/*
* @(#)YoyoLineApp.java 1.1 00/09/22 15:57
*
* Copyright (c) 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
*
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* modify and redistribute this software in source and binary code form,
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* which is disparaging to Sun.
*
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*/
/*
* Getting Started with the Java 3D API
* written in Java 3D
*
* YoyoLineApp.java demonstrates using Appearance attributes
* to display only the lines from a more complex geometry.
*/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.event.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
public class YoyoLineApp extends Applet {
/////////////////////////////////////////////////
//
// create scene graph branch group
//
public class Yoyo extends Shape3D{
////////////////////////////////////////////
//
// create Shape3D with geometry and appearance
// the geometry is created in method yoyoGeometry
// the appearance is created in method yoyoAppearance
//
public Yoyo() {
this.setGeometry(yoyoGeometry());
this.setAppearance(yoyoAppearance());
} // end of Yoyo constructor
////////////////////////////////////////////
//
// create yoyo geometry
// four triangle fans represent the yoyo
// strip indicies_______________
// 0 0N+0 to 1N+0 ( 0 to N )
// 1 1N+1 to 2N+1
// 2 2N+2 to 3N+2
// 3 3N+4 to 4N+3
//
private Geometry yoyoGeometry() {
TriangleFanArray tfa;
int N = 17;
int totalN = 4*(N+1);
Point3f coords[] = new Point3f[totalN];
int stripCounts[] = {N+1, N+1, N+1, N+1};
float r = 0.6f;
float w = 0.4f;
int n;
double a;
float x, y;
// set the central points for four triangle fan strips
coords[0*(N+1)] = new Point3f(0.0f, 0.0f, w);
coords[1*(N+1)] = new Point3f(0.0f, 0.0f, 0.0f);
coords[2*(N+1)] = new Point3f(0.0f, 0.0f, 0.0f);
coords[3*(N+1)] = new Point3f(0.0f, 0.0f, -w);
for(a = 0,n = 0; n < N; a = 2.0*Math.PI/(N-1) * ++n){
x = (float) (r * Math.cos(a));
y = (float) (r * Math.sin(a));
coords[0*(N+1)+n+1] = new Point3f(x, y, w);
coords[1*(N+1)+N-n] = new Point3f(x, y, w);
coords[2*(N+1)+n+1] = new Point3f(x, y, -w);
coords[3*(N+1)+N-n] = new Point3f(x, y, -w);
}
tfa = new TriangleFanArray (totalN,
TriangleFanArray.COORDINATES,
stripCounts);
tfa.setCoordinates(0, coords);
return tfa;
} // end of method yoyoGeometry in class Yoyo
////////////////////////////////////////////
//
// create yoyo appearance
//
private Appearance yoyoAppearance () {
Appearance appearance = new Appearance();
PolygonAttributes polyAttrib = new PolygonAttributes();
polyAttrib.setPolygonMode(PolygonAttributes.POLYGON_LINE);
appearance.setPolygonAttributes(polyAttrib);
return appearance;
} // end of method yoyoAppearance of class Yoyo
} // end of class Yoyo
/////////////////////////////////////////////////
//
// create scene graph branch group
//
public BranchGroup createSceneGraph() {
BranchGroup objRoot = new BranchGroup();
// Create the transform group node and initialize it to the
// identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at runtime. Add it to the
// root of the subgraph.
TransformGroup objSpin = new TransformGroup();
objSpin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objSpin);
objSpin.addChild(new Yoyo());
// Create a new Behavior object that will perform the desired
// operation on the specified transform object and add it into
// the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, 4000);
RotationInterpolator rotator =
new RotationInterpolator(rotationAlpha, objSpin);
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
rotator.setSchedulingBounds(bounds);
objSpin.addChild(rotator);
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
} // end of CreateSceneGraph method of YoyoLineApp
// Create a simple scene and attach it to the virtual universe
public YoyoLineApp() {
setLayout(new BorderLayout());
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);
add("Center", canvas3D);
BranchGroup scene = createSceneGraph();
// SimpleUniverse is a Convenience Utility class
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(scene);
} // end of YoyoLineApp constructor
// The following allows this to be run as an application
// as well as an applet
public static void main(String[] args) {
Frame frame = new MainFrame(new YoyoLineApp(), 256, 256);
} // end of main method of YoyoLineApp
} // end of class YoyoLineApp
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