Java 怎么实现三维弹跳球

2019年7月29日20:02:56Java 怎么实现三维弹跳球已关闭评论 418 2730字阅读9分6秒

1.简介

Java 怎么实现三维弹跳球?——请看下文。

2.示例代码

/**
 * 版权所有 编程十万个怎么办(www.tah1986.com)
 */


import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.geometry.Sphere;
import javax.swing.Timer;

public class BouncingBall extends Applet implements ActionListener,
        KeyListener {

    private Button go = new Button("Go");
    private TransformGroup objTrans;
    private Transform3D trans = new Transform3D();
    private float height = 0.0f;
    private float sign = 1.0f; 
    private Timer timer;
    private float xloc = 0.0f;

    public BouncingBall() {

        setLayout(new BorderLayout());
        GraphicsConfiguration config = SimpleUniverse
                .getPreferredConfiguration();
        Canvas3D c = new Canvas3D(config); 
        add("Center", c);
        c.addKeyListener(this);
        timer = new Timer(100, this);

        

        Panel p = new Panel();
        p.add(go);
        add("North", p);
        go.addActionListener(this);
        go.addKeyListener(this);

        BranchGroup scene = createSceneGraph();
        SimpleUniverse u = new SimpleUniverse(c);
        u.getViewingPlatform().setNominalViewingTransform();
        u.addBranchGraph(scene);

    }

    public BranchGroup createSceneGraph() {

        BranchGroup objRoot = new BranchGroup();
        objTrans = new TransformGroup();
        objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        objRoot.addChild(objTrans);

        Sphere sphere = new Sphere(0.25f);
        objTrans = new TransformGroup();
        objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        Transform3D pos1 = new Transform3D();
        pos1.setTranslation(new Vector3f(0.0f, 0.0f, 0.0f));
        objTrans.setTransform(pos1);
        objTrans.addChild(sphere);
        objRoot.addChild(objTrans);
        BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0,
                0.0), 100.0);

        Color3f light1Color = new Color3f(1.0f, 0.0f, 0.2f);
        Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f);
        DirectionalLight light1 = new DirectionalLight(light1Color,
                light1Direction);
        light1.setInfluencingBounds(bounds);
        objRoot.addChild(light1);

        
        Color3f ambientColor = new Color3f(1.0f, 1.0f, 1.0f);
        AmbientLight ambientLightNode = new AmbientLight(ambientColor);
        ambientLightNode.setInfluencingBounds(bounds);
        objRoot.addChild(ambientLightNode);
        return objRoot;

    }

    public void keyPressed(KeyEvent e) {

        
        if (e.getKeyChar() == 's') {
            xloc = xloc + .1f;
        }
        if (e.getKeyChar() == 'a') {
            xloc = xloc - .1f;
        }

    }

    public void keyReleased(KeyEvent e) {
        
    }

    public void keyTyped(KeyEvent e) {
        
    }

    public void actionPerformed(ActionEvent e) {
        
        if (e.getSource() == go) {
            if (!timer.isRunning()) {
                timer.start();
            }
        }

        else {
            height += .1 * sign;
            if (Math.abs(height * 2) >= 1)
                sign = -1.0f * sign;
            if (height < -0.4f) {
                trans.setScale(new Vector3d(1.0, .8, 1.0));

            } else {
                trans.setScale(new Vector3d(1.0, 1.0, 1.0));
            }
            trans.setTranslation(new Vector3f(xloc, height, 0.0f));
            objTrans.setTransform(trans);
        }

    }

    public static void main(String[] args) {
        System.out.println("Program Started");
        BouncingBall bb = new BouncingBall();
        bb.addKeyListener(bb);
        MainFrame mf = new MainFrame(bb, 256, 256); 
        mf.setTitle("Hello");

    }

}

 
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