Java tutorial
/* * 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.Matrix4d; import javax.vecmath.Point3f; import javax.vecmath.Quat4f; import javax.vecmath.Vector3f; /** * RotPosPathInterpolator behavior. This class defines a behavior that * modifies the rotational and translational components of its target * TransformGroup by linearly interpolating among a series of predefined * knot/positon and knot/orientation pairs (using the value generated * by the specified Alpha object). The interpolated position and * orientation are used to generate a transform in the local coordinate * system of this interpolator. */ public class RotPosPathInterpolator extends PathInterpolator { private Transform3D rotation = new Transform3D(); private Vector3f pos = new Vector3f(); private Quat4f tQuat = new Quat4f(); private Matrix4d tMat = new Matrix4d(); // Arrays of quaternions and positions at each knot private Quat4f quats[]; private Point3f positions[]; private float prevInterpolationValue = Float.NaN; // We can't use a boolean flag since it is possible // that after alpha change, this procedure only run // once at alpha.finish(). So the best way is to // detect alpha value change. private float prevAlphaValue = Float.NaN; private WakeupCriterion passiveWakeupCriterion = new WakeupOnElapsedFrames(0, true); // non-public, default constructor used by cloneNode RotPosPathInterpolator() { } /** * Constructs a new interpolator that varies the rotation and translation * of the target TransformGroup's transform. * @param alpha the alpha object for this interpolator * @param target the TransformGroup node affected by this translator * @param axisOfTransform the transform that defines the local coordinate * system in which this interpolator operates * @param knots an array of knot values that specify interpolation points. * @param quats an array of quaternion values at the knots. * @param positions an array of position values at the knots. * @exception IllegalArgumentException if the lengths of the * knots, quats, and positions arrays are not all the same. */ public RotPosPathInterpolator(Alpha alpha, TransformGroup target, Transform3D axisOfTransform, float[] knots, Quat4f[] quats, Point3f[] positions) { super(alpha, target, axisOfTransform, knots); if (knots.length != positions.length) throw new IllegalArgumentException(J3dI18N.getString("RotPosPathInterpolator0")); if (knots.length != quats.length) throw new IllegalArgumentException(J3dI18N.getString("RotPosPathInterpolator0")); setPathArrays(quats, positions); } /** * Sets the quat at the specified index for this interpolator. * @param index the index to be changed * @param quat the new quat value */ public void setQuat(int index, Quat4f quat) { this.quats[index].set(quat); } /** * Retrieves the quat value at the specified index. * @param index the index of the value requested * @param quat the quat to receive the quat value at the index */ public void getQuat(int index, Quat4f quat) { quat.set(this.quats[index]); } /** * Sets the position at the specified index for this * interpolator. * @param index the index to be changed * @param position the new position value */ public void setPosition(int index, Point3f position) { this.positions[index].set(position); } /** * Retrieves the position value at the specified index. * @param index the index of the value requested * @param position the position to receive the position value at the index */ public void getPosition(int index, Point3f position) { position.set(this.positions[index]); } /** * Replaces the existing arrays of knot values, quaternion * values, and position values with the specified arrays. * The arrays of knots, quats, and positions are copied * into this interpolator object. * @param knots a new array of knot values that specify * interpolation points. * @param quats a new array of quaternion values at the knots. * @param positions a new array of position values at the knots. * @exception IllegalArgumentException if the lengths of the * knots, quats, and positions arrays are not all the same. * * @since Java 3D 1.2 */ public void setPathArrays(float[] knots, Quat4f[] quats, Point3f[] positions) { if (knots.length != quats.length) throw new IllegalArgumentException(J3dI18N.getString("RotPosPathInterpolator0")); if (knots.length != positions.length) throw new IllegalArgumentException(J3dI18N.getString("RotPosPathInterpolator0")); setKnots(knots); setPathArrays(quats, positions); } // Set the specific arrays for this path interpolator private void setPathArrays(Quat4f[] quats, Point3f[] positions) { this.quats = new Quat4f[quats.length]; for (int i = 0; i < quats.length; i++) { this.quats[i] = new Quat4f(); this.quats[i].set(quats[i]); } this.positions = new Point3f[positions.length]; for (int i = 0; i < positions.length; i++) { this.positions[i] = new Point3f(); this.positions[i].set(positions[i]); } } /** * Copies the array of quaternion values from this interpolator * into the specified array. * The array must be large enough to hold all of the quats. * The individual array elements must be allocated by the caller. * @param quats array that will receive the quats. * * @since Java 3D 1.2 */ public void getQuats(Quat4f[] quats) { for (int i = 0; i < this.quats.length; i++) { quats[i].set(this.quats[i]); } } /** * Copies the array of position values from this interpolator * into the specified array. * The array must be large enough to hold all of the positions. * The individual array elements must be allocated by the caller. * @param positions array that will receive the positions. * * @since Java 3D 1.2 */ public void getPositions(Point3f[] positions) { for (int i = 0; i < this.positions.length; i++) { positions[i].set(this.positions[i]); } } /** * @deprecated As of Java 3D version 1.3, replaced by * <code>TransformInterpolator.setTransformAxis(Transform3D)</code> */ public void setAxisOfRotPos(Transform3D axisOfRotPos) { setTransformAxis(axisOfRotPos); } /** * @deprecated As of Java 3D version 1.3, replaced by * <code>TransformInterpolator.getTransformAxis()</code> */ public Transform3D getAxisOfRotPos() { return getTransformAxis(); } /** * Computes the new transform for this interpolator for a given * alpha value. * * @param alphaValue alpha value between 0.0 and 1.0 * @param transform object that receives the computed transform for * the specified alpha value * * @since Java 3D 1.3 */ @Override public void computeTransform(float alphaValue, Transform3D transform) { double quatDot; computePathInterpolation(alphaValue); if (currentKnotIndex == 0 && currentInterpolationValue == 0f) { tQuat.x = quats[0].x; tQuat.y = quats[0].y; tQuat.z = quats[0].z; tQuat.w = quats[0].w; pos.x = positions[0].x; pos.y = positions[0].y; pos.z = positions[0].z; } else { quatDot = quats[currentKnotIndex].x * quats[currentKnotIndex + 1].x + quats[currentKnotIndex].y * quats[currentKnotIndex + 1].y + quats[currentKnotIndex].z * quats[currentKnotIndex + 1].z + quats[currentKnotIndex].w * quats[currentKnotIndex + 1].w; if (quatDot < 0) { tQuat.x = quats[currentKnotIndex].x + (-quats[currentKnotIndex + 1].x - quats[currentKnotIndex].x) * currentInterpolationValue; tQuat.y = quats[currentKnotIndex].y + (-quats[currentKnotIndex + 1].y - quats[currentKnotIndex].y) * currentInterpolationValue; tQuat.z = quats[currentKnotIndex].z + (-quats[currentKnotIndex + 1].z - quats[currentKnotIndex].z) * currentInterpolationValue; tQuat.w = quats[currentKnotIndex].w + (-quats[currentKnotIndex + 1].w - quats[currentKnotIndex].w) * currentInterpolationValue; } else { tQuat.x = quats[currentKnotIndex].x + (quats[currentKnotIndex + 1].x - quats[currentKnotIndex].x) * currentInterpolationValue; tQuat.y = quats[currentKnotIndex].y + (quats[currentKnotIndex + 1].y - quats[currentKnotIndex].y) * currentInterpolationValue; tQuat.z = quats[currentKnotIndex].z + (quats[currentKnotIndex + 1].z - quats[currentKnotIndex].z) * currentInterpolationValue; tQuat.w = quats[currentKnotIndex].w + (quats[currentKnotIndex + 1].w - quats[currentKnotIndex].w) * currentInterpolationValue; } pos.x = positions[currentKnotIndex].x + (positions[currentKnotIndex + 1].x - positions[currentKnotIndex].x) * currentInterpolationValue; pos.y = positions[currentKnotIndex].y + (positions[currentKnotIndex + 1].y - positions[currentKnotIndex].y) * currentInterpolationValue; pos.z = positions[currentKnotIndex].z + (positions[currentKnotIndex + 1].z - positions[currentKnotIndex].z) * currentInterpolationValue; } tQuat.normalize(); // Set the rotation components tMat.set(tQuat); // Set the translation components. tMat.m03 = pos.x; tMat.m13 = pos.y; tMat.m23 = pos.z; rotation.set(tMat); // construct a Transform3D from: axis * rotation * axisInverse transform.mul(axis, rotation); transform.mul(transform, axisInverse); } /** * Used to create a new instance of the node. This routine is called * by <code>cloneTree</code> to duplicate the current node. * @param forceDuplicate when set to <code>true</code>, causes the * <code>duplicateOnCloneTree</code> flag to be ignored. When * <code>false</code>, the value of each node's * <code>duplicateOnCloneTree</code> 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) { RotPosPathInterpolator rppi = new RotPosPathInterpolator(); rppi.duplicateNode(this, forceDuplicate); return rppi; } /** * Copies all RotPosPathInterpolator information from * <code>originalNode</code> into * the current node. This method is called from the * <code>cloneNode</code> method which is, in turn, called by the * <code>cloneTree</code> method.<P> * * @param originalNode the original node to duplicate. * @param forceDuplicate when set to <code>true</code>, causes the * <code>duplicateOnCloneTree</code> flag to be ignored. When * <code>false</code>, the value of each node's * <code>duplicateOnCloneTree</code> 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); RotPosPathInterpolator ri = (RotPosPathInterpolator) originalNode; int len = ri.getArrayLengths(); // No API availble to set array size, so explicitly set it here positions = new Point3f[len]; quats = new Quat4f[len]; Point3f point = new Point3f(); Quat4f quat = new Quat4f(); for (int i = 0; i < len; i++) { positions[i] = new Point3f(); ri.getPosition(i, point); setPosition(i, point); quats[i] = new Quat4f(); ri.getQuat(i, quat); setQuat(i, quat); } } }