/**
 * \file
 * \brief Template concepts used by 2Geom
 *//*
 * Copyright 2007 Michael Sloan <mgsloan@gmail.com>
 *
 * 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, output 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 LIB2GEOM_SEEN_CONCEPTS_H
#define LIB2GEOM_SEEN_CONCEPTS_H

#include <2geom/sbasis.h>
#include <2geom/interval.h>
#include <2geom/point.h>
#include <2geom/rect.h>
#include <2geom/intersection.h>
#include <vector>
#include <boost/concept/assert.hpp>
#include <2geom/forward.h>
#include <2geom/transforms.h>

namespace Geom {

//forward decls
template <typename T> struct ResultTraits;

template <> struct ResultTraits<double> {
  typedef OptInterval bounds_type;
  typedef SBasis sb_type;
};

template <> struct ResultTraits<Point> {
  typedef OptRect bounds_type;
  typedef D2<SBasis> sb_type;
};

//A concept for one-dimensional functions defined on [0,1]
template <typename T>
struct FragmentConcept {
    typedef typename T::output_type                        OutputType;
    typedef typename ResultTraits<OutputType>::bounds_type BoundsType;
    typedef typename ResultTraits<OutputType>::sb_type     SbType;
    T t;
    double d;
    OutputType o;
    bool b;
    BoundsType i;
    Interval dom;
    std::vector<OutputType> v;
    unsigned u;
    SbType sb;
    void constraints() {
        t = T(o);
        b = t.isZero(d);
        b = t.isConstant(d);
        b = t.isFinite();
        o = t.at0();
        o = t.at1();
        t.at0() = o;
        t.at1() = o;
        o = t.valueAt(d);
        o = t(d);
        v = t.valueAndDerivatives(d, u-1);
        //Is a pure derivative (ignoring others) accessor ever much faster?
        //u = number of values returned. first val is value.
        sb = t.toSBasis();
        t = reverse(t);
        i = bounds_fast(t);
        i = bounds_exact(t);
        i = bounds_local(t, dom);
        /*With portion, Interval makes some sense, but instead I'm opting for
          doubles, for the following reasons:
          A) This way a reversed portion may be specified
          B) Performance might be a bit better for piecewise and such
          C) Interval version provided below
         */
        t = portion(t, d, d);
    }
};

template <typename T>
struct ShapeConcept {
    typedef typename ShapeTraits<T>::TimeType Time;
    typedef typename ShapeTraits<T>::IntervalType Interval;
    typedef typename ShapeTraits<T>::AffineClosureType AffineClosure;
    typedef typename ShapeTraits<T>::IntersectionType Isect;

    T shape, other;
    Time t;
    Point p;
    AffineClosure ac;
    Affine m;
    Translate tr;
    Coord c;
    bool bool_;
    std::vector<Isect> ivec;

    void constraints() {
        p = shape.pointAt(t);
        c = shape.valueAt(t, X);
        ivec = shape.intersect(other);
        t = shape.nearestTime(p);
        shape *= tr;
        ac = shape;
        ac *= m;
        bool_ = (shape == shape);
        bool_ = (shape != other);
        bool_ = shape.isDegenerate();
        //bool_ = are_near(shape, other, c);
    }
};

template <typename T>
inline T portion(const T& t, const Interval& i) { return portion(t, i.min(), i.max()); }

template <typename T>
struct EqualityComparableConcept {
    T a, b;
    bool bool_;
    void constraints() {
        bool_ = (a == b);
        bool_ = (a != b);
    }
};

template <typename T>
struct NearConcept {
    T a, b;
    double tol;
    bool res;
    void constraints() {
        res = are_near(a, b, tol);
    }
};

template <typename T>
struct OffsetableConcept {
    T t;
    typename T::output_type d;
    void constraints() {
        t = t + d; t += d;
        t = t - d; t -= d;
    }
};

template <typename T>
struct ScalableConcept {
    T t;
    typename T::output_type d;
    void constraints() {
        t = -t;
        t = t * d; t *= d;
        t = t / d; t /= d;
    }
};

template <typename T>
struct AddableConcept {
    T i, j;
    void constraints() {
        i += j; i = i + j;
        i -= j; i = i - j;
    }
};

template <typename T>
struct MultiplicableConcept {
    T i, j;
    void constraints() {
        i *= j; i = i * j;
    }
};

} // end namespace Geom

#endif // LIB2GEOM_SEEN_CONCEPTS_H

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :