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/Users/lyon/j4p/src/j3d/yoyo/YoyoApp.java
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1 package j3d.yoyo;
2
3 /*
4 * @(#)YoyoApp.java 1.1 00/09/22 15:57
5 *
6 * Copyright (c) 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
7 *
8 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
9 * modify and redistribute this software in source and binary code form,
10 * provided that i) this copyright notice and license appear on all copies of
11 * the software; and ii) Licensee does not utilize the software in a manner
12 * which is disparaging to Sun.
13 *
14 * This software is provided "AS IS," without a warranty of any kind. ALL
15 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
16 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
17 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
18 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
19 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
20 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
21 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
22 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
23 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGES.
25 *
26 * This software is not designed or intended for use in on-line control of
27 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
28 * the design, construction, operation or maintenance of any nuclear
29 * facility. Licensee represents and warrants that it will not use or
30 * redistribute the Software for such purposes.
31 */
32
33
34 /*
35 * Getting Started with the Java 3D API
36 * written in Java 3D
37 */
38
39 import com.sun.j3d.utils.applet.MainFrame;
40 import com.sun.j3d.utils.universe.SimpleUniverse;
41
42 import javax.media.j3d.*;
43 import javax.vecmath.Point3d;
44 import javax.vecmath.Point3f;
45 import java.applet.Applet;
46 import java.awt.*;
47
48
49 public class YoyoApp extends Applet {
50
51 /////////////////////////////////////////////////
52 //
53 // create scene graph branch group
54 //
55 public class Yoyo extends Shape3D {
56
57 ////////////////////////////////////////////
58 //
59 // create Shape3D with geometry and appearance
60 // the geometry is created in method yoyoGeometry
61 // the appearance is created in method yoyoAppearance
62 //
63 public Yoyo() {
64
65 this.setGeometry(yoyoGeometry());
66
67 } // end of Yoyo constructor
68
69 ////////////////////////////////////////////
70 //
71 // create yoyo geometry
72 // four triangle fans represent the yoyo
73 // strip indicies_______________
74 // 0 0N+0 to 1N+0 ( 0 to N )
75 // 1 1N+1 to 2N+1
76 // 2 2N+2 to 3N+2
77 // 3 3N+4 to 4N+3
78 //
79 private Geometry yoyoGeometry() {
80
81 TriangleFanArray tfa;
82 int N = 17;
83 int totalN = 4 * (N + 1);
84 Point3f coords[] = new Point3f[totalN];
85 int stripCounts[] = {N + 1, N + 1, N + 1, N + 1};
86 float r = 0.6f;
87 float w = 0.4f;
88 int n;
89 double a;
90 float x, y;
91
92 // set the central points for four triangle fan strips
93 coords[0 * (N + 1)] = new Point3f(0.0f, 0.0f, w);
94 coords[1 * (N + 1)] = new Point3f(0.0f, 0.0f, 0.0f);
95 coords[2 * (N + 1)] = new Point3f(0.0f, 0.0f, 0.0f);
96 coords[3 * (N + 1)] = new Point3f(0.0f, 0.0f, -w);
97
98 for (a = 0, n = 0; n < N; a = 2.0 * Math.PI / (N - 1) * ++n) {
99 x = (float) (r * Math.cos(a));
100 y = (float) (r * Math.sin(a));
101 coords[0 * (N + 1) + n + 1] = new Point3f(x, y, w);
102 coords[1 * (N + 1) + N - n] = new Point3f(x, y, w);
103 coords[2 * (N + 1) + n + 1] = new Point3f(x, y, -w);
104 coords[3 * (N + 1) + N - n] = new Point3f(x, y, -w);
105 }
106
107 tfa = new TriangleFanArray(totalN,
108 TriangleFanArray.COORDINATES,
109 stripCounts);
110
111 tfa.setCoordinates(0, coords);
112
113 return tfa;
114
115 } // end of method yoyoGeometry in class Yoyo
116
117
118 } // end of class Yoyo
119
120 /////////////////////////////////////////////////
121 //
122 // create scene graph branch group
123 //
124 public BranchGroup createSceneGraph() {
125
126 BranchGroup objRoot = new BranchGroup();
127
128 // Create the transform group node and initialize it to the
129 // identity. Enable the TRANSFORM_WRITE capability so that
130 // our behavior code can modify it at runtime. Add it to the
131 // root of the subgraph.
132 TransformGroup objSpin = new TransformGroup();
133 objSpin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
134
135 objRoot.addChild(objSpin);
136
137 objSpin.addChild(new Yoyo());
138
139 // Create a new Behavior object that will perform the desired
140 // operation on the specified transform object and add it into
141 // the scene graph.
142 Transform3D yAxis = new Transform3D();
143 Alpha rotationAlpha = new Alpha(-1, 4000);
144
145 RotationInterpolator rotator =
146 new RotationInterpolator(rotationAlpha, objSpin);
147 BoundingSphere bounds =
148 new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
149 rotator.setSchedulingBounds(bounds);
150 objSpin.addChild(rotator);
151
152 // Let Java 3D perform optimizations on this scene graph.
153 objRoot.compile();
154
155 return objRoot;
156 } // end of CreateSceneGraph method of YoyoApp
157
158 // Create a simple scene and attach it to the virtual universe
159
160 public YoyoApp() {
161 setLayout(new BorderLayout());
162 GraphicsConfiguration config =
163 SimpleUniverse.getPreferredConfiguration();
164
165 Canvas3D canvas3D = new Canvas3D(config);
166 add("Center", canvas3D);
167
168 BranchGroup scene = createSceneGraph();
169
170 // SimpleUniverse is a Convenience Utility class
171 SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
172
173 // This will move the ViewPlatform back a bit so the
174 // objects in the scene can be viewed.
175 simpleU.getViewingPlatform().setNominalViewingTransform();
176
177 simpleU.addBranchGraph(scene);
178 } // end of YoyoApp constructor
179
180 // The following allows this to be run as an application
181 // as well as an applet
182
183 public static void main(String[] args) {
184 Frame frame = new MainFrame(new YoyoApp(), 256, 256);
185 } // end of main method of YoyoApp
186
187 } // end of class YoyoApp
188