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Java Source Code / Java Documentation » 6.0 JDK Modules » java 3d » com.sun.j3d.utils.behaviors.interpolators 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: KBRotPosScaleSplinePathInterpolator.java,v $
003:         *
004:         * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * - Redistribution of source code must retain the above copyright
011:         *   notice, this list of conditions and the following disclaimer.
012:         *
013:         * - Redistribution in binary form must reproduce the above copyright
014:         *   notice, this list of conditions and the following disclaimer in
015:         *   the documentation and/or other materials provided with the
016:         *   distribution.
017:         *
018:         * Neither the name of Sun Microsystems, Inc. or the names of
019:         * contributors may be used to endorse or promote products derived
020:         * from this software without specific prior written permission.
021:         *
022:         * This software is provided "AS IS," without a warranty of any
023:         * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
024:         * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
025:         * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
026:         * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
027:         * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
028:         * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
029:         * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
030:         * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
031:         * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
032:         * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
033:         * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
034:         * POSSIBILITY OF SUCH DAMAGES.
035:         *
036:         * You acknowledge that this software is not designed, licensed or
037:         * intended for use in the design, construction, operation or
038:         * maintenance of any nuclear facility.
039:         *
040:         * $Revision: 1.4 $
041:         * $Date: 2007/02/09 17:20:11 $
042:         * $State: Exp $
043:         */
044:
045:        package com.sun.j3d.utils.behaviors.interpolators;
046:
047:        import javax.media.j3d.*;
048:        import java.util.*;
049:        import javax.vecmath.*;
050:
051:        /**
052:         * KBRotPosScaleSplinePathInterpolator; A rotation and position path 
053:         * interpolation behavior node using Kochanek-Bartels cubic splines
054:         * (also known as TCB or Tension-Continuity-Bias Splines).
055:         *
056:         * @since Java3D 1.2
057:         */
058:
059:        /**
060:         * KBRotPosScaleSplinePathInterpolator behavior.  This class defines a 
061:         * behavior that varies the rotational, translational, and scale components 
062:         * of its target TransformGroup by using the Kochanek-Bartels cubic spline 
063:         * interpolation to interpolate among a series of key frames
064:         * (using the value generated by the specified Alpha object).  The
065:         * interpolated position, orientation, and scale are used to generate
066:         * a transform in the local coordinate system of this interpolator.  
067:         */
068:
069:        public class KBRotPosScaleSplinePathInterpolator extends
070:                KBSplinePathInterpolator {
071:
072:            private Transform3D rotation = new Transform3D();
073:
074:            private Matrix4d pitchMat = new Matrix4d(); // pitch matrix
075:            private Matrix4d bankMat = new Matrix4d(); // bank matrix
076:            private Matrix4d tMat = new Matrix4d(); // transformation matrix
077:            private Matrix4d sMat = new Matrix4d(); // scale matrix
078:            //Quat4f         iQuat       = new Quat4f();     // interpolated quaternion
079:            private Vector3f iPos = new Vector3f(); // interpolated position 
080:            private Point3f iScale = new Point3f(); // interpolated scale 
081:            float iHeading, iPitch, iBank; // interpolated heading,
082:            // pitch and bank
083:
084:            KBCubicSplineCurve cubicSplineCurve = new KBCubicSplineCurve();
085:            KBCubicSplineSegment cubicSplineSegments[];
086:            int numSegments;
087:            int currentSegmentIndex;
088:            KBCubicSplineSegment currentSegment;
089:
090:            // non-public, default constructor used by cloneNode
091:            KBRotPosScaleSplinePathInterpolator() {
092:            }
093:
094:            /**
095:             * Constructs a new KBRotPosScaleSplinePathInterpolator object that 
096:             * varies the rotation, translation, and scale of the target 
097:             * TransformGroup's transform.  At least 2 key frames are required for 
098:             * this interpolator. The first key
099:             * frame's knot must have a value of 0.0 and the last knot must have a
100:             * value of 1.0.  An intermediate key frame with index k must have a
101:             * knot value strictly greater than the knot value of a key frame with
102:             * index less than k.
103:             * @param alpha the alpha object for this interpolator
104:             * @param target the TransformGroup node affected by this interpolator
105:             * @param axisOfTransform the transform that specifies the local
106:             * coordinate system in which this interpolator operates.
107:             * @param keys an array of key frames that defien the motion path 
108:             */
109:            public KBRotPosScaleSplinePathInterpolator(Alpha alpha,
110:                    TransformGroup target, Transform3D axisOfTransform,
111:                    KBKeyFrame keys[]) {
112:                super (alpha, target, axisOfTransform, keys);
113:
114:                // Create a spline curve using the derived key frames
115:                cubicSplineCurve = new KBCubicSplineCurve(this .keyFrames);
116:                numSegments = cubicSplineCurve.numSegments;
117:
118:            }
119:
120:            /**
121:             * @deprecated As of Java 3D version 1.3, replaced by
122:             * <code>TransformInterpolator.setTransformAxis(Transform3D)</code>
123:             */
124:            public void setAxisOfRotPosScale(Transform3D axisOfRotPosScale) {
125:                setTransformAxis(axisOfRotPosScale);
126:            }
127:
128:            /**
129:             * @deprecated As of Java 3D version 1.3, replaced by
130:             * <code>TransformInterpolator.getTransformAxis()</code>
131:             */
132:            public Transform3D getAxisOfRotPosScale() {
133:                return getTransformAxis();
134:            }
135:
136:            /**
137:             * Set the key frame at the specified index to <code>keyFrame</code>
138:             * @param index Index of the key frame to change
139:             * @param keyFrame The new key frame
140:             */
141:            public void setKeyFrame(int index, KBKeyFrame keyFrame) {
142:                super .setKeyFrame(index, keyFrame);
143:
144:                // TODO Optimize this
145:                // Create a spline curve using the derived key frames
146:                cubicSplineCurve = new KBCubicSplineCurve(this .keyFrames);
147:                numSegments = cubicSplineCurve.numSegments;
148:            }
149:
150:            /**
151:             * Set all the key frames
152:             * @param keyFrame The new key frames
153:             */
154:            public void setKeyFrames(KBKeyFrame[] keyFrame) {
155:                super .setKeyFrames(keyFrame);
156:
157:                // Create a spline curve using the derived key frames
158:                cubicSplineCurve = new KBCubicSplineCurve(this .keyFrames);
159:                numSegments = cubicSplineCurve.numSegments;
160:            }
161:
162:            /**
163:             * Computes the new transform for this interpolator for a given
164:             * alpha value.
165:             *
166:             * @param alphaValue alpha value between 0.0 and 1.0
167:             * @param transform object that receives the computed transform for
168:             * the specified alpha value
169:             *
170:             * @since Java 3D 1.3
171:             */
172:            public void computeTransform(float alphaValue, Transform3D transform) {
173:                // compute the current value of u from alpha and the 
174:                // determine lower and upper knot points
175:                computePathInterpolation(alphaValue);
176:
177:                // Determine the segment within which we will be interpolating
178:                currentSegmentIndex = this .lowerKnot - 1;
179:
180:                // if we are at the start of the curve 
181:                if (currentSegmentIndex == 0 && currentU == 0f) {
182:
183:                    iHeading = keyFrames[1].heading;
184:                    iPitch = keyFrames[1].pitch;
185:                    iBank = keyFrames[1].bank;
186:                    iPos.set(keyFrames[1].position);
187:                    iScale.set(keyFrames[1].scale);
188:
189:                    // if we are at the end of the curve 
190:                } else if (currentSegmentIndex == (numSegments - 1)
191:                        && currentU == 1.0) {
192:
193:                    iHeading = keyFrames[upperKnot].heading;
194:                    iPitch = keyFrames[upperKnot].pitch;
195:                    iBank = keyFrames[upperKnot].bank;
196:                    iPos.set(keyFrames[upperKnot].position);
197:                    iScale.set(keyFrames[upperKnot].scale);
198:
199:                    // if we are somewhere in between the curve
200:                } else {
201:
202:                    // Get a reference to the current spline segment i.e. the
203:                    // one bounded by lowerKnot and upperKnot 
204:                    currentSegment = cubicSplineCurve
205:                            .getSegment(currentSegmentIndex);
206:
207:                    // interpolate quaternions 
208:                    iHeading = currentSegment.getInterpolatedHeading(currentU);
209:                    iPitch = currentSegment.getInterpolatedPitch(currentU);
210:                    iBank = currentSegment.getInterpolatedBank(currentU);
211:
212:                    // interpolate position
213:                    currentSegment
214:                            .getInterpolatedPositionVector(currentU, iPos);
215:
216:                    // interpolate position
217:                    currentSegment.getInterpolatedScale(currentU, iScale);
218:
219:                }
220:
221:                // Generate a transformation matrix in tMat using interpolated 
222:                // heading, pitch and bank
223:                pitchMat.setIdentity();
224:                pitchMat.rotX(-iPitch);
225:                bankMat.setIdentity();
226:                bankMat.rotZ(iBank);
227:                tMat.setIdentity();
228:                tMat.rotY(-iHeading);
229:                tMat.mul(pitchMat);
230:                tMat.mul(bankMat);
231:
232:                // TODO: Handle Non-Uniform scale
233:                // Currently this interpolator does not handle non uniform scale 
234:                // We cheat by just taking the x scale component
235:
236:                // Scale the transformation matrix
237:                sMat.set((double) iScale.x);
238:                tMat.mul(sMat);
239:
240:                // Set the translation components.
241:                tMat.m03 = iPos.x;
242:                tMat.m13 = iPos.y;
243:                tMat.m23 = iPos.z;
244:                rotation.set(tMat);
245:
246:                // construct a Transform3D from:  axis * rotation * axisInverse 
247:                transform.mul(axis, rotation);
248:                transform.mul(transform, axisInverse);
249:            }
250:
251:            /**
252:             * Copies KBRotPosScaleSplinePathInterpolator information from
253:             * <code>originalNode</code> into
254:             * the current node.  This method is called from the
255:             * <code>cloneNode</code> method which is, in turn, called by the
256:             * <code>cloneTree</code> method.<P> 
257:             *
258:             * @param forceDuplicate when set to <code>true</code>, causes the
259:             *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
260:             *  <code>false</code>, the value of each node's
261:             *  <code>duplicateOnCloneTree</code> variable determines whether
262:             *  NodeComponent data is duplicated or copied.
263:             *
264:             * @exception RestrictedAccessException if this object is part of a live
265:             *  or compiled scenegraph.
266:             *
267:             * @see Node#duplicateNode
268:             * @see Node#cloneTree
269:             * @see NodeComponent#setDuplicateOnCloneTree
270:             */
271:            public Node cloneNode(boolean forceDuplicate) {
272:                KBRotPosScaleSplinePathInterpolator spline = new KBRotPosScaleSplinePathInterpolator();
273:
274:                spline.duplicateNode(this , forceDuplicate);
275:                return spline;
276:            }
277:
278:            /**
279:             * Copies KBRotPosScaleSplinePathInterpolator information from
280:             * <code>originalNode</code> into
281:             * the current node.  This method is called from the
282:             * <code>cloneNode</code> method which is, in turn, called by the
283:             * <code>cloneTree</code> method.<P> 
284:             *
285:             * @param originalNode the original node to duplicate.
286:             * @param forceDuplicate when set to <code>true</code>, causes the
287:             *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
288:             *  <code>false</code>, the value of each node's
289:             *  <code>duplicateOnCloneTree</code> variable determines whether
290:             *  NodeComponent data is duplicated or copied.
291:             *
292:             * @exception RestrictedAccessException if this object is part of a live
293:             *  or compiled scenegraph.
294:             *
295:             * @see Node#duplicateNode
296:             * @see Node#cloneTree
297:             * @see NodeComponent#setDuplicateOnCloneTree
298:             */
299:            public void duplicateNode(Node originalNode, boolean forceDuplicate) {
300:                super .duplicateNode(originalNode, forceDuplicate);
301:
302:                KBRotPosScaleSplinePathInterpolator interpolator = (KBRotPosScaleSplinePathInterpolator) originalNode;
303:                setAxisOfRotPosScale(interpolator.axis);
304:                target = interpolator.target;
305:                cubicSplineCurve = new KBCubicSplineCurve(
306:                        interpolator.keyFrames);
307:                numSegments = cubicSplineCurve.numSegments;
308:            }
309:        }
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