333 lines
10 KiB
Java
333 lines
10 KiB
Java
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/*
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File: SceneSun.java
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University of Applied Science Berne,HTA-Biel/Bienne,
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Computer Science Department.
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Diploma thesis J3D Solar System Simulator
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Originally written by Marcel Portner & Bernhard Hari (c) 2000
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CVS - Information :
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$Header: /var/cvsreps/projects/c450/2000/sss3d/source_diploma/sss3d/contentbranch/sun/SceneSun.java,v 1.16 2000/12/15 02:53:36 portm Exp $
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$Author: portm $
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$Date: 2000/12/15 02:53:36 $
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$State: Exp $
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*/
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package sss3d.contentbranch.sun;
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import sss3d.contentbranch.*;
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import sss3d.utils.SSS3dConstants;
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import sss3d.utils.observer.*;
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import sss3d.utils.xmlparser.XMLConstants;
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import javax.media.j3d.*;
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import javax.vecmath.*;
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import com.sun.j3d.utils.behaviors.interpolators.*;
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import java.util.Date;
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import java.awt.Color;
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/**
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* This class describe the scene of the sun.
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*
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* @author Marcel Portner & Bernhard Hari
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* @version $Revision: 1.16 $
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* @see Sun
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*/
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public class SceneSun implements SceneCelestialObjects, PositionObserver, InfoObserver {
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private RotationInterpolator rotator;
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private Alpha rotationAlpha;
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private long alphaTime = 0;
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private Date date;
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private BranchGroup removableCoordBG;
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private TransformGroup trGrScaleAndLeafs;
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private TransformGroup trGrRot;
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private Sun sun;
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private ObjectsPositions objPos;
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private ObjectsInformation objInfo;
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private InitializationObject iniObject;
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/**
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* Initializes a new SceneSun.
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*
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* @param sun a object reference of the sun.
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* @param objPos a reference to the concrete subject of
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* the observer pattern positions
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* @param objInfo a reference to the concrete subject of
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* the observer pattern information
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*/
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public SceneSun(Sun sun, ObjectsPositions objPos,
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ObjectsInformation objInfo) {
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this.sun = sun;
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this.objPos = objPos;
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this.objInfo = objInfo;
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this.objPos.attach(this);
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this.objInfo.attach(this);
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this.iniObject = objInfo.getInitializationObject();
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}
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/**
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* Updates the position state of the object.<br>
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*
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* @param orbitPos a reference to the list containing all position observer
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*/
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public void update(OrbitPositions orbitPos) {
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}
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/**
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* Updates the information state of the object.<br>
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*
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* @param id identification of the object that has to be updated
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* @param parameter the parameter that has been changed
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*/
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public void update( String id, int parameter ) {
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if ( id.equals( sun.getId() ) ||
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id.equals("all") ) {
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IniData data = (IniData)objInfo.getParameter( XMLConstants.STAR, sun.getId() );
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switch ( parameter ) {
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case XMLConstants.VISIBLE :
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// implemented inside SceneSolarSystem
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break;
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case XMLConstants.COORDINATESYSTEM :
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if ( data.hasCoordinateSystem() ) {
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addCoord();
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} else {
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removeCoord();
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}
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break;
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case XMLConstants.ORBIT :
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if ( data.hasOrbit() ) {
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addOrbit();
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} else {
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removeOrbit();
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}
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break;
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case XMLConstants.COLORORBIT :
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setOrbitColor( data.getColorOrbit());
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break;
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case XMLConstants.ANIMATIONSPEED :
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setAnimSpeed();
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break;
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default : break;
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}
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}
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}
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/**
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* Removes this object from the position observer list.
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*/
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public void destroy() {
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objPos.detach(this);
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objInfo.detach(this);
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sun = null;
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}
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/**
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* Returns the ID of the sun.
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*
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* @return the ID to idendification the sun.
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*/
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public String getId() {
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return sun.getId();
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}
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/**
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* Returns a CelestialObjectInfo of the sun.
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* This object has all specific information of the sun.
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*
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* @return a CelestialObjectInfo of the sun.
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*/
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public CelestialObjectInfo getInfo() {
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return sun.getInfo();
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}
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/**
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* This method handle the rotation of the sun.
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*
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* @param animate if true, start animation; if false stop animation.
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* @param rotate if true, start rotation; if false stop rotation.
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*/
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public void setAnimation(boolean animate, boolean rotate) {
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date = new Date();
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if(animate) {
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// set the stop time for the rotation.
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alphaTime = date.getTime() - alphaTime;
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rotationAlpha.setStartTime(alphaTime);
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} else {
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// save the stop time for the rotation.
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alphaTime = rotationAlpha.getStartTime();
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alphaTime = date.getTime() - alphaTime;
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}
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// set the rotation to stop or go.
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rotator.setEnable(rotate);
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}
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/**
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* Set the animation speed for the sun.
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*/
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public void setAnimSpeed() {
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date = new Date();
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AnimationSpeed animationSpeed = (AnimationSpeed)objInfo.getInitializationObject().getParameter(XMLConstants.ANIMATIONSPEED);
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int factor = 0;
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switch(animationSpeed.getType()) {
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case AnimationSpeed.DAYS_PER_SECOND:
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factor = 1;
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break;
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case AnimationSpeed.HOURS_PER_SECOND:
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factor = 24;
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break;
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case AnimationSpeed.MINUTES_PER_SECOND:
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factor = 24 * 60;
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break;
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default:
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}
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int animSpeed = animationSpeed.getValue();
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long duration = (long)(sun.getRotOwnAxis() * factor / animSpeed);
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long increasing = rotationAlpha.getIncreasingAlphaDuration();
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// delta t = t1*(1-T2/T1)
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long diff = (long)((date.getTime() - rotationAlpha.getStartTime()) *
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(1.0f - (float)duration / (float)increasing));
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rotationAlpha.setIncreasingAlphaDuration(duration);
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rotationAlpha.setStartTime(rotationAlpha.getStartTime() + diff);
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}
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/**
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* Add the coordinate system to this scenegraph.
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*/
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public void addCoord() {
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trGrScaleAndLeafs.addChild(removableCoordBG);
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}
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/**
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* Remove the coordinate system from this scenegraph.
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*/
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public void removeCoord() {
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removableCoordBG.detach();
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}
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/**
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* The sun has no color orbit.
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*/
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public void addOrbit() {
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}
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/**
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* The sun has no color orbit.
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*/
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public void removeOrbit() {
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}
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/**
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* The sun has no color orbit.
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*/
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public void setOrbitColor(Color orbitColor) {
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}
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/**
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* Get the current position of the sun.
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*
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* @return a Transform3D with the current position.
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*/
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public Transform3D getCurrentPosition() {
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Transform3D transform = new Transform3D();
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trGrRot.getTransform(transform);
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return transform;
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}
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/**
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* Returns the BranchGroup of the created sun scene.
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* It has the sun as leaf and it make a rotation.
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*
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* @return the BranchGroup of the sun.
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*/
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public BranchGroup createSceneGraph() {
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// A BoundingSphere instance as general bounding region.
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BoundingSphere boundsGen = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
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SSS3dConstants.BOUNDRADIUS);
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// set scale of the sun
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float scale;
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if(((Boolean)iniObject.getParameter(XMLConstants.COMPRESSED)).booleanValue()) {
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scale = sun.getLogRadius();
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} else {
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scale = sun.getRadius();
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}
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Transform3D tr3Dscale = new Transform3D();
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tr3Dscale.setScale((double)scale);
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// Create the first TransformGroup node trGrScaleAndLeafs for the sun,
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// the coordinate system and the Transform3D scale.
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trGrScaleAndLeafs = new TransformGroup(tr3Dscale);
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trGrScaleAndLeafs.setCapability(Group.ALLOW_CHILDREN_READ);
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trGrScaleAndLeafs.setCapability(Group.ALLOW_CHILDREN_WRITE);
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trGrScaleAndLeafs.setCapability(Group.ALLOW_CHILDREN_EXTEND);
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// Attach the leaf node sun to the TransformGroup trGrRotAndLeafs.
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trGrScaleAndLeafs.addChild(sun); // Sphere sun
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removableCoordBG = new BranchGroup();
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// Create and attach a coordinate system to the TransformGroup node
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// trGrRotAndLeafs, that is to the sun.
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removableCoordBG.addChild(new CoordinateSystem(1.2f));
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// Allow to detach the Coordinate System
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removableCoordBG.setCapability(BranchGroup.ALLOW_DETACH);
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// Set the picking of the CoordinateSystem BranchGroup to false.
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removableCoordBG.setPickable(false);
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trGrScaleAndLeafs.addChild(removableCoordBG);
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// Create the second TransformGroup node trGrRot for the rotation
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trGrRot = new TransformGroup();
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// With the ALLOW_TRANSFORM_READ and ALLOW_TRANSFORM_WRITE
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// capabilities, we allow the modification of the TransformGroup's
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// code by the Behavior's code at run time.
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trGrRot.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
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trGrRot.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
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// Attach the trGrScaleAndLeafs node to the trGrRot node.
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trGrRot.addChild(trGrScaleAndLeafs);
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// Prepare the RotationInterpolator (Behavior) for the
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// sun's rotation about its own axis.
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// Create the alpha(t) function.
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rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0,
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/*sun.getRotOwnAxis()*/Long.MAX_VALUE, 0, 0, 0, 0, 0);
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// Create the sun's rotation about its own axis.
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rotator = new RotationInterpolator(rotationAlpha, trGrRot);
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rotator.setSchedulingBounds(boundsGen);
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trGrRot.addChild(rotator);
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BranchGroup brGrAll = new BranchGroup();
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brGrAll.addChild(trGrRot);
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brGrAll.setCapability(BranchGroup.ALLOW_DETACH);
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// Return the final version of the BranchGroup node brGrAll.
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return brGrAll;
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}
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}
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