geocircle.h

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#pragma once

#include "cad/const.h"
#include "geocoordinate.h"
#include "geobase.h"
#include <vector>
#include <cad/interface/tangentable.h>
#include "cad/math/equation.h"
namespace lc {
    namespace geo {
        // TODO: Should Circle be a arc with a start angle of 0 and a stop angle of 2PI ?
        class Circle : public Base, virtual public Visitable, public Tangentable {
            public:
                Circle(const Coordinate& center, double radius);

                const Coordinate center() const;

                double radius() const;

                Coordinate nearestPointOnPath(const Coordinate& coord) const;
                Coordinate nearestPointOnEntity(const Coordinate& coord) const;

                const maths::Equation equation() const {
                    return maths::Equation(1., 0.,1., 0., 0., -_radius* _radius).move(_center);
                }

                virtual void accept(GeoEntityVisitor &v) const override { v.visit(*this); }

                virtual std::vector<Coordinate> lineTangentPointsOnEntity(const lc::geo::Coordinate& extPoint) override;

            private:
                friend std::ostream& operator<<(std::ostream& os, const Circle& c) {
                    os << "Circle(center=" << c._center << " radius" << c._radius << ")";
                    return os;
                }
            private:
                const Coordinate _center; 
                const double _radius; 
        };
    }
}