backgroundgeometry.java

java3d背景设计

/*
 *	@(#)BackgroundGeometry.java 1.11 02/10/21 13:37:48
 *
 * Copyright (c) 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
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 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
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 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
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 *   distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
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import com.sun.j3d.utils.image.TextureLoader;
import com.sun.j3d.utils.behaviors.mouse.*;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;

public class BackgroundGeometry extends Applet {

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);

    private java.net.URL bgImage = null;

    private SimpleUniverse u = null;

    public BranchGroup createSceneGraph() {

        // Create the root of the branch graph
        BranchGroup objRoot = new BranchGroup();

        // Create a Transformgroup to scale all objects so they
        // appear in the scene.
        TransformGroup objScale = new TransformGroup();
        Transform3D t3d = new Transform3D();
        t3d.setScale(0.4);
        objScale.setTransform(t3d);
        objRoot.addChild(objScale);

        // 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.
        TransformGroup objTrans = new TransformGroup();
        objScale.addChild(objTrans);
    
        Background bg = new Background();
        bg.setApplicationBounds(bounds);
	BranchGroup backGeoBranch = new BranchGroup();
        Sphere sphereObj = new Sphere(1.0f, Sphere.GENERATE_NORMALS |
			          Sphere.GENERATE_NORMALS_INWARD |
				  Sphere.GENERATE_TEXTURE_COORDS, 45);
        Appearance backgroundApp = sphereObj.getAppearance();
        backGeoBranch.addChild(sphereObj);
        bg.setGeometry(backGeoBranch);
        objTrans.addChild(bg);

        TextureLoader tex = new TextureLoader(bgImage,
					      new String("RGB"), this);
        if (tex != null) 
	    backgroundApp.setTexture(tex.getTexture());

        Vector3f tranlation = new Vector3f(2.0f, 0.0f, 0.0f);
        Transform3D modelTransform = new Transform3D();
        Transform3D tmpTransform = new Transform3D();
        double angleInc = Math.PI/8.0;
        double angle = 0.0;
	int numBoxes = 16;

        float scaleX[] =  {0.1f, 0.2f, 0.2f, 0.3f,
                           0.2f, 0.1f, 0.2f, 0.3f,
                           0.1f, 0.3f, 0.2f, 0.3f,
                           0.1f, 0.3f, 0.2f, 0.3f};

        float scaleY[] =  {0.3f, 0.4f, 0.3f, 0.4f,
                           0.3f, 0.4f, 0.3f, 0.4f,
                           0.3f, 0.3f, 0.3f, 0.3f,
                           0.3f, 0.3f, 0.3f, 0.4f};

        float scaleZ[] =  {0.3f, 0.2f, 0.1f, 0.1f,
                           0.3f, 0.2f, 0.1f, 0.3f,
                           0.3f, 0.2f, 0.1f, 0.3f,
                           0.3f, 0.2f, 0.1f, 0.2f};

        Appearance a1 = new Appearance();
        Color3f eColor    = new Color3f(0.0f, 0.0f, 0.0f);
        Color3f sColor    = new Color3f(0.5f, 0.5f, 1.0f);
        Color3f oColor    = new Color3f(0.5f, 0.5f, 0.3f);

        Material m = new Material(oColor, eColor, oColor, sColor, 100.0f);
        m.setLightingEnable(true);
        a1.setMaterial(m);

        for (int i=0; i<numBoxes; i++, angle += angleInc) {
            modelTransform.rotY(angle);
            tmpTransform.set(tranlation);
            modelTransform.mul(tmpTransform);

            TransformGroup tgroup = new TransformGroup(modelTransform);
            objTrans.addChild(tgroup);

            tgroup.addChild( new Box(scaleX[i],scaleY[i],scaleZ[i],
				Box.GENERATE_NORMALS,a1));
        }


        // Shine it with two lights.
        Color3f lColor1 = new Color3f(0.7f, 0.7f, 0.7f);
        Color3f lColor2 = new Color3f(0.2f, 0.2f, 0.1f);
        Vector3f lDir1  = new Vector3f(-1.0f, -1.0f, -1.0f);
        Vector3f lDir2  = new Vector3f(0.0f, 0.0f, -1.0f);
        DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
        DirectionalLight lgt2 = new DirectionalLight(lColor2, lDir2);
        lgt1.setInfluencingBounds(bounds);
        lgt2.setInfluencingBounds(bounds);
        objScale.addChild(lgt1);
        objScale.addChild(lgt2);

 
        return objRoot;
    }

    public BackgroundGeometry (){
    }

    public BackgroundGeometry(java.net.URL bgurl) {
        bgImage = bgurl;
    }

    public void init() {

        if (bgImage == null) {
	    // the path to the image for an applet
	    try {
	        bgImage = new java.net.URL(getCodeBase().toString() +
					   "../images/bg.jpg");
	    }
	    catch (java.net.MalformedURLException ex) {
	        System.out.println(ex.getMessage());
		System.exit(1);
	    }
	}
        setLayout(new BorderLayout());
        GraphicsConfiguration config =
		SimpleUniverse.getPreferredConfiguration();

    	Canvas3D c = new Canvas3D(config);
    	add("Center", c);
    
    	BranchGroup scene = createSceneGraph();
    	u = new SimpleUniverse(c);

        // This will move the ViewPlatform back a bit so the
        // objects in the scene can be viewed.
        u.getViewingPlatform().setNominalViewingTransform();

        TransformGroup viewTrans =
                u.getViewingPlatform().getViewPlatformTransform();

        // Create the rotate behavior node
        MouseRotate behavior1 = new MouseRotate(viewTrans);
        scene.addChild(behavior1);
        behavior1.setSchedulingBounds(bounds);

        // Create the zoom behavior node
        MouseZoom behavior2 = new MouseZoom(viewTrans);
        scene.addChild(behavior2);
        behavior2.setSchedulingBounds(bounds);

        // Create the translate behavior node
        MouseTranslate behavior3 = new MouseTranslate(viewTrans);
        scene.addChild(behavior3);
        behavior3.setSchedulingBounds(bounds);

        // Let Java 3D perform optimizations on this scene graph.
        scene.compile();

        u.addBranchGraph(scene);
    }

    public void destroy() {
	u.cleanup();
    }
  
    public static void main(String argv[]) {
      System.out.println("Usage: mouse buttons to rotate, zoom or translate the view platform transform"); 
      System.out.println("       Note that the background geometry only changes with rotation");
      // the path to the image file for an application
      java.net.URL bgurl = null;
      try {
	  bgurl = new java.net.URL("file:../images/bg.jpg");
      }
      catch (java.net.MalformedURLException ex) {
	  System.out.println(ex.getMessage());
	  System.exit(1);
      }
      new MainFrame(new BackgroundGeometry(bgurl), 750, 750);
    }
}