Source Code Cross Referenced for PickCylinderSegment.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: PickCylinderSegment.java,v $
003:         *
004:         * Copyright 1999-2008 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 20:17:27 $
029:         * $State: Exp $
030:         */
031:
032:        package javax.media.j3d;
033:
034:        import javax.vecmath.*;
035:        import com.sun.j3d.internal.Distance;
036:
037:        /**
038:         * PickCylinderSegment is a finite cylindrical segment pick shape.  It can
039:         * be used as an argument to the picking methods in BranchGroup and Locale.
040:         *
041:         * @see BranchGroup#pickAll
042:         * @see Locale#pickAll
043:         *
044:         * @since Java 3D 1.2
045:         */
046:
047:        public final class PickCylinderSegment extends PickCylinder {
048:
049:            Point3d end;
050:
051:            /**
052:             * Constructs an empty PickCylinderSegment.
053:             * The origin and end points of the cylindrical segment are
054:             * initialized to (0,0,0).  The radius is initialized
055:             * to 0.
056:             */
057:            public PickCylinderSegment() {
058:                this .end = new Point3d();
059:            }
060:
061:            /**
062:             * Constructs a finite cylindrical segment pick shape from the specified
063:             * parameters.
064:             * @param origin the origin point of the cylindrical segment.
065:             * @param end the end point of the cylindrical segment.
066:             * @param radius the radius of the cylindrical segment.
067:             */
068:            public PickCylinderSegment(Point3d origin, Point3d end,
069:                    double radius) {
070:                this .origin = new Point3d(origin);
071:                this .end = new Point3d(end);
072:                this .radius = radius;
073:                calcDirection(); // calculate direction, based on start and end
074:            }
075:
076:            /**
077:             * Sets the parameters of this PickCylinderSegment to the specified values.
078:             * @param origin the origin point of the cylindrical segment.
079:             * @param end the end point of the cylindrical segment.
080:             * @param radius the radius of the cylindrical segment.
081:             */
082:            public void set(Point3d origin, Point3d end, double radius) {
083:                this .origin.set(origin);
084:                this .end.set(end);
085:                this .radius = radius;
086:                calcDirection(); // calculate direction, based on start and end
087:            }
088:
089:            /** Calculates the direction for this PickCylinderSegment, based on start
090:              and end points.
091:             */
092:            private void calcDirection() {
093:                this .direction.x = end.x - origin.x;
094:                this .direction.y = end.y - origin.y;
095:                this .direction.z = end.z - origin.z;
096:            }
097:
098:            /**
099:             * Gets the end point of this PickCylinderSegment.
100:             * @param end the Point3d object into which the end point
101:             * will be copied.
102:             */
103:            public void getEnd(Point3d end) {
104:                end.set(this .end);
105:            }
106:
107:            /**
108:             * Returns true if shape intersect with bounds.
109:             * The point of intersection is stored in pickPos.
110:             * @param bounds the bounds object to check
111:             * @param pickPos the location of the point of intersection (not used for
112:             * method. Provided for compatibility).
113:             */
114:            final boolean intersect(Bounds bounds, Point4d pickPos) {
115:                Point4d iPnt = new Point4d();
116:
117:                //
118:                // ================ BOUNDING SPHERE ================
119:                //
120:                if (bounds instanceof  BoundingSphere) {
121:                    Point3d sphCenter = ((BoundingSphere) bounds).getCenter();
122:                    double sphRadius = ((BoundingSphere) bounds).getRadius();
123:                    double sqDist = Distance.pointToSegment(sphCenter, origin,
124:                            end);
125:                    if (sqDist <= (sphRadius + radius) * (sphRadius + radius)) {
126:                        return true;
127:                    }
128:                    return false; // we are too far to intersect
129:                }
130:                //
131:                // ================ BOUNDING BOX ================
132:                //
133:                else if (bounds instanceof  BoundingBox) {
134:                    // Calculate radius of BoundingBox
135:                    Point3d lower = new Point3d();
136:                    ((BoundingBox) bounds).getLower(lower);
137:
138:                    Point3d center = ((BoundingBox) bounds).getCenter();
139:
140:                    double temp = (center.x - lower.x + radius);
141:                    double boxRadiusSquared = temp * temp;
142:                    temp = (center.y - lower.y + radius);
143:                    boxRadiusSquared += temp * temp;
144:                    temp = (center.z - lower.z + radius);
145:                    boxRadiusSquared += temp * temp;
146:
147:                    // First, see if cylinder is too far away from BoundingBox
148:                    double sqDist = Distance
149:                            .pointToSegment(center, origin, end);
150:                    if (sqDist > boxRadiusSquared) {
151:                        return false; // we are too far to intersect
152:                    } else if (sqDist < (radius * radius)) {
153:                        return true; // center is in cylinder
154:                    }
155:
156:                    // Then, see if ray intersects
157:                    if (((BoundingBox) bounds).intersect(origin, end, iPnt)) {
158:                        return true;
159:                    }
160:
161:                    // Ray does not intersect, test for distance with each edge
162:                    Point3d upper = new Point3d();
163:                    ((BoundingBox) bounds).getUpper(upper);
164:
165:                    Point3d[][] edges = {
166:                            // Top horizontal 4
167:                            { upper, new Point3d(lower.x, upper.y, upper.z) },
168:                            { new Point3d(lower.x, upper.y, upper.z),
169:                                    new Point3d(lower.x, lower.y, upper.z) },
170:                            { new Point3d(lower.x, lower.y, upper.z),
171:                                    new Point3d(upper.x, lower.y, upper.z) },
172:                            { new Point3d(upper.x, lower.y, upper.z), upper },
173:                            // Bottom horizontal 4
174:                            { lower, new Point3d(lower.x, upper.y, lower.z) },
175:                            { new Point3d(lower.x, upper.y, lower.z),
176:                                    new Point3d(upper.x, upper.y, lower.z) },
177:                            { new Point3d(upper.x, upper.y, lower.z),
178:                                    new Point3d(upper.x, lower.y, lower.z) },
179:                            { new Point3d(upper.x, lower.y, lower.z), lower },
180:                            // Vertical 4
181:                            { lower, new Point3d(lower.x, lower.y, upper.z) },
182:                            { new Point3d(lower.x, upper.y, lower.z),
183:                                    new Point3d(lower.x, upper.y, upper.z) },
184:                            { new Point3d(upper.x, upper.y, lower.z),
185:                                    new Point3d(upper.x, upper.y, upper.z) },
186:                            { new Point3d(upper.x, lower.y, lower.z),
187:                                    new Point3d(upper.x, lower.y, upper.z) } };
188:                    for (int i = 0; i < edges.length; i++) {
189:                        //	System.err.println ("Testing edge: "+edges[i][0]+" - "+edges[i][1]);
190:                        double distToEdge = Distance.segmentToSegment(origin,
191:                                end, edges[i][0], edges[i][1]);
192:                        if (distToEdge <= radius * radius) {
193:                            //	  System.err.println ("Intersects!");
194:                            return true;
195:                        }
196:                    }
197:                    return false; // Not close enough
198:                }
199:                //
200:                // ================ BOUNDING POLYTOPE ================
201:                //
202:                else if (bounds instanceof  BoundingPolytope) {
203:                    int i, j;
204:
205:                    // First, check to see if we are too far to intersect the polytope's
206:                    // bounding sphere
207:                    Point3d sphCenter = new Point3d();
208:                    BoundingSphere bsphere = new BoundingSphere(bounds);
209:
210:                    bsphere.getCenter(sphCenter);
211:                    double sphRadius = bsphere.getRadius();
212:
213:                    double sqDist = Distance.pointToSegment(sphCenter, origin,
214:                            end);
215:                    if (sqDist > (sphRadius + radius) * (sphRadius + radius)) {
216:                        return false; // we are too far to intersect
217:                    }
218:
219:                    // Now check to see if ray intersects with polytope
220:                    if (bounds.intersect(origin, direction, iPnt)) {
221:                        return true;
222:                    }
223:
224:                    // Now check distance to edges. Since we don't know a priori how
225:                    // the polytope is structured, we will cycle through. We discard edges
226:                    // when their center is not on the polytope surface.
227:                    BoundingPolytope ptope = (BoundingPolytope) bounds;
228:                    Point3d midpt = new Point3d();
229:                    double distToEdge;
230:                    for (i = 0; i < ptope.nVerts; i++) {
231:                        for (j = i; i < ptope.nVerts; i++) {
232:                            // XXXX: make BoundingPolytope.pointInPolytope available to package
233:                            // scope
234:                            midpt.x = (ptope.verts[i].x + ptope.verts[j].x) * 0.5;
235:                            midpt.y = (ptope.verts[i].y + ptope.verts[j].y) * 0.5;
236:                            midpt.z = (ptope.verts[i].z + ptope.verts[j].z) * 0.5;
237:
238:                            if (!PickCylinder.pointInPolytope(ptope, midpt.x,
239:                                    midpt.y, midpt.z)) {
240:                                continue;
241:                            }
242:                            distToEdge = Distance.segmentToSegment(origin, end,
243:                                    ptope.verts[i], ptope.verts[j]);
244:                            if (distToEdge <= radius * radius) {
245:                                return true;
246:                            }
247:                        }
248:                    }
249:                    return false;
250:                }
251:                /*
252:                else {
253:                    throw new RuntimeException("intersect method not implemented");
254:                }
255:                 */
256:                return false;
257:            }
258:
259:            // Only use within J3D.
260:            // Return a new PickCylinderSegment that is the transformed (t3d) of this
261:            // pickCylinderSegment.  
262:            PickShape transform(Transform3D t3d) {
263:
264:                PickCylinderSegment newPCS = new PickCylinderSegment();
265:
266:                newPCS.origin.x = origin.x;
267:                newPCS.origin.y = origin.y;
268:                newPCS.origin.z = origin.z;
269:                newPCS.radius = radius * t3d.getScale();
270:                newPCS.end.x = end.x;
271:                newPCS.end.y = end.y;
272:                newPCS.end.z = end.z;
273:
274:                t3d.transform(newPCS.origin);
275:                t3d.transform(newPCS.end);
276:
277:                newPCS.direction.x = newPCS.end.x - newPCS.origin.x;
278:                newPCS.direction.y = newPCS.end.y - newPCS.origin.y;
279:                newPCS.direction.z = newPCS.end.z - newPCS.origin.z;
280:                newPCS.direction.normalize();
281:
282:                return newPCS;
283:            }
284:
285:        }
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