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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: PickConeSegment.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:         * PickConeSegment is a finite cone 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:        public final class PickConeSegment extends PickCone {
047:
048:            Point3d end;
049:
050:            /**
051:             * Constructs an empty PickConeSegment.
052:             * The origin and end point of the cone are
053:             * initialized to (0,0,0).  The spread angle is initialized
054:             * to <code>PI/64</code> radians.
055:             */
056:            public PickConeSegment() {
057:                end = new Point3d();
058:            }
059:
060:            /**
061:             * Constructs a finite cone pick shape from the specified
062:             * parameters.
063:             * @param origin the origin of the cone
064:             * @param end the end of the cone along the direction vector
065:             * @param spreadAngle the spread angle of the cone in radians
066:             */
067:            public PickConeSegment(Point3d origin, Point3d end,
068:                    double spreadAngle) {
069:                this .origin = new Point3d(origin);
070:                this .end = new Point3d(end);
071:                this .direction = new Vector3d();
072:                this .spreadAngle = spreadAngle;
073:                calcDirection(); // calculate direction, based on start and end
074:            }
075:
076:            /**
077:             * Sets the parameters of this PickCone to the specified values.
078:             * @param origin the origin of the cone
079:             * @param end the end of the cone
080:             * @param spreadAngle the spread angle of the cone in radians
081:             */
082:            public void set(Point3d origin, Point3d end, double spreadAngle) {
083:                this .origin.set(origin);
084:                this .end.set(end);
085:                this .spreadAngle = spreadAngle;
086:                calcDirection(); // calculate direction, based on start and end
087:            }
088:
089:            /**
090:             * Gets the end point of this PickConeSegment.
091:             * @param end the Point3d object into which the end point
092:             * will be copied.
093:             */
094:            public void getEnd(Point3d end) {
095:                end.set(this .end);
096:            }
097:
098:            /** Calculates the direction for this PickCylinderSegment, based on start
099:              and end points.
100:             */
101:            private void calcDirection() {
102:                this .direction.x = end.x - origin.x;
103:                this .direction.y = end.y - origin.y;
104:                this .direction.z = end.z - origin.z;
105:            }
106:
107:            /**
108:             * Return 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:                Vector3d vector = new Vector3d();
117:                Point3d rayPt = new Point3d();
118:
119:                double distance;
120:                double radius;
121:
122:                //
123:                // ================ BOUNDING SPHERE ================
124:                //
125:                if (bounds instanceof  BoundingSphere) {
126:                    Point3d sphCenter = ((BoundingSphere) bounds).getCenter();
127:                    double sphRadius = ((BoundingSphere) bounds).getRadius();
128:                    double sqDist = Distance.pointToSegment(sphCenter, origin,
129:                            end, rayPt, null);
130:
131:                    vector.sub(rayPt, origin);
132:                    distance = vector.length();
133:                    radius = getRadius(distance);
134:                    if (sqDist <= (sphRadius + radius) * (sphRadius + radius)) {
135:                        return true;
136:                    }
137:                    return false; // we are too far to intersect
138:                }
139:                //
140:                // ================ BOUNDING BOX ================
141:                //
142:                else if (bounds instanceof  BoundingBox) {
143:                    // Calculate radius of BoundingBox
144:                    Point3d lower = new Point3d();
145:                    ((BoundingBox) bounds).getLower(lower);
146:
147:                    Point3d center = ((BoundingBox) bounds).getCenter();
148:
149:                    // First, see if cone is too far away from BoundingBox
150:                    double sqDist = Distance.pointToSegment(center, origin,
151:                            end, rayPt, null);
152:
153:                    vector.sub(rayPt, origin);
154:                    distance = vector.length();
155:                    radius = getRadius(distance);
156:
157:                    double temp = (center.x - lower.x + radius);
158:                    double boxRadiusSquared = temp * temp;
159:                    temp = (center.y - lower.y + radius);
160:                    boxRadiusSquared += temp * temp;
161:                    temp = (center.z - lower.z + radius);
162:                    boxRadiusSquared += temp * temp;
163:
164:                    if (sqDist > boxRadiusSquared) {
165:                        return false; // we are too far to intersect
166:                    } else if (sqDist < (radius * radius)) {
167:                        return true; // center is in cone
168:                    }
169:
170:                    // Then, see if ray intersects
171:                    if (((BoundingBox) bounds).intersect(origin, direction,
172:                            iPnt)) {
173:                        return true;
174:                    }
175:
176:                    // Ray does not intersect, test for distance with each edge
177:                    Point3d upper = new Point3d();
178:                    ((BoundingBox) bounds).getUpper(upper);
179:
180:                    Point3d[][] edges = {
181:                            // Top horizontal 4
182:                            { upper, new Point3d(lower.x, upper.y, upper.z) },
183:                            { new Point3d(lower.x, upper.y, upper.z),
184:                                    new Point3d(lower.x, lower.y, upper.z) },
185:                            { new Point3d(lower.x, lower.y, upper.z),
186:                                    new Point3d(upper.x, lower.y, upper.z) },
187:                            { new Point3d(upper.x, lower.y, upper.z), upper },
188:                            // Bottom horizontal 4
189:                            { lower, new Point3d(lower.x, upper.y, lower.z) },
190:                            { new Point3d(lower.x, upper.y, lower.z),
191:                                    new Point3d(upper.x, upper.y, lower.z) },
192:                            { new Point3d(upper.x, upper.y, lower.z),
193:                                    new Point3d(upper.x, lower.y, lower.z) },
194:                            { new Point3d(upper.x, lower.y, lower.z), lower },
195:                            // Vertical 4
196:                            { lower, new Point3d(lower.x, lower.y, upper.z) },
197:                            { new Point3d(lower.x, upper.y, lower.z),
198:                                    new Point3d(lower.x, upper.y, upper.z) },
199:                            { new Point3d(upper.x, upper.y, lower.z),
200:                                    new Point3d(upper.x, upper.y, upper.z) },
201:                            { new Point3d(upper.x, lower.y, lower.z),
202:                                    new Point3d(upper.x, lower.y, upper.z) } };
203:                    for (int i = 0; i < edges.length; i++) {
204:                        //	System.err.println ("Testing edge: "+edges[i][0]+" - "+edges[i][1]);
205:                        double distToEdge = Distance.segmentToSegment(origin,
206:                                end, edges[i][0], edges[i][1], rayPt, null,
207:                                null);
208:
209:                        vector.sub(rayPt, origin);
210:                        distance = vector.length();
211:                        radius = getRadius(distance);
212:                        /* System.err.println ("PickConeSegment: distance: " +
213:                           distance+" radius: " + radius +
214:                           " distToEdge:" +Math.sqrt(distToEdge));
215:                         */
216:
217:                        if (distToEdge <= radius * radius) {
218:                            //	  System.err.println ("Intersects!");
219:                            return true;
220:                        }
221:                    }
222:                    return false; // Not close enough
223:                }
224:                //
225:                // ================ BOUNDING POLYTOPE ================
226:                //
227:                else if (bounds instanceof  BoundingPolytope) {
228:                    int i, j;
229:
230:                    // First, check to see if we are too far to intersect the polytope's
231:                    // bounding sphere
232:                    Point3d sphCenter = new Point3d();
233:                    BoundingSphere bsphere = new BoundingSphere(bounds);
234:
235:                    bsphere.getCenter(sphCenter);
236:                    double sphRadius = bsphere.getRadius();
237:
238:                    double sqDist = Distance.pointToSegment(sphCenter, origin,
239:                            end, rayPt, null);
240:
241:                    vector.sub(rayPt, origin);
242:                    distance = vector.length();
243:                    radius = getRadius(distance);
244:
245:                    if (sqDist > (sphRadius + radius) * (sphRadius + radius)) {
246:                        return false; // we are too far to intersect
247:                    }
248:
249:                    // Now check to see if ray intersects with polytope
250:                    if (bounds.intersect(origin, direction, iPnt)) {
251:                        return true;
252:                    }
253:
254:                    // Now check distance to edges. Since we don't know a priori how
255:                    // the polytope is structured, we will cycle through. We discard edges
256:                    // when their center is not on the polytope surface.
257:                    BoundingPolytope ptope = (BoundingPolytope) bounds;
258:                    Point3d midpt = new Point3d();
259:                    double distToEdge;
260:                    for (i = 0; i < ptope.nVerts; i++) {
261:                        for (j = i; i < ptope.nVerts; i++) {
262:                            // XXXX: make BoundingPolytope.pointInPolytope available to package
263:                            // scope
264:                            midpt.x = (ptope.verts[i].x + ptope.verts[j].x) * 0.5;
265:                            midpt.y = (ptope.verts[i].y + ptope.verts[j].y) * 0.5;
266:                            midpt.z = (ptope.verts[i].z + ptope.verts[j].z) * 0.5;
267:
268:                            if (!PickCylinder.pointInPolytope(ptope, midpt.x,
269:                                    midpt.y, midpt.z)) {
270:                                continue;
271:                            }
272:                            distToEdge = Distance.segmentToSegment(origin, end,
273:                                    ptope.verts[i], ptope.verts[j], rayPt,
274:                                    null, null);
275:                            vector.sub(rayPt, origin);
276:                            distance = vector.length();
277:                            radius = getRadius(distance);
278:                            if (distToEdge <= radius * radius) {
279:                                return true;
280:                            }
281:                        }
282:                    }
283:                    return false;
284:                }
285:                /*
286:                else {
287:                    throw new RuntimeException("intersect method not implemented");
288:                }
289:                 */
290:                return false;
291:            }
292:
293:            // Only use within J3D.
294:            // Return a new PickConeSegment that is the transformed (t3d) of this pickConeSegment.  
295:            PickShape transform(Transform3D t3d) {
296:
297:                PickConeSegment newPCS = new PickConeSegment();
298:
299:                newPCS.origin.x = origin.x;
300:                newPCS.origin.y = origin.y;
301:                newPCS.origin.z = origin.z;
302:                newPCS.spreadAngle = spreadAngle;
303:                newPCS.end.x = end.x;
304:                newPCS.end.y = end.y;
305:                newPCS.end.z = end.z;
306:
307:                t3d.transform(newPCS.origin);
308:                t3d.transform(newPCS.end);
309:
310:                newPCS.direction.x = newPCS.end.x - newPCS.origin.x;
311:                newPCS.direction.y = newPCS.end.y - newPCS.origin.y;
312:                newPCS.direction.z = newPCS.end.z - newPCS.origin.z;
313:                newPCS.direction.normalize();
314:
315:                return newPCS;
316:            }
317:        }
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