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/*
** 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.
**
** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
*/
/*
** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/nurbtess/directedLine.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
*/
#ifndef _DIRECTEDLINE_H
#define _DIRECTEDLINE_H
#include "definitions.h"
#include "sampledLine.h"
enum {INCREASING, DECREASING};
class directedLine {
short direction; /*INCREASING or DECREASING*/
sampledLine* sline;
directedLine* next; /*double linked list*/
directedLine* prev; /*double linked list*/
/*in case we need a list of polygons each
*consisting of a double linked list
*/
directedLine* nextPolygon;
/*optimization make cutoff polygon faster*/
/* directedLine* prevPolygon;*/
Int rootBit; /*1 if this is a root of the polygon, set by setRootBit*/
/*and reset by resetRootBit()*/
directedLine* rootLink; /*fast root-finding*/
public:
directedLine(short dir, sampledLine* sl);
directedLine();
~directedLine();
void init(short dir, sampledLine* sl);
Real* head(); /*points[0] if INCREASING, points[n-1] otherwise*/
Real* tail(); /*points[n-1] if INCREASING, points[0] otherwise*/
Real* getVertex(Int i); /*points[i] if INCREASING, points[n-1-i] otherwise*/
Int get_npoints() {return sline->get_npoints();}
directedLine* getPrev() {return prev;}
directedLine* getNext() {return next;}
directedLine* getNextPolygon() {return nextPolygon;}
sampledLine* getSampledLine() {return sline;}
short getDirection(){return direction;}
void putDirection(short dir) {direction = dir;}
void putPrev(directedLine *p) {prev = p;}
void putNext(directedLine *p) {next = p;}
/*insert a new line between prev and this*/
void insert(directedLine* nl);
/*delete all the polygons following the link: nextPolygon.
*notice that sampledLine is not deleted. The caller is
*responsible for that
*/
void deletePolygonList();
void deleteSinglePolygon();
void deleteSinglePolygonWithSline(); //also delete sanmpled line
void deletePolygonListWithSline(); //also delete sanmpled line
void deleteSingleLine(directedLine* dline);
directedLine* deleteDegenerateLines();
directedLine* deleteDegenerateLinesAllPolygons();
directedLine* cutIntersectionAllPoly(int& cutOccur);
/*check to see if the list forms a closed polygon
*return 1 if yes
*/
short isPolygon();
Int compInY(directedLine* nl);
Int compInX(directedLine* nl);
/*return an array of pointers.
*the
*/
directedLine** sortAllPolygons();
Int numEdges();
Int numEdgesAllPolygons();
Int numPolygons();
/*check if the head of this edge is connected to
*the tail of the prev
*/
short isConnected();
Real polyArea();
void printSingle();
void printList();
void printAllPolygons();
void writeAllPolygons(char* filename);
/*insert a polygon: using nextPolygon*/
directedLine* insertPolygon(directedLine* newpolygon);
directedLine* cutoffPolygon(directedLine *p);
Int toArraySinglePolygon(directedLine** array, Int index);
directedLine** toArrayAllPolygons(Int& total_num_edges);
void connectDiagonal(directedLine* v1, directedLine* v2,
directedLine** ret_p1,
directedLine** ret_p2,
sampledLine** generatedLine, directedLine* list);
/*generate two slines
*/
void connectDiagonal_2slines(directedLine* v1, directedLine* v2,
directedLine** ret_p1,
directedLine** ret_p2,
directedLine* list);
Int samePolygon(directedLine* v1, directedLine* v2);
void setRootBit() {rootBit = 1;}
void resetRootBit() {rootBit = 0;}
directedLine* findRoot();
void rootLinkSet(directedLine* r) {rootLink = r;}
directedLine* rootLinkFindRoot();
//the chain from begin to end is deleted (the space is deallocated)
//and a new edge(which connectes the head of begin and the tail of end)
// is inserted. The new polygon is returned.
//notice that "this" is arbitrary
directedLine* deleteChain(directedLine* begin, directedLine* end);
};
directedLine* readAllPolygons(char* filename);
extern Int compV2InY(Real A[2], Real B[2]);
extern Int compV2InX(Real A[2], Real B[2]);
#endif
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