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


001:        /*
002:         * $RCSfile: SensorBeamEcho.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 17:20:14 $
042:         * $State: Exp $
043:         */
044:
045:        package com.sun.j3d.utils.behaviors.sensor;
046:
047:        import javax.media.j3d.Shape3D;
048:        import javax.media.j3d.Material;
049:        import javax.media.j3d.Appearance;
050:        import javax.media.j3d.Transform3D;
051:        import javax.media.j3d.GeometryArray;
052:        import javax.media.j3d.TriangleStripArray;
053:        import javax.media.j3d.TransparencyAttributes;
054:        import javax.vecmath.AxisAngle4f;
055:        import javax.vecmath.Point3d;
056:        import javax.vecmath.Point3f;
057:        import javax.vecmath.Vector3f;
058:
059:        /**
060:         * A Shape3D representing a beam pointing from the origin of a
061:         * sensor's local coordinate system to its hotspot.
062:         * 
063:         * @since Java 3D 1.3
064:         */
065:        public class SensorBeamEcho extends Shape3D {
066:            /**
067:             * Creates a SensorBeamEcho.  Read and write capabilities are granted
068:             * for the Appearance, Material, TransparencyAttributes, and 
069:             * TransparencyAttributes mode and value.
070:             * 
071:             * @param hotspot location of the sensor's hotspot in the sensor's
072:             *  local coordinate system; this must not be (0, 0, 0)
073:             * @param baseWidth width of the beam in meters
074:             * @param enableLighting boolean indicating whether normals should be
075:             *  generated and lighting enabled
076:             * @exception IllegalArgumentException if hotspot is (0, 0, 0)
077:             */
078:            public SensorBeamEcho(Point3d hotspot, double baseWidth,
079:                    boolean enableLighting) {
080:                super ();
081:
082:                if (hotspot.distance(new Point3d()) == 0.0)
083:                    throw new IllegalArgumentException(
084:                            "\nBeam echo can't have hotspot at origin");
085:
086:                Vector3f axis = new Vector3f((float) hotspot.x,
087:                        (float) hotspot.y, (float) hotspot.z);
088:
089:                Vector3f axis1 = new Vector3f();
090:                axis1.normalize(axis);
091:
092:                // Choose an arbitrary vector normal to the beam axis.
093:                Vector3f normal = new Vector3f(0.0f, 1.0f, 0.0f);
094:                normal.cross(axis1, normal);
095:                if (normal.lengthSquared() < 0.5f) {
096:                    normal.set(0.0f, 0.0f, 1.0f);
097:                    normal.cross(axis1, normal);
098:                }
099:                normal.normalize();
100:
101:                // Create cap vertices and normals.
102:                int divisions = 18;
103:                Point3f[] cap0 = new Point3f[divisions];
104:                Point3f[] cap1 = new Point3f[divisions];
105:                Vector3f[] capNormals = new Vector3f[divisions];
106:                Vector3f cap0Normal = new Vector3f(axis1);
107:                Vector3f cap1Normal = new Vector3f(axis1);
108:                cap0Normal.negate();
109:
110:                AxisAngle4f aa4f = new AxisAngle4f(axis1, -(float) Math.PI
111:                        / ((float) divisions / 2.0f));
112:                Transform3D t3d = new Transform3D();
113:                t3d.set(aa4f);
114:
115:                float halfWidth = (float) baseWidth / 2.0f;
116:                for (int i = 0; i < divisions; i++) {
117:                    capNormals[i] = new Vector3f(normal);
118:                    cap0[i] = new Point3f(normal);
119:                    cap0[i].scale(halfWidth);
120:                    cap1[i] = new Point3f(cap0[i]);
121:                    cap1[i].add(axis);
122:                    t3d.transform(normal);
123:                }
124:
125:                // The beam cylinder is created with 3 triangle strips.  The first
126:                // strip contains the side facets (2 + 2*divisions vertices), and
127:                // the other two strips are the caps (divisions vertices each).
128:                int vertexCount = 2 + (4 * divisions);
129:                Point3f[] vertices = new Point3f[vertexCount];
130:                Vector3f[] normals = new Vector3f[vertexCount];
131:
132:                // Side facets.
133:                for (int i = 0; i < divisions; i++) {
134:                    vertices[i * 2] = cap0[i];
135:                    vertices[(i * 2) + 1] = cap1[i];
136:
137:                    normals[i * 2] = capNormals[i];
138:                    normals[(i * 2) + 1] = capNormals[i];
139:                }
140:
141:                vertices[divisions * 2] = cap0[0];
142:                vertices[(divisions * 2) + 1] = cap1[0];
143:
144:                normals[divisions * 2] = capNormals[0];
145:                normals[(divisions * 2) + 1] = capNormals[0];
146:
147:                // Strips for caps created by criss-crossing the interior.
148:                int v = (divisions + 1) * 2;
149:                vertices[v] = cap0[0];
150:                normals[v++] = cap0Normal;
151:
152:                int j = 1;
153:                int k = divisions - 1;
154:                while (j <= k) {
155:                    vertices[v] = cap0[j++];
156:                    normals[v++] = cap0Normal;
157:                    if (j > k)
158:                        break;
159:                    vertices[v] = cap0[k--];
160:                    normals[v++] = cap0Normal;
161:                }
162:
163:                vertices[v] = cap1[0];
164:                normals[v++] = cap1Normal;
165:
166:                j = 1;
167:                k = divisions - 1;
168:                while (j <= k) {
169:                    vertices[v] = cap1[k--];
170:                    normals[v++] = cap1Normal;
171:                    if (j > k)
172:                        break;
173:                    vertices[v] = cap1[j++];
174:                    normals[v++] = cap1Normal;
175:                }
176:
177:                // Create the TriangleStripArray.
178:                int vertexFormat;
179:                Material m = new Material();
180:                m.setCapability(Material.ALLOW_COMPONENT_READ);
181:                m.setCapability(Material.ALLOW_COMPONENT_WRITE);
182:
183:                if (enableLighting) {
184:                    vertexFormat = GeometryArray.COORDINATES
185:                            | GeometryArray.NORMALS;
186:                    m.setLightingEnable(true);
187:                } else {
188:                    vertexFormat = GeometryArray.COORDINATES;
189:                    m.setLightingEnable(false);
190:                }
191:
192:                int[] stripCounts = new int[3];
193:                stripCounts[0] = 2 + (2 * divisions);
194:                stripCounts[1] = divisions;
195:                stripCounts[2] = divisions;
196:
197:                TriangleStripArray tsa = new TriangleStripArray(vertexCount,
198:                        vertexFormat, stripCounts);
199:
200:                tsa.setCoordinates(0, vertices);
201:                if (enableLighting)
202:                    tsa.setNormals(0, normals);
203:
204:                Appearance a = new Appearance();
205:                a.setMaterial(m);
206:                a.setCapability(Appearance.ALLOW_MATERIAL_READ);
207:                a.setCapability(Appearance.ALLOW_MATERIAL_WRITE);
208:
209:                TransparencyAttributes ta = new TransparencyAttributes();
210:                ta.setCapability(TransparencyAttributes.ALLOW_MODE_READ);
211:                ta.setCapability(TransparencyAttributes.ALLOW_MODE_WRITE);
212:                ta.setCapability(TransparencyAttributes.ALLOW_VALUE_READ);
213:                ta.setCapability(TransparencyAttributes.ALLOW_VALUE_WRITE);
214:                ta
215:                        .setCapability(TransparencyAttributes.ALLOW_BLEND_FUNCTION_READ);
216:                ta
217:                        .setCapability(TransparencyAttributes.ALLOW_BLEND_FUNCTION_WRITE);
218:
219:                a.setTransparencyAttributes(ta);
220:                a.setCapability(Appearance.ALLOW_TRANSPARENCY_ATTRIBUTES_READ);
221:                a.setCapability(Appearance.ALLOW_TRANSPARENCY_ATTRIBUTES_WRITE);
222:
223:                setGeometry(tsa);
224:                setAppearance(a);
225:
226:                setCapability(ALLOW_APPEARANCE_READ);
227:                setCapability(ALLOW_APPEARANCE_WRITE);
228:            }
229:        }
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