6.8 Background

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/java/jdk1.4/demo/java3d/Background> ls -1
BackgroundGeometry.class
BackgroundGeometry.html
BackgroundGeometry.java
BackgroundGeometry_plugin.html

/**
<applet align=middle
 code="BackgroundGeometry.class" width=750 height=750>           
</applet>
 */
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() {
    BranchGroup objRoot = new BranchGroup();
    TransformGroup objScale = new TransformGroup();
    Transform3D t3d = new Transform3D();
    t3d.setScale(0.4);
    objScale.setTransform(t3d);
    objRoot.addChild(objScale);
    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));
    }
    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) {
      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);

    u.getViewingPlatform().
      setNominalViewingTransform();

    TransformGroup viewTrans =
      u.getViewingPlatform().
      getViewPlatformTransform();
    MouseRotate behavior1 =
      new MouseRotate(viewTrans);
    scene.addChild(behavior1);
    behavior1.setSchedulingBounds(bounds);
    MouseZoom behavior2 =
      new MouseZoom(viewTrans);
    scene.addChild(behavior2);
    behavior2.setSchedulingBounds(bounds);
    MouseTranslate behavior3 =
      new MouseTranslate(viewTrans);
    scene.addChild(behavior3);
    behavior3.setSchedulingBounds(bounds);
    scene.compile();
    u.addBranchGraph(scene);
  }

  public void destroy() {
    u.removeAllLocales();
  }
  
  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");
    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);
  }
}

�} 14: BackgroundGeometry