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coord.h

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/**
 *  \file
 *  \brief Defines the Coord "real" type with sufficient precision for coordinates.
 *
 * Copyright 2006 Nathan Hurst <njh@mail.csse.monash.edu.au>
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 */

#ifndef SEEN_Geom_COORD_H
#define SEEN_Geom_COORD_H

#include <cmath>
#include <limits>

namespace Geom {

/**
 * A "real" type with sufficient precision for coordinates.
 *
 * You may safely assume that double (or even float) provides enough precision for storing
 * on-canvas points, and hence that double provides enough precision for dot products of
 * differences of on-canvas points.
 */
typedef double Coord;

const Coord EPSILON = 1e-5; //1e-18;

inline Coord infinity() {  return std::numeric_limits<Coord>::infinity();  }

//IMPL: NearConcept
inline bool are_near(Coord a, Coord b, double eps=EPSILON) { return fabs(a-b) <= eps; }

} /* namespace Geom */


#endif /* !SEEN_Geom_COORD_H */

/*
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  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
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  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :

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