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# QRegion Class Reference

The QRegion class specifies a clip region for a painter. More...

`#include <qregion.h>`

List of all member functions.

## 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 Functions

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

## Detailed 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.

Due to window system limitations, the width and height of a region is limited to 65535 on Unix/X11.

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

## Member Type Documentation

### QRegion::RegionType

Determines 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 r.

### QRegion::QRegion ( const QBitmap & bm )

Constructs a region from the bitmap bm.

The resulting region consists of the pixels in 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, or FALSE if p is outside the region.

### 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; or FALSE if r is completely outside the region.

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

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

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.

The figure shows the intersection of two elliptical regions.

### bool QRegion::isEmpty () const

Returns TRUE if the region is empty, or FALSE if it is non-empty. 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 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, or FALSE if the regions are equal.

### 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, or FALSE if the regions are different.

### 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.

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.

The figure shows the union of two elliptical regions.

## Related Functions

### 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.

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