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How to use Text2D class in Java3D E-mail
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This Java tip shows how to use Text2D class in Java3D API.


Image

import java.applet.Applet;
import java.awt.AWTEvent;
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GraphicsConfiguration;
import java.awt.event.KeyEvent;
import java.util.Enumeration;

import javax.media.j3d.Alpha;
import javax.media.j3d.Appearance;
import javax.media.j3d.Behavior;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.Bounds;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.PolygonAttributes;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.Shape3D;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.WakeupCondition;
import javax.media.j3d.WakeupCriterion;
import javax.media.j3d.WakeupOnAWTEvent;
import javax.media.j3d.WakeupOr;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.Text2D;
import com.sun.j3d.utils.universe.SimpleUniverse;

public class Text2DTest extends Applet {

  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. Add it to the
    // root of the subgraph.
    TransformGroup objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.00.0),
        100.0);

    TransformGroup textTranslationGroup;
    Transform3D textTranslation;
    float yPos = -.5f;
    Shape3D textObject = new Text2D("Rotating Yellow Text"new Color3f(1f,
        1f0f)"Serif"60, Font.BOLD);
    Appearance app = textObject.getAppearance();

    PolygonAttributes pa = app.getPolygonAttributes();
    if (pa == null)
      pa = new PolygonAttributes();
    pa.setCullFace(PolygonAttributes.CULL_NONE);
    if (app.getPolygonAttributes() == null)
      app.setPolygonAttributes(pa);
    objTrans.addChild(textObject);

    textTranslation = new Transform3D();
    textTranslation.setTranslation(new Vector3f(0f, yPos, 0f));
    textTranslationGroup = new TransformGroup(textTranslation);
    textTranslationGroup.addChild(objTrans);
    objScale.addChild(textTranslationGroup);
    yPos += .5f;

    /* Blue 40point text */
    textObject = new Text2D("Blue 40point Text"new Color3f(0f0f1f),
        "Serif"40, Font.BOLD);
    textTranslation = new Transform3D();
    textTranslation.setTranslation(new Vector3f(0f, yPos, 0f));
    textTranslationGroup = new TransformGroup(textTranslation);
    textTranslationGroup.addChild(textObject);
    objScale.addChild(textTranslationGroup);
    yPos += .5f;

    /* Green italic text */
    textObject = new Text2D("Green Italic Text"new Color3f(0f1f0f),
        "Serif"70, Font.ITALIC);
    textTranslation = new Transform3D();
    textTranslation.setTranslation(new Vector3f(0f, yPos, 0f));
    textTranslationGroup = new TransformGroup(textTranslation);
    textTranslationGroup.addChild(textObject);
    objScale.addChild(textTranslationGroup);
    yPos += .5f;

    // Create a new Behavior object that will perform the desired
    // operation on the specified transform object and add it into
    // the scene graph.
    Transform3D yAxis = new Transform3D();
    Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 00,
        400000000);

    RotationInterpolator rotator = new RotationInterpolator(rotationAlpha,
        objTrans, yAxis, 0.0f(floatMath.PI * 2.0f);
    rotator.setSchedulingBounds(bounds);
    objTrans.addChild(rotator);

    return objRoot;
  }

  public Text2DTest() {
  }

  public void init() {
    setLayout(new BorderLayout());
    GraphicsConfiguration config = SimpleUniverse
        .getPreferredConfiguration();

    Canvas3D c = new Canvas3D(config);
    add("Center", c);

    // Create a simple scene and attach it to the virtual universe
    BranchGroup scene = createSceneGraph();
    u = new SimpleUniverse(c);
    MoverBehavior navigator = new MoverBehavior(u.getViewingPlatform()
        .getViewPlatformTransform());
    scene.addChild(navigator);

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

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

    u.addBranchGraph(scene);
  }

  public void destroy() {
    u.cleanup();
  }

  //
  // The following allows HelloUniverse to be run as an application
  // as well as an applet
  //
  public static void main(String[] args) {
    new MainFrame(new Text2DTest()256256);
  }
}

// Mover behavior class - used to allow viewer to move using arrow keys

class MoverBehavior extends Behavior {
  WakeupOnAWTEvent w1 = new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);

  WakeupCriterion[] w2 = w1 };

  WakeupCondition w = new WakeupOr(w2);

  TransformGroup viewTransformGroup;

  double rotation = 0.0// holds current rotation radians

  public void initialize() {
    // Establish initial wakeup criteria
    wakeupOn(w);
  }

  /**
   * Override Behavior's stimulus method to handle the event.
   */
  public void processStimulus(Enumeration criteria) {
    WakeupOnAWTEvent ev;
    WakeupCriterion genericEvt;
    AWTEvent[] events;

    while (criteria.hasMoreElements()) {
      genericEvt = (WakeupCriterioncriteria.nextElement();
      if (genericEvt instanceof WakeupOnAWTEvent) {
        ev = (WakeupOnAWTEventgenericEvt;
        events = ev.getAWTEvent();
        processManualEvent(events);
      }
    }
    // Set wakeup criteria for next time
    wakeupOn(w);
  }

  /**
   * Process a keyboard event to move or rotate the viewer.
   */
  void processManualEvent(AWTEvent[] events) {

    for (int i = 0; i < events.length; ++i) {
      if (events[iinstanceof KeyEvent) {
        KeyEvent event = (KeyEventevents[i];
        if (event.getKeyCode() == KeyEvent.VK_EQUALS) {
          continue;
        }
        Transform3D t = new Transform3D();
        viewTransformGroup.getTransform(t);
        Vector3f viewDir = new Vector3f(0f0f, -1f);
        Vector3f translation = new Vector3f();
        t.get(translation);
        t.transform(viewDir);
        if (event.getKeyCode() == KeyEvent.VK_UP) {
          translation.x += viewDir.x;
          translation.y += viewDir.y;
          translation.z += viewDir.z;
        else if (event.getKeyCode() == KeyEvent.VK_DOWN) {
          translation.x -= viewDir.x;
          translation.y -= viewDir.y;
          translation.z -= viewDir.z;
        else if (event.getKeyCode() == KeyEvent.VK_RIGHT) {
          rotation += -.1;
        else if (event.getKeyCode() == KeyEvent.VK_LEFT) {
          rotation += .1;
        }
        t.rotY(rotation);
        t.setTranslation(translation);
        viewTransformGroup.setTransform(t);
      }
    }
  }

  /**
   * Constructor
   */
  public MoverBehavior(TransformGroup trans) {
    viewTransformGroup = trans;
    Bounds bound = new BoundingSphere(new Point3d(0.00.00.0)10000.0);
    this.setSchedulingBounds(bound);
  }
}

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