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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.
*/
/*
*/
#ifndef _MONO_TRIANGULATION_H
#define _MONO_TRIANGULATION_H
#include "definitions.h"
#include "primitiveStream.h"
#include "directedLine.h"
#include "arc.h"
class Backend;
class reflexChain{
Real2 *queue;
/*the order of the polygon vertices: either q[0],q[1].., or
* q[n-1], q[n-2], ..., q[0]
*this order determines the interior of the polygon, so it
*also used to determines whether a chain is reflex or convex
*/
Int isIncreasing;
Int index_queue;
Int size_queue; /*allocated size*/
public:
reflexChain(Int size, Int isIncreasing);
~reflexChain();
void insert(Real u, Real v);
void insert(Real v[2]);
void processNewVertex(Real v[2], primStream* pStream);
void outputFan(Real v[2], primStream* pStream);
void processNewVertex(Real v[2], Backend* backend);
void outputFan(Real v[2], Backend* backend);
void print();
};
/*dynamic array of pointers to reals.
*Intended to store an array of (u,v).
*Notice that it doesn't allocate or dealocate the space
*for the (u,v) themselfs. So it assums that someone else
*is taking care of them, while this class only plays with
*the pointers.
*/
class vertexArray{
Real** array;
Int index;
Int size;
public:
vertexArray(Int s);
vertexArray(Real vertices[][2], Int nVertices);
~vertexArray();
void appendVertex(Real* ptr); /*the content (pointed by ptr is NOT copied*/
Real* getVertex(Int i) {return array[i];}
Real** getArray() {return array;}
Int getNumElements() {return index;}
Int findIndexAbove(Real v);
Int findIndexAboveGen(Real v, Int startIndex, Int EndIndex);
Int findIndexBelowGen(Real v, Int startIndex, Int EndIndex);
Int findIndexStrictBelowGen(Real v, Int startIndex, Int EndIndex);
Int findIndexFirstAboveEqualGen(Real v, Int startIndex, Int endIndex);
Int skipEqualityFromStart(Real v, Int start, Int end);
//return i such that fron [i+1, end] is strictly U-monotone (left to right
Int findDecreaseChainFromEnd(Int begin, Int end);
void print();
};
void monoTriangulation(directedLine* monoPolygon, primStream* pStream);
void monoTriangulationRec(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
primStream* pStream);
void monoTriangulationRec(directedLine* inc_chain, Int inc_index,
directedLine* dec_chain, Int dec_index,
directedLine* topVertex, Int top_index,
directedLine* botVertex,
primStream* pStream);
/*the chain could be increasing or decreasing, although we use the
* name inc_chain.
*the argument is_increase_chain indicates whether this chain
*is increasing (left chain in V-monotone case) or decreaing (right chain
*in V-monotone case).
*/
void monoTriangulation2(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_smallIndex,
Int inc_largeIndex,
Int is_increase_chain,
primStream* pStream);
void monoTriangulationRecGen(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
primStream* pStream);
void monoTriangulationRecGenOpt(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
primStream* pStream);
void triangulateXYMonoTB(Int n_left, Real** leftVerts,
Int n_right, Real** rightVerts,
primStream* pStream);
void monoTriangulationRecGenTBOpt(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
primStream* pStream);
void monoTriangulationRecOpt(Real* topVertex, Real* botVertex,
vertexArray* left_chain, Int left_current,
vertexArray* right_chain, Int right_current,
primStream* pStream);
void monoTriangulationRecFunGen(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
Int (*compFun)(Real*, Real*),
primStream* pStream);
void monoTriangulationRecFun(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
Int (*compFun)(Real*, Real*),
primStream* pStream);
void monoTriangulationFun(directedLine* monoPolygon,
Int (*compFun)(Real*, Real*), primStream* pStream);
void monoTriangulationRec(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
Backend* backend);
void monoTriangulationFunBackend(Arc_ptr loop, Int (*compFun)(Real*, Real*), Backend* backend);
void monoTriangulationRecFunBackend(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
Int (*compFun)(Real*, Real*),
Backend* backend);
void monoTriangulationOpt(directedLine* poly, primStream* pStream);
#endif
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