pointset_math.h

/*
**  UICore
**  Copyright (c) 1997-2015 The UICore Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries UICore may link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Emanuel Griesen
**    Harry Storbacka
*/

#pragma once

#include <vector>
#include "point.h"
#include "circle.h"
#include "rect.h"

namespace uicore
{
    class PointSetMath
    {
    public:
        static Circlef minimum_enclosing_disc(
            const std::vector<Pointf> &points);

        static std::vector<Pointf> convex_hull_from_polygon(std::vector<Pointf> &points);

        static Rect bounding_box(const std::vector<Pointf> &points);

    private:
        static void calculate_minimum_enclosing_disc(
            Circlef &smalldisc,
            const std::vector<Pointf> &points,
            int start,
            int end);

        static void minimum_disc_with_1point(
            Circlef &smalldisc,
            const std::vector<Pointf> &points,
            int start,
            unsigned int i);

        static void minimum_disc_with_2points(
            Circlef &smalldisc,
            const std::vector<Pointf> &points,
            int start,
            unsigned int i,
            unsigned int j);

        static void minimum_disc_with_3points(
            Circlef &smalldisc,
            const std::vector<Pointf> &points,
            unsigned int i,
            unsigned int j,
            unsigned int k);

        friend class OutlineMath;
    };
}