Source Code Cross Referenced for TransformGroup.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: TransformGroup.java,v $
003:         *
004:         * Copyright 1996-2008 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: 1.7 $
028:         * $Date: 2008/02/28 20:17:32 $
029:         * $State: Exp $
030:         */
031:
032:        package javax.media.j3d;
033:
034:        /**
035:         * Group node that contains a transform. The TransformGroup node 
036:         * specifies a single spatial transformation, via a Transform3D
037:         * object, that can position, orient, and scale all of its children.
038:         * <P>
039:         * The specified transformation must be affine. Further, if the 
040:         * TransformGroup node is used as an ancestor of a ViewPlatform node 
041:         * in the scene graph, the transformation must be congruent-only 
042:         * rotations, translations, and uniform scales are allowed in
043:         * a direct path from a Locale to a ViewPlatform node.
044:         * <P>
045:         * Note: Even though arbitrary affine transformations are
046:         * allowed, better performance will result if all matrices
047:         * within a branch graph are congruent, containing only rotations
048:         * translation, and uniform scale.
049:         * <P>
050:         * The effects of transformations in the scene graph are cumulative. 
051:         * The concatenation of the transformations of each TransformGroup in 
052:         * a direct path from the Locale to a Leaf node defines a composite 
053:         * model transformation (CMT) that takes points in that Leaf node's 
054:         * local coordinates and transforms them into Virtual World (Vworld) 
055:         * coordinates. This composite transformation is used to
056:         * transform points, normals, and distances into Vworld coordinates. 
057:         * Points are transformed by the CMT. Normals are transformed by the 
058:         * inverse-transpose of the CMT. Distances are transformed by the scale 
059:         * of the CMT. In the case of a transformation containing a nonuniform 
060:         * scale or shear, the maximum scale value in
061:         * any direction is used. This ensures, for example, that a transformed 
062:         * bounding sphere, which is specified as a point and a radius, 
063:         * continues to enclose all objects that are also transformed using 
064:         * a nonuniform scale.
065:         * <P>
066:         */
067:
068:        public class TransformGroup extends Group {
069:            /**
070:             * Specifies that the node allows access to 
071:             * its object's transform information.
072:             */
073:            public static final int ALLOW_TRANSFORM_READ = CapabilityBits.TRANSFORM_GROUP_ALLOW_TRANSFORM_READ;
074:
075:            /**
076:             * Specifies that the node allows writing 
077:             * its object's transform information.
078:             */
079:            public static final int ALLOW_TRANSFORM_WRITE = CapabilityBits.TRANSFORM_GROUP_ALLOW_TRANSFORM_WRITE;
080:
081:            // Array for setting default read capabilities
082:            private static final int[] readCapabilities = { ALLOW_TRANSFORM_READ };
083:
084:            /**
085:             * Constructs and initializes a TransformGroup using an
086:             * identity transform.
087:             */
088:            public TransformGroup() {
089:                // set default read capabilities
090:                setDefaultReadCapabilities(readCapabilities);
091:            }
092:
093:            /**
094:             * Constructs and initializes a TransformGroup from
095:             * the Transform passed.
096:             * @param t1 the transform3D object
097:             * @exception BadTransformException if the transform is not affine.
098:             */
099:            public TransformGroup(Transform3D t1) {
100:                if (!t1.isAffine()) {
101:                    throw new BadTransformException(J3dI18N
102:                            .getString("TransformGroup0"));
103:                }
104:
105:                // set default read capabilities
106:                setDefaultReadCapabilities(readCapabilities);
107:
108:                ((TransformGroupRetained) this .retained).setTransform(t1);
109:            }
110:
111:            /**
112:             * Creates the retained mode TransformGroupRetained object that this
113:             * TransformGroup object will point to.
114:             */
115:            void createRetained() {
116:                this .retained = new TransformGroupRetained();
117:                this .retained.setSource(this );
118:            }
119:
120:            /**
121:             * Sets the transform component of this TransformGroup to the value of
122:             * the passed transform.
123:             * @param t1 the transform to be copied
124:             * @exception CapabilityNotSetException if appropriate capability is
125:             * not set and this object is part of live or compiled scene graph
126:             * @exception BadTransformException if the transform is not affine.
127:             */
128:            public void setTransform(Transform3D t1) {
129:                if (isLiveOrCompiled())
130:                    if (!this .getCapability(ALLOW_TRANSFORM_WRITE))
131:                        throw new CapabilityNotSetException(J3dI18N
132:                                .getString("TransformGroup1"));
133:
134:                if (!t1.isAffine()) {
135:                    throw new BadTransformException(J3dI18N
136:                            .getString("TransformGroup0"));
137:                }
138:
139:                ((TransformGroupRetained) this .retained).setTransform(t1);
140:            }
141:
142:            /**
143:             * Copies the transform component of this TransformGroup into
144:             * the passed transform object.
145:             * @param t1 the transform object to be copied into
146:             * @exception CapabilityNotSetException if appropriate capability is
147:             * not set and this object is part of live or compiled scene graph
148:             */
149:            public void getTransform(Transform3D t1) {
150:                if (isLiveOrCompiled())
151:                    if (!this .getCapability(ALLOW_TRANSFORM_READ))
152:                        throw new CapabilityNotSetException(J3dI18N
153:                                .getString("TransformGroup2"));
154:
155:                ((TransformGroupRetained) this .retained).getTransform(t1);
156:            }
157:
158:            /**
159:             * Creates a new instance of the node.  This routine is called
160:             * by <code>cloneTree</code> to duplicate the current node.
161:             * @param forceDuplicate when set to <code>true</code>, causes the
162:             *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
163:             *  <code>false</code>, the value of each node's
164:             *  <code>duplicateOnCloneTree</code> variable determines whether
165:             *  NodeComponent data is duplicated or copied.
166:             *
167:             * @see Node#cloneTree
168:             * @see Node#cloneNode
169:             * @see Node#duplicateNode
170:             * @see NodeComponent#setDuplicateOnCloneTree
171:             */
172:            public Node cloneNode(boolean forceDuplicate) {
173:                TransformGroup tg = new TransformGroup();
174:                tg.duplicateNode(this , forceDuplicate);
175:                return tg;
176:            }
177:
178:            /**
179:             * Copies all TransformGroup information from
180:             * <code>originalNode</code> into
181:             * the current node.  This method is called from the
182:             * <code>cloneNode</code> method which is, in turn, called by the
183:             * <code>cloneTree</code> method.<P> 
184:             *
185:             * @param originalNode the original node to duplicate.
186:             * @param forceDuplicate when set to <code>true</code>, causes the
187:             *  <code>duplicateOnCloneTree</code> flag to be ignored.  When
188:             *  <code>false</code>, the value of each node's
189:             *  <code>duplicateOnCloneTree</code> variable determines whether
190:             *  NodeComponent data is duplicated or copied.
191:             *
192:             * @exception RestrictedAccessException if this object is part of a live
193:             *  or compiled scenegraph.
194:             *
195:             * @see Node#duplicateNode
196:             * @see Node#cloneTree
197:             * @see NodeComponent#setDuplicateOnCloneTree
198:             */
199:            void duplicateAttributes(Node originalNode, boolean forceDuplicate) {
200:                super .duplicateAttributes(originalNode, forceDuplicate);
201:
202:                Transform3D t = new Transform3D();
203:                ((TransformGroupRetained) originalNode.retained)
204:                        .getTransform(t);
205:                ((TransformGroupRetained) retained).setTransform(t);
206:            }
207:        }
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