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/*
* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice including the dates of first publication and
* either this permission notice or a reference to
* http://oss.sgi.com/projects/FreeB/
* shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of Silicon Graphics, Inc.
* shall not be used in advertising or otherwise to promote the sale, use or
* other dealings in this Software without prior written authorization from
* Silicon Graphics, Inc.
*/
/*
** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/nurbtess/monoChain.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
*/
#ifndef _MONO_CHAIN_H
#define _MONO_CHAIN_H
#include "directedLine.h"
#include "partitionY.h"
class monoChain;
class monoChain{
directedLine* chainHead;
directedLine* chainTail;
monoChain* next;
monoChain* prev;
monoChain* nextPolygon; //a list of polygons
//cached informatin
//bounding box
Real minX, maxX, minY, maxY;
Int isIncrease;
//for efficiently comparing two chains
directedLine* current;
public:
monoChain(directedLine* cHead, directedLine* cTail);
~monoChain() {}
inline void setNext(monoChain* n) {next = n;}
inline void setPrev(monoChain* p) {prev = p;}
inline void setNextPolygon(monoChain* np) {nextPolygon = np;}
inline monoChain* getNext() {return next;}
inline monoChain* getPrev() {return prev;}
inline directedLine* getHead() {return chainHead;}
inline directedLine* getTail() {return chainTail;}
inline void resetCurrent() { current = ((isIncrease==1)? chainHead:chainTail);}
void deleteLoop();
void deleteLoopList();
//insert a new chain between prev and this
void insert(monoChain* nc);
Int numChainsSingleLoop();
Int numChainsAllLoops();
monoChain** toArrayAllLoops(Int& num_chains);
Int toArraySingleLoop(monoChain** array, Int index);
Int isKey;
Real keyY; //the current horizotal line
Real chainIntersectHoriz(Real y); //updates current incrementally for efficiency
directedLine* find(Real y);//find dline so that y intersects dline.
void printOneChain();
void printChainLoop();
void printAllLoops();
};
monoChain* directedLineLoopToMonoChainLoop(directedLine* loop);
monoChain* directedLineLoopListToMonoChainLoopList(directedLine* list);
Int MC_sweepY(Int nVertices, monoChain** sortedVertices, sweepRange** ret_ranges);
void MC_findDiagonals(Int total_num_edges, monoChain** sortedVertices,
sweepRange** ranges, Int& num_diagonals,
directedLine** diagonal_vertices);
directedLine* MC_partitionY(directedLine *polygons, sampledLine **retSampledLines);
#endif
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