QRegion Class Reference

#include <qregion.h>

Collaboration diagram for QRegion:

Collaboration graph
[legend]
List of all members.

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() function 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 united(), intersected(), subtracted(), or xored() (exclusive or). You can move a region using translate().

You can test whether a region isEmpty() or if it contains() a QPoint or QRect. The bounding rectangle can be found with boundingRect().

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

Example of using complex regions: 

        void MyWidget::paintEvent(QPaintEvent *)
        {
            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.intersected(r2);        // r3: intersection

            QPainter painter(this);
      painter.setClipRegion(r3);
            ...                                     // paint clipped graphics
        }

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 Windows 95/98/ME. You can circumvent this limitation by using a QPainterPath.

For Qt/X11 and Qtopia Core, parts of this class rely on code obtained under the following license: \legalese Copyright (c) 1987 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the X Consortium shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the X Consortium. \endlegalese \raw HTML <hr /> \endraw \legalese Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Digital not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. \endlegalese \sa QPainter::setClipRegion(), QPainter::setClipRect(), QPainterPath Definition at line 44 of file qregion.h.

Public Types

enum  RegionType

Public Member Functions

 QRegion ()
 QRegion (int x, int y, int w, int h, RegionType t=Rectangle)
 QRegion (const QRect &r, RegionType t=Rectangle)
 QRegion (const QPolygon &pa, Qt::FillRule fillRule=Qt::OddEvenFill)
 QRegion (const QRegion &region)
 QRegion (const QBitmap &bitmap)
 ~QRegion ()
QRegion & operator= (const QRegion &)
bool isEmpty () const
bool contains (const QPoint &p) const
bool contains (const QRect &r) const
void translate (int dx, int dy)
void translate (const QPoint &p)
QRegion translated (int dx, int dy) const
QRegion translated (const QPoint &p) const
QRegion unite (const QRegion &r) const
QRegion intersect (const QRegion &r) const
QRegion subtract (const QRegion &r) const
QRegion eor (const QRegion &r) const
QRegion united (const QRegion &r) const
QRegion intersected (const QRegion &r) const
QRegion subtracted (const QRegion &r) const
QRegion xored (const QRegion &r) const
bool intersects (const QRegion &r) const
bool intersects (const QRect &r) const
QRect boundingRect () const
QVector< QRect > rects () const
void setRects (const QRect *rect, int num)
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
 operator QVariant () const

Private Member Functions

QRegion copy () const
void detach ()
void exec (const QByteArray &ba, int ver=0)

Static Private Member Functions

static void cleanUp (QRegionData *x)

Private Attributes

QRegionData * d

Static Private Attributes

static struct QRegionData shared_empty

Friends

Q_GUI_EXPORT QDataStream & operator<< (QDataStream &, const QRegion &)
Q_GUI_EXPORT QDataStream & operator>> (QDataStream &, QRegion &)

Classes

struct  QRegionData

Member Enumeration Documentation

enum QRegion::RegionType

Specifies the shape of the region to be created.

Rectangle the region covers the entire rectangle. Ellipse the region is an ellipse inside the rectangle.

Definition at line 47 of file qregion.h.

00047 { Rectangle, Ellipse };

Constructor & Destructor Documentation

QRegion::QRegion (  ) 

Constructs an empty region.

See also:
isEmpty()

Definition at line 2397 of file qregion_unix.cpp.

Referenced by exec().

02401     : d(&shared_empty)

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).

Definition at line 180 of file qregion.cpp.

References d, QRegion::QRegionData::ref, and QBasicAtomic::ref().

00181 {
00182     QRegion tmp(QRect(x, y, w, h), t);
00183     tmp.d->ref.ref();
00184     d = tmp.d;
00185 }

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

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. 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

Definition at line 2413 of file qregion_unix.cpp.

02417 {
02418     if (r.isEmpty()) {
02419         d = &shared_empty;
02420         d->ref.ref();
02421     } else {
02422         d = new QRegionData;
02423         d->ref.init(1);
02424 #if defined(Q_WS_X11)
02425         d->rgn = 0;
02426         d->xrectangles = 0;
02427 #elif defined(Q_WS_MAC)
02428         d->rgn = 0;
02429 #endif
02430         if (t == Rectangle) {
02431             d->qt_rgn = new QRegionPrivate(r);
02432         } else if (t == Ellipse) {
02433             QPainterPath path;
02434             path.addEllipse(r.x(), r.y(), r.width(), r.height());
02435             QPolygon a = path.toSubpathPolygons().at(0).toPolygon();
02436             d->qt_rgn = PolygonRegion(a.constData(), a.size(), EvenOddRule);

QRegion::QRegion ( const QPolygon &  a,
Qt::FillRule  fillRule = Qt::OddEvenFill 
)

Constructs a polygon region from the point array a with the fill rule specified by fillRule.

If fillRule is {Qt::WindingFill}, the polygon region is defined using the winding algorithm; if it is {Qt::OddEvenFill}, the odd-even fill algorithm is used.

Warning:
This constructor can be used to create complex regions that will slow down painting when used.

Definition at line 2450 of file qregion_unix.cpp.

02454 {
02455     if (a.count() > 2) {
02456         d =  new QRegionData;
02457         d->ref.init(1);
02458 #if defined(Q_WS_X11)
02459         d->rgn = 0;
02460         d->xrectangles = 0;
02461 #elif defined(Q_WS_MAC)
02462         d->rgn = 0;
02463 #endif
02464         d->qt_rgn = PolygonRegion(a.constData(), a.size(),
02465                                   fillRule == Qt::WindingFill ? WindingRule : EvenOddRule);
02466     } else {
02467         d = &shared_empty;

QRegion::QRegion ( const QRegion &  r  ) 

Constructs a new region which is equal to region r.

Definition at line 2474 of file qregion_unix.cpp.

02478 {

QRegion::QRegion ( const QBitmap &  bm  ) 

Constructs a region from the bitmap bm.

The resulting region consists of the pixels in bitmap bm that are Qt::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().

Definition at line 2491 of file qregion_unix.cpp.

02495 {
02496     if (bm.isNull()) {
02497         d = &shared_empty;
02498         d->ref.ref();
02499     } else {
02500         d = new QRegionData;
02501         d->ref.init(1);
02502 #if defined(Q_WS_X11)
02503         d->rgn = 0;
02504         d->xrectangles = 0;
02505 #elif defined(Q_WS_MAC)
02506         d->rgn = 0;
02507 #endif

QRegion::~QRegion (  ) 

Destroys the region.

Definition at line 2528 of file qregion_unix.cpp.

02532 {

Member Function Documentation

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

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

Definition at line 2539 of file qregion_unix.cpp.

02543 {
02544     QRegionData *x = r.d;
02545     x->ref.ref();
02546     x = qAtomicSetPtr(&d, x);
02547     if (!x->ref.deref())

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);
        r1.isNull();                // false
        r1.isEmpty();               // false

        QRegion r2(40, 40, 20, 20);
        QRegion r3;
        r3.isNull();                // true
        r3.isEmpty();               // true

        r3 = r1.intersected(r2);    // r3: intersection of r1 and r2
        r3.isNull();                // false
        r3.isEmpty();               // true

        r3 = r1.united(r2);         // r3: union of r1 and r2
        r3.isNull();                // false
        r3.isEmpty();               // false

Definition at line 2600 of file qregion_unix.cpp.

Referenced by QRasterPaintEngine::begin(), Q3ScrollView::changeFrameRect(), qdesigner_internal::childAt_SkipDropLine(), QWidget::childrenRegion(), QWidgetBackingStore::cleanRegion(), QWidgetBackingStore::copyToScreen(), QWidgetPrivate::create_sys(), QWidgetBackingStore::dirtyRegion(), QWidgetPrivate::dirtyWidget_sys(), QWindowsXPStylePrivate::drawBackgroundDirectly(), QWindowsXPStylePrivate::drawBackgroundThruNativeBuffer(), Q3IconView::drawContents(), Q3CanvasView::drawContents(), QWindowsStyle::drawControl(), QWidgetPrivate::drawWidget(), QRasterPaintEngine::flush(), Q3TableHeader::paintEvent(), QWidgetBackingStore::paintSiblingsRecursive(), Q3ListBox::refreshSlot(), QWidget::repaint(), QWidgetPrivate::scrollRect(), QMenuPrivate::setCurrentAction(), PieView::setSelection(), QWidgetPrivate::subtractOpaqueChildren(), QETWidget::translatePaintEvent(), QWidget::update(), QX11PaintEngine::updateBrush(), QRasterPaintEngine::updateClipRegion(), QPicturePaintEngine::updateClipRegion(), QX11PaintEngine::updateClipRegion_dev(), QWorkspaceChild::updateMask(), QX11PaintEngine::updatePen(), QGraphicsView::updateScene(), Q3ListBox::viewportPaintEvent(), and QApplication::widgetAt().

02604 {

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

Returns true if the region contains the point p; otherwise returns false.

Definition at line 2611 of file qregion_unix.cpp.

Referenced by qdesigner_internal::childAt_SkipDropLine(), qdesigner_internal::TabOrderEditor::mouseMoveEvent(), qdesigner_internal::TabOrderEditor::mousePressEvent(), QDockAreaLayoutInfo::paintSeparators(), and QDockWidgetLayout::paintSeparators().

02615 {

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

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Returns true if the region overlaps the rectangle r; otherwise returns false.

Definition at line 2623 of file qregion_unix.cpp.

02627 {

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

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

Definition at line 2635 of file qregion_unix.cpp.

Referenced by QWidgetBackingStore::cleanRegion(), QWidgetBackingStore::copyToScreen(), QWidgetBackingStore::dirtyRegion(), QWidgetPrivate::drawWidget(), exec(), QWidgetPrivate::moveRect(), QWidget::repaint(), and translated().

02639 {
02640     detach();
02641     OffsetRegion(*d->qt_rgn, dx, dy);
02642 #if defined(Q_WS_X11)
02643     if (d->xrectangles) {
02644         free(d->xrectangles);
02645         d->xrectangles = 0;
02646     }
02647 #elif defined(Q_WS_MAC)
02648     if(d->rgn) {
02649         qt_mac_dispose_rgn(d->rgn);
02650         d->rgn = 0;

void QRegion::translate ( const QPoint &  point  )  [inline]

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Translates the region {point}{.x()} along the x axis and {point}{.y()} along the y axis, relative to the current position. Positive values move the region to the right and down.

Translates to the given point.

Definition at line 70 of file qregion.h.

References p.

00070 { translate(p.x(), p.y()); }

QRegion QRegion::translated ( int  dx,
int  dy 
) const

Since:
4.1
Returns a copy of the region that is translated dx along the x axis and dy along the y axis, relative to the current position. Positive values move the region to the right and down.

See also:
translate()

Definition at line 521 of file qregion.cpp.

References translate().

Referenced by QWidget::childrenRegion(), QWindowsXPStylePrivate::drawBackgroundDirectly(), QWidgetPrivate::moveRect(), QWidgetBackingStore::paintSiblingsRecursive(), QWidgetPrivate::setGeometry_sys(), QWidget::setMask(), and QWidgetPrivate::subtractOpaqueChildren().

00522 {
00523     QRegion ret(*this);
00524     ret.translate(dx, dy);
00525     return ret;
00526 }

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QRegion QRegion::translated ( const QPoint &  p  )  const [inline]

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Since:
4.1
Returns a copy of the regtion that is translated {p}{.x()} along the x axis and {p}{.y()} along the y axis, relative to the current position. Positive values move the rectangle to the right and down.

See also:
translate()

Definition at line 72 of file qregion.h.

References p.

00072 { return translated(p.x(), p.y()); }

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

Use united(r) instead.

Definition at line 2672 of file qregion_unix.cpp.

Referenced by CannonField::moveShot(), and qdesigner_internal::Connection::region().

02676 {
02677     QRegion result;
02678     result.detach();

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

Use intersected(r) instead.

Definition at line 2716 of file qregion_unix.cpp.

Referenced by PieView::setSelection().

02720 {
02721     QRegion result;
02722     if (::isEmpty(d->qt_rgn) || ::isEmpty(r.d->qt_rgn)
02723         || !EXTENTCHECK(&d->qt_rgn->extents, &r.d->qt_rgn->extents))
02724         return result;
02725 
02726 #ifdef QT_EXPERIMENTAL_REGIONS
02727     /* this is fully contained in r */
02728     if (r.d->qt_rgn->contains(*d->qt_rgn))
02729         return *this;
02730 
02731     /* r is fully contained in this */
02732     if (d->qt_rgn->contains(*r.d->qt_rgn))
02733         return r;
02734 #endif
02735 
02736     result.detach();
02737     miRegionOp(*result.d->qt_rgn, d->qt_rgn, r.d->qt_rgn, miIntersectO, 0, 0);
02738 
02739     /*
02740      * Can't alter dest's extents before we call miRegionOp because
02741      * it might be one of the source regions and miRegionOp depends
02742      * on the extents of those regions being the same. Besides, this
02743      * way there's no checking against rectangles that will be nuked
02744      * due to coalescing, so we have to examine fewer rectangles.
02745      */

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

Use subtracted(r) instead.

Definition at line 2768 of file qregion_unix.cpp.

Referenced by Spacer::updateMask().

02772 {
02773     QRegion result;
02774     result.detach();

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

Use xored(r) instead.

Definition at line 2797 of file qregion_unix.cpp.

02801 {
02802     QRegion result;
02803     result.detach();

QRegion QRegion::united ( const QRegion &  r  )  const [inline]

Since:
4.2
Returns a region which is the union of this region and r.

runion.png Region Union

The figure shows the union of two elliptical regions.

See also:
intersected(), subtracted(), xored()

Definition at line 80 of file qregion.h.

Referenced by Q3ScrollView::changeFrameRect(), exec(), operator+(), operator|(), and Q3ListBox::refreshSlot().

00080 { return unite(r); }

QRegion QRegion::intersected ( const QRegion &  r  )  const [inline]

Since:
4.2
Returns a region which is the intersection of this region and r.

rintersect.png Region Intersection

The figure shows the intersection of two elliptical regions.

Definition at line 81 of file qregion.h.

Referenced by Q3IconView::drawContents(), QWindowsStyle::drawControl(), exec(), operator &(), QX11PaintEngine::updateClipRegion_dev(), and Q3ListBox::viewportPaintEvent().

00081 { return intersect(r); }

QRegion QRegion::subtracted ( const QRegion &  r  )  const [inline]

Since:
4.2
Returns a region which is r subtracted from this region.

rsubtract.png Region Subtraction

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

See also:
intersected(), united(), xored()

Definition at line 82 of file qregion.h.

Referenced by Q3ScrollView::changeFrameRect(), Q3IconView::doAutoScroll(), Q3IconView::drawContents(), exec(), Q3IconView::insertInGrid(), operator-(), Q3GridView::paintEmptyArea(), Q3Table::paintEmptyArea(), Q3Table::repaintSelections(), and Q3ListBox::viewportPaintEvent().

00082 { return subtract(r); }

QRegion QRegion::xored ( const QRegion &  r  )  const [inline]

Since:
4.2
Returns a region which is the exclusive or (XOR) of this region and r.

rxor.png Region XORed

The figure shows the exclusive or of two elliptical regions.

See also:
intersected(), united(), subtracted()

Definition at line 83 of file qregion.h.

Referenced by exec(), and operator^().

00083 { return eor(r); }

bool QRegion::intersects ( const QRegion &  region  )  const

Since:
4.2
Returns true if this region intersects with region, otherwise returns false.

Definition at line 541 of file qregion.cpp.

References QVector< T >::begin(), QVector< T >::end(), rect_intersects(), and rects().

00542 {
00543     const QVector<QRect> myRects = rects();
00544     const QVector<QRect> otherRects = region.rects();
00545 
00546     for (QVector<QRect>::const_iterator i1 = myRects.begin(); i1 < myRects.end(); ++i1)
00547         for (QVector<QRect>::const_iterator i2 = otherRects.begin(); i2 < otherRects.end(); ++i2)
00548             if (rect_intersects(*i1, *i2))
00549                 return true;
00550     return false;
00551 }

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bool QRegion::intersects ( const QRect &  rect  )  const

Since:
4.2
Returns true if this region intersects with rect, otherwise returns false.

Definition at line 559 of file qregion.cpp.

References QVector< T >::begin(), QVector< T >::end(), QRect::normalized(), rect_intersects(), and rects().

00560 {
00561     QRect r = rect.normalized();
00562     const QVector<QRect> myRects = rects();
00563     for (QVector<QRect>::const_iterator it = myRects.begin(); it < myRects.end(); ++it)
00564         if (rect_intersects(r, *it))
00565             return true;
00566     return false;
00567 }

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QRect QRegion::boundingRect (  )  const

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

Definition at line 2810 of file qregion_unix.cpp.

Referenced by QWidgetBackingStore::copyToScreen(), Q3SimpleRichText::draw(), QWindowsXPStylePrivate::drawBackgroundDirectly(), Q3IconView::drawContents(), QTreeView::drawTree(), QWidgetPrivate::drawWidget(), Skin::endPress(), QX11WindowSurface::flush(), QRasterWindowSurface::flush(), operator<<(), Skin::paintEvent(), QWidgetBackingStore::paintSiblingsRecursive(), qdesigner_internal::Connection::region(), QPainter::setClipRegion(), Skin::startPress(), QPicturePaintEngine::updateClipRegion(), and QPicturePaintEngine::writeCmdLength().

02814 {
02815     if (isEmpty())

QVector< 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.

Definition at line 2865 of file qregion_unix.cpp.

Referenced by QPainterPath::addRegion(), QWindowsXPStylePrivate::drawBackgroundThruNativeBuffer(), Q3CanvasView::drawContents(), QTreeView::drawTree(), QRasterPaintEngine::flush(), Q3IconView::insertInGrid(), intersects(), operator<<(), Q3GridView::paintEmptyArea(), Q3Table::paintEmptyArea(), QGraphicsView::paintEvent(), Q3Table::repaintSelections(), QPainter::setClipRegion(), QPdfBaseEngine::updateState(), and Q3ListBox::viewportPaintEvent().

02869 {
02870     if (d->qt_rgn) {
02871         d->qt_rgn->rects.resize(d->qt_rgn->numRects);
02872         return d->qt_rgn->rects;
02873     } else {

void QRegion::setRects ( const QRect *  rects,
int  number 
)

Sets the region using the array of rectangles specified by rects and number. The rectangles must be optimally Y-X sorted and follow these restrictions:

The rectangles must not intersect. All rectangles with a given top coordinate must have the same height. No two rectangles may abut horizontally (they should be combined into a single wider rectangle in that case). The rectangles must be sorted in ascending order, with Y as the major sort key and X as the minor sort key. Only some platforms have that restriction (QWS and X11 and Mac OS X).

Definition at line 2894 of file qregion_unix.cpp.

02898 {
02899     *this = QRegion();
02900     detach();
02901     if (!rects || (num == 1 && rects->isEmpty()))
02902         num = 0;
02903 
02904     d->qt_rgn->rects.resize(num);
02905     d->qt_rgn->numRects = num;
02906     if (num == 0) {
02907         d->qt_rgn->extents = QRect();
02908     } else {
02909         int left = INT_MAX,
02910             right = INT_MIN,
02911             top = INT_MAX,
02912             bottom = INT_MIN;
02913         for (int i = 0; i < num; ++i) {
02914             const QRect &rect = rects[i];
02915             d->qt_rgn->rects[i] = rect;
02916             left = qMin(rect.left(), left);
02917             right = qMax(rect.right(), right);
02918             top = qMin(rect.top(), top);
02919             bottom = qMax(rect.bottom(), bottom);
02920 #ifdef QT_EXPERIMENTAL_REGIONS
02921             d->qt_rgn->updateInnerRect(rect);
02922 #endif
02923         }

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

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

See also:
united(), operator+()

Definition at line 383 of file qregion.cpp.

References united().

00384     { return united(r); }

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

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

See also:
united(), operator|()

Definition at line 392 of file qregion.cpp.

References united().

00393     { return united(r); }

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

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

See also:
intersected()

Definition at line 401 of file qregion.cpp.

References intersected().

00402     { return intersected(r); }

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

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

See also:
subtracted()

Definition at line 410 of file qregion.cpp.

References subtracted().

00411     { return subtracted(r); }

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

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

See also:
xored()

Definition at line 419 of file qregion.cpp.

References xored().

00420     { return xored(r); }

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

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

See also:
united()

Definition at line 429 of file qregion.cpp.

00430     { return *this = *this | r; }

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

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

See also:
intersected()

Definition at line 440 of file qregion.cpp.

00441     { return *this = *this + r; }

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

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

See also:
intersected()

Definition at line 451 of file qregion.cpp.

00452     { return *this = *this & r; }

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

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

See also:
subtracted()

Definition at line 461 of file qregion.cpp.

00462     { return *this = *this - r; }

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

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

See also:
xored()

Definition at line 471 of file qregion.cpp.

00472     { return *this = *this ^ r; }

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

Returns true if the region is equal to r; otherwise returns false.

Definition at line 2930 of file qregion_unix.cpp.

02934 {
02935     if (!d->qt_rgn || !r.d->qt_rgn)
02936         return r.d->qt_rgn == d->qt_rgn;
02937 
02938     if (d == r.d)
02939         return true;

bool QRegion::operator!= ( const QRegion &  other  )  const [inline]

Returns true if this region is different from the other region; otherwise returns false.

Definition at line 104 of file qregion.h.

References operator==().

00104 { return !(operator==(r)); }

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QRegion::operator QVariant (  )  const

Returns the region as a QVariant

Definition at line 484 of file qregion.cpp.

References QVariant::Region.

00485 {
00486     return QVariant(QVariant::Region, this);
00487 }

QRegion QRegion::copy (  )  const [private]

Definition at line 2554 of file qregion_unix.cpp.

Referenced by detach(), and exec().

02558 {
02559     QRegion r;
02560     QRegionData *x = new QRegionData;
02561     x->ref.init(1);
02562 #if defined(Q_WS_X11)
02563     x->rgn = 0;
02564     x->xrectangles = 0;
02565 #elif defined(Q_WS_MAC)
02566     x->rgn = 0;
02567 #endif
02568     if (d->qt_rgn)
02569         x->qt_rgn = new QRegionPrivate(*d->qt_rgn);
02570     else
02571         x->qt_rgn = new QRegionPrivate;
02572     x = qAtomicSetPtr(&r.d, x);
02573     if (!x->ref.deref())

void QRegion::detach (  )  [private]

Definition at line 202 of file qregion.cpp.

References copy(), d, and QRegion::QRegionData::ref.

00203 {
00204     if (d->ref != 1)
00205         *this = copy();
00206 }

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void QRegion::exec ( const QByteArray &  ba,
int  ver = 0 
) [private]

Definition at line 232 of file qregion.cpp.

References a, buffer, copy(), Ellipse, exec(), i, int, intersected(), n, Qt::OddEvenFill, p, QRegion(), QRGN_AND, QRGN_OR, QRGN_RECTS, QRGN_SETELLIPSE, QRGN_SETPTARRAY_ALT, QRGN_SETPTARRAY_WIND, QRGN_SETRECT, QRGN_SUB, QRGN_TRANSLATE, QRGN_XOR, qWarning(), QIODevice::ReadOnly, Rectangle, s, subtracted(), translate(), united(), Qt::WindingFill, and xored().

Referenced by exec().

00233 {
00234     QByteArray copy = buffer;
00235     QDataStream s(&copy, QIODevice::ReadOnly);
00236     if (ver)
00237         s.setVersion(ver);
00238     QRegion rgn;
00239 #ifndef QT_NO_DEBUG
00240     int test_cnt = 0;
00241 #endif
00242     while (!s.atEnd()) {
00243         qint32 id;
00244         if (s.version() == 1) {
00245             int id_int;
00246             s >> id_int;
00247             id = id_int;
00248         } else {
00249             s >> id;
00250         }
00251 #ifndef QT_NO_DEBUG
00252         if (test_cnt > 0 && id != QRGN_TRANSLATE)
00253             qWarning("QRegion::exec: Internal error");
00254         test_cnt++;
00255 #endif
00256         if (id == QRGN_SETRECT || id == QRGN_SETELLIPSE) {
00257             QRect r;
00258             s >> r;
00259             rgn = QRegion(r, id == QRGN_SETRECT ? Rectangle : Ellipse);
00260         } else if (id == QRGN_SETPTARRAY_ALT || id == QRGN_SETPTARRAY_WIND) {
00261             QPolygon a;
00262             s >> a;
00263             rgn = QRegion(a, id == QRGN_SETPTARRAY_WIND ? Qt::WindingFill : Qt::OddEvenFill);
00264         } else if (id == QRGN_TRANSLATE) {
00265             QPoint p;
00266             s >> p;
00267             rgn.translate(p.x(), p.y());
00268         } else if (id >= QRGN_OR && id <= QRGN_XOR) {
00269             QByteArray bop1, bop2;
00270             QRegion r1, r2;
00271             s >> bop1;
00272             r1.exec(bop1);
00273             s >> bop2;
00274             r2.exec(bop2);
00275 
00276             switch (id) {
00277                 case QRGN_OR:
00278                     rgn = r1.united(r2);
00279                     break;
00280                 case QRGN_AND:
00281                     rgn = r1.intersected(r2);
00282                     break;
00283                 case QRGN_SUB:
00284                     rgn = r1.subtracted(r2);
00285                     break;
00286                 case QRGN_XOR:
00287                     rgn = r1.xored(r2);
00288                     break;
00289             }
00290         } else if (id == QRGN_RECTS) {
00291             // (This is the only form used in Qt 2.0)
00292             quint32 n;
00293             s >> n;
00294             QRect r;
00295             for (int i=0; i<(int)n; i++) {
00296                 s >> r;
00297                 rgn = rgn.united(QRegion(r));
00298             }
00299         }
00300     }
00301     *this = rgn;
00302 }

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void QRegion::cleanUp ( QRegionData *  x  )  [static, private]

Definition at line 2509 of file qregion_unix.cpp.

02513 {
02514     delete x->qt_rgn;
02515 #if defined(Q_WS_X11)
02516     if (x->rgn)
02517         XDestroyRegion(x->rgn);
02518     if (x->xrectangles)
02519         free(x->xrectangles);
02520 #elif defined(Q_WS_MAC)
02521     if (x->rgn)
02522         qt_mac_dispose_rgn(x->rgn);

Friends And Related Function Documentation

QDataStream & operator<< ( QDataStream &  s,
const QRegion &  r 
) [friend]

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

See also:
Format of the QDataStream operators

Definition at line 318 of file qregion.cpp.

00319 {
00320     QVector<QRect> a = r.rects();
00321     if (a.isEmpty()) {
00322         s << (quint32)0;
00323     } else {
00324         if (s.version() == 1) {
00325             int i;
00326             for (i = a.size() - 1; i > 0; --i) {
00327                 s << (quint32)(12 + i * 24);
00328                 s << (int)QRGN_OR;
00329             }
00330             for (i = 0; i < a.size(); ++i) {
00331                 s << (quint32)(4+8) << (int)QRGN_SETRECT << a[i];
00332             }
00333         } else {
00334             s << (quint32)(4 + 4 + 16 * a.size()); // 16: storage size of QRect
00335             s << (qint32)QRGN_RECTS;
00336             s << a;
00337         }
00338     }
00339     return s;
00340 }

QDataStream & operator>> ( QDataStream &  s,
QRegion &  r 
) [friend]

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

See also:
Format of the QDataStream operators

Definition at line 351 of file qregion.cpp.

00352 {
00353     QByteArray b;
00354     s >> b;
00355     r.exec(b, s.version());
00356     return s;
00357 }

Member Data Documentation

struct QRegionData* QRegion::d [private]

Definition at line 161 of file qregion.h.

Referenced by detach(), and QRegion().

QRegion::QRegionData QRegion::shared_empty [static, private]

Definition at line 162 of file qregion.h.

The documentation for this class was generated from the following files:
Generated on Thu Mar 15 18:49:27 2007 for Qt 4.2 User's Guide by  doxygen 1.5.1