Source Code Cross Referenced for MultiTransformGroup.java in  » 6.0-JDK-Modules » java-3d » com » sun » j3d » utils » universe » 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 » com.sun.j3d.utils.universe 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: MultiTransformGroup.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 17:20:44 $
042:         * $State: Exp $
043:         */
044:
045:        package com.sun.j3d.utils.universe;
046:
047:        import javax.media.j3d.*;
048:        import javax.vecmath.*;
049:
050:        /**
051:         * A convenience class that effectively creates a series of TransformGroup
052:         * nodes connected one to another hierarchically. For most applications,
053:         * creating a MultiTransformGroup containing one transform will suffice.
054:         * More sophisticated applications that use a complex portal/head tracking
055:         * viewing system may find that more transforms are needed.
056:         * <P>
057:         * When more than one transform is needed, transform[0] is considered the
058:         * "top most" transform with repsect to the scene graph, (attached to the
059:         * ViewingPlatform node) and transform[numTransforms - 1] is the "bottom
060:         * most" transform (the ViewPlatorm object is attached to this transform).
061:         */
062:        public class MultiTransformGroup {
063:
064:            // For now just have an array of TransformGroup nodes.
065:            TransformGroup[] transforms;
066:
067:            /**
068:             * Creates a MultiTransformGroup node that contains a single transform.
069:             * This is effectively equivalent to creating a single TransformGroup
070:             * node.
071:             */
072:            public MultiTransformGroup() {
073:                this (1);
074:            }
075:
076:            /**
077:             * Creates a MultiTransformGroup node that contains the specified
078:             * number of transforms.
079:             * <P>
080:             * When more than one transform is needed, transform[0] is considered the
081:             * "top most" transform with repsect to the scene graph, (attached to the
082:             * ViewingPlatform node) and transform[numTransforms - 1] is the "bottom
083:             * most" transform (the ViewPlatorm object is attached to this transform).
084:             *
085:             * @param numTransforms The number of transforms for this node to
086:             *  contain. If this number is less than one, one is assumed.
087:             */
088:            public MultiTransformGroup(int numTransforms) {
089:                if (numTransforms < 1)
090:                    numTransforms = 1;
091:
092:                transforms = new TransformGroup[numTransforms];
093:
094:                // there is always at least one TransformGroup
095:                transforms[0] = new TransformGroup();
096:                transforms[0]
097:                        .setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
098:                transforms[0]
099:                        .setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
100:                transforms[0]
101:                        .setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);
102:                transforms[0]
103:                        .setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);
104:
105:                for (int i = 1; i < numTransforms; i++) {
106:                    transforms[i] = new TransformGroup();
107:                    transforms[i]
108:                            .setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
109:                    transforms[i]
110:                            .setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
111:                    transforms[i]
112:                            .setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);
113:                    transforms[i]
114:                            .setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);
115:                    transforms[i - 1].addChild(transforms[i]);
116:                }
117:            }
118:
119:            /**
120:             * Returns the selected TransformGroup node.
121:             *
122:             * @param transform The index of the transform to return.  The indices
123:             *  are in the range [0..(n - 1)] - where n was the number of transforms
124:             *  created.  transform[0] is considered the
125:             *  "top most" transform with repsect to the scene graph, (attached to the
126:             *  ViewingPlatform node) and transform[numTransforms - 1] is the "bottom
127:             *  most" transform (the ViewPlatorm object is attached to this transform).
128:             *
129:             * @return The TransformGroup node at the designated index. If an out of
130:             *  range index is given, null is returned.
131:             */
132:            public TransformGroup getTransformGroup(int transform) {
133:                if (transform >= transforms.length || transform < 0)
134:                    return null;
135:
136:                return transforms[transform];
137:            }
138:
139:            /**
140:             * Returns the number of transforms in this MultiTransformGroup object.
141:             *
142:             * @return The number of transforms in this object.
143:             */
144:            public int getNumTransforms() {
145:                return transforms.length;
146:            }
147:
148:        }
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