Source Code Cross Referenced for SwitchValueInterpolator.java in  » 6.0-JDK-Modules » java-3d » javax » media » j3d » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » java 3d » javax.media.j3d 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: SwitchValueInterpolator.java,v $
003:         *
004:         * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
006:         *
007:         * This code is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU General Public License version 2 only, as
009:         * published by the Free Software Foundation.  Sun designates this
010:         * particular file as subject to the "Classpath" exception as provided
011:         * by Sun in the LICENSE file that accompanied this code.
012:         *
013:         * This code is distributed in the hope that it will be useful, but WITHOUT
014:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
015:         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
016:         * version 2 for more details (a copy is included in the LICENSE file that
017:         * accompanied this code).
018:         *
019:         * You should have received a copy of the GNU General Public License version
020:         * 2 along with this work; if not, write to the Free Software Foundation,
021:         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
022:         *
023:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
024:         * CA 95054 USA or visit www.sun.com if you need additional information or
025:         * have any questions.
026:         *
027:         * $Revision: 1.5 $
028:         * $Date: 2008/02/28 20:17:31 $
029:         * $State: Exp $
030:         */
031:
032:        package javax.media.j3d;
033:
034:        import java.util.Enumeration;
035:
036:        /**
037:         * SwitchValueInterpolator behavior.  This class defines a 
038:         * behavior that modifies the selected child of the target
039:         * switch node by linearly interpolating between a pair of
040:         * specified child index values (using the value generated
041:         * by the specified Alpha object).
042:         */
043:
044:        public class SwitchValueInterpolator extends Interpolator {
045:
046:            Switch target;
047:            int firstSwitchIndex;
048:            int lastSwitchIndex;
049:            int childCount;
050:
051:            // We can't use a boolean flag since it is possible 
052:            // that after alpha change, this procedure only run
053:            // once at alpha.finish(). So the best way is to
054:            // detect alpha value change.
055:            private float prevAlphaValue = Float.NaN;
056:            private WakeupCriterion passiveWakeupCriterion = (WakeupCriterion) new WakeupOnElapsedFrames(
057:                    0, true);
058:
059:            // non-public, default constructor used by cloneNode
060:            SwitchValueInterpolator() {
061:            }
062:
063:            /**
064:             * Constructs a SwitchValueInterpolator behavior that varies its target 
065:             * Switch node's child index between 0 and <i>n</i>-1, where <i>n</i>
066:             * is the number of children in the target Switch node.
067:             * @param alpha the alpha object for this interpolator
068:             * @param target the Switch node affected by this interpolator
069:             */
070:            public SwitchValueInterpolator(Alpha alpha, Switch target) {
071:
072:                super (alpha);
073:
074:                this .target = target;
075:                firstSwitchIndex = 0;
076:                childCount = target.numChildren();
077:                lastSwitchIndex = childCount - 1;
078:
079:            }
080:
081:            /**
082:             * Constructs a SwitchValueInterpolator behavior that varies its target 
083:             * Switch node's child index between the two values provided.
084:             * @param alpha the alpha object for this interpolator
085:             * @param target the Switch node affected by this interpolator
086:             * @param firstChildIndex the index of first child in the Switch node to
087:             * select
088:             * @param lastChildIndex the index of last child in the Switch node to
089:             * select
090:             */
091:            public SwitchValueInterpolator(Alpha alpha, Switch target,
092:                    int firstChildIndex, int lastChildIndex) {
093:
094:                super (alpha);
095:
096:                this .target = target;
097:                firstSwitchIndex = firstChildIndex;
098:                lastSwitchIndex = lastChildIndex;
099:                computeChildCount();
100:            }
101:
102:            /**
103:             * This method sets the firstChildIndex for this interpolator.
104:             * @param firstIndex the new index for the first child
105:             */
106:            public void setFirstChildIndex(int firstIndex) {
107:                firstSwitchIndex = firstIndex;
108:                computeChildCount();
109:            }
110:
111:            /**
112:             * This method retrieves this interpolator's firstChildIndex.
113:             * @return the interpolator's firstChildIndex
114:             */
115:            public int getFirstChildIndex() {
116:                return this .firstSwitchIndex;
117:            }
118:
119:            /**
120:             * This method sets the lastChildIndex for this interpolator.
121:             * @param lastIndex the new index for the last child
122:             */
123:            public void setLastChildIndex(int lastIndex) {
124:                lastSwitchIndex = lastIndex;
125:                computeChildCount();
126:            }
127:
128:            /**
129:             * This method retrieves this interpolator's lastSwitchIndex.
130:             * @return the interpolator's maximum scale value
131:             */
132:            public int getLastChildIndex() {
133:                return this .lastSwitchIndex;
134:            }
135:
136:            /**
137:             * This method sets the target for this interpolator.
138:             * @param target the target Switch node
139:             */
140:            public void setTarget(Switch target) {
141:                this .target = target;
142:            }
143:
144:            /**
145:             * This method retrieves this interpolator's target Switch node
146:             * reference.
147:             * @return the interpolator's target Switch node
148:             */
149:            public Switch getTarget() {
150:                return target;
151:            }
152:
153:            // The SwitchValueInterpolator's initialize routine uses the default 
154:            // initialization routine.
155:
156:            /**
157:             * This method is invoked by the behavior scheduler every frame.  
158:             * It maps the alpha value that corresponds to the current time
159:             * into a child index value and updates the specified Switch node
160:             * with this new child index value.
161:             * @param criteria an enumeration of the criteria that triggered
162:             * this stimulus
163:             */
164:            public void processStimulus(Enumeration criteria) {
165:                // Handle stimulus
166:                WakeupCriterion criterion = passiveWakeupCriterion;
167:
168:                if (alpha != null) {
169:                    float value = alpha.value();
170:
171:                    if (value != prevAlphaValue) {
172:                        int child;
173:
174:                        if (lastSwitchIndex > firstSwitchIndex) {
175:                            child = (int) (firstSwitchIndex + (int) (value
176:                                    * (childCount - 1) + 0.49999999999f));
177:                        } else {
178:                            child = (int) (firstSwitchIndex - (int) (value
179:                                    * (childCount - 1) + 0.49999999999f));
180:                        }
181:                        target.setWhichChild(child);
182:                        prevAlphaValue = value;
183:                    }
184:                    if (!alpha.finished() && !alpha.isPaused()) {
185:                        criterion = defaultWakeupCriterion;
186:                    }
187:                }
188:                wakeupOn(criterion);
189:            }
190:
191:            /**
192:             * calculate the number of the child to manage for this switch node 
193:             */
194:            final private void computeChildCount() {
195:                if (lastSwitchIndex >= firstSwitchIndex) {
196:                    childCount = lastSwitchIndex - firstSwitchIndex + 1;
197:                } else {
198:                    childCount = firstSwitchIndex - lastSwitchIndex + 1;
199:                }
200:            }
201:
202:            /**
203:             * Used to create a new instance of the node.  This routine is called
204:             * by <code>cloneTree</code> to duplicate the current node.
205:             * @param forceDuplicate when set to <code>true</code>, causes the
206:             *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
207:             *  <code>false</code>, the value of each node's
208:             *  <code>duplicateOnCloneTree</code> variable determines whether
209:             *  NodeComponent data is duplicated or copied.
210:             *
211:             * @see Node#cloneTree
212:             * @see Node#cloneNode
213:             * @see Node#duplicateNode
214:             * @see NodeComponent#setDuplicateOnCloneTree
215:             */
216:            public Node cloneNode(boolean forceDuplicate) {
217:                SwitchValueInterpolator svi = new SwitchValueInterpolator();
218:                svi.duplicateNode(this , forceDuplicate);
219:                return svi;
220:            }
221:
222:            /**
223:             * Copies all SwitchValueInterpolator information from
224:             * <code>originalNode</code> into
225:             * the current node.  This method is called from the
226:             * <code>cloneNode</code> method which is, in turn, called by the
227:             * <code>cloneTree</code> method.<P>
228:             *
229:             * @param originalNode the original node to duplicate.
230:             * @param forceDuplicate when set to <code>true</code>, causes the
231:             *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
232:             *  <code>false</code>, the value of each node's
233:             *  <code>duplicateOnCloneTree</code> variable determines whether
234:             *  NodeComponent data is duplicated or copied.
235:             *
236:             * @exception RestrictedAccessException if this object is part of a live
237:             *  or compiled scenegraph.
238:             *
239:             * @see Node#duplicateNode
240:             * @see Node#cloneTree
241:             * @see NodeComponent#setDuplicateOnCloneTree
242:             */
243:            void duplicateAttributes(Node originalNode, boolean forceDuplicate) {
244:                super .duplicateAttributes(originalNode, forceDuplicate);
245:
246:                SwitchValueInterpolator si = (SwitchValueInterpolator) originalNode;
247:
248:                setFirstChildIndex(si.getFirstChildIndex());
249:                setLastChildIndex(si.getLastChildIndex());
250:                // this reference will be updated in updateNodeReferences()
251:                setTarget(si.getTarget());
252:            }
253:
254:            /**
255:             * Callback used to allow a node to check if any nodes referenced
256:             * by that node have been duplicated via a call to <code>cloneTree</code>.
257:             * This method is called by <code>cloneTree</code> after all nodes in
258:             * the sub-graph have been duplicated. The cloned Leaf node's method
259:             * will be called and the Leaf node can then look up any node references
260:             * by using the <code>getNewObjectReference</code> method found in the
261:             * <code>NodeReferenceTable</code> object.  If a match is found, a
262:             * reference to the corresponding Node in the newly cloned sub-graph
263:             * is returned.  If no corresponding reference is found, either a
264:             * DanglingReferenceException is thrown or a reference to the original
265:             * node is returned depending on the value of the
266:             * <code>allowDanglingReferences</code> parameter passed in the
267:             * <code>cloneTree</code> call.
268:             * <p>
269:             * NOTE: Applications should <i>not</i> call this method directly.
270:             * It should only be called by the cloneTree method.
271:             *
272:             * @param referenceTable a NodeReferenceTableObject that contains the
273:             *  <code>getNewObjectReference</code> method needed to search for
274:             *  new object instances.
275:             * @see NodeReferenceTable
276:             * @see Node#cloneTree
277:             * @see DanglingReferenceException
278:             */
279:            public void updateNodeReferences(NodeReferenceTable referenceTable) {
280:                super .updateNodeReferences(referenceTable);
281:
282:                // check Switch
283:                Node n = getTarget();
284:
285:                if (n != null) {
286:                    setTarget((Switch) referenceTable.getNewObjectReference(n));
287:                }
288:            }
289:        }
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