First refactoring: separated DisplayShelf and DisplayShelfRenderer;

fixed context issues to allow GLJPanel to properly render display shelf
(Slider temporarily removed; functionality will re-appear in later
refactoring)


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/joglutils/trunk@51 83d24430-9974-4f80-8418-2cc3294053b9

3 files changed, 646 insertions, 571 deletions

diff --git a/build/joglutils.jar b/build/joglutils.jar
index 31adcc9..1b4aefa 100644
--- a/build/joglutils.jar
+++ b/build/joglutils.jar
diff --git a/src/net/java/joglutils/msg/test/DisplayShelf.java b/src/net/java/joglutils/msg/test/DisplayShelf.java
index b78f73a..02d9e28 100644
--- a/src/net/java/joglutils/msg/test/DisplayShelf.java
+++ b/src/net/java/joglutils/msg/test/DisplayShelf.java
@@ -37,585 +37,20 @@
 
 package net.java.joglutils.msg.test;
 
-import java.awt.BasicStroke;
 import java.awt.BorderLayout;
-import java.awt.Color;
-import java.awt.Container;
 import java.awt.DisplayMode;
 import java.awt.Frame;
-import java.awt.Graphics2D;
 import java.awt.GraphicsDevice;
 import java.awt.GraphicsEnvironment;
 import java.awt.event.*;
-import java.awt.image.*;
-import java.net.*;
-import java.util.*;
-import javax.imageio.*;
+
 import javax.swing.*;
-import javax.swing.event.*;
 
 import javax.media.opengl.*;
-import com.sun.opengl.util.j2d.*;
-
-import net.java.joglutils.msg.actions.*;
-import net.java.joglutils.msg.collections.*;
-import net.java.joglutils.msg.math.*;
-import net.java.joglutils.msg.misc.*;
-import net.java.joglutils.msg.nodes.*;
 
 /** A test implementing a 3D display shelf component. */
 
-public class DisplayShelf extends Container {
-  private GLCanvas canvas;
-
-  private float DEFAULT_ASPECT_RATIO = 0.665f;
-  // This also affects the spacing
-  private float DEFAULT_HEIGHT = 1.5f;
-  private float DEFAULT_ON_SCREEN_FRAC = 0.5f;
-  private float EDITING_ON_SCREEN_FRAC = 0.95f;
-  private float offsetFrac;
-
-  private float STACKED_SPACING_FRAC  = 0.3f;
-  private float SELECTED_SPACING_FRAC = 0.6f;
-  private float EDITED_SPACING_FRAC   = 1.5f;
-
-  // This is how much we raise the geometry above the floor in single image mode
-  private float SINGLE_IMAGE_MODE_RAISE_FRAC = 2.0f;
-
-  // The camera
-  private PerspectiveCamera camera;
-
-  static class TitleGraph {
-    String url;
-    Separator sep   = new Separator();
-    Transform xform = new Transform();
-    Texture2  texture = new Texture2();
-    Coordinate3 coords = new Coordinate3();
-
-    TitleGraph(String url) {
-      this.url = url;
-    }
-  }
-
-  private Group root;
-  private Separator imageRoot;
-  private String[] images;
-  private List<TitleGraph> titles = new ArrayList<TitleGraph>();
-  private JSlider slider;
-  private int targetIndex;
-  // This encodes both the current position and the horizontal animation alpha
-  private float currentIndex;
-  // This encodes the animation alpha for the z-coordinate motion
-  // associated with going in to and out of editing mode
-  private float currentZ;
-  private float targetZ;
-  // This is effectively a constant
-  private float viewingZ;
-  // This is also currently effectively a constant, though we need to
-  // compute it dynamically for each picture to get it to show up
-  // centered
-  private float editingZ;
-  // This encodes our current Y coordinate in editing mode
-  private float currentY;
-  // This encodes our target Y coordinate in editing mode
-  private float targetY;
-  // If the difference between the current and target values of any of
-  // the above are > EPSILON, then we will continue repainting
-  private static final float EPSILON = 1.0e-3f;
-  private SystemTime time;
-  private boolean animating;
-  private boolean forceRecompute;
-  // Single image mode toggle
-  private boolean singleImageMode;
-
-  // A scale factor for the animation speed
-  private static final float ANIM_SCALE_FACTOR = 7.0f;
-  // The rotation angle of the titles
-  private static final float ROT_ANGLE = (float) Math.toRadians(75);
-
-  // Visual progress of downloads
-  private Texture2 clockTexture;
-  private volatile boolean doneLoading;
-
-  private void computeCoords(Coordinate3 coordNode, float aspectRatio) {
-    Vec3fCollection coords = coordNode.getData();
-    if (coords == null) {
-      coords = new Vec3fCollection();
-      Vec3f zero = new Vec3f();
-      for (int i = 0; i < 6; i++) {
-        coords.add(zero);
-      }
-      coordNode.setData(coords);
-    }
-    // Now compute the actual values
-    Vec3f lowerLeft  = new Vec3f(-0.5f * DEFAULT_HEIGHT * aspectRatio, 0, 0);
-    Vec3f lowerRight = new Vec3f( 0.5f * DEFAULT_HEIGHT * aspectRatio, 0, 0);
-    Vec3f upperLeft  = new Vec3f(-0.5f * DEFAULT_HEIGHT * aspectRatio, DEFAULT_HEIGHT, 0);
-    Vec3f upperRight = new Vec3f( 0.5f * DEFAULT_HEIGHT * aspectRatio, DEFAULT_HEIGHT, 0);
-    // First triangle
-    coords.set(0, upperRight);
-    coords.set(1, upperLeft);
-    coords.set(2, lowerLeft);
-    // Second triangle
-    coords.set(3, upperRight);
-    coords.set(4, lowerLeft);
-    coords.set(5, lowerRight);
-  }
-
-  private static void drawClock(Graphics2D g, int minsPastMidnight,
-                                int x, int y, int width, int height) {
-    g.setColor(Color.DARK_GRAY);
-    g.fillRect(x, y, width, height);
-    g.setColor(Color.GRAY);
-    int midx = (int) (x + (width / 2.0f));
-    int midy = (int) (y + (height / 2.0f));
-    int sz = (int) (0.8f * Math.min(width, height));
-    g.setStroke(new BasicStroke(sz / 20.0f,
-                                BasicStroke.CAP_ROUND,
-                                BasicStroke.JOIN_MITER));
-    int arcSz = (int) (0.4f * sz);
-    int smallHandSz = (int) (0.3f * sz);
-    int bigHandSz   = (int) (0.4f * sz);
-    g.drawRoundRect(midx - (sz / 2), midy - (sz / 2),
-                    sz, sz,
-                    arcSz, arcSz);
-    float hour = minsPastMidnight / 60.0f;
-    int   min  = minsPastMidnight % 60;
-    float hourAngle = hour * 2.0f * (float) Math.PI / 12;
-    float minAngle  = min * 2.0f * (float) Math.PI / 60;
-
-    g.drawLine(midx, midy,
-               midx + (int) (smallHandSz * Math.cos(hourAngle)),
-               midy + (int) (smallHandSz * Math.sin(hourAngle)));
-    g.drawLine(midx, midy,
-               midx + (int) (bigHandSz * Math.cos(minAngle)),
-               midy + (int) (bigHandSz * Math.sin(minAngle)));
-  }
-
-  private void startLoading() {
-    final List<TitleGraph> queuedGraphs = new ArrayList<TitleGraph>();
-    queuedGraphs.addAll(titles);
-
-    Thread loaderThread = new Thread(new Runnable() {
-        public void run() {
-          try {
-            while (queuedGraphs.size() > 0) {
-              TitleGraph graph = queuedGraphs.remove(0);
-              BufferedImage img = null;
-              try {
-                img = ImageIO.read(new URL(graph.url));
-              } catch (Exception e) {
-                System.out.println("Exception loading " + graph.url + ":");
-                e.printStackTrace();
-              }
-              if (img != null) {
-                graph.sep.replaceChild(clockTexture, graph.texture);
-                graph.texture.setTexture(img, false);
-                // Figure out the new aspect ratio based on the image's width and height
-                float aspectRatio = (float) img.getWidth() / (float) img.getHeight();
-                // Compute new coordinates
-                computeCoords(graph.coords, aspectRatio);
-                // Schedule a repaint
-                canvas.repaint();
-              }
-            }
-          } finally {
-            doneLoading = true;
-          }
-        }
-      });
-    // Avoid having the loader thread preempt the rendering thread
-    loaderThread.setPriority(Thread.NORM_PRIORITY - 2);
-    loaderThread.start();
-  }
-
-  private void startClockAnimation() {
-    Thread clockAnimThread = new Thread(new Runnable() {
-        public void run() {
-          while (!doneLoading) {
-            canvas.repaint();
-            try {
-              Thread.sleep(100);
-            } catch (InterruptedException e) {
-            }
-          }
-        }
-      });
-    clockAnimThread.start();
-  }
-
-  private void setTargetIndex(int index) {
-    this.targetIndex = index;
-    if (!animating) {
-      time.rebase();
-    }
-    recomputeTargetYZ(true);
-    canvas.repaint();
-  }
-
-  private void recomputeTargetYZ(boolean animate) {
-    if (singleImageMode) {
-      // Compute a target Y and Z depth based on the image we want to view
-
-      // FIXME: right now the Y and Z targets are always the same, but
-      // once we adjust the images to fit within a bounding square,
-      // they won't be
-      targetY = (0.5f + SINGLE_IMAGE_MODE_RAISE_FRAC) * DEFAULT_HEIGHT;
-      editingZ = 0.5f * DEFAULT_HEIGHT / (EDITING_ON_SCREEN_FRAC * (float) Math.tan(camera.getHeightAngle()));
-      targetZ = editingZ;
-    } else {
-      targetY = 0.5f * DEFAULT_HEIGHT;
-      targetZ = viewingZ;
-    }
-
-    if (!animate) {
-      currentY = targetY;
-      currentZ = targetZ;
-      currentIndex = targetIndex;
-    }
-  }
-
-  private boolean recompute() {
-    if (!forceRecompute) {
-      if (Math.abs(targetIndex - currentIndex) < EPSILON &&
-          Math.abs(targetZ - currentZ) < EPSILON &&
-          Math.abs(targetY - currentY) < EPSILON)
-        return false;
-    }
-
-    forceRecompute = false;
-
-    time.update();
-    float deltaT = (float) time.deltaT();
-
-    // Make the animation speed independent of frame rate
-    currentIndex = currentIndex + (targetIndex - currentIndex) * deltaT * ANIM_SCALE_FACTOR;
-    currentZ = currentZ + (targetZ - currentZ) * deltaT * ANIM_SCALE_FACTOR;
-    currentY = currentY + (targetY - currentY) * deltaT * ANIM_SCALE_FACTOR;
-    // An alpha of 0 indicates we're fully in viewing mode
-    // An alpha of 1 indicates we're fully in editing mode
-    float zAlpha = (currentZ - viewingZ) / (editingZ - viewingZ);
-
-    // Recompute the positions and orientations of each title, and the position of the camera
-    int firstIndex  = (int) Math.floor(currentIndex);
-    int secondIndex = (int) Math.ceil(currentIndex);
-    if (secondIndex == firstIndex) {
-      secondIndex = firstIndex + 1;
-    }
-
-    float alpha = currentIndex - firstIndex;
-
-    int idx = 0;
-    float curPos = 0.0f;
-    float stackedSpacing  = DEFAULT_HEIGHT * (zAlpha * EDITED_SPACING_FRAC + (1.0f - zAlpha) * STACKED_SPACING_FRAC);
-    float selectedSpacing = DEFAULT_HEIGHT * (zAlpha * EDITED_SPACING_FRAC + (1.0f - zAlpha) * SELECTED_SPACING_FRAC);
-    float angle = (1.0f - zAlpha) * ROT_ANGLE;
-    float y = zAlpha * DEFAULT_HEIGHT * SINGLE_IMAGE_MODE_RAISE_FRAC;
-    Rotf posAngle = new Rotf(Vec3f.Y_AXIS,  angle);
-    Rotf negAngle = new Rotf(Vec3f.Y_AXIS, -angle);
-    float offset = 0;
-
-    // Only bump the selected title out of the list if we're in viewing mode and close to it
-    if (Math.abs(targetIndex - currentIndex) < 3.0) {
-      offset = (1.0f - zAlpha) * offsetFrac * DEFAULT_HEIGHT;
-    }
-    for (TitleGraph graph : titles) {
-      if (idx < firstIndex) {
-        graph.xform.getTransform().setRotation(posAngle);
-        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, 0));
-        curPos += stackedSpacing;
-      } else if (idx > secondIndex) {
-        graph.xform.getTransform().setRotation(negAngle);
-        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, 0));
-        curPos += stackedSpacing;
-      } else if (idx == firstIndex) {
-        // Bump the position of this title
-        curPos += (1.0f - alpha) * (selectedSpacing - stackedSpacing);
-
-        // The camera is glued to this position
-        float cameraPos = curPos + alpha * selectedSpacing;
-
-        // Interpolate
-        graph.xform.getTransform().setRotation(new Rotf(Vec3f.Y_AXIS, alpha * angle));
-        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, (1.0f - alpha) * offset));
-
-        // Now recompute the position of the camera
-        // Aim to get the titles to fill a certain fraction of the vertical field of view
-        camera.setPosition(new Vec3f(cameraPos,
-                                     currentY,
-                                     currentZ));
-
-        // Maintain this much distance between the two animating titles
-        curPos += selectedSpacing;
-      } else {
-        // Interpolate
-        graph.xform.getTransform().setRotation(new Rotf(Vec3f.Y_AXIS, (1.0f - alpha) * -angle));
-        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, alpha * offset));
-
-        curPos += stackedSpacing + alpha * (selectedSpacing - stackedSpacing);
-      }
-
-      ++idx;
-    }
-
-    return true;
-  }
-
-  public DisplayShelf(Group root, String[] images) {
-    this.images = images;
-    this.root = root;
-    time = new SystemTime();
-    time.rebase();
-    setLayout(new BorderLayout());
-    camera = new PerspectiveCamera();
-    camera.setNearDistance(1.0f);
-    camera.setFarDistance(100.0f);
-    camera.setHeightAngle((float) Math.PI / 8);
-    // This could / should be computed elsewhere, especially if we add
-    // the ability to dynamically adjust the camera's height angle
-    viewingZ = 0.5f * DEFAULT_HEIGHT / (DEFAULT_ON_SCREEN_FRAC * (float) Math.tan(camera.getHeightAngle()));
-    // Compute the fraction by which we offset the selected title
-    // based on a couple of known good points
-    offsetFrac = (float) (((3 * Math.PI / 40) / camera.getHeightAngle()) + 0.1f);
-    canvas = new GLCanvas();
-    canvas.addGLEventListener(new Listener());
-    canvas.addMouseListener(new MListener());
-    canvas.addKeyListener(new KeyAdapter() {
-        public void keyPressed(KeyEvent e) {
-          switch (e.getKeyCode()) {
-            case KeyEvent.VK_SPACE:
-              setSingleImageMode(!getSingleImageMode(), true);
-              break;
-
-            case KeyEvent.VK_ENTER:
-              setSingleImageMode(!getSingleImageMode(), false);
-              break;
-
-            case KeyEvent.VK_LEFT:
-              slider.setValue(Math.max(0, targetIndex - 1));
-              break;
-
-            case KeyEvent.VK_RIGHT:
-              slider.setValue(Math.min(titles.size() - 1, targetIndex + 1));
-              break;
-          }
-        }
-      });
-    add(canvas, BorderLayout.CENTER);
-    slider = new JSlider(0, images.length - 1, 0);
-    slider.addChangeListener(new ChangeListener() {
-        public void stateChanged(ChangeEvent e) {
-          setTargetIndex(slider.getValue());
-        }
-      });
-    add(slider, BorderLayout.SOUTH);
-  }
-
-  public void setSingleImageMode(boolean singleImageMode, boolean animateTransition) {
-    this.singleImageMode = singleImageMode;
-    if (!animating) {
-      time.rebase();
-    }
-    recomputeTargetYZ(animateTransition);
-    forceRecompute = !animateTransition;
-    canvas.repaint();
-  }
-
-  public boolean getSingleImageMode() {
-    return singleImageMode;
-  }
-
-  class Listener implements GLEventListener {
-    private GLRenderAction ra = new GLRenderAction();
-    
-    public void init(GLAutoDrawable drawable) {
-      GL gl = drawable.getGL();
-
-      // Build the scene graph
-      root.removeAllChildren();
-
-      // The clock
-      clockTexture = new Texture2();
-      clockTexture.initTextureRenderer((int) (300 * DEFAULT_HEIGHT * DEFAULT_ASPECT_RATIO),
-                                       (int) (300 * DEFAULT_HEIGHT),
-                                       false);
-
-      // The images
-      imageRoot = new Separator();
-
-      // The mirrored images, under the floor
-      Separator mirrorRoot = new Separator();
-
-      Transform mirrorXform = new Transform();
-      // Mirror vertically
-      mirrorXform.getTransform().set(1, 1, -1.0f);
-      mirrorRoot.addChild(mirrorXform);
-      // Assume we know what we're doing here with setting per-vertex
-      // colors for each piece of geometry in one shot
-      Color4 colorNode = new Color4();
-      Vec4fCollection colors = new Vec4fCollection();
-      Vec4f fadeTop = new Vec4f(0.75f, 0.75f, 0.75f, 0.75f);
-      Vec4f fadeBot = new Vec4f(0.25f, 0.25f, 0.25f, 0.25f);
-      // First triangle
-      colors.add(fadeTop);
-      colors.add(fadeTop);
-      colors.add(fadeBot);
-      // Second triangle    
-      colors.add(fadeTop);
-      colors.add(fadeBot);
-      colors.add(fadeBot);
-      colorNode.setData(colors);
-      mirrorRoot.addChild(colorNode);
-
-      TriangleSet tris = new TriangleSet();
-      tris.setNumTriangles(2);
-
-      int i = 0;
-      for (String image : images) {
-        TitleGraph graph = new TitleGraph(image);
-        titles.add(graph);
-        computeCoords(graph.coords, DEFAULT_ASPECT_RATIO);
-        graph.xform.getTransform().setTranslation(new Vec3f(i, 0, 0));
-        Separator sep = graph.sep;
-        sep.addChild(graph.xform);
-        sep.addChild(graph.coords);
-        // Add in the clock texture at the beginning
-        sep.addChild(clockTexture);
-        TextureCoordinate2 texCoordNode = new TextureCoordinate2();
-        Vec2fCollection texCoords = new Vec2fCollection();
-        // Texture coordinates for two triangles
-        // First triangle
-        texCoords.add(new Vec2f( 1,  1));
-        texCoords.add(new Vec2f( 0,  1));
-        texCoords.add(new Vec2f( 0,  0));
-        // Second triangle
-        texCoords.add(new Vec2f( 1,  1));
-        texCoords.add(new Vec2f( 0,  0));
-        texCoords.add(new Vec2f( 1,  0));
-        texCoordNode.setData(texCoords);
-        sep.addChild(texCoordNode);
-
-        sep.addChild(tris);
-
-        // Add this to each rendering root
-        imageRoot.addChild(sep);
-        mirrorRoot.addChild(sep);
-
-        ++i;
-      }
-
-      // Now produce the floor geometry
-      float maxSpacing = DEFAULT_HEIGHT * Math.max(STACKED_SPACING_FRAC, Math.max(SELECTED_SPACING_FRAC, EDITED_SPACING_FRAC));
-      float minx = -i * maxSpacing;
-      float maxx = 2 * i * maxSpacing;
-      // Furthest back from the camera
-      float minz = -2 * DEFAULT_HEIGHT;
-      // Assume this will be close enough to cover all of the mirrored geometry
-      float maxz =  DEFAULT_HEIGHT;
-      Separator floorRoot = new Separator();
-      Blend blend = new Blend();
-      blend.setEnabled(true);
-      blend.setSourceFunc(Blend.ONE);
-      blend.setDestFunc(Blend.ONE_MINUS_SRC_ALPHA);
-      floorRoot.addChild(blend);
-      Coordinate3 floorCoords = new Coordinate3();
-      floorCoords.setData(new Vec3fCollection());
-      // First triangle
-      floorCoords.getData().add(new Vec3f(maxx, 0, minz));
-      floorCoords.getData().add(new Vec3f(minx, 0, minz));
-      floorCoords.getData().add(new Vec3f(minx, 0, maxz));
-      // Second triangle    
-      floorCoords.getData().add(new Vec3f(maxx, 0, minz));
-      floorCoords.getData().add(new Vec3f(minx, 0, maxz));
-      floorCoords.getData().add(new Vec3f(maxx, 0, maxz));
-      floorRoot.addChild(floorCoords);
-      // Colors
-      Vec4f gray = new Vec4f(0.4f, 0.4f, 0.4f, 0.4f);
-      Vec4f clearGray = new Vec4f(0.0f, 0.0f, 0.0f, 0.0f);
-      Color4 floorColors = new Color4();
-      floorColors.setData(new Vec4fCollection());
-      // First triangle
-      floorColors.getData().add(gray);
-      floorColors.getData().add(gray);
-      floorColors.getData().add(clearGray);
-      // Second triangle    
-      floorColors.getData().add(gray);
-      floorColors.getData().add(clearGray);
-      floorColors.getData().add(clearGray);
-      floorRoot.addChild(floorColors);
-    
-      floorRoot.addChild(tris);
-
-      // Now set up the overall scene graph
-      root.addChild(camera);
-      root.addChild(imageRoot);
-      root.addChild(mirrorRoot);
-      root.addChild(floorRoot);
-
-      startLoading();
-      startClockAnimation();
-      recomputeTargetYZ(false);
-      forceRecompute = true;
-      recompute();
-    }
-
-    public void display(GLAutoDrawable drawable) {
-      // Recompute position of camera and orientation of images
-      boolean repaintAgain = recompute();
-
-      if (!doneLoading) {
-        if (!repaintAgain) {
-          time.update();
-        }
-
-        TextureRenderer rend = clockTexture.getTextureRenderer();
-        Graphics2D g = rend.createGraphics();
-        drawClock(g, (int) (time.time() * 30),
-                  0, 0, rend.getWidth(), rend.getHeight());
-        g.dispose();
-        rend.markDirty(0, 0, rend.getWidth(), rend.getHeight());
-      }
-
-      // Redraw
-      GL gl = drawable.getGL();
-      gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
-      ra.apply(root);
-
-      if (repaintAgain) {
-        animating = true;
-        canvas.repaint();
-      } else {
-        animating = false;
-      }
-    }
-
-    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
-    }
-
-    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
-  }
-
-  class MListener extends MouseAdapter {
-    RayPickAction ra = new RayPickAction();
-
-    public void mousePressed(MouseEvent e) {
-      ra.setPoint(e.getX(), e.getY(), e.getComponent());
-      // Apply to the scene root
-      ra.apply(root);
-      List<PickedPoint> pickedPoints = ra.getPickedPoints();
-      Path p = null;
-      if (!pickedPoints.isEmpty())
-        p = pickedPoints.get(0).getPath();
-      if (p != null && p.size() > 1) {
-        int idx = imageRoot.findChild(p.get(p.size() - 2));
-        if (idx >= 0) {
-          // Need to keep the slider and this mechanism in sync
-          slider.setValue(idx);
-        }
-      }
-    }
-  }
-
+public class DisplayShelf {
   public static void main(String[] args) {
     Frame f = new Frame("Display Shelf test");
     f.setLayout(new BorderLayout());
@@ -685,10 +120,11 @@ public class DisplayShelf extends Container {
       "http://download.java.net/media/jogl/builds/ds_tmp/mzi.uswlslxx.200x200-75.jpg"
     };
 
-    Separator root = new Separator();
-
-    DisplayShelf shelf = new DisplayShelf(root, images);
-    f.add(shelf);
+    DisplayShelfRenderer renderer = new DisplayShelfRenderer(images);
+    GLCanvas canvas = new GLCanvas(new GLCapabilities(), null, renderer.getSharedContext(), null);
+    canvas.setFocusable(true);
+    canvas.addGLEventListener(renderer);
+    f.add(canvas);
     GraphicsDevice dev = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
     DisplayMode curMode = dev.getDisplayMode();
     int height = (int) (0.5f * curMode.getWidth());
diff --git a/src/net/java/joglutils/msg/test/DisplayShelfRenderer.java b/src/net/java/joglutils/msg/test/DisplayShelfRenderer.java
new file mode 100644
index 0000000..6d87a87
--- /dev/null
+++ b/src/net/java/joglutils/msg/test/DisplayShelfRenderer.java
@@ -0,0 +1,639 @@
+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the 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, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ */
+
+package net.java.joglutils.msg.test;
+
+import java.awt.BasicStroke;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.event.*;
+import java.awt.image.*;
+import java.net.*;
+import java.util.*;
+import javax.imageio.*;
+
+import javax.media.opengl.*;
+import com.sun.opengl.util.j2d.*;
+
+import net.java.joglutils.msg.actions.*;
+import net.java.joglutils.msg.collections.*;
+import net.java.joglutils.msg.math.*;
+import net.java.joglutils.msg.misc.*;
+import net.java.joglutils.msg.nodes.*;
+
+public class DisplayShelfRenderer implements GLEventListener {
+  private float DEFAULT_ASPECT_RATIO = 0.665f;
+  // This also affects the spacing
+  private float DEFAULT_HEIGHT = 1.5f;
+  private float DEFAULT_ON_SCREEN_FRAC = 0.5f;
+  private float EDITING_ON_SCREEN_FRAC = 0.95f;
+  private float offsetFrac;
+
+  private float STACKED_SPACING_FRAC  = 0.3f;
+  private float SELECTED_SPACING_FRAC = 0.6f;
+  private float EDITED_SPACING_FRAC   = 1.5f;
+
+  // This is how much we raise the geometry above the floor in single image mode
+  private float SINGLE_IMAGE_MODE_RAISE_FRAC = 2.0f;
+
+  // The camera
+  private PerspectiveCamera camera;
+
+  static class TitleGraph {
+    String url;
+    Separator sep   = new Separator();
+    Transform xform = new Transform();
+    Texture2  texture = new Texture2();
+    Coordinate3 coords = new Coordinate3();
+
+    TitleGraph(String url) {
+      this.url = url;
+    }
+  }
+
+  // This is used to avoid having to re-initialize textures during
+  // resizes of Swing components
+  private GLPbuffer sharedPbuffer;
+  private boolean firstInit = true;
+
+  private GLAutoDrawable drawable;
+
+  private Separator root;
+  private Separator imageRoot;
+  private String[] images;
+  private List<TitleGraph> titles = new ArrayList<TitleGraph>();
+  private GLRenderAction ra = new GLRenderAction();
+  private int targetIndex;
+  // This encodes both the current position and the horizontal animation alpha
+  private float currentIndex;
+  // This encodes the animation alpha for the z-coordinate motion
+  // associated with going in to and out of editing mode
+  private float currentZ;
+  private float targetZ;
+  // This is effectively a constant
+  private float viewingZ;
+  // This is also currently effectively a constant, though we need to
+  // compute it dynamically for each picture to get it to show up
+  // centered
+  private float editingZ;
+  // This encodes our current Y coordinate in editing mode
+  private float currentY;
+  // This encodes our target Y coordinate in editing mode
+  private float targetY;
+  // If the difference between the current and target values of any of
+  // the above are > EPSILON, then we will continue repainting
+  private static final float EPSILON = 1.0e-3f;
+  private SystemTime time;
+  private boolean animating;
+  private boolean forceRecompute;
+  // Single image mode toggle
+  private boolean singleImageMode;
+
+  // A scale factor for the animation speed
+  private static final float ANIM_SCALE_FACTOR = 7.0f;
+  // The rotation angle of the titles
+  private static final float ROT_ANGLE = (float) Math.toRadians(75);
+
+  // Visual progress of downloads
+  private Texture2 clockTexture;
+  private volatile boolean doneLoading;
+
+  public DisplayShelfRenderer(String[] images) {
+    // Create a small pbuffer with which we share textures and display
+    // lists to avoid having to reload textures during repeated calls
+    // to init()
+    sharedPbuffer = GLDrawableFactory.getFactory().createGLPbuffer(new GLCapabilities(), null, 1, 1, null);
+    sharedPbuffer.display();
+
+    this.images = images;
+    root = new Separator();
+    time = new SystemTime();
+    time.rebase();
+    camera = new PerspectiveCamera();
+    camera.setNearDistance(1.0f);
+    camera.setFarDistance(100.0f);
+    camera.setHeightAngle((float) Math.PI / 8);
+    // This could / should be computed elsewhere, especially if we add
+    // the ability to dynamically adjust the camera's height angle
+    viewingZ = 0.5f * DEFAULT_HEIGHT / (DEFAULT_ON_SCREEN_FRAC * (float) Math.tan(camera.getHeightAngle()));
+    // Compute the fraction by which we offset the selected title
+    // based on a couple of known good points
+    offsetFrac = (float) (((3 * Math.PI / 40) / camera.getHeightAngle()) + 0.1f);
+  }
+
+  /** Callers must share textures and display lists with this context
+      for correct behavior of this renderer. It is used to avoid
+      repeated reloading of textures when resizing the renderer
+      embedded in a GLJPanel. */
+  public GLContext getSharedContext() {
+    return sharedPbuffer.getContext();
+  }
+
+  public void setSingleImageMode(boolean singleImageMode, boolean animateTransition) {
+    this.singleImageMode = singleImageMode;
+    if (!animating) {
+      time.rebase();
+    }
+    recomputeTargetYZ(animateTransition);
+    forceRecompute = !animateTransition;
+    if (drawable != null) {
+      drawable.repaint();
+    }
+  }
+
+  public boolean getSingleImageMode() {
+    return singleImageMode;
+  }
+
+  public int getNumImages() {
+    return titles.size();
+  }
+
+  public void setTargetIndex(int index) {
+    if (targetIndex == index)
+      return;
+
+    this.targetIndex = index;
+    if (!animating) {
+      time.rebase();
+    }
+    recomputeTargetYZ(true);
+    if (drawable != null) {
+      drawable.repaint();
+    }
+  }
+
+  public int getTargetIndex() {
+    return targetIndex;
+  }
+
+  public void init(GLAutoDrawable drawable) {
+    this.drawable = drawable;
+    GL gl = drawable.getGL();
+
+    if (firstInit) {
+      firstInit = false;
+
+      // Build the scene graph
+
+      // The clock
+      clockTexture = new Texture2();
+      clockTexture.initTextureRenderer((int) (300 * DEFAULT_HEIGHT * DEFAULT_ASPECT_RATIO),
+                                       (int) (300 * DEFAULT_HEIGHT),
+                                       false);
+
+      // The images
+      imageRoot = new Separator();
+
+      // The mirrored images under the floor
+      Separator mirrorRoot = new Separator();
+
+      Transform mirrorXform = new Transform();
+      // Mirror vertically
+      mirrorXform.getTransform().set(1, 1, -1.0f);
+      mirrorRoot.addChild(mirrorXform);
+      // Assume we know what we're doing here with setting per-vertex
+      // colors for each piece of geometry in one shot
+      Color4 colorNode = new Color4();
+      Vec4fCollection colors = new Vec4fCollection();
+      Vec4f fadeTop = new Vec4f(0.75f, 0.75f, 0.75f, 0.75f);
+      Vec4f fadeBot = new Vec4f(0.25f, 0.25f, 0.25f, 0.25f);
+      // First triangle
+      colors.add(fadeTop);
+      colors.add(fadeTop);
+      colors.add(fadeBot);
+      // Second triangle    
+      colors.add(fadeTop);
+      colors.add(fadeBot);
+      colors.add(fadeBot);
+      colorNode.setData(colors);
+      mirrorRoot.addChild(colorNode);
+
+      TriangleSet tris = new TriangleSet();
+      tris.setNumTriangles(2);
+
+      int i = 0;
+      for (String image : images) {
+        TitleGraph graph = new TitleGraph(image);
+        titles.add(graph);
+        computeCoords(graph.coords, DEFAULT_ASPECT_RATIO);
+        graph.xform.getTransform().setTranslation(new Vec3f(i, 0, 0));
+        Separator sep = graph.sep;
+        sep.addChild(graph.xform);
+        sep.addChild(graph.coords);
+        // Add in the clock texture at the beginning
+        sep.addChild(clockTexture);
+        TextureCoordinate2 texCoordNode = new TextureCoordinate2();
+        Vec2fCollection texCoords = new Vec2fCollection();
+        // Texture coordinates for two triangles
+        // First triangle
+        texCoords.add(new Vec2f( 1,  1));
+        texCoords.add(new Vec2f( 0,  1));
+        texCoords.add(new Vec2f( 0,  0));
+        // Second triangle
+        texCoords.add(new Vec2f( 1,  1));
+        texCoords.add(new Vec2f( 0,  0));
+        texCoords.add(new Vec2f( 1,  0));
+        texCoordNode.setData(texCoords);
+        sep.addChild(texCoordNode);
+
+        sep.addChild(tris);
+
+        // Add this to each rendering root
+        imageRoot.addChild(sep);
+        mirrorRoot.addChild(sep);
+
+        ++i;
+      }
+
+      // Now produce the floor geometry
+      float maxSpacing = DEFAULT_HEIGHT * Math.max(STACKED_SPACING_FRAC, Math.max(SELECTED_SPACING_FRAC, EDITED_SPACING_FRAC));
+      float minx = -i * maxSpacing;
+      float maxx = 2 * i * maxSpacing;
+      // Furthest back from the camera
+      float minz = -2 * DEFAULT_HEIGHT;
+      // Assume this will be close enough to cover all of the mirrored geometry
+      float maxz =  DEFAULT_HEIGHT;
+      Separator floorRoot = new Separator();
+      Blend blend = new Blend();
+      blend.setEnabled(true);
+      blend.setSourceFunc(Blend.ONE);
+      blend.setDestFunc(Blend.ONE_MINUS_SRC_ALPHA);
+      floorRoot.addChild(blend);
+      Coordinate3 floorCoords = new Coordinate3();
+      floorCoords.setData(new Vec3fCollection());
+      // First triangle
+      floorCoords.getData().add(new Vec3f(maxx, 0, minz));
+      floorCoords.getData().add(new Vec3f(minx, 0, minz));
+      floorCoords.getData().add(new Vec3f(minx, 0, maxz));
+      // Second triangle    
+      floorCoords.getData().add(new Vec3f(maxx, 0, minz));
+      floorCoords.getData().add(new Vec3f(minx, 0, maxz));
+      floorCoords.getData().add(new Vec3f(maxx, 0, maxz));
+      floorRoot.addChild(floorCoords);
+      // Colors
+      Vec4f gray = new Vec4f(0.4f, 0.4f, 0.4f, 0.4f);
+      Vec4f clearGray = new Vec4f(0.0f, 0.0f, 0.0f, 0.0f);
+      Color4 floorColors = new Color4();
+      floorColors.setData(new Vec4fCollection());
+      // First triangle
+      floorColors.getData().add(gray);
+      floorColors.getData().add(gray);
+      floorColors.getData().add(clearGray);
+      // Second triangle    
+      floorColors.getData().add(gray);
+      floorColors.getData().add(clearGray);
+      floorColors.getData().add(clearGray);
+      floorRoot.addChild(floorColors);
+    
+      floorRoot.addChild(tris);
+
+      // Now set up the overall scene graph
+      root.addChild(camera);
+      root.addChild(imageRoot);
+      root.addChild(mirrorRoot);
+      root.addChild(floorRoot);
+
+      // Attach listeners (this is only for testing for now)
+      drawable.addMouseListener(new MListener());
+      drawable.addKeyListener(new KeyAdapter() {
+          public void keyPressed(KeyEvent e) {
+            switch (e.getKeyCode()) {
+            case KeyEvent.VK_SPACE:
+              setSingleImageMode(!getSingleImageMode(), true);
+              break;
+
+            case KeyEvent.VK_ENTER:
+              setSingleImageMode(!getSingleImageMode(), false);
+              break;
+
+            case KeyEvent.VK_LEFT:
+              setTargetIndex(Math.max(0, targetIndex - 1));
+              break;
+
+            case KeyEvent.VK_RIGHT:
+              setTargetIndex(Math.min(titles.size() - 1, targetIndex + 1));
+              break;
+            }
+          }
+        });
+
+      startLoading();
+      startClockAnimation();
+      recomputeTargetYZ(false);
+      forceRecompute = true;
+      recompute();
+    }
+  }
+
+  public void display(GLAutoDrawable drawable) {
+    // Recompute position of camera and orientation of images
+    boolean repaintAgain = recompute();
+
+    if (!doneLoading) {
+      if (!repaintAgain) {
+        time.update();
+      }
+
+      TextureRenderer rend = clockTexture.getTextureRenderer();
+      Graphics2D g = rend.createGraphics();
+      drawClock(g, (int) (time.time() * 30),
+                0, 0, rend.getWidth(), rend.getHeight());
+      g.dispose();
+      rend.markDirty(0, 0, rend.getWidth(), rend.getHeight());
+    }
+
+    // Redraw
+    GL gl = drawable.getGL();
+    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+    ra.apply(root);
+
+    if (repaintAgain) {
+      animating = true;
+      drawable.repaint();
+    } else {
+      animating = false;
+    }
+  }
+
+  public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
+  }
+
+  public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {}
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private void computeCoords(Coordinate3 coordNode, float aspectRatio) {
+    Vec3fCollection coords = coordNode.getData();
+    if (coords == null) {
+      coords = new Vec3fCollection();
+      Vec3f zero = new Vec3f();
+      for (int i = 0; i < 6; i++) {
+        coords.add(zero);
+      }
+      coordNode.setData(coords);
+    }
+    // Now compute the actual values
+    Vec3f lowerLeft  = new Vec3f(-0.5f * DEFAULT_HEIGHT * aspectRatio, 0, 0);
+    Vec3f lowerRight = new Vec3f( 0.5f * DEFAULT_HEIGHT * aspectRatio, 0, 0);
+    Vec3f upperLeft  = new Vec3f(-0.5f * DEFAULT_HEIGHT * aspectRatio, DEFAULT_HEIGHT, 0);
+    Vec3f upperRight = new Vec3f( 0.5f * DEFAULT_HEIGHT * aspectRatio, DEFAULT_HEIGHT, 0);
+    // First triangle
+    coords.set(0, upperRight);
+    coords.set(1, upperLeft);
+    coords.set(2, lowerLeft);
+    // Second triangle
+    coords.set(3, upperRight);
+    coords.set(4, lowerLeft);
+    coords.set(5, lowerRight);
+  }
+
+  private static void drawClock(Graphics2D g, int minsPastMidnight,
+                                int x, int y, int width, int height) {
+    g.setColor(Color.DARK_GRAY);
+    g.fillRect(x, y, width, height);
+    g.setColor(Color.GRAY);
+    int midx = (int) (x + (width / 2.0f));
+    int midy = (int) (y + (height / 2.0f));
+    int sz = (int) (0.8f * Math.min(width, height));
+    g.setStroke(new BasicStroke(sz / 20.0f,
+                                BasicStroke.CAP_ROUND,
+                                BasicStroke.JOIN_MITER));
+    int arcSz = (int) (0.4f * sz);
+    int smallHandSz = (int) (0.3f * sz);
+    int bigHandSz   = (int) (0.4f * sz);
+    g.drawRoundRect(midx - (sz / 2), midy - (sz / 2),
+                    sz, sz,
+                    arcSz, arcSz);
+    float hour = minsPastMidnight / 60.0f;
+    int   min  = minsPastMidnight % 60;
+    float hourAngle = hour * 2.0f * (float) Math.PI / 12;
+    float minAngle  = min * 2.0f * (float) Math.PI / 60;
+
+    g.drawLine(midx, midy,
+               midx + (int) (smallHandSz * Math.cos(hourAngle)),
+               midy + (int) (smallHandSz * Math.sin(hourAngle)));
+    g.drawLine(midx, midy,
+               midx + (int) (bigHandSz * Math.cos(minAngle)),
+               midy + (int) (bigHandSz * Math.sin(minAngle)));
+  }
+
+  private void startLoading() {
+    final List<TitleGraph> queuedGraphs = new ArrayList<TitleGraph>();
+    queuedGraphs.addAll(titles);
+
+    Thread loaderThread = new Thread(new Runnable() {
+        public void run() {
+          try {
+            while (queuedGraphs.size() > 0) {
+              TitleGraph graph = queuedGraphs.remove(0);
+              BufferedImage img = null;
+              try {
+                img = ImageIO.read(new URL(graph.url));
+              } catch (Exception e) {
+                System.out.println("Exception loading " + graph.url + ":");
+                e.printStackTrace();
+              }
+              if (img != null) {
+                graph.sep.replaceChild(clockTexture, graph.texture);
+                graph.texture.setTexture(img, false);
+                // Figure out the new aspect ratio based on the image's width and height
+                float aspectRatio = (float) img.getWidth() / (float) img.getHeight();
+                // Compute new coordinates
+                computeCoords(graph.coords, aspectRatio);
+                // Schedule a repaint
+                drawable.repaint();
+              }
+            }
+          } finally {
+            doneLoading = true;
+          }
+        }
+      });
+    // Avoid having the loader thread preempt the rendering thread
+    loaderThread.setPriority(Thread.NORM_PRIORITY - 2);
+    loaderThread.start();
+  }
+
+  private void startClockAnimation() {
+    Thread clockAnimThread = new Thread(new Runnable() {
+        public void run() {
+          while (!doneLoading) {
+            drawable.repaint();
+            try {
+              Thread.sleep(100);
+            } catch (InterruptedException e) {
+            }
+          }
+        }
+      });
+    clockAnimThread.start();
+  }
+
+  private void recomputeTargetYZ(boolean animate) {
+    if (singleImageMode) {
+      // Compute a target Y and Z depth based on the image we want to view
+
+      // FIXME: right now the Y and Z targets are always the same, but
+      // once we adjust the images to fit within a bounding square,
+      // they won't be
+      targetY = (0.5f + SINGLE_IMAGE_MODE_RAISE_FRAC) * DEFAULT_HEIGHT;
+      editingZ = 0.5f * DEFAULT_HEIGHT / (EDITING_ON_SCREEN_FRAC * (float) Math.tan(camera.getHeightAngle()));
+      targetZ = editingZ;
+    } else {
+      targetY = 0.5f * DEFAULT_HEIGHT;
+      targetZ = viewingZ;
+    }
+
+    if (!animate) {
+      currentY = targetY;
+      currentZ = targetZ;
+      currentIndex = targetIndex;
+    }
+  }
+
+  private boolean recompute() {
+    if (!forceRecompute) {
+      if (Math.abs(targetIndex - currentIndex) < EPSILON &&
+          Math.abs(targetZ - currentZ) < EPSILON &&
+          Math.abs(targetY - currentY) < EPSILON)
+        return false;
+    }
+
+    forceRecompute = false;
+
+    time.update();
+    float deltaT = (float) time.deltaT();
+
+    // Make the animation speed independent of frame rate
+    currentIndex = currentIndex + (targetIndex - currentIndex) * deltaT * ANIM_SCALE_FACTOR;
+    currentZ = currentZ + (targetZ - currentZ) * deltaT * ANIM_SCALE_FACTOR;
+    currentY = currentY + (targetY - currentY) * deltaT * ANIM_SCALE_FACTOR;
+    // An alpha of 0 indicates we're fully in viewing mode
+    // An alpha of 1 indicates we're fully in editing mode
+    float zAlpha = (currentZ - viewingZ) / (editingZ - viewingZ);
+
+    // Recompute the positions and orientations of each title, and the position of the camera
+    int firstIndex  = (int) Math.floor(currentIndex);
+    int secondIndex = (int) Math.ceil(currentIndex);
+    if (secondIndex == firstIndex) {
+      secondIndex = firstIndex + 1;
+    }
+
+    float alpha = currentIndex - firstIndex;
+
+    int idx = 0;
+    float curPos = 0.0f;
+    float stackedSpacing  = DEFAULT_HEIGHT * (zAlpha * EDITED_SPACING_FRAC + (1.0f - zAlpha) * STACKED_SPACING_FRAC);
+    float selectedSpacing = DEFAULT_HEIGHT * (zAlpha * EDITED_SPACING_FRAC + (1.0f - zAlpha) * SELECTED_SPACING_FRAC);
+    float angle = (1.0f - zAlpha) * ROT_ANGLE;
+    float y = zAlpha * DEFAULT_HEIGHT * SINGLE_IMAGE_MODE_RAISE_FRAC;
+    Rotf posAngle = new Rotf(Vec3f.Y_AXIS,  angle);
+    Rotf negAngle = new Rotf(Vec3f.Y_AXIS, -angle);
+    float offset = 0;
+
+    // Only bump the selected title out of the list if we're in viewing mode and close to it
+    if (Math.abs(targetIndex - currentIndex) < 3.0) {
+      offset = (1.0f - zAlpha) * offsetFrac * DEFAULT_HEIGHT;
+    }
+    for (TitleGraph graph : titles) {
+      if (idx < firstIndex) {
+        graph.xform.getTransform().setRotation(posAngle);
+        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, 0));
+        curPos += stackedSpacing;
+      } else if (idx > secondIndex) {
+        graph.xform.getTransform().setRotation(negAngle);
+        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, 0));
+        curPos += stackedSpacing;
+      } else if (idx == firstIndex) {
+        // Bump the position of this title
+        curPos += (1.0f - alpha) * (selectedSpacing - stackedSpacing);
+
+        // The camera is glued to this position
+        float cameraPos = curPos + alpha * selectedSpacing;
+
+        // Interpolate
+        graph.xform.getTransform().setRotation(new Rotf(Vec3f.Y_AXIS, alpha * angle));
+        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, (1.0f - alpha) * offset));
+
+        // Now recompute the position of the camera
+        // Aim to get the titles to fill a certain fraction of the vertical field of view
+        camera.setPosition(new Vec3f(cameraPos,
+                                     currentY,
+                                     currentZ));
+
+        // Maintain this much distance between the two animating titles
+        curPos += selectedSpacing;
+      } else {
+        // Interpolate
+        graph.xform.getTransform().setRotation(new Rotf(Vec3f.Y_AXIS, (1.0f - alpha) * -angle));
+        graph.xform.getTransform().setTranslation(new Vec3f(curPos, y, alpha * offset));
+
+        curPos += stackedSpacing + alpha * (selectedSpacing - stackedSpacing);
+      }
+
+      ++idx;
+    }
+
+    return true;
+  }
+
+  class MListener extends MouseAdapter {
+    RayPickAction ra = new RayPickAction();
+
+    public void mousePressed(MouseEvent e) {
+      ra.setPoint(e.getX(), e.getY(), e.getComponent());
+      // Apply to the scene root
+      ra.apply(root);
+      List<PickedPoint> pickedPoints = ra.getPickedPoints();
+      Path p = null;
+      if (!pickedPoints.isEmpty())
+        p = pickedPoints.get(0).getPath();
+      if (p != null && p.size() > 1) {
+        int idx = imageRoot.findChild(p.get(p.size() - 2));
+        if (idx >= 0) {
+          setTargetIndex(idx);
+          // Need to keep the slider and this mechanism in sync
+          // FIXME: fire an event here
+          //          slider.setValue(idx);
+        }
+      }
+    }
+  }
+}