rect.h

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 *   Copyright (C) 2005-2019 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
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 *   Free Software Foundation, Inc.,                                       *
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/***************************************************************************

    Rectangle intersection code copied and modified from the guichan 0.4
    source, which is released under the BSD license.

    Copyright (c) 2004, 2005, 2006 Olof Naessén and Per Larsson All rights reserved.

    * Redistribution and use in source and binary forms, with or without modification,
      are permitted provided that the following conditions are met:
      Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.

    * Neither the name of the Guichan nor the names of its contributors may be used
      to endorse or promote products derived from this software without specific
      prior written permission.

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 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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    For more Information about guichan see: http://guichan.sourceforge.net

****************************************************************************/

#ifndef FIFE_VIDEO_RECT_H
#define FIFE_VIDEO_RECT_H

// Standard C++ library includes
#include <iostream>

// 3rd party library includes

// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "point.h"

namespace FIFE {

    template <typename T>
    class RectType {
        public:
            T x;
            T y;
            T w;
            T h;

            explicit RectType(T x = 0, T y = 0, T w = 0, T h = 0) : x(x), y(y), w(w), h(h) {
            }

            template<typename U>
            explicit RectType(const RectType<U>& r)
                : x(static_cast<T>(r.x)),
                y(static_cast<T>(r.y)),
                w(static_cast<T>(r.w)),
                h(static_cast<T>(r.h)) {
            }

            T right() const;

            T bottom() const;

            bool operator==(const RectType<T>& rect ) const;

            bool contains( const PointType2D<T>& point ) const;

            bool intersects( const RectType<T>& rect ) const;

            bool intersectInplace( const RectType<T>& rect );
    };

    template<typename T>
    std::ostream& operator<<(std::ostream& os, const RectType<T>& r) {
        return
            os << "("<<r.x<<","<<r.y<<")-("<<r.w<<","<<r.h<<")";
    }


    template<typename T>
    inline T RectType<T>::right() const {
        return x + w;
    }

    template<typename T>
    inline T RectType<T>::bottom() const {
        return y + h;
    }

    template<typename T>
    inline bool RectType<T>::operator==(const RectType<T>& rect ) const {
        return
            x == rect.x && y == rect.y && w == rect.w && h == rect.h;
    }

    template<typename T>
    inline bool RectType<T>::contains( const PointType2D<T>& point ) const {
        return
            (((point.x >= x) && (point.x <= x + w))
                && ((point.y >= y) && (point.y <= y + h)));
    }


    template<typename T>
    inline bool RectType<T>::intersectInplace( const RectType<T>& rectangle ) {
        x = x - rectangle.x;
        y = y - rectangle.y;


        if (x < 0) {
            w += x;
            x = 0;
        }

        if (y < 0) {
            h += y;
            y = 0;
        }

        if (x + w > rectangle.w) {
            w = rectangle.w - x;
        }

        if (y + h > rectangle.h) {
            h = rectangle.h - y;
        }

        x += rectangle.x;
        y += rectangle.y;

        if (w <= 0 || h <= 0) {
            h = 0;
            w = 0;
            return false;
        }
        return true;
    }

    template<typename T>
    inline bool RectType<T>::intersects( const RectType<T>& rectangle ) const {
        T _x = x - rectangle.x;
        T _y = y - rectangle.y;
        T _w = w;
        T _h = h;


        if (_x < 0) {
            _w += _x;
            _x = 0;
        }

        if (_y < 0) {
            _h += _y;
            _y = 0;
        }

        if (_x + _w > rectangle.w) {
            _w = rectangle.w - _x;
        }

        if (_y + _h > rectangle.h) {
            _h = rectangle.h - _y;
        }

        if (_w <= 0 || _h <= 0) {
            return false;
        }
        return true;
    }

    typedef RectType<int32_t> Rect;
    typedef RectType<float> FloatRect;
    typedef RectType<double> DoubleRect;


}

#endif