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


001:        /*
002:         * $RCSfile: EdgeTable.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 17:20:18 $
042:         * $State: Exp $
043:         */
044:
045:        package com.sun.j3d.utils.geometry;
046:
047:        import java.util.HashMap;
048:        import java.util.Iterator;
049:        import java.util.Set;
050:        import com.sun.j3d.utils.geometry.Edge;
051:
052:        class EdgeTable {
053:
054:            private HashMap edgeTable;
055:            private static final int DEBUG = 0;
056:
057:            Integer get(int a, int b) {
058:                return (Integer) edgeTable.get(new Edge(a, b));
059:            } // End of get()
060:
061:            Integer get(Edge e) {
062:                return (Integer) edgeTable.get(e);
063:            } // End of get()
064:
065:            // This function creates a table used to connect the triangles.
066:            // Here's how it works.  If a triangle is made of indices 12,
067:            // 40, and 51, then edge(12, 40) gets 51, edge(40, 51) gets 12,
068:            // and edge(51, 12) gets 40.  This lets us quickly move from
069:            // triangle to triangle without saving a lot of extra data.
070:            EdgeTable(int triangleIndices[]) {
071:                // We'll have one edge for each vertex
072:                edgeTable = new HashMap(triangleIndices.length * 2);
073:
074:                // Fill in table
075:                Edge e;
076:                for (int t = 0; t < triangleIndices.length; t += 3) {
077:                    // Put all 3 edges of triangle into table
078:                    for (int v = 0; v < 3; v++) {
079:                        e = new Edge(triangleIndices[t + v], triangleIndices[t
080:                                + ((v + 1) % 3)]);
081:
082:                        if (edgeTable.get(e) != null) {
083:                            if ((DEBUG & 1) != 0) {
084:                                System.out
085:                                        .println("EdgeTable Error: duplicate edge ("
086:                                                + triangleIndices[t + v]
087:                                                + ", "
088:                                                + triangleIndices[t
089:                                                        + ((v + 1) % 3)] + ").");
090:                            }
091:                        } else {
092:                            // Store index of 3rd vertex (across from edge)
093:                            edgeTable.put(e, new Integer(t + ((v + 2) % 3)));
094:                        }
095:                    }
096:                }
097:
098:                if ((DEBUG & 1) != 0) {
099:                    System.out.println("Edge Table:");
100:                    Iterator list = edgeTable.keySet().iterator();
101:                    while (list.hasNext()) {
102:                        Edge edge = (Edge) list.next();
103:                        System.out.println("  (" + edge.v1 + ", " + edge.v2
104:                                + ") = " + get(edge.v1, edge.v2));
105:                    }
106:                }
107:            } // End of constructor EdgeTable
108:
109:        } // End of class EdgeTable
110:
111:        // End of file EdgeTable.java
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