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package jogamp.opengl.glu.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 2.0 (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.
*/
/**
* Class holding trimming arcs
* @author Tomas Hrasky
*
*/
public class Bin {
/**
* Head of linked list of arcs
*/
private Arc head;
/**
* Current arc
*/
private Arc current;
/**
* Indicates whether there are any Arcs in linked list
* @return true if there are any Arcs in linked list
*/
public boolean isnonempty() {
// DONE
return this.head != null ? true : false;
}
/**
* Adds and arc to linked list
* @param jarc added arc
*/
public void addarc(Arc jarc) {
// DONE
// if (head == null)
// head = jarc;
// else {
jarc.link = head;
head = jarc;
// }
}
/**
* Returns number of arcs in linked list
* @return number of arcs
*/
public int numarcs() {
// DONE
int count = 0;
for (Arc jarc = firstarc(); jarc != null; jarc = nextarc())
count++;
return count;
}
/**
* Removes first arc in list
* @return new linked list head
*/
public Arc removearc() {
// DONE
Arc jarc = head;
if (jarc != null)
head = jarc.link;
return jarc;
}
/**
* Consolidates linked list
*/
public void adopt() {
// DONE
markall();
Arc orphan;
while ((orphan = removearc()) != null) {
for (Arc parent = orphan.next; !parent.equals(orphan); parent = parent.next) {
if (!parent.ismarked()) {
orphan.link = parent.link;
parent.link = orphan;
orphan.clearmark();
break;
}
}
}
}
/**
* Marks all arc in linked list
*/
private void markall() {
// DONE
for (Arc jarc = firstarc(); jarc != null; jarc = nextarc())
jarc.setmark();
}
/**
* Returns first arc in linked list
* @return first arc in linked list
*/
private Arc firstarc() {
// DONE
current = head;
return nextarc();
}
/**
* Returns next arc in linked list
* @return next arc
*
*/
private Arc nextarc() {
// DONE
Arc jarc = current;
if (jarc != null)
current = jarc.link;
return jarc;
}
}
