// Just use the defaults
// set default read capabilities
setDefaultReadCapabilities(readCapabilities);
}
/**
* Constructs a Clip node with the specified back clip distance.
*/
public Clip(double backDistance) {
// set default read capabilities
setDefaultReadCapabilities(readCapabilities);
((ClipRetained)this.retained).initBackDistance(backDistance);
}
/**
* Sets the back clip distance to the specified value.
* There are several considerations that need to be taken into
* account when choosing values for the front and back clip
* distances. These are enumerated in the description of
*
* View.setFrontClipDistance.
* @param backDistance the new back clip distance in meters
* @see View#setFrontClipDistance
* @see View#setBackClipDistance
*/
public void setBackDistance(double backDistance) {
if (isLiveOrCompiled())
if(!this.getCapability(ALLOW_BACK_DISTANCE_WRITE))
throw new CapabilityNotSetException(J3dI18N.getString("Clip0"));
if (isLive())
((ClipRetained)this.retained).setBackDistance(backDistance);
else
((ClipRetained)this.retained).initBackDistance(backDistance);
}
/**
* Retrieves the back clip distance.
* @return the current back clip distance, in meters
*/
public double getBackDistance() {
if (isLiveOrCompiled())
if(!this.getCapability(ALLOW_BACK_DISTANCE_READ))
throw new CapabilityNotSetException(J3dI18N.getString("Clip1"));
return ((ClipRetained)this.retained).getBackDistance();
}
/**
* Set the Clip's application region to the specified bounds.
* This is used when the application bounding leaf is set to null.
* @param region the bounds that contains the Clip's new application
* region.
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*/
public void setApplicationBounds(Bounds region) {
if (isLiveOrCompiled())
if(!this.getCapability(ALLOW_APPLICATION_BOUNDS_WRITE))
throw new CapabilityNotSetException(J3dI18N.getString("Clip2"));
if (isLive())
((ClipRetained)this.retained).setApplicationBounds(region);
else
((ClipRetained)this.retained).initApplicationBounds(region);
}
/**
* Retrieves the Clip node's application bounds.
* @return this Clip's application bounds information
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*/
public Bounds getApplicationBounds() {
if (isLiveOrCompiled())
if(!this.getCapability(ALLOW_APPLICATION_BOUNDS_READ))
throw new CapabilityNotSetException(J3dI18N.getString("Clip3"));
return ((ClipRetained)this.retained).getApplicationBounds();
}
/**
* Set the Clip's application region to the specified bounding leaf.
* When set to a value other than null, this overrides the application
* bounds object.
* @param region the bounding leaf node used to specify the Clip
* node's new application region.
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*/
public void setApplicationBoundingLeaf(BoundingLeaf region) {
if (isLiveOrCompiled())
if(!this.getCapability(ALLOW_APPLICATION_BOUNDS_WRITE))
throw new CapabilityNotSetException(J3dI18N.getString("Clip2"));
if (isLive())
((ClipRetained)this.retained).setApplicationBoundingLeaf(region);
else
((ClipRetained)this.retained).initApplicationBoundingLeaf(region);
}
/**
* Retrieves the Clip node's application bounding leaf.
* @return this Clip's application bounding leaf information
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*/
public BoundingLeaf getApplicationBoundingLeaf() {
if (isLiveOrCompiled())
if(!this.getCapability(ALLOW_APPLICATION_BOUNDS_READ))
throw new CapabilityNotSetException(J3dI18N.getString("Clip3"));
return ((ClipRetained)this.retained).getApplicationBoundingLeaf();
}
/**
* Creates the retained mode ClipRetained object that this
* Clip component object will point to.
*/
@Override
void createRetained() {
this.retained = new ClipRetained();
this.retained.setSource(this);
}
/**
* Used to create a new instance of the node. This routine is called
* by cloneTree to duplicate the current node.
* @param forceDuplicate when set to true, causes the
* duplicateOnCloneTree flag to be ignored. When
* false, the value of each node's
* duplicateOnCloneTree variable determines whether
* NodeComponent data is duplicated or copied.
*
* @see Node#cloneTree
* @see Node#cloneNode
* @see Node#duplicateNode
* @see NodeComponent#setDuplicateOnCloneTree
*/
@Override
public Node cloneNode(boolean forceDuplicate) {
Clip c = new Clip();
c.duplicateNode(this, forceDuplicate);
return c;
}
/**
* Callback used to allow a node to check if any scene graph objects
* referenced
* by that node have been duplicated via a call to cloneTree.
* This method is called by cloneTree after all nodes in
* the sub-graph have been duplicated. The cloned Leaf node's method
* will be called and the Leaf node can then look up any object references
* by using the getNewObjectReference method found in the
* NodeReferenceTable object. If a match is found, a
* reference to the corresponding object in the newly cloned sub-graph
* is returned. If no corresponding reference is found, either a
* DanglingReferenceException is thrown or a reference to the original
* object is returned depending on the value of the
* allowDanglingReferences parameter passed in the
* cloneTree call.
*
* NOTE: Applications should not call this method directly.
* It should only be called by the cloneTree method.
*
* @param referenceTable a NodeReferenceTableObject that contains the
* getNewObjectReference method needed to search for
* new object instances.
* @see NodeReferenceTable
* @see Node#cloneTree
* @see DanglingReferenceException
*/
@Override
public void updateNodeReferences(NodeReferenceTable referenceTable) {
ClipRetained rt = (ClipRetained) retained;
BoundingLeaf bl = rt.getApplicationBoundingLeaf();
// check for applicationBoundingLeaf
if (bl != null) {
Object o = referenceTable.getNewObjectReference(bl);
rt.initApplicationBoundingLeaf((BoundingLeaf) o);
}
}
/**
* Copies all Clip information from
* originalNode into
* the current node. This method is called from the
* cloneNode method which is, in turn, called by the
* cloneTree method.
*
* @param originalNode the original node to duplicate.
* @param forceDuplicate when set to true, causes the
* duplicateOnCloneTree flag to be ignored. When
* false, the value of each node's
* duplicateOnCloneTree variable determines whether
* NodeComponent data is duplicated or copied.
*
* @exception RestrictedAccessException if this object is part of a live
* or compiled scenegraph.
*
* @see Node#duplicateNode
* @see Node#cloneTree
* @see NodeComponent#setDuplicateOnCloneTree
*/
@Override
void duplicateAttributes(Node originalNode, boolean forceDuplicate) {
super.duplicateAttributes(originalNode, forceDuplicate);
ClipRetained attr = (ClipRetained) originalNode.retained;
ClipRetained rt = (ClipRetained) retained;
rt.initBackDistance(attr.getBackDistance());
rt.initApplicationBounds(attr.getApplicationBounds());
// correct value will set in updateNodeReferences
rt.initApplicationBoundingLeaf(attr.getApplicationBoundingLeaf());
}
}