source: GTP/trunk/Lib/Geom/OgreStuff/include/CEGUI/CEGUIRect.h @ 1809

/************************************************************************
        filename:       CEGUIRect.h
        created:        8/3/2004
        author:         Paul D Turner
        
        purpose:        Defines 'Rect' class
*************************************************************************/
/*************************************************************************
    Crazy Eddie's GUI System (http://www.cegui.org.uk)
    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*************************************************************************/
#ifndef _CEGUIRect_h_
#define _CEGUIRect_h_

#include "CEGUIBase.h"
#include "CEGUIVector.h"
#include "CEGUISize.h"

// Start of CEGUI namespace section
namespace CEGUI
{
/*!
\brief
        Class encapsulating operations on a Rectangle
*/
class CEGUIEXPORT Rect
{
public:
        Rect(void) {}


        /*!
        \brief
                Constructor for a Rect.
        */
        Rect(float left, float top, float right, float bottom);

    Rect(Point pos, Size sz);


        /*!
        \brief
                Return top-left postion of Rect as a Point
        */
        Point   getPosition(void) const         {return Point(d_left, d_top);}

        /*!
        \brief
                return width of Rect area
        */
        float   getWidth(void) const            {return d_right - d_left;}


        /*!
        \brief
                return height of Rect area
        */
        float   getHeight(void) const           {return d_bottom - d_top;}


        /*!
        \brief
                return the size of the Rect area
        */
        Size    getSize(void) const                     {return Size(getWidth(), getHeight());}


        /*!
        \brief
                set the position of the Rect (leaves size in tact)
        */
        void    setPosition(const Point& pt);


        /*!
        \brief
                set the width of the Rect object
        */
        void    setWidth(float width)           {d_right = d_left + width;}

        /*!
        \brief
                set the height of the Rect object
        */
        void    setHeight(float height)         {d_bottom = d_top + height;}


        /*!
        \brief
                set the size of the Rect area
        */
        void    setSize(const Size& sze)        {setWidth(sze.d_width); setHeight(sze.d_height);}


        /*!
        \brief
                return a Rect that is the intersection of 'this' Rect with the Rect 'rect'

        \note
                It can be assumed that if d_left == d_right, or d_top == d_bottom, or getWidth() == 0, or getHeight() == 0, then
                'this' rect was totally outside 'rect'.
        */
        Rect    getIntersection(const Rect& rect) const;


        /*!
        \brief
                Applies an offset the Rect object

        \param pt
                Point object containing the offsets to be applied to the Rect.

        \return
                this Rect after the offset is performed
        */
        Rect&   offset(const Point& pt);


        /*!
        \brief
                Return true if the given Point falls within this Rect

        \param pt
                Point object describing the position to test.

        \return
                true if position \a pt is within this Rect's area, else false
        */
        bool    isPointInRect(const Point& pt) const;


        /*!
        \brief
                check the size of the Rect object and if it is bigger than \a sz, resize it so it isn't.

        \param sz
                Size object that describes the maximum dimensions that this Rect should be limited to.

        \return
                'this' Rect object after the constrain operation
        */
        Rect&   constrainSizeMax(const Size& sz);


        /*!
        \brief
                check the size of the Rect object and if it is smaller than \a sz, resize it so it isn't.

        \param sz
                Size object that describes the minimum dimensions that this Rect should be limited to.

        \return
                'this' Rect object after the constrain operation
        */
        Rect&   constrainSizeMin(const Size& sz);


        /*!
        \brief
                check the size of the Rect object and if it is bigger than \a max_sz or smaller than \a min_sz, resize it so it isn't.

        \param max_sz
                Size object that describes the maximum dimensions that this Rect should be limited to.

        \param min_sz
                Size object that describes the minimum dimensions that this Rect should be limited to.

        \return
                'this' Rect object after the constrain operation
        */
        Rect&   constrainSize(const Size& max_sz, const Size& min_sz);


        /*************************************************************************
                Operators
        *************************************************************************/
        bool    operator==(const Rect& rhs) const
        {
                return ((d_left == rhs.d_left) && (d_right == rhs.d_right) && (d_top == rhs.d_top) && (d_bottom == rhs.d_bottom));
        }

        bool    operator!=(const Rect& rhs) const               {return !operator==(rhs);}

        Rect&   operator=(const Rect& rhs);

    Rect operator*(float scalar) const      { return Rect(d_left * scalar, d_top * scalar, d_right * scalar, d_bottom * scalar); }
    const Rect& operator*=(float scalar)    { d_left *= scalar; d_top *= scalar; d_right *= scalar; d_bottom *= scalar; return *this; }


        /*************************************************************************
                Data Fields
        *************************************************************************/
        float   d_top, d_bottom, d_left, d_right;
};

} // End of  CEGUI namespace section


#endif  // end of guard _CEGUIRect_h_