QRegion

Section: Misc. Reference Manual Pages (3qt)
Updated: 2 February 2007
Index Return to Main Contents
 

NAME

QRegion - Clip region for a painter  

SYNOPSIS

#include <qregion.h>

 

Public Members


enum RegionType { Rectangle, Ellipse }

QRegion ()

QRegion ( int x, int y, int w, int h, RegionType t = Rectangle )

QRegion ( const QRect & r, RegionType t = Rectangle )

QRegion ( const QPointArray & a, bool winding = FALSE )

QRegion ( const QRegion & r )

QRegion ( const QBitmap & bm )

~QRegion ()

QRegion & operator= ( const QRegion & r )

bool isNull () const

bool isEmpty () const

bool contains ( const QPoint & p ) const

bool contains ( const QRect & r ) const

void translate ( int dx, int dy )

QRegion unite ( const QRegion & r ) const

QRegion intersect ( const QRegion & r ) const

QRegion subtract ( const QRegion & r ) const

QRegion eor ( const QRegion & r ) const

QRect boundingRect () const

QMemArray<QRect> rects () const

const QRegion operator| ( const QRegion & r ) const

const QRegion operator+ ( const QRegion & r ) const

const QRegion operator& ( const QRegion & r ) const

const QRegion operator- ( const QRegion & r ) const

const QRegion operator^ ( const QRegion & r ) const

QRegion & operator|= ( const QRegion & r )

QRegion & operator+= ( const QRegion & r )

QRegion & operator&= ( const QRegion & r )

QRegion & operator-= ( const QRegion & r )

QRegion & operator^= ( const QRegion & r )

bool operator== ( const QRegion & r ) const

bool operator!= ( const QRegion & r ) const

HRGN handle () const
 

RELATED FUNCTION DOCUMENTATION


QDataStream & operator<< ( QDataStream & s, const QRegion & r )

QDataStream & operator>> ( QDataStream & s, QRegion & r )
 

DESCRIPTION

The QRegion class specifies a clip region for a painter.

QRegion is used with QPainter::setClipRegion() to limit the paint area to what needs to be painted. There is also a QWidget::repaint() that takes a QRegion parameter. QRegion is the best tool for reducing flicker.

A region can be created from a rectangle, an ellipse, a polygon or a bitmap. Complex regions may be created by combining simple regions using unite(), intersect(), subtract() or eor() (exclusive or). You can move a region using translate().

You can test whether a region isNull(), isEmpty() or if it contains() a QPoint or QRect. The bounding rectangle is given by boundingRect().

The function rects() gives a decomposition of the region into rectangles.

Example of using complex regions: 



        void MyWidget::paintEvent( QPaintEvent * )


        {


            QPainter p;                         // our painter


            QRegion r1( QRect(100,100,200,80),  // r1 = elliptic region


                        QRegion::Ellipse );


            QRegion r2( QRect(100,120,90,30) ); // r2 = rectangular region


            QRegion r3 = r1.intersect( r2 );    // r3 = intersection


            p.begin( this );                    // start painting widget


            p.setClipRegion( r3 );              // set clip region


            ...                                 // paint clipped graphics


            p.end();                            // painting done


        }

QRegion is an implicitly shared class.

Warning: Due to window system limitations, the whole coordinate space for a region is limited to the points between -32767 and 32767 on Mac OS X and Windows 95/98/ME.

See also QPainter::setClipRegion(), QPainter::setClipRect(), Graphics Classes, and Image Processing Classes.  

Member Type Documentation

 

QRegion::RegionType

Specifies the shape of the region to be created.
QRegion::Rectangle - the region covers the entire rectangle.
QRegion::Ellipse - the region is an ellipse inside the rectangle.
 

MEMBER FUNCTION DOCUMENTATION

 

QRegion::QRegion ()

Constructs a null region.

See also isNull().  

QRegion::QRegion ( int x, int y, int w, int h, RegionType t = Rectangle )

Constructs a rectangular or elliptic region.

If t is Rectangle, the region is the filled rectangle (x, y, w, h). If t is Ellipse, the region is the filled ellipse with center at (x + w / 2, y + h / 2) and size (w ,h ).  

QRegion::QRegion ( const QRect & r, RegionType t = Rectangle )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Create a region based on the rectange r with region type t.

If the rectangle is invalid a null region will be created.

See also QRegion::RegionType.  

QRegion::QRegion ( const QPointArray & a, bool winding = FALSE )

Constructs a polygon region from the point array a.

If winding is TRUE, the polygon region is filled using the winding algorithm, otherwise the default even-odd fill algorithm is used.

This constructor may create complex regions that will slow down painting when used.  

QRegion::QRegion ( const QRegion & r )

Constructs a new region which is equal to region r.  

QRegion::QRegion ( const QBitmap & bm )

Constructs a region from the bitmap bm.

The resulting region consists of the pixels in bitmap bm that are color1, as if each pixel was a 1 by 1 rectangle.

This constructor may create complex regions that will slow down painting when used. Note that drawing masked pixmaps can be done much faster using QPixmap::setMask().  

QRegion::~QRegion ()

Destroys the region.  

QRect QRegion::boundingRect () const

Returns the bounding rectangle of this region. An empty region gives a rectangle that is QRect::isNull().  

bool QRegion::contains ( const QPoint & p ) const

Returns TRUE if the region contains the point p; otherwise returns FALSE.  

bool QRegion::contains ( const QRect & r ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns TRUE if the region overlaps the rectangle r; otherwise returns FALSE.  

QRegion QRegion::eor ( const QRegion & r ) const

Returns a region which is the exclusive or (XOR) of this region and r.

<center>

[Image Omitted]

</center>

The figure shows the exclusive or of two elliptical regions.  

HRGN QRegion::handle () const

Returns the region's handle.  

QRegion QRegion::intersect ( const QRegion & r ) const

Returns a region which is the intersection of this region and r.

<center>

[Image Omitted]

</center>

The figure shows the intersection of two elliptical regions.  

bool QRegion::isEmpty () const

Returns TRUE if the region is empty; otherwise returns FALSE. An empty region is a region that contains no points.

Example: 



        QRegion r1( 10, 10, 20, 20 );


        QRegion r2( 40, 40, 20, 20 );


        QRegion r3;


        r1.isNull();             // FALSE


        r1.isEmpty();            // FALSE


        r3.isNull();             // TRUE


        r3.isEmpty();            // TRUE


        r3 = r1.intersect( r2 ); // r3 = intersection of r1 and r2


        r3.isNull();             // FALSE


        r3.isEmpty();            // TRUE


        r3 = r1.unite( r2 );     // r3 = union of r1 and r2


        r3.isNull();             // FALSE


        r3.isEmpty();            // FALSE

See also isNull().  

bool QRegion::isNull () const

Returns TRUE if the region is a null region; otherwise returns FALSE.

A null region is a region that has not been initialized. A null region is always empty.

See also isEmpty().  

bool QRegion::operator!= ( const QRegion & r ) const

Returns TRUE if the region is different from r; otherwise returns FALSE.  

const QRegion QRegion::operator& ( const QRegion & r ) const

Applies the intersect() function to this region and r. r1&r2 is equivalent to r1.intersect(r2)

See also intersect().  

QRegion & QRegion::operator&= ( const QRegion & r )

Applies the intersect() function to this region and r and assigns the result to this region. r1&=r2 is equivalent to r1=r1.intersect(r2)

See also intersect().  

const QRegion QRegion::operator+ ( const QRegion & r ) const

Applies the unite() function to this region and r. r1+r2 is equivalent to r1.unite(r2)

See also unite() and operator|().  

QRegion & QRegion::operator+= ( const QRegion & r )

Applies the unite() function to this region and r and assigns the result to this region. r1+=r2 is equivalent to r1=r1.unite(r2)

See also intersect().  

const QRegion QRegion::operator- ( const QRegion & r ) const

Applies the subtract() function to this region and r. r1-r2 is equivalent to r1.subtract(r2)

See also subtract().  

QRegion & QRegion::operator-= ( const QRegion & r )

Applies the subtract() function to this region and r and assigns the result to this region. r1-=r2 is equivalent to r1=r1.subtract(r2)

See also subtract().  

QRegion & QRegion::operator= ( const QRegion & r )

Assigns r to this region and returns a reference to the region.  

bool QRegion::operator== ( const QRegion & r ) const

Returns TRUE if the region is equal to r; otherwise returns FALSE.  

const QRegion QRegion::operator^ ( const QRegion & r ) const

Applies the eor() function to this region and r. r1^r2 is equivalent to r1.eor(r2)

See also eor().  

QRegion & QRegion::operator^= ( const QRegion & r )

Applies the eor() function to this region and r and assigns the result to this region. r1^=r2 is equivalent to r1=r1.eor(r2)

See also eor().  

const QRegion QRegion::operator| ( const QRegion & r ) const

Applies the unite() function to this region and r. r1|r2 is equivalent to r1.unite(r2)

See also unite() and operator+().  

QRegion & QRegion::operator|= ( const QRegion & r )

Applies the unite() function to this region and r and assigns the result to this region. r1|=r2 is equivalent to r1=r1.unite(r2)

See also unite().  

QMemArray<QRect> QRegion::rects () const

Returns an array of non-overlapping rectangles that make up the region.

The union of all the rectangles is equal to the original region.  

QRegion QRegion::subtract ( const QRegion & r ) const

Returns a region which is r subtracted from this region.

<center>

[Image Omitted]

</center>

The figure shows the result when the ellipse on the right is subtracted from the ellipse on the left. (left-right )  

void QRegion::translate ( int dx, int dy )

Translates (moves) the region dx along the X axis and dy along the Y axis.  

QRegion QRegion::unite ( const QRegion & r ) const

Returns a region which is the union of this region and r.

<center>

[Image Omitted]

</center>

The figure shows the union of two elliptical regions.  

RELATED FUNCTION DOCUMENTATION

 

QDataStream & operator<< ( QDataStream & s, const QRegion & r )

Writes the region r to the stream s and returns a reference to the stream.

See also Format of the QDataStream operators.  

QDataStream & operator>> ( QDataStream & s, QRegion & r )

Reads a region from the stream s into r and returns a reference to the stream.

See also Format of the QDataStream operators.

 

SEE ALSO

http://doc.trolltech.com/qregion.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 (qregion.3qt) and the Qt version (3.3.8).