Boundary.cpp

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/****************************************************************************/
// A class that stores the 2D geometrical boundary
/****************************************************************************/
// SUMO, Simulation of Urban MObility; see http://sumo.sourceforge.net/
// Copyright 2001-2010 DLR (http://www.dlr.de/) and contributors
/****************************************************************************/
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation; either version 2 of the License, or
//   (at your option) any later version.
//
/****************************************************************************/


// ===========================================================================
// included modules
// ===========================================================================
#ifdef _MSC_VER
#include <windows_config.h>
#else
#include <config.h>
#endif
#include <utility>

#include "GeomHelper.h"
#include "Boundary.h"
#include "Position2DVector.h"
#include "Position2D.h"

#ifdef CHECK_MEMORY_LEAKS
#include <foreign/nvwa/debug_new.h>
#endif // CHECK_MEMORY_LEAKS


// ===========================================================================
// method definitions
// ===========================================================================
Boundary::Boundary()
        : myXmin(10000000000.0), myXmax(-10000000000.0),
        myYmin(10000000000.0), myYmax(-10000000000.0),
        myWasInitialised(false) {}


Boundary::Boundary(SUMOReal x1, SUMOReal y1, SUMOReal x2, SUMOReal y2)
        : myXmin(10000000000.0), myXmax(-10000000000.0),
        myYmin(10000000000.0), myYmax(-10000000000.0),
        myWasInitialised(false) {
    add(x1, y1);
    add(x2, y2);
}


Boundary::~Boundary() {}


void
Boundary::reset() {
    myXmin = 10000000000.0;
    myXmax = -10000000000.0;
    myYmin = 10000000000.0;
    myYmax = -10000000000.0;
    myWasInitialised = false;
}


void
Boundary::add(SUMOReal x, SUMOReal y) {
    if (!myWasInitialised) {
        myYmin = y;
        myYmax = y;
        myXmin = x;
        myXmax = x;
    } else {
        myXmin = myXmin < x ? myXmin : x;
        myXmax = myXmax > x ? myXmax : x;
        myYmin = myYmin < y ? myYmin : y;
        myYmax = myYmax > y ? myYmax : y;
    }
    myWasInitialised = true;
}


void
Boundary::add(const Position2D &p) {
    add(p.x(), p.y());
}


void
Boundary::add(const Boundary &p) {
    add(p.xmin(), p.ymin());
    add(p.xmax(), p.ymax());
}


Position2D
Boundary::getCenter() const {
    return Position2D((myXmin+myXmax)/(SUMOReal) 2.0, (myYmin+myYmax)/(SUMOReal) 2.0);
}


SUMOReal
Boundary::xmin() const {
    return myXmin;
}


SUMOReal
Boundary::xmax() const {
    return myXmax;
}


SUMOReal
Boundary::ymin() const {
    return myYmin;
}


SUMOReal
Boundary::ymax() const {
    return myYmax;
}


SUMOReal
Boundary::getWidth() const {
    return myXmax - myXmin;
}


SUMOReal
Boundary::getHeight() const {
    return myYmax - myYmin;
}


bool
Boundary::around(const Position2D &p, SUMOReal offset) const {
    return
        (p.x()<=myXmax+offset && p.x()>=myXmin-offset) &&
        (p.y()<=myYmax+offset && p.y()>=myYmin-offset);
}


bool
Boundary::overlapsWith(const AbstractPoly &p, SUMOReal offset) const {
    if (
        // check whether one of my points lies within the given poly
        partialWithin(p, offset) ||
        // check whether the polygon lies within me
        p.partialWithin(*this, offset)) {
        return true;
    }
    // check whether the bounderies cross
    return
        p.crosses(Position2D(myXmax+offset, myYmax+offset), Position2D(myXmin-offset, myYmax+offset))
        ||
        p.crosses(Position2D(myXmin-offset, myYmax+offset), Position2D(myXmin-offset, myYmin-offset))
        ||
        p.crosses(Position2D(myXmin-offset, myYmin-offset), Position2D(myXmax+offset, myYmin-offset))
        ||
        p.crosses(Position2D(myXmax+offset, myYmin-offset), Position2D(myXmax+offset, myYmax+offset));
}


bool
Boundary::crosses(const Position2D &p1, const Position2D &p2) const {
    return
        GeomHelper::intersects(p1, p2, Position2D(myXmax, myYmax), Position2D(myXmin, myYmax))
        ||
        GeomHelper::intersects(p1, p2, Position2D(myXmin, myYmax), Position2D(myXmin, myYmin))
        ||
        GeomHelper::intersects(p1, p2, Position2D(myXmin, myYmin), Position2D(myXmax, myYmin))
        ||
        GeomHelper::intersects(p1, p2, Position2D(myXmax, myYmin), Position2D(myXmax, myYmax));
}


bool
Boundary::partialWithin(const AbstractPoly &poly, SUMOReal offset) const {
    return
        poly.around(Position2D(myXmax, myYmax), offset) ||
        poly.around(Position2D(myXmin, myYmax), offset) ||
        poly.around(Position2D(myXmax, myYmin), offset) ||
        poly.around(Position2D(myXmin, myYmin), offset);
}


Boundary &
Boundary::grow(SUMOReal by) {
    myXmax += by;
    myYmax += by;
    myXmin -= by;
    myYmin -= by;
    return *this;
}


void
Boundary::flipY() {
    myYmin *= -1.0;
    myYmax *= -1.0;
    SUMOReal tmp = myYmin;
    myYmin = myYmax;
    myYmax = tmp;
}



std::ostream &
operator<<(std::ostream &os, const Boundary &b) {
    os << b.myXmin << "," << b.myYmin << "," << b.myXmax << "," << b.myYmax;
    return os;
}


void
Boundary::set(SUMOReal xmin, SUMOReal ymin, SUMOReal xmax, SUMOReal ymax) {
    myXmin = xmin;
    myYmin = ymin;
    myXmax = xmax;
    myYmax = ymax;
}


void
Boundary::moveby(SUMOReal x, SUMOReal y) {
    myXmin += x;
    myYmin += y;
    myXmax += x;
    myYmax += y;
}



/****************************************************************************/