geotoolbox.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
 *             ##   ##  ##   ##  ##      ##      ##     ##
 *            ##   ##  ##   ##  ##      ##      ##     ##
 *            #####    #####   ##      ######  ##     ##
 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef geotoolbox_h
#define geotoolbox_h
 
#include <list>
#include <cstdlib>
 
#include "oofemenv.h"
#include "floatarray.h"
 
#ifdef __OOFEG
 #include "oofeggraphiccontext.h"
#endif
 
namespace oofem {
 
#define GT_EPS 1.e-12
// zero for parallel lines test
#define GT_TEPS 1.e-16
 

class OOFEM_EXPORT Vertex
{
public:
    FloatArray coords;
    Vertex(double x = 0, double y = 0) : coords(2) {
        coords(0) = x;
        coords(1) = y;
    }
    Vertex(double c [ 2 ]) : coords(2) {
        coords(0) = c [ 0 ];
        coords(1) = c [ 1 ];
    }
    Vertex(const Vertex & src) : coords(src.coords) { }
    Vertex &operator = ( const Vertex & src ) {
        coords = src.coords;
        return * this;
    }
    void setCoords(double x, double y) {
        coords(0) = x;
        coords(1) = y;
    }
    const FloatArray *getCoords() const { return & coords; }
};
 

class OOFEM_EXPORT Polygon
{
    std :: list< Vertex >vertices;
public:
    Polygon() { }
    void addVertex(Vertex v) { vertices.push_back(v); }
    double computeVolume() const;
    int testPoint(double x, double y) const;
    double pointDistance(double x, double y) const;
    void clear() { vertices.clear(); }
#ifdef __OOFEG
    GraphicObj *draw(oofegGraphicContext &, bool filled, int layer = OOFEG_DEBUG_LAYER);
#endif
public:
    class PolygonEdgeIterator
    {
        bool last;
        const Polygon *ptr;
        Vertex curr;
        std :: list< Vertex > :: const_iterator iter;
public:
        PolygonEdgeIterator(const Polygon * p) : ptr(NULL), iter()  {
            iter = p->vertices.begin();
            if ( iter == p->vertices.end() ) {
                last = true;
            } else {
                curr = ( * iter );
                ptr = p;
                last = false;
            }
        }
        int giveNext(Vertex &p1, Vertex &p2) {
            Vertex next;
            if ( last ) {
                return 0;
            } else {
                //next=*(++iter);
                ++iter;
                if ( iter == ptr->vertices.end() ) {
                    next = * ( ptr->vertices.begin() );
                    last = true;
                } else {
                    next = * iter;
                }
 
                p1 = curr;
                p2 = next;
                curr = next;
                return 1;
            }
        }
    };
 
    class PolygonVertexIterator
    {
        const Polygon *ptr;
        std :: list< Vertex > :: const_iterator iter;
public:
        PolygonVertexIterator(const Polygon * p) : iter() {
            iter = p->vertices.begin();
            ptr = p;
        }
        void init(const Polygon *p) {
            iter = p->vertices.begin();
            ptr = p;
        }
        int giveNext(Vertex &p1) {
            if ( iter == ptr->vertices.end() ) {
                return 0;
            } else {
                p1 = ( * iter );
            }
 
            ++iter;
            return 1;
        }
        int giveNext(const Vertex **p1) {
            if ( iter == ptr->vertices.end() ) {
                return 0;
            } else {
                * p1 = iter.operator->( );
            }
 
            ++iter;
            return 1;
        }
    };
};

class OOFEM_EXPORT Graph
{
protected:
    enum nodeStatus { NS_Vertex, NS_IntersectionVertex, NS_Intersection };
    struct node
    {
        double x, y;
        struct node *next;
        struct node *prev;
        struct node *nextPoly;     /* pointer to the next polygon */
        struct node *neighbor;     /* the corresponding intersection point */
        //int intersect;            /* 1 if an intersection point, 0 otherwise */
        nodeStatus status;
        int entry;            /* 1 if entry point (edge starting at this node is inside), -1 boundary edge, 0 otherwise */
        int visited;          /* 1 if the node has been visited, 0 otherwise */
        double alpha;          /* intersection point placement */
    };
 
    node *s, *c;
public:
    Graph() : s(NULL), c(NULL) { }
    ~Graph();
 
    void clip(Polygon &result, const Polygon &a, const Polygon &b);
protected:
    void insert(node *ins, node *first, node *last);     // insert node in graph
    node *createNode(double x, double y, node *next, node *prev, node *nextPoly,
                     node *neighbor, nodeStatus st, int entry, int visited, double alpha);
    node *next_node(node *p);     // return next node in graph
    node *prev_node(node *p);     // return prev node in graph
    node *last_node(node *p);     // returns last node in graph
    node *first(node *p);
    void  remove(node *n);
    double dist(double x1, double y1, double x2, double y2);
 
    int testIfIntersect(node *p1, node *p2, node *q1, node *q2,
                        double *alpha_p, double *alpha_q, double *xint, double *yint);
 
    int testIfCoincident(node *p1, node *p2, node *q1, node *q2, double *alpha_1, double *alpha_2);
    int testPoint(node *poly, double x, double y) const;
 
    bool belongs(node *n, node *v1, node *v2);
    bool intersectionExist(node *p1, node *p2, node *q1, node *q2);
    void removeIntersectionIfExist(node *p1, node *p2, node *q1, node *q2);
    int  vertex2IntersectionVertex(node *v, node *l1, node *l2);
    void testNewIntersectionVertexEdgeCollapse(node *v, node *l1, node *l2);
    bool testCollapsedEdge(node *p1, node *p2);
    void merge2vertex(node *v1, node *v2);
 
    void printYourself();
 
    void clear();
};
 
class OOFEM_EXPORT GT_Exception
{
    const char *msg, *file;
    int line;
 
public:
    GT_Exception(const char *file, int line) : msg(NULL), file(file), line(line) { }
    GT_Exception(const char *msg, const char *file, int line) : msg(msg), file(file), line(line) { }
    ~GT_Exception() { }
 
    void print();
};
 
#define THROW_GT_EXCEPTION() throw GT_Exception(__FILE__, __LINE__);
#define THROW_GT_EXCEPTIONM(m) throw GT_Exception(m, __FILE__, __LINE__);
} // end namespace oofem
#endif // geotoolbox_h