/****************************************************************************
** $Id: fsize.cpp 13161 2009-02-07 00:36:14Z malex $
**
** Implementation of FSize class
**
** Created : 931028
**
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** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
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**********************************************************************/

#include "fsize.h"
//#include "qdatastream.h"


/*!
  \class FSize
  \brief The FSize class defines the size of a two-dimensional object.

  \ingroup images
  \ingroup graphics

  A size is specified by a width and a height.

  The coordinate type is qreal (defined in \c <qwindowdefs.h> as \c qreal).
  The minimum value of qreal is qreal_MIN (-2147483648) and the maximum
  value is qreal_MAX (2147483647).

  The size can be set in the constructor and changed with setWidth()
  and setHeight(), or using operator+=(), operator-=(), operator*=()
  and operator/=(), etc. You can swap the width and height with
  transpose(). You can get a size which holds the maximum height and
  width of two sizes using expandedTo(), and the minimum height and
  width of two sizes using boundedTo().


  \sa QPoint, QRect
*/


/*****************************************************************************
  FSize member functions
 *****************************************************************************/

/*!
  \fn FSize::FSize()
  Constructs a size with invalid (negative) width and height.
*/

/*!
  \fn FSize::FSize( qreal w, qreal h )
  Constructs a size with width \a w and height \a h.
*/

/*!
  \fn bool FSize::isNull() const
  Returns TRUE if the width is 0 and the height is 0; otherwise
  returns FALSE.
*/

/*!
  \fn bool FSize::isEmpty() const
  Returns TRUE if the width is less than or equal to 0, or the height is
  less than or equal to 0; otherwise returns FALSE.
*/

/*!
  \fn bool FSize::isValid() const
  Returns TRUE if the width is equal to or greater than 0 and the height is
  equal to or greater than 0; otherwise returns FALSE.
*/

/*!
  \fn qreal FSize::width() const
  Returns the width.
  \sa height()
*/

/*!
  \fn qreal FSize::height() const
  Returns the height.
  \sa width()
*/

/*!
  \fn void FSize::setWidth( qreal w )
  Sets the width to \a w.
  \sa width(), setHeight()
*/

/*!
  \fn void FSize::setHeight( qreal h )
  Sets the height to \a h.
  \sa height(), setWidth()
*/

/*!
  Swaps the values of width and height.
*/

void FSize::transpose()
{
    qreal tmp = wd;
    wd = ht;
    ht = tmp;
}

/*! \enum FSize::ScaleMode

    This enum type defines the different ways of scaling a size.

    \img scaling.png

    \value ScaleFree  The size is scaled freely. The ratio is not preserved.
    \value ScaleMin  The size is scaled to a rectangle as large as possible
                     inside a given rectangle, preserving the aspect ratio.
    \value ScaleMax  The size is scaled to a rectangle as small as possible
                     outside a given rectangle, preserving the aspect ratio.

    \sa FSize::scale(), QImage::scale(), QImage::smoothScale()
*/

/*!
    Scales the size to a rectangle of width \a w and height \a h according
    to the ScaleMode \a mode.

    \list
    \i If \a mode is \c ScaleFree, the size is set to (\a w, \a h).
    \i If \a mode is \c ScaleMin, the current size is scaled to a rectangle
       as large as possible inside (\a w, \a h), preserving the aspect ratio.
    \i If \a mode is \c ScaleMax, the current size is scaled to a rectangle
       as small as possible outside (\a w, \a h), preserving the aspect ratio.
    \endlist

    Example:
    \code
    FSize t1( 10, 12 );
    t1.scale( 60, 60, FSize::ScaleFree );
    // t1 is (60, 60)

    FSize t2( 10, 12 );
    t2.scale( 60, 60, FSize::ScaleMin );
    // t2 is (50, 60)

    FSize t3( 10, 12 );
    t3.scale( 60, 60, FSize::ScaleMax );
    // t3 is (60, 72)
    \endcode
*/
void FSize::scale( qreal w, qreal h, Qt::AspectRatioMode mode )
{
    if ( mode == Qt::IgnoreAspectRatio ) {
	wd = (qreal)w;
	ht = (qreal)h;
    } else {
	bool useHeight = TRUE;
	qreal w0 = width();
	qreal h0 = height();
	qreal rw = h * w0 / h0;

	if ( mode == Qt::KeepAspectRatio ) {
	    useHeight = ( rw <= w );
	} else { // mode == ScaleMax
	    useHeight = ( rw >= w );
	}

	if ( useHeight ) {
	    wd = (qreal)rw;
	    ht = (qreal)h;
	} else {
	    wd = (qreal)w;
	    ht = (qreal)( w * h0 / w0 );
	}
    }
}

/*!
    \overload

    Equivalent to scale(\a{s}.width(), \a{s}.height(), \a mode).
*/
void FSize::scale( const FSize &s, Qt::AspectRatioMode mode )
{
    scale( s.width(), s.height(), mode );
}

/*!
  \fn qreal &FSize::rwidth()
  Returns a reference to the width.

  Using a reference makes it possible to directly manipulate the width.

  Example:
  \code
    FSize s( 100, 10 );
    s.rwidth() += 20;		// s becomes (120,10)
  \endcode

  \sa rheight()
*/

/*!
  \fn qreal &FSize::rheight()
  Returns a reference to the height.

  Using a reference makes it possible to directly manipulate the height.

  Example:
  \code
    FSize s( 100, 10 );
    s.rheight() += 5;		// s becomes (100,15)
  \endcode

  \sa rwidth()
*/

/*!
  \fn FSize &FSize::operator+=( const FSize &s )

  Adds \a s to the size and returns a reference to this size.

  Example:
  \code
    FSize s(  3, 7 );
    FSize r( -1, 4 );
    s += r;			// s becomes (2,11)
\endcode
*/

/*!
  \fn FSize &FSize::operator-=( const FSize &s )

  Subtracts \a s from the size and returns a reference to this size.

  Example:
  \code
    FSize s(  3, 7 );
    FSize r( -1, 4 );
    s -= r;			// s becomes (4,3)
  \endcode
*/

/*!
  \fn FSize &FSize::operator*=( qreal c )
  Multiplies both the width and height by \a c and returns a reference to
  the size.
*/

/*!
  \overload FSize &FSize::operator*=( qreal c )

  Multiplies both the width and height by \a c and returns a reference to
  the size.

  Note that the result is truncated.
*/

/*!
  \fn bool operator==( const FSize &s1, const FSize &s2 )
  \relates FSize
  Returns TRUE if \a s1 and \a s2 are equal; otherwise returns FALSE.
*/

/*!
  \fn bool operator!=( const FSize &s1, const FSize &s2 )
  \relates FSize
  Returns TRUE if \a s1 and \a s2 are different; otherwise returns FALSE.
*/

/*!
  \fn const FSize operator+( const FSize &s1, const FSize &s2 )
  \relates FSize
  Returns the sum of \a s1 and \a s2; each component is added separately.
*/

/*!
  \fn const FSize operator-( const FSize &s1, const FSize &s2 )
  \relates FSize
  Returns \a s2 subtracted from \a s1; each component is
  subtracted separately.
*/

/*!
  \fn const FSize operator*( const FSize &s, qreal c )
  \relates FSize
  Multiplies \a s by \a c and returns the result.
*/

/*!
  \overload const FSize operator*( qreal c, const FSize &s )
  \relates FSize
  Multiplies \a s by \a c and returns the result.
*/

/*!
  \overload const FSize operator*( const FSize &s, qreal c )
  \relates FSize
  Multiplies \a s by \a c and returns the result.
*/

/*!
  \overload const FSize operator*( qreal c, const FSize &s )
  \relates FSize
  Multiplies \a s by \a c and returns the result.
*/

/*!
  \fn FSize &FSize::operator/=( qreal c )
  Divides both the width and height by \a c and returns a reference to the
  size.
*/

/*!
  \fn FSize &FSize::operator/=( qreal c )
  \overload
  Divides both the width and height by \a c and returns a reference to the
  size.

  Note that the result is truncated.
*/

/*!
  \fn const FSize operator/( const FSize &s, qreal c )
  \relates FSize
  Divides \a s by \a c and returns the result.
*/

/*!
  \fn const FSize operator/( const FSize &s, qreal c )
  \relates FSize
  \overload
  Divides \a s by \a c and returns the result.

  Note that the result is truncated.
*/

/*!
  \fn FSize FSize::expandedTo( const FSize & otherSize ) const

  Returns a size with the maximum width and height of this size and
  \a otherSize.
*/

/*!
  \fn FSize FSize::boundedTo( const FSize & otherSize ) const

  Returns a size with the minimum width and height of this size and
  \a otherSize.
*/


void FSize::warningDivByZero()
{
#if defined(QT_CHECK_MATH)
    qWarning( "FSize: Division by zero error" );
#endif
}


/*****************************************************************************
  FSize stream functions
 *****************************************************************************/
// #ifndef QT_NO_DATASTREAM
// /*!
//   \relates FSize
//   Writes the size \a sz to the stream \a s and returns a reference to
//   the stream.
//
//   \sa \link datastreamformat.html Format of the QDataStream operators \endlink
// */
//
// QDataStream &operator<<( QDataStream &s, const FSize &sz )
// {
//     if ( s.version() == 1 )
// 	s << (Q_INT16)sz.width() << (Q_INT16)sz.height();
//     else
// 	s << (Q_INT32)sz.width() << (Q_INT32)sz.height();
//     return s;
// }
//
// /*!
//   \relates FSize
//   Reads the size from the stream \a s into size \a sz and returns a
//   reference to the stream.
//
//   \sa \link datastreamformat.html Format of the QDataStream operators \endlink
// */
//
// QDataStream &operator>>( QDataStream &s, FSize &sz )
// {
//     if ( s.version() == 1 ) {
// 	Q_INT16 w, h;
// 	s >> w;  sz.rwidth() = w;
// 	s >> h;  sz.rheight() = h;
//     }
//     else {
// 	Q_INT32 w, h;
// 	s >> w;  sz.rwidth() = w;
// 	s >> h;  sz.rheight() = h;
//     }
//     return s;
// }
// #endif // QT_NO_DATASTREAM
