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diff --git a/src/gleem/Translate2Manip.java b/src/gleem/Translate2Manip.java
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+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder may not 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, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, SUN AND SUN'S 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 THE
+ * COPYRIGHT HOLDER, SUN OR SUN'S 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 ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem;
+
+import java.util.*;
+
+import gleem.linalg.*;
+import javax.media.opengl.*;
+
+/** A Translate2Manip is a Manip which translates in two dimensions and
+    whose default representation is two arrows. */
+
+public class Translate2Manip extends Manip {
+  private ManipPart parts;
+  private Vec3f translation;
+  /** Normalized */
+  private Vec3f normal;
+  private Vec3f scale;
+  /** Local-to-world transform for geometry */
+  private Mat4f xform;
+
+  /** Dragging state */
+  private Plane dragPlane;
+  /** Dragging state */
+  private Vec3f dragOffset;
+
+  public Translate2Manip() {
+    parts       = createGeometry();
+    translation = new Vec3f(0, 0, 0);
+    normal      = new Vec3f(0, 1, 0);
+    scale       = new Vec3f(1, 1, 1);
+    xform	= new Mat4f();
+    dragPlane	= new Plane();
+    dragOffset  = new Vec3f();
+    recalc();
+  }
+  
+  /** Set the translation of this Translate2Manip. This moves its
+      on-screen representation. Manipulations cause the translation to
+      be modified, not overwritten, so if you want the default
+      Translate2Manip to go through the point (0, 1, 0) but still
+      translate in the X-Z plane, then setTranslation(0, 1, 0). */
+  public void setTranslation(Vec3f translation) {
+    this.translation.set(translation);
+    recalc();
+  }
+
+  /** Get the translation of this Translate2Manip. This corresponds to
+      the center of its body. */
+  public Vec3f getTranslation() {
+    return new Vec3f(translation);
+  }
+
+  /** Set the normal of this Translate2Manip. The manip moves in the
+      plane containing its current position and perpendicular to this
+      normal. Does not need to be normalized, but must not be the zero
+      vector. */
+  public void setNormal(Vec3f normal) {
+    this.normal.set(normal);
+    this.normal.normalize();
+    recalc();
+  }
+
+  /** Get the normal of this Translate2Manip. */
+  public Vec3f getNormal() {
+    return new Vec3f(normal);
+  }
+  
+  /** Set the scale of the Translate2Manip. This only affects the size
+      of the on-screen geometry. */
+  public void setScale(Vec3f scale) {
+    this.scale.set(scale);
+    recalc();
+  }
+
+  public Vec3f getScale() {
+    return new Vec3f(scale);
+  }
+
+  /** Change the geometry of this manipulator to be the user-defined
+      piece. */
+  public void replaceGeometry(ManipPart geom) {
+    parts = geom;
+  }
+
+  public void intersectRay(Vec3f rayStart,
+			   Vec3f rayDirection,
+			   List results) {
+    parts.intersectRay(rayStart, rayDirection, results, this);
+  }
+
+  public void highlight(HitPoint hit) {
+    if (hit.manipPart != parts) {
+      throw new RuntimeException("My old geometry disappeared; how did this happen?");
+    }
+    parts.highlight();
+  }
+  
+  public void clearHighlight() {
+    parts.clearHighlight();
+  }
+
+  public void makeActive(HitPoint hit) {
+    parts.highlight();
+    dragPlane.setNormal(normal);
+    dragPlane.setPoint(hit.intPt.getIntersectionPoint());
+    dragOffset.sub(translation, hit.intPt.getIntersectionPoint());
+  }
+
+  public void drag(Vec3f rayStart,
+		   Vec3f rayDirection) {
+    // Algorithm: Find intersection of ray with dragPlane. Add
+    // dragOffset to this point to get new translation.
+    IntersectionPoint intPt = new IntersectionPoint();
+    if (dragPlane.intersectRay(rayStart,
+                               rayDirection,
+                               intPt) == false) {
+      // Ray is parallel to plane. Punt.
+      return;
+    }
+    translation.set(intPt.getIntersectionPoint());
+    translation.add(dragOffset);
+    recalc();
+    super.drag(rayStart, rayDirection);
+  }
+
+  public void makeInactive() {
+    parts.clearHighlight();
+  }
+  
+  public void render(GL2 gl) {
+    parts.render(gl);
+  }
+
+  private ManipPart createGeometry() {
+    ManipPartGroup group = new ManipPartGroup();
+    ManipPartTwoWayArrow arrow1 = new ManipPartTwoWayArrow();
+    group.addChild(arrow1);
+    ManipPartTransform xform = new ManipPartTransform();
+    Mat4f rotMat = new Mat4f();
+    rotMat.makeIdent();
+    rotMat.set(0, 0, 0);
+    rotMat.set(1, 0, 0);
+    rotMat.set(2, 0, -1);
+    rotMat.set(0, 2, 1);
+    rotMat.set(1, 2, 0);
+    rotMat.set(2, 2, 0);
+    xform.setOffsetTransform(rotMat);
+    ManipPartTwoWayArrow arrow2 = new ManipPartTwoWayArrow();
+    xform.addChild(arrow2);
+    group.addChild(xform);
+    return group;
+  }
+
+  private void recalc() {
+    // Construct local to world transform for geometry.
+    // Scale, Rotation, Translation. Since we're right multiplying
+    // column vectors, the actual matrix composed is TRS.
+    Mat4f scaleMat = new Mat4f();
+    Mat4f rotMat   = new Mat4f();
+    Mat4f xlateMat = new Mat4f();
+    Mat4f tmpMat   = new Mat4f();
+    scaleMat.makeIdent();
+    scaleMat.set(0, 0, scale.x());
+    scaleMat.set(1, 1, scale.y());
+    scaleMat.set(2, 2, scale.z());
+    // Perpendiculars
+    Vec3f p0 = new Vec3f();
+    Vec3f p1 = new Vec3f();
+    MathUtil.makePerpendicular(normal, p0);
+    p1.cross(normal, p0);
+    // p1, normal, p0 correspond to x, y, z
+    p0.normalize();
+    p1.normalize();
+    rotMat.makeIdent();
+    rotMat.set(0, 0, p1.x());
+    rotMat.set(1, 0, p1.y());
+    rotMat.set(2, 0, p1.z());
+    rotMat.set(0, 1, normal.x());
+    rotMat.set(1, 1, normal.y());
+    rotMat.set(2, 1, normal.z());
+    rotMat.set(0, 2, p0.x());
+    rotMat.set(1, 2, p0.y());
+    rotMat.set(2, 2, p0.z());
+    xlateMat.makeIdent();
+    xlateMat.set(0, 3, translation.x());
+    xlateMat.set(1, 3, translation.y());
+    xlateMat.set(2, 3, translation.z());
+    tmpMat.mul(xlateMat, rotMat);
+    xform.mul(tmpMat, scaleMat);
+    parts.setTransform(xform);
+  }
+}