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111 lines
3.9 KiB
C++
111 lines
3.9 KiB
C++
/*
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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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**
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** http://oss.sgi.com/projects/FreeB
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**
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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**
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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**
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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**
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** $Date$ $Revision: 1.1 $
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*/
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/*
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** $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/nurbtess/monoChain.h,v 1.1 2004/02/02 16:39:13 navaraf Exp $
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*/
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#ifndef _MONO_CHAIN_H
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#define _MONO_CHAIN_H
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#include "directedLine.h"
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#include "partitionY.h"
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class monoChain;
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class monoChain{
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directedLine* chainHead;
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directedLine* chainTail;
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monoChain* next;
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monoChain* prev;
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monoChain* nextPolygon; //a list of polygons
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//cached informatin
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//bounding box
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Real minX, maxX, minY, maxY;
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Int isIncrease;
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//for efficiently comparing two chains
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directedLine* current;
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public:
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monoChain(directedLine* cHead, directedLine* cTail);
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~monoChain() {}
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inline void setNext(monoChain* n) {next = n;}
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inline void setPrev(monoChain* p) {prev = p;}
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inline void setNextPolygon(monoChain* np) {nextPolygon = np;}
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inline monoChain* getNext() {return next;}
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inline monoChain* getPrev() {return prev;}
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inline directedLine* getHead() {return chainHead;}
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inline directedLine* getTail() {return chainTail;}
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inline void resetCurrent() { current = ((isIncrease==1)? chainHead:chainTail);}
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void deleteLoop();
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void deleteLoopList();
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//insert a new chain between prev and this
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void insert(monoChain* nc);
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Int numChainsSingleLoop();
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Int numChainsAllLoops();
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monoChain** toArrayAllLoops(Int& num_chains);
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Int toArraySingleLoop(monoChain** array, Int index);
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Int isKey;
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Real keyY; //the current horizotal line
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Real chainIntersectHoriz(Real y); //updates current incrementally for efficiency
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directedLine* find(Real y);//find dline so that y intersects dline.
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void printOneChain();
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void printChainLoop();
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void printAllLoops();
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};
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monoChain* directedLineLoopToMonoChainLoop(directedLine* loop);
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monoChain* directedLineLoopListToMonoChainLoopList(directedLine* list);
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Int MC_sweepY(Int nVertices, monoChain** sortedVertices, sweepRange** ret_ranges);
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void MC_findDiagonals(Int total_num_edges, monoChain** sortedVertices,
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sweepRange** ranges, Int& num_diagonals,
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directedLine** diagonal_vertices);
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directedLine* MC_partitionY(directedLine *polygons, sampledLine **retSampledLines);
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#endif
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