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diff --git a/src/classes/com/sun/opengl/impl/nurbs/Arc.java b/src/classes/com/sun/opengl/impl/nurbs/Arc.java
new file mode 100755
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--- /dev/null
+++ b/src/classes/com/sun/opengl/impl/nurbs/Arc.java
@@ -0,0 +1,258 @@
+package com.sun.opengl.impl.nurbs;
+
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/**
+ * Trimming arc
+ * @author Tomas Hrasky
+ *
+ */
+class Arc {
+  /**
+   * Corresponding picewise-linear arc
+   */
+  public PwlArc pwlArc;
+
+  /**
+   * Arc type
+   */
+  private long type;
+
+  /**
+   * Arc link in linked list
+   */
+  public Arc link;
+
+  /**
+   * Previous arc
+   */
+  Arc prev;
+
+  /**
+   * Next arc
+   */
+  Arc next;
+
+  /**
+   * Corresponding berizer type arc
+   */
+  private BezierArc bezierArc;
+
+  /**
+   * Makes new arc at specified side
+   * 
+   * @param side
+   *            which side doeas this arc form
+   */
+  public Arc(int side) {
+    bezierArc = null;
+    pwlArc = null;
+    type = 0;
+    setside(side);
+    // nuid=_nuid
+  }
+
+  /**
+   * Sets side the arc is at
+   * 
+   * @param side
+   *            arc side
+   */
+  private void setside(int side) {
+    // DONE
+    clearside();
+    type |= side << 8;
+  }
+
+  /**
+   * Unsets side
+   */
+  private void clearside() {
+    // DONE
+    type &= ~(0x7 << 8);
+  }
+
+  // this one replaces enum arc_side 
+  /**
+   * Side not specified
+   */
+  public static final int ARC_NONE = 0;
+
+  /**
+   * Arc on right
+   */
+  public static final int ARC_RIGHT = 1;
+
+  /**
+   * Arc on top
+   */
+  public static final int ARC_TOP = 2;
+
+  /**
+   * Arc on left
+   */
+  public static final int ARC_LEFT = 3;
+
+  /**
+   * Arc on bottom
+   */
+  public static final int ARC_BOTTOM = 4;
+
+  /**
+   * Bezier type flag
+   */
+  private static final long BEZIER_TAG = 1 << 13;
+
+  /**
+   * Arc type flag
+   */
+  private static final long ARC_TAG = 1 << 3;
+
+  /**
+   * Tail type tag
+   */
+  private static final long TAIL_TAG = 1 << 6;
+
+  /**
+   * Appends arc to the list
+   * 
+   * @param jarc
+   *            arc to be append
+   * @return this
+   */
+  public Arc append(Arc jarc) {
+    // DONE
+    if (jarc != null) {
+      next = jarc.next;
+      prev = jarc;
+      next.prev = this;
+      prev.next = this;
+    } else {
+      next = this;
+      prev = this;
+    }
+
+    return this;
+  }
+
+  /**
+   * Unused
+   * 
+   * @return true
+   */
+  public boolean check() {
+    return true;
+  }
+
+  /**
+   * Sets bezier type flag
+   */
+  public void setbezier() {
+    // DONE
+    type |= BEZIER_TAG;
+
+  }
+
+  /**
+   * Returns tail of linked list coords
+   * 
+   * @return tail coords
+   */
+  public float[] tail() {
+    // DONE
+    return pwlArc.pts[0].param;
+  }
+
+  /**
+   * Returns head of linked list coords
+   * 
+   * @return head coords
+   */
+  public float[] head() {
+    // DONE
+    return next.pwlArc.pts[0].param;
+  }
+
+  /**
+   * Returns whether arc is marked with arc_tag
+   * 
+   * @return is arc marked with arc_tag
+   */
+  public boolean ismarked() {
+    // DONE
+    return ((type & ARC_TAG) > 0) ? true : false;
+  }
+
+  /**
+   * Cleans arc_tag flag
+   */
+  public void clearmark() {
+    // DONE
+    type &= (~ARC_TAG);
+  }
+
+  /**
+   * Sets arc_tag flag
+   */
+  public void setmark() {
+    // DONE
+    type |= ARC_TAG;
+  }
+
+  /**
+   * sets tail tag
+   */
+  public void setitail() {
+    // DONE
+    type |= TAIL_TAG;
+  }
+
+  /**
+   * Returns whether arc is marked tail
+   * 
+   * @return is tail
+   */
+  public boolean getitail() {
+    return false;
+  }
+
+  /**
+   * Unsets tail tag
+   */
+  public void clearitail() {
+    // DONE
+    type &= (~TAIL_TAG);
+  }
+}