intersection.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright The KiCad Developers, see AUTHORS.txt for 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <variant>
#include <vector>
 
#include <math/vector2d.h>
#include <math/box2.h>
 
#include <geometry/circle.h>
#include <geometry/half_line.h>
#include <geometry/line.h>
#include <geometry/seg.h>
#include <geometry/shape_arc.h>
#include <geometry/shape_ellipse.h>
#include <geometry/shape_rect.h>

using INTERSECTABLE_GEOM = std::variant<LINE, HALF_LINE, SEG, CIRCLE, SHAPE_ARC, SHAPE_ELLIPSE, BOX2I>;

struct INTERSECTION_CONTACT
{
    bool m_Tangent = false;

    bool m_Overlapping = false;
};

struct INTERSECTION_VISITOR
{
public:
    INTERSECTION_VISITOR( const INTERSECTABLE_GEOM& aOtherGeometry,
                          std::vector<VECTOR2I>&    aIntersections );

    INTERSECTION_VISITOR( const INTERSECTABLE_GEOM& aOtherGeometry, std::vector<VECTOR2I>& aIntersections,
                          INTERSECTION_CONTACT& aContact );
 
    /*
     * One of these operator() overloads will be called by std::visit
     * as needed to visit (i.e. intersect) the geometry with the (stored)
     * other geometry.
     */
    void operator()( const SEG& aSeg ) const;
    void operator()( const LINE& aLine ) const;
    void operator()( const HALF_LINE& aLine ) const;
    void operator()( const CIRCLE& aCircle ) const;
    void operator()( const SHAPE_ARC& aArc ) const;
    void operator()( const SHAPE_ELLIPSE& aEllipse ) const;
    void operator()( const BOX2I& aArc ) const;
 
private:
    const INTERSECTABLE_GEOM& m_otherGeometry;
    std::vector<VECTOR2I>&    m_intersections;
    INTERSECTION_CONTACT*     m_contact = nullptr;
};