QSize(3qt)QSize(3qt)NAMEQSize - Defines the size of a two-dimensional object
SYNOPSIS
#include <qsize.h>
Public Members
enum ScaleMode { ScaleFree, ScaleMin, ScaleMax }
QSize ()
QSize ( int w, int h )
bool isNull () const
bool isEmpty () const
bool isValid () const
int width () const
int height () const
void setWidth ( int w )
void setHeight ( int h )
void transpose ()
void scale ( int w, int h, ScaleMode mode )
void scale ( const QSize & s, ScaleMode mode )
QSize expandedTo ( const QSize & otherSize ) const
QSize boundedTo ( const QSize & otherSize ) const
QCOORD & rwidth ()
QCOORD & rheight ()
QSize & operator+= ( const QSize & s )
QSize & operator-= ( const QSize & s )
QSize & operator*= ( int c )
QSize & operator*= ( double c )
QSize & operator/= ( int c )
QSize & operator/= ( double c )
RELATED FUNCTION DOCUMENTATION
bool operator== ( const QSize & s1, const QSize & s2 )
bool operator!= ( const QSize & s1, const QSize & s2 )
const QSize operator+ ( const QSize & s1, const QSize & s2 )
const QSize operator- ( const QSize & s1, const QSize & s2 )
const QSize operator* ( const QSize & s, int c )
const QSize operator* ( int c, const QSize & s )
const QSize operator* ( const QSize & s, double c )
const QSize operator* ( double c, const QSize & s )
const QSize operator/ ( const QSize & s, int c )
const QSize operator/ ( const QSize & s, double c )
QDataStream & operator<< ( QDataStream & s, const QSize & sz )
QDataStream & operator>> ( QDataStream & s, QSize & sz )
DESCRIPTION
The QSize class defines the size of a two-dimensional object.
A size is specified by a width and a height.
The coordinate type is QCOORD (defined in <qwindowdefs.h> as int). The
minimum value of QCOORD is QCOORD_MIN (-2147483648) and the maximum
value is QCOORD_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().
See also QPoint, QRect, Graphics Classes, and Image Processing Classes.
Member Type Documentation
QSize::ScaleMode
This enum type defines the different ways of scaling a size.
<center>
[Image Omitted]
</center>
QSize::ScaleFree - The size is scaled freely. The ratio is not
preserved.
QSize::ScaleMin - The size is scaled to a rectangle as large as
possible inside a given rectangle, preserving the aspect ratio.
QSize::ScaleMax - The size is scaled to a rectangle as small as
possible outside a given rectangle, preserving the aspect ratio.
See also QSize::scale(), QImage::scale(), and QImage::smoothScale().
MEMBER FUNCTION DOCUMENTATIONQSize::QSize ()
Constructs a size with invalid (negative) width and height.
QSize::QSize ( int w, int h )
Constructs a size with width w and height h.
QSize QSize::boundedTo ( const QSize & otherSize ) const
Returns a size with the minimum width and height of this size and
otherSize.
QSize QSize::expandedTo ( const QSize & otherSize ) const
Returns a size with the maximum width and height of this size and
otherSize.
Examples:
int QSize::height () const
Returns the height.
See also width().
Examples:
bool QSize::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.
bool QSize::isNull () const
Returns TRUE if the width is 0 and the height is 0; otherwise returns
FALSE.
bool QSize::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.
QSize & QSize::operator*= ( int c )
Multiplies both the width and height by c and returns a reference to
the size.
QSize & QSize::operator*= ( double c )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Multiplies both the width and height by c and returns a reference to
the size.
Note that the result is truncated.
QSize & QSize::operator+= ( const QSize & s )
Adds s to the size and returns a reference to this size.
Example:
QSize s( 3, 7 );
QSize r( -1, 4 );
s += r; // s becomes (2,11)
QSize & QSize::operator-= ( const QSize & s )
Subtracts s from the size and returns a reference to this size.
Example:
QSize s( 3, 7 );
QSize r( -1, 4 );
s -= r; // s becomes (4,3)
QSize & QSize::operator/= ( int c )
Divides both the width and height by c and returns a reference to the
size.
QSize & QSize::operator/= ( double c )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Divides both the width and height by c and returns a reference to the
size.
Note that the result is truncated.
QCOORD & QSize::rheight ()
Returns a reference to the height.
Using a reference makes it possible to directly manipulate the height.
Example:
QSize s( 100, 10 );
s.rheight() += 5; // s becomes (100,15)
See also rwidth().
QCOORD & QSize::rwidth ()
Returns a reference to the width.
Using a reference makes it possible to directly manipulate the width.
Example:
QSize s( 100, 10 );
s.rwidth() += 20; // s becomes (120,10)
See also rheight().
void QSize::scale ( int w, int h, ScaleMode mode )
Scales the size to a rectangle of width w and height h according to the
ScaleMode mode.
If mode is ScaleFree, the size is set to (w, h).
If mode is ScaleMin, the current size is scaled to a rectangle as large
as possible inside (w, h), preserving the aspect ratio.
If mode is ScaleMax, the current size is scaled to a rectangle as small
as possible outside (w, h), preserving the aspect ratio.
Example:
QSize t1( 10, 12 );
t1.scale( 60, 60, QSize::ScaleFree );
// t1 is (60, 60)
QSize t2( 10, 12 );
t2.scale( 60, 60, QSize::ScaleMin );
// t2 is (50, 60)
QSize t3( 10, 12 );
t3.scale( 60, 60, QSize::ScaleMax );
// t3 is (60, 72)
void QSize::scale ( const QSize & s, ScaleMode mode )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Equivalent to scale(s.width(), s.height(), mode).
void QSize::setHeight ( int h )
Sets the height to h.
See also height() and setWidth().
void QSize::setWidth ( int w )
Sets the width to w.
See also width() and setHeight().
void QSize::transpose ()
Swaps the values of width and height.
int QSize::width () const
Returns the width.
See also height().
Examples:
RELATED FUNCTION DOCUMENTATIONbool operator!= ( const QSize & s1, const QSize & s2 )
Returns TRUE if s1 and s2 are different; otherwise returns FALSE.
const QSize operator* ( const QSize & s, int c )
Multiplies s by c and returns the result.
const QSize operator* ( int c, const QSize & s )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Multiplies s by c and returns the result.
const QSize operator* ( const QSize & s, double c )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Multiplies s by c and returns the result.
const QSize operator* ( double c, const QSize & s )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Multiplies s by c and returns the result.
const QSize operator+ ( const QSize & s1, const QSize & s2 )
Returns the sum of s1 and s2; each component is added separately.
const QSize operator- ( const QSize & s1, const QSize & s2 )
Returns s2 subtracted from s1; each component is subtracted separately.
const QSize operator/ ( const QSize & s, int c )
Divides s by c and returns the result.
const QSize operator/ ( const QSize & s, double c )
This is an overloaded member function, provided for convenience. It
behaves essentially like the above function.
Divides s by c and returns the result.
Note that the result is truncated.
QDataStream & operator<;< ( QDataStream & s, const QSize & sz )
Writes the size sz to the stream s and returns a reference to the
stream.
See also Format of the QDataStream operators.
bool operator== ( const QSize & s1, const QSize & s2 )
Returns TRUE if s1 and s2 are equal; otherwise returns FALSE.
QDataStream & operator>> ( QDataStream & s, QSize & sz )
Reads the size from the stream s into size sz and returns a reference
to the stream.
See also Format of the QDataStream operators.
SEE ALSO
http://doc.trolltech.com/qsize.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports help us to
help you. Thank you.
The definitive Qt documentation is provided in HTML format; it is
located at $QTDIR/doc/html and can be read using Qt Assistant or with a
web browser. This man page is provided as a convenience for those users
who prefer man pages, although this format is not officially supported
by Trolltech.
If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(qsize.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QSize(3qt)
