96 lines
2.8 KiB
Java
96 lines
2.8 KiB
Java
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/*
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File: RocketSpeed.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/rockets/RocketSpeed.java,v 1.3 2000/12/12 15:37:07 harib Exp $
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$Author: harib $
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$Date: 2000/12/12 15:37:07 $
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$State: Exp $
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*/
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package sss3d.contentbranch.rockets;
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import java.util.Enumeration;
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import javax.vecmath.*;
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import javax.media.j3d.*;
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/**
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* This class is a behavior to control the speed
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* of a rocket.
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*
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* @author Marcel Portner & Bernhard Hari
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* @version $Revision: 1.3 $
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*/
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public class RocketSpeed extends Behavior {
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private Rocket rocket;
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/**
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* The TransformGroup node to modify by the keyboard interaction.
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*/
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private TransformGroup new_tgControl;
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/**
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* Wake up event on a elapsed frame.
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*/
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private WakeupOnElapsedFrames wakeUpFrame = new WakeupOnElapsedFrames(0);
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private Transform3D t3dView = new Transform3D();
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private Vector3f v3fTrans = new Vector3f();
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private Vector3f v3fTemp = new Vector3f();
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private Matrix3f m3fRot = new Matrix3f();
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/**
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* Constructor that allows to specify the desired target transform group.
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*
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* @param targetTG the target transform group
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* @param rocket an object reference to the controlled rocket
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*/
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public RocketSpeed(TransformGroup targetTG, Rocket rocket) {
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new_tgControl = targetTG;
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this.rocket = rocket;
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}
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/**
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* Override Behavior's initialize method to setup wakeup criteria.
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*/
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public void initialize() {
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wakeupOn(wakeUpFrame);
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}
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/**
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* Override Behavior's stimulus method to handle the event.
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* This method is called each time when a new frame is painted and
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* operates on the specified transform group to move the rocket position.
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*
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* @param criteria a enumeration - list. This will be passed by the system.
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*/
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public void processStimulus(Enumeration criteria) {
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if(criteria.hasMoreElements()) {
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// wake up on elapsed frames...
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if(rocket.getSpeedFactor() != 0.0f) {
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new_tgControl.getTransform(t3dView);
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t3dView.get(v3fTrans);
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t3dView.get(m3fRot);
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m3fRot.transform(new Vector3f(0.0f, 0.0f, -rocket.getSpeedFactor()), v3fTemp);
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v3fTrans.add(v3fTemp);
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t3dView.setTranslation(v3fTrans);
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new_tgControl.setTransform(t3dView);
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}
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}
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// Set wakeup criteria for next time.
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wakeupOn(wakeUpFrame);
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}
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}
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