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<title>Qt 4.0: QRegion Class Reference</title>
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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="annotated.html"><font color="#004faf">Annotated</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td>
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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">QRegion Class Reference</h1>
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<p>The QRegion class specifies a clip region for a painter. <a href="#details">More...</a></p>
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<pre>#include <QRegion></pre><p>Part of the <a href="qtgui.html">QtGui</a> module.</p>
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<li><a href="qregion-members.html">List of all members, including inherited members</a></li>
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<li><a href="qregion-qt3.html">Qt 3 support members</a></li>
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<a name="public-types"></a>
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<li><div class="fn"/>enum <b><a href="qregion.html#RegionType-enum">RegionType</a></b> { Rectangle, Ellipse }</li>
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<a name="public-functions"></a>
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<h3>Public Functions</h3>
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<li><div class="fn"/><b><a href="qregion.html#QRegion">QRegion</a></b> ()</li>
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<li><div class="fn"/><b><a href="qregion.html#QRegion-2">QRegion</a></b> ( int <i>x</i>, int <i>y</i>, int <i>w</i>, int <i>h</i>, RegionType <i>t</i> = Rectangle )</li>
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<li><div class="fn"/><b><a href="qregion.html#QRegion-3">QRegion</a></b> ( const QPolygon & <i>a</i>, Qt::FillRule <i>fillRule</i> = Qt::OddEvenFill )</li>
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<li><div class="fn"/><b><a href="qregion.html#QRegion-5">QRegion</a></b> ( const QRegion & <i>r</i> )</li>
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<li><div class="fn"/><b><a href="qregion.html#QRegion-6">QRegion</a></b> ( const QBitmap & <i>bm</i> )</li>
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<li><div class="fn"/><b><a href="qregion.html#QRegion-7">QRegion</a></b> ( const QRect & <i>r</i>, RegionType <i>t</i> = Rectangle )</li>
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<li><div class="fn"/><b><a href="qregion.html#dtor.QRegion">~QRegion</a></b> ()</li>
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<li><div class="fn"/>QRect <b><a href="qregion.html#boundingRect">boundingRect</a></b> () const</li>
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<li><div class="fn"/>bool <b><a href="qregion.html#contains">contains</a></b> ( const QPoint & <i>p</i> ) const</li>
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<li><div class="fn"/>bool <b><a href="qregion.html#contains-2">contains</a></b> ( const QRect & <i>r</i> ) const</li>
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<li><div class="fn"/>QRegion <b><a href="qregion.html#eor">eor</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>Handle <b><a href="qregion.html#handle">handle</a></b> () const</li>
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<li><div class="fn"/>Region <b><a href="qregion.html#handle-2">handle</a></b> () const</li>
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<li><div class="fn"/>void * <b><a href="qregion.html#handle-3">handle</a></b> () const</li>
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<li><div class="fn"/>QRegion <b><a href="qregion.html#intersect">intersect</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>bool <b><a href="qregion.html#isEmpty">isEmpty</a></b> () const</li>
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<li><div class="fn"/>QVector<QRect> <b><a href="qregion.html#rects">rects</a></b> () const</li>
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<li><div class="fn"/>QRegion <b><a href="qregion.html#subtract">subtract</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>void <b><a href="qregion.html#translate">translate</a></b> ( int <i>dx</i>, int <i>dy</i> )</li>
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<li><div class="fn"/>void <b><a href="qregion.html#translate-2">translate</a></b> ( const QPoint & <i>point</i> )</li>
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<li><div class="fn"/>QRegion <b><a href="qregion.html#unite">unite</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/><b><a href="qregion.html#operator-QVariant">operator QVariant</a></b> () const</li>
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<li><div class="fn"/>bool <b><a href="qregion.html#operator-not-eq">operator!=</a></b> ( const QRegion & <i>other</i> ) const</li>
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<li><div class="fn"/>const QRegion <b><a href="qregion.html#operator-and">operator&</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>QRegion & <b><a href="qregion.html#operator-and-eq">operator&=</a></b> ( const QRegion & <i>r</i> )</li>
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<li><div class="fn"/>const QRegion <b><a href="qregion.html#operator-2b">operator+</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>QRegion & <b><a href="qregion.html#operator-2b-eq">operator+=</a></b> ( const QRegion & <i>r</i> )</li>
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<li><div class="fn"/>const QRegion <b><a href="qregion.html#operator-">operator-</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>QRegion & <b><a href="qregion.html#operator--eq">operator-=</a></b> ( const QRegion & <i>r</i> )</li>
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<li><div class="fn"/>QRegion & <b><a href="qregion.html#operator-eq">operator=</a></b> ( const QRegion & <i>r</i> )</li>
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<li><div class="fn"/>bool <b><a href="qregion.html#operator-eq-eq">operator==</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>const QRegion <b><a href="qregion.html#operator-5e">operator^</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>QRegion & <b><a href="qregion.html#operator-5e-eq">operator^=</a></b> ( const QRegion & <i>r</i> )</li>
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<li><div class="fn"/>const QRegion <b><a href="qregion.html#operator-7c">operator|</a></b> ( const QRegion & <i>r</i> ) const</li>
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<li><div class="fn"/>QRegion & <b><a href="qregion.html#operator-7c-eq">operator|=</a></b> ( const QRegion & <i>r</i> )</li>
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<a name="related-non-members"></a>
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<h3>Related Non-Members</h3>
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<li><div class="fn"/>QDataStream & <b><a href="qregion.html#operator-lt-lt-76">operator<<</a></b> ( QDataStream & <i>s</i>, const QRegion & <i>r</i> )</li>
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<li><div class="fn"/>QDataStream & <b><a href="qregion.html#operator-gt-gt-52">operator>></a></b> ( QDataStream & <i>s</i>, QRegion & <i>r</i> )</li>
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<a name="details"></a>
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<h2>Detailed Description</h2>
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<p>The QRegion class specifies a clip region for a painter.</p>
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<p>QRegion is used with <a href="qpainter.html#setClipRegion">QPainter::setClipRegion</a>() to limit the paint area to what needs to be painted. There is also a <a href="qwidget.html#repaint">QWidget::repaint</a>() function that takes a QRegion parameter. QRegion is the best tool for reducing flicker.</p>
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<p>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 <a href="qregion.html#unite">unite</a>(), <a href="qregion.html#intersect">intersect</a>(), <a href="qregion.html#subtract">subtract</a>(), or <a href="qregion.html#eor">eor</a>() (exclusive or). You can move a region using <a href="qregion.html#translate">translate</a>().</p>
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<p>You can test whether a region <a href="qregion.html#isEmpty">isEmpty</a>() or if it <a href="qregion.html#contains">contains</a>() a <a href="qpoint.html">QPoint</a> or <a href="qrect.html">QRect</a>. The bounding rectangle can be found with <a href="qregion.html#boundingRect">boundingRect</a>().</p>
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<p>The function <a href="qregion.html#rects">rects</a>() gives a decomposition of the region into rectangles.</p>
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<p>Example of using complex regions:</p>
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<pre> void MyWidget::paintEvent(QPaintEvent *)
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QPainter p; // our painter
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QRegion r1(QRect(100,100,200,80), // r1 = elliptic region
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QRegion r2(QRect(100,120,90,30)); // r2 = rectangular region
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QRegion r3 = r1.intersect(r2); // r3 = intersection
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p.begin(this); // start painting widget
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p.setClipRegion(r3); // set clip region
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... // paint clipped graphics
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p.end(); // painting done
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<p>QRegion is an <a href="shclass.html">implicitly shared</a> class.</p>
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<p><b>Warning:</b> 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 <a href="qpainterpath.html">QPainterPath</a>.</p>
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<p>See also <a href="qpainter.html#setClipRegion">QPainter::setClipRegion</a>(), <a href="qpainter.html#setClipRect">QPainter::setClipRect</a>(), and <a href="qpainterpath.html">QPainterPath</a>.</p>
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<h2>Member Type Documentation</h2>
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<h3 class="fn"><a name="RegionType-enum"></a>enum QRegion::RegionType</h3>
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<p>Specifies the shape of the region to be created.</p>
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<table border="1" cellpadding="2" cellspacing="1" width="100%">
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<tr><th width="25%">Constant</th><th width="15%">Value</th><th width="60%">Description</th></tr>
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<tr><td valign="top"><tt>QRegion::Rectangle</tt></td><td align="center" valign="top"><tt>0</tt></td><td valign="top">the region covers the entire rectangle.</td></tr>
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<tr><td valign="top"><tt>QRegion::Ellipse</tt></td><td align="center" valign="top"><tt>1</tt></td><td valign="top">the region is an ellipse inside the rectangle.</td></tr>
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<h2>Member Function Documentation</h2>
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<h3 class="fn"><a name="QRegion"></a>QRegion::QRegion ()</h3>
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<p>Constructs an empty region.</p>
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<p>See also <a href="qregion.html#isEmpty">isEmpty</a>().</p>
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<h3 class="fn"><a name="QRegion-2"></a>QRegion::QRegion ( int <i>x</i>, int <i>y</i>, int <i>w</i>, int <i>h</i>, <a href="qregion.html#RegionType-enum">RegionType</a> <i>t</i> = Rectangle )</h3>
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<p>Constructs a rectangular or elliptic region.</p>
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<p>If <i>t</i> is <tt>Rectangle</tt>, the region is the filled rectangle (<i>x</i>, <i>y</i>, <i>w</i>, <i>h</i>). If <i>t</i> is <tt>Ellipse</tt>, the region is the filled ellipse with center at (<i>x</i> + <i>w</i> / 2, <i>y</i> + <i>h</i> / 2) and size (<i>w</i> ,<i>h</i>).</p>
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<h3 class="fn"><a name="QRegion-3"></a>QRegion::QRegion ( const <a href="qpolygon.html">QPolygon</a> & <i>a</i>, <a href="qt.html#FillRule-enum">Qt::FillRule</a> <i>fillRule</i> = Qt::OddEvenFill )</h3>
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<p>Constructs a polygon region from the point array <i>a</i> with the fill rule specified by <i>fillRule</i>.</p>
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<p>If <i>fillRule</i> is <a href="qt.html#FillRule-enum">Qt::WindingFill</a>, the polygon region is defined using the winding algorithm; if it is <a href="qt.html#FillRule-enum">Qt::OddEvenFill</a>, the odd-even fill algorithm is used.</p>
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<p><b>Warning:</b> This constructor can be used to create complex regions that will slow down painting when used.</p>
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<h3 class="fn"><a name="QRegion-5"></a>QRegion::QRegion ( const QRegion & <i>r</i> )</h3>
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<p>Constructs a new region which is equal to region <i>r</i>.</p>
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<h3 class="fn"><a name="QRegion-6"></a>QRegion::QRegion ( const <a href="qbitmap.html">QBitmap</a> & <i>bm</i> )</h3>
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<p>Constructs a region from the bitmap <i>bm</i>.</p>
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<p>The resulting region consists of the pixels in bitmap <i>bm</i> that are <tt>Qt::color1</tt>, as if each pixel was a 1 by 1 rectangle.</p>
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<p>This constructor may create complex regions that will slow down painting when used. Note that drawing masked pixmaps can be done much faster using <a href="qpixmap.html#setMask">QPixmap::setMask</a>().</p>
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<h3 class="fn"><a name="QRegion-7"></a>QRegion::QRegion ( const <a href="qrect.html">QRect</a> & <i>r</i>, <a href="qregion.html#RegionType-enum">RegionType</a> <i>t</i> = Rectangle )</h3>
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<p>Create a region based on the rectange <i>r</i> with region type <i>t</i>.</p>
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<p>If the rectangle is invalid a null region will be created.</p>
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<p>See also <a href="qregion.html#RegionType-enum">QRegion::RegionType</a>.</p>
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<h3 class="fn"><a name="dtor.QRegion"></a>QRegion::~QRegion ()</h3>
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<p>Destroys the region.</p>
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<h3 class="fn"><a name="boundingRect"></a><a href="qrect.html">QRect</a> QRegion::boundingRect () const</h3>
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<p>Returns the bounding rectangle of this region. An empty region gives a rectangle that is <a href="qrect.html#isNull">QRect::isNull</a>().</p>
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<h3 class="fn"><a name="contains"></a>bool QRegion::contains ( const <a href="qpoint.html">QPoint</a> & <i>p</i> ) const</h3>
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<p>Returns true if the region contains the point <i>p</i>; otherwise returns false.</p>
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<h3 class="fn"><a name="contains-2"></a>bool QRegion::contains ( const <a href="qrect.html">QRect</a> & <i>r</i> ) const</h3>
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<p>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.</p>
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<p>Returns true if the region overlaps the rectangle <i>r</i>; otherwise returns false.</p>
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<h3 class="fn"><a name="eor"></a>QRegion QRegion::eor ( const QRegion & <i>r</i> ) const</h3>
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<p>Returns a region which is the exclusive or (XOR) of this region and <i>r</i>.</p>
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<center><img src="images/rxor.png" alt="Region XORed" /></center><p>The figure shows the exclusive or of two elliptical regions.</p>
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<h3 class="fn"><a name="handle"></a>Handle QRegion::handle () const</h3>
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<p>Returns a platform-specific region handle. The <tt>Handle</tt> type is <tt>HRGN</tt> on Windows, <tt>Region</tt> on <a href="winsystem.html#x11">X11</a>, and <tt>RgnHandle</tt> on Mac OS X.</p>
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<p><b>Warning:</b> This function is not portable.</p>
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<h3 class="fn"><a name="handle-2"></a>Region QRegion::handle () const</h3>
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<p>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.</p>
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<h3 class="fn"><a name="handle-3"></a>void * QRegion::handle () const</h3>
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<p>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.</p>
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<h3 class="fn"><a name="intersect"></a>QRegion QRegion::intersect ( const QRegion & <i>r</i> ) const</h3>
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<p>Returns a region which is the intersection of this region and <i>r</i>.</p>
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<center><img src="images/rintersect.png" alt="Region Intersection" /></center><p>The figure shows the intersection of two elliptical regions.</p>
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<h3 class="fn"><a name="isEmpty"></a>bool QRegion::isEmpty () const</h3>
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<p>Returns true if the region is empty; otherwise returns false. An empty region is a region that contains no points.</p>
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<pre> QRegion r1(10, 10, 20, 20);
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QRegion r2(40, 40, 20, 20);
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r1.isNull(); // false
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r1.isEmpty(); // false
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r3.isEmpty(); // true
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r3 = r1.intersect(r2); // r3 = intersection of r1 and r2
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r3.isNull(); // false
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r3.isEmpty(); // true
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r3 = r1.unite(r2); // r3 = union of r1 and r2
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r3.isNull(); // false
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r3.isEmpty(); // false</pre>
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<h3 class="fn"><a name="rects"></a><a href="qvector.html">QVector</a><<a href="qrect.html">QRect</a>> QRegion::rects () const</h3>
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<p>Returns an array of non-overlapping rectangles that make up the region.</p>
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<p>The union of all the rectangles is equal to the original region.</p>
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<h3 class="fn"><a name="subtract"></a>QRegion QRegion::subtract ( const QRegion & <i>r</i> ) const</h3>
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<p>Returns a region which is <i>r</i> subtracted from this region.</p>
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<center><img src="images/rsubtract.png" alt="Region Subtraction" /></center><p>The figure shows the result when the ellipse on the right is subtracted from the ellipse on the left. (<tt>left-right</tt>)</p>
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<h3 class="fn"><a name="translate"></a>void QRegion::translate ( int <i>dx</i>, int <i>dy</i> )</h3>
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<p>Translates (moves) the region <i>dx</i> along the X axis and <i>dy</i> along the Y axis.</p>
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<h3 class="fn"><a name="translate-2"></a>void QRegion::translate ( const <a href="qpoint.html">QPoint</a> & <i>point</i> )</h3>
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<p>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.</p>
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<p>Translates to the given <i>point</i>.</p>
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<h3 class="fn"><a name="unite"></a>QRegion QRegion::unite ( const QRegion & <i>r</i> ) const</h3>
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<p>Returns a region which is the union of this region and <i>r</i>.</p>
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<center><img src="images/runion.png" alt="Region Union" /></center><p>The figure shows the union of two elliptical regions.</p>
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<h3 class="fn"><a name="operator-QVariant"></a>QRegion::operator QVariant () const</h3>
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<p>Returns the region as a <a href="qvariant.html">QVariant</a></p>
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<h3 class="fn"><a name="operator-not-eq"></a>bool QRegion::operator!= ( const QRegion & <i>other</i> ) const</h3>
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<p>Returns true if this region is different from the <i>other</i> region; otherwise returns false.</p>
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<h3 class="fn"><a name="operator-and"></a>const QRegion QRegion::operator& ( const QRegion & <i>r</i> ) const</h3>
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<p>Applies the <a href="qregion.html#intersect">intersect</a>() function to this region and <i>r</i>. <tt>r1&r2</tt> is equivalent to <tt>r1.intersect(r2)</tt></p>
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<p>See also <a href="qregion.html#intersect">intersect</a>().</p>
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<h3 class="fn"><a name="operator-and-eq"></a>QRegion & QRegion::operator&= ( const QRegion & <i>r</i> )</h3>
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<p>Applies the <a href="qregion.html#intersect">intersect</a>() function to this region and <i>r</i> and assigns the result to this region. <tt>r1&=r2</tt> is equivalent to <tt>r1=r1.intersect(r2)</tt></p>
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<p>See also <a href="qregion.html#intersect">intersect</a>().</p>
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<h3 class="fn"><a name="operator-2b"></a>const QRegion QRegion::operator+ ( const QRegion & <i>r</i> ) const</h3>
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<p>Applies the <a href="qregion.html#unite">unite</a>() function to this region and <i>r</i>. <tt>r1+r2</tt> is equivalent to <tt>r1.unite(r2)</tt></p>
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<p>See also <a href="qregion.html#unite">unite</a>() and <a href="qregion.html#operator-7c">operator|</a>().</p>
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<h3 class="fn"><a name="operator-2b-eq"></a>QRegion & QRegion::operator+= ( const QRegion & <i>r</i> )</h3>
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<p>Applies the <a href="qregion.html#unite">unite</a>() function to this region and <i>r</i> and assigns the result to this region. <tt>r1+=r2</tt> is equivalent to <tt>r1=r1.unite(r2)</tt></p>
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<p>See also <a href="qregion.html#intersect">intersect</a>().</p>
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<h3 class="fn"><a name="operator-"></a>const QRegion QRegion::operator- ( const QRegion & <i>r</i> ) const</h3>
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<p>Applies the <a href="qregion.html#subtract">subtract</a>() function to this region and <i>r</i>. <tt>r1-r2</tt> is equivalent to <tt>r1.subtract(r2)</tt></p>
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<p>See also <a href="qregion.html#subtract">subtract</a>().</p>
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<h3 class="fn"><a name="operator--eq"></a>QRegion & QRegion::operator-= ( const QRegion & <i>r</i> )</h3>
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<p>Applies the <a href="qregion.html#subtract">subtract</a>() function to this region and <i>r</i> and assigns the result to this region. <tt>r1-=r2</tt> is equivalent to <tt>r1=r1.subtract(r2)</tt></p>
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<p>See also <a href="qregion.html#subtract">subtract</a>().</p>
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<h3 class="fn"><a name="operator-eq"></a>QRegion & QRegion::operator= ( const QRegion & <i>r</i> )</h3>
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<p>Assigns <i>r</i> to this region and returns a reference to the region.</p>
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<h3 class="fn"><a name="operator-eq-eq"></a>bool QRegion::operator== ( const QRegion & <i>r</i> ) const</h3>
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<p>Returns true if the region is equal to <i>r</i>; otherwise returns false.</p>
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<h3 class="fn"><a name="operator-5e"></a>const QRegion QRegion::operator^ ( const QRegion & <i>r</i> ) const</h3>
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<p>Applies the <a href="qregion.html#eor">eor</a>() function to this region and <i>r</i>. <tt>r1^r2</tt> is equivalent to <tt>r1.eor(r2)</tt></p>
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<p>See also <a href="qregion.html#eor">eor</a>().</p>
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<h3 class="fn"><a name="operator-5e-eq"></a>QRegion & QRegion::operator^= ( const QRegion & <i>r</i> )</h3>
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<p>Applies the <a href="qregion.html#eor">eor</a>() function to this region and <i>r</i> and assigns the result to this region. <tt>r1^=r2</tt> is equivalent to <tt>r1=r1.eor(r2)</tt></p>
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<p>See also <a href="qregion.html#eor">eor</a>().</p>
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<h3 class="fn"><a name="operator-7c"></a>const QRegion QRegion::operator| ( const QRegion & <i>r</i> ) const</h3>
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<p>Applies the <a href="qregion.html#unite">unite</a>() function to this region and <i>r</i>. <tt>r1|r2</tt> is equivalent to <tt>r1.unite(r2)</tt></p>
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<p>See also <a href="qregion.html#unite">unite</a>() and <a href="qregion.html#operator-2b">operator+</a>().</p>
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<h3 class="fn"><a name="operator-7c-eq"></a>QRegion & QRegion::operator|= ( const QRegion & <i>r</i> )</h3>
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<p>Applies the <a href="qregion.html#unite">unite</a>() function to this region and <i>r</i> and assigns the result to this region. <tt>r1|=r2</tt> is equivalent to <tt>r1=r1.unite(r2)</tt></p>
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<p>See also <a href="qregion.html#unite">unite</a>().</p>
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<h2>Related Non-Members</h2>
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<h3 class="fn"><a name="operator-lt-lt-76"></a><a href="qdatastream.html">QDataStream</a> & operator<< ( <a href="qdatastream.html">QDataStream</a> & <i>s</i>, const QRegion & <i>r</i> )</h3>
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<p>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.</p>
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<p>Writes the region <i>r</i> to the stream <i>s</i> and returns a reference to the stream.</p>
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<p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.</p>
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<h3 class="fn"><a name="operator-gt-gt-52"></a><a href="qdatastream.html">QDataStream</a> & operator>> ( <a href="qdatastream.html">QDataStream</a> & <i>s</i>, QRegion & <i>r</i> )</h3>
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<p>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.</p>
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<p>Reads a region from the stream <i>s</i> into <i>r</i> and returns a reference to the stream.</p>
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<p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.</p>
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