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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;
import javax.vecmath.Point3d;
import javax.vecmath.Point4d;
import javax.vecmath.Vector3d;
/**
* PickRay is an infinite ray pick shape. It can
* be used as an argument to the picking methods in BranchGroup and Locale.
*
* @see BranchGroup#pickAll
* @see Locale#pickAll
*/
public final class PickRay extends PickShape {
Point3d origin;
Vector3d direction;
/**
* Constructs an empty PickRay. The origin and direction of the
* ray are initialized to (0,0,0).
*/
public PickRay() {
origin = new Point3d();
direction = new Vector3d();
}
/**
* Constructs an infinite ray pick shape from the specified
* parameters.
* @param origin the origin of the ray.
* @param direction the direction of the ray.
*/
public PickRay(Point3d origin, Vector3d direction) {
this.origin = new Point3d(origin);
this.direction = new Vector3d(direction);
}
/**
* Sets the parameters of this PickRay to the specified values.
* @param origin the origin of the ray.
* @param direction the direction of the ray.
*/
public void set(Point3d origin, Vector3d direction) {
this.origin.x = origin.x;
this.origin.y = origin.y;
this.origin.z = origin.z;
this.direction.x = direction.x;
this.direction.y = direction.y;
this.direction.z = direction.z;
}
/**
* Retrieves the parameters from this PickRay.
* @param origin the Point3d object into which the origin will be copied.
* @param direction the Vector3d object into which the direction
* will be copied.
*/
public void get(Point3d origin, Vector3d direction) {
origin.x = this.origin.x;
origin.y = this.origin.y;
origin.z = this.origin.z;
direction.x = this.direction.x;
direction.y = this.direction.y;
direction.z = this.direction.z;
}
/**
* Return true if shape intersect with bounds.
* The point of intersection is stored in pickPos.
*/
@Override
final boolean intersect(Bounds bounds, Point4d pickPos) {
return bounds.intersect(origin, direction, pickPos);
}
// Only use within J3D.
// Return a new PickRay that is the transformed (t3d) of this pickRay.
@Override
PickShape transform(Transform3D t3d) {
Point3d end = new Point3d();
PickRay newPR = new PickRay(origin, direction);
end.x = origin.x + direction.x;
end.y = origin.y + direction.y;
end.z = origin.z + direction.z;
t3d.transform(newPR.origin);
t3d.transform(end);
newPR.direction.x = end.x - newPR.origin.x;
newPR.direction.y = end.y - newPR.origin.y;
newPR.direction.z = end.z - newPR.origin.z;
newPR.direction.normalize();
return newPR;
}
@Override
Point3d getStartPoint() {
return origin;
}
@Override
int getPickType() {
return PICKRAY;
}
}
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