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365 lines
21 KiB
365 lines
21 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qregion.cpp:44 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>QRegion Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" 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.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qregion-h.html">qregion.h</a>></tt>
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<p><a href="qregion-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>enum <a href="#RegionType-enum"><b>RegionType</b></a> { Rectangle, Ellipse }</li>
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<li class=fn><a href="#QRegion"><b>QRegion</b></a> ()</li>
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<li class=fn><a href="#QRegion-2"><b>QRegion</b></a> ( int x, int y, int w, int h, RegionType t = Rectangle )</li>
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<li class=fn><a href="#QRegion-3"><b>QRegion</b></a> ( const QRect & r, RegionType t = Rectangle )</li>
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<li class=fn><a href="#QRegion-4"><b>QRegion</b></a> ( const QPointArray & a, bool winding = FALSE )</li>
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<li class=fn><a href="#QRegion-5"><b>QRegion</b></a> ( const QRegion & r )</li>
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<li class=fn><a href="#QRegion-6"><b>QRegion</b></a> ( const QBitmap & bm )</li>
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<li class=fn><a href="#~QRegion"><b>~QRegion</b></a> ()</li>
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<li class=fn>QRegion & <a href="#operator-eq"><b>operator=</b></a> ( const QRegion & r )</li>
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<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li>
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<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
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<li class=fn>bool <a href="#contains"><b>contains</b></a> ( const QPoint & p ) const</li>
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<li class=fn>bool <a href="#contains-2"><b>contains</b></a> ( const QRect & r ) const</li>
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<li class=fn>void <a href="#translate"><b>translate</b></a> ( int dx, int dy )</li>
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<li class=fn>QRegion <a href="#unite"><b>unite</b></a> ( const QRegion & r ) const</li>
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<li class=fn>QRegion <a href="#intersect"><b>intersect</b></a> ( const QRegion & r ) const</li>
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<li class=fn>QRegion <a href="#subtract"><b>subtract</b></a> ( const QRegion & r ) const</li>
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<li class=fn>QRegion <a href="#eor"><b>eor</b></a> ( const QRegion & r ) const</li>
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<li class=fn>QRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li>
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<li class=fn>QMemArray<QRect> <a href="#rects"><b>rects</b></a> () const</li>
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<li class=fn>const QRegion <a href="#operator|"><b>operator|</b></a> ( const QRegion & r ) const</li>
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<li class=fn>const QRegion <a href="#operator+"><b>operator+</b></a> ( const QRegion & r ) const</li>
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<li class=fn>const QRegion <a href="#operator-and"><b>operator&</b></a> ( const QRegion & r ) const</li>
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<li class=fn>const QRegion <a href="#operator-"><b>operator-</b></a> ( const QRegion & r ) const</li>
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<li class=fn>const QRegion <a href="#operator^"><b>operator^</b></a> ( const QRegion & r ) const</li>
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<li class=fn>QRegion & <a href="#operator|-eq"><b>operator|=</b></a> ( const QRegion & r )</li>
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<li class=fn>QRegion & <a href="#operator+-eq"><b>operator+=</b></a> ( const QRegion & r )</li>
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<li class=fn>QRegion & <a href="#operator-and-eq"><b>operator&=</b></a> ( const QRegion & r )</li>
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<li class=fn>QRegion & <a href="#operator--eq"><b>operator-=</b></a> ( const QRegion & r )</li>
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<li class=fn>QRegion & <a href="#operator^-eq"><b>operator^=</b></a> ( const QRegion & r )</li>
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<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QRegion & r ) const</li>
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<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QRegion & r ) const</li>
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<li class=fn>HRGN <a href="#handle"><b>handle</b></a> () const</li>
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</ul>
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<h2>Related Functions</h2>
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<ul>
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<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QRegion & r )</li>
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<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QRegion & r )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The QRegion class specifies a clip region for a painter.
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<p>
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<p> QRegion is used with <a href="qpainter.html#setClipRegion">QPainter::setClipRegion</a>() to limit the paint
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area to what needs to be painted. There is also a
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<a href="qwidget.html#repaint">QWidget::repaint</a>() that takes a QRegion parameter. QRegion is the
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best tool for reducing flicker.
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<p> A region can be created from a rectangle, an ellipse, a polygon or
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a bitmap. Complex regions may be created by combining simple
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regions using <a href="#unite">unite</a>(), <a href="#intersect">intersect</a>(), <a href="#subtract">subtract</a>() or <a href="#eor">eor</a>() (exclusive
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or). You can move a region using <a href="#translate">translate</a>().
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<p> You can test whether a region <a href="#isNull">isNull</a>(), <a href="#isEmpty">isEmpty</a>() or if it
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<a href="#contains">contains</a>() a <a href="qpoint.html">QPoint</a> or <a href="qrect.html">QRect</a>. The bounding rectangle is given by
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<a href="#boundingRect">boundingRect</a>().
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<p> The function <a href="#rects">rects</a>() gives a decomposition of the region into
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rectangles.
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<p> Example of using complex regions:
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<pre>
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void MyWidget::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
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{
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<a href="qpainter.html">QPainter</a> p; // our painter
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QRegion r1( QRect(100,100,200,80), // r1 = elliptic region
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QRegion::<a href="#RegionType-enum">Ellipse</a> );
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QRegion r2( QRect(100,120,90,30) ); // r2 = rectangular region
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QRegion r3 = r1.<a href="#intersect">intersect</a>( r2 ); // r3 = intersection
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p.<a href="qpainter.html#begin">begin</a>( this ); // start painting widget
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p.<a href="qpainter.html#setClipRegion">setClipRegion</a>( r3 ); // set clip region
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... // paint clipped graphics
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p.<a href="qpainter.html#end">end</a>(); // painting done
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}
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</pre>
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<p> QRegion is an <a href="shclass.html">implicitly shared</a> class.
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<p> <b>Warning:</b> Due to window system limitations, the whole coordinate
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space for a region is limited to the points between -32767 and
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32767 on Mac OS X and Windows 95/98/ME.
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<p> <p>See also <a href="qpainter.html#setClipRegion">QPainter::setClipRegion</a>(), <a href="qpainter.html#setClipRect">QPainter::setClipRect</a>(), <a href="graphics.html">Graphics Classes</a>, and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="RegionType-enum"></a>QRegion::RegionType</h3>
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<p> Specifies the shape of the region to be created.
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<ul>
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<li><tt>QRegion::Rectangle</tt> - the region covers the entire rectangle.
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<li><tt>QRegion::Ellipse</tt> - the region is an ellipse inside the rectangle.
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QRegion"></a>QRegion::QRegion ()
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</h3>
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Constructs a null region.
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<p> <p>See also <a href="#isNull">isNull</a>().
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<h3 class=fn><a name="QRegion-2"></a>QRegion::QRegion ( int x, int y, int w, int h, <a href="qregion.html#RegionType-enum">RegionType</a> t = Rectangle )
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</h3>
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Constructs a rectangular or elliptic region.
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<p> If <em>t</em> is <a href="#RegionType-enum">Rectangle</a>, the region is the filled rectangle (<em>x</em>,
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<em>y</em>, <em>w</em>, <em>h</em>). If <em>t</em> is <a href="#RegionType-enum">Ellipse</a>, the region is the filled
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ellipse with center at (<em>x</em> + <em>w</em> / 2, <em>y</em> + <em>h</em> / 2) and size
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(<em>w</em> ,<em>h</em> ).
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<h3 class=fn><a name="QRegion-3"></a>QRegion::QRegion ( const <a href="qrect.html">QRect</a> & r, <a href="qregion.html#RegionType-enum">RegionType</a> t = Rectangle )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Create a region based on the rectange <em>r</em> with region type <em>t</em>.
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<p> If the rectangle is invalid a null region will be created.
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<p> <p>See also <a href="#RegionType-enum">QRegion::RegionType</a>.
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<h3 class=fn><a name="QRegion-4"></a>QRegion::QRegion ( const <a href="qpointarray.html">QPointArray</a> & a, bool winding = FALSE )
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</h3>
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Constructs a polygon region from the point array <em>a</em>.
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<p> If <em>winding</em> is TRUE, the polygon region is filled using the
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winding algorithm, otherwise the default even-odd fill algorithm
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is used.
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<p> This constructor may create complex regions that will slow down
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painting when used.
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<h3 class=fn><a name="QRegion-5"></a>QRegion::QRegion ( const <a href="qregion.html">QRegion</a> & r )
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</h3>
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Constructs a new region which is equal to region <em>r</em>.
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<h3 class=fn><a name="QRegion-6"></a>QRegion::QRegion ( const <a href="qbitmap.html">QBitmap</a> & bm )
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</h3>
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Constructs a region from the bitmap <em>bm</em>.
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<p> The resulting region consists of the pixels in bitmap <em>bm</em> that
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are <tt>color1</tt>, as if each pixel was a 1 by 1 rectangle.
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<p> This constructor may create complex regions that will slow down
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painting when used. Note that drawing masked pixmaps can be done
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much faster using <a href="qpixmap.html#setMask">QPixmap::setMask</a>().
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<h3 class=fn><a name="~QRegion"></a>QRegion::~QRegion ()
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</h3>
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Destroys the region.
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<h3 class=fn><a href="qrect.html">QRect</a> <a name="boundingRect"></a>QRegion::boundingRect () const
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</h3>
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Returns the bounding rectangle of this region. An empty region
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gives a rectangle that is <a href="qrect.html#isNull">QRect::isNull</a>().
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<h3 class=fn>bool <a name="contains"></a>QRegion::contains ( const <a href="qpoint.html">QPoint</a> & p ) const
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</h3>
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Returns TRUE if the region contains the point <em>p</em>; otherwise
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returns FALSE.
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<h3 class=fn>bool <a name="contains-2"></a>QRegion::contains ( const <a href="qrect.html">QRect</a> & r ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns TRUE if the region overlaps the rectangle <em>r</em>; otherwise
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returns FALSE.
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<h3 class=fn><a href="qregion.html">QRegion</a> <a name="eor"></a>QRegion::eor ( const <a href="qregion.html">QRegion</a> & r ) const
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</h3>
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Returns a region which is the exclusive or (XOR) of this region
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and <em>r</em>.
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<p> <center><img src="rxor.png" alt="Region XORed"></center>
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<p> The figure shows the exclusive or of two elliptical regions.
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<h3 class=fn>HRGN <a name="handle"></a>QRegion::handle () const
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</h3>
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<p> Returns the region's handle.
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<h3 class=fn><a href="qregion.html">QRegion</a> <a name="intersect"></a>QRegion::intersect ( const <a href="qregion.html">QRegion</a> & r ) const
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</h3>
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Returns a region which is the intersection of this region and <em>r</em>.
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<p> <center><img src="rintersect.png" alt="Region Intersection"></center>
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<p> The figure shows the intersection of two elliptical regions.
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<h3 class=fn>bool <a name="isEmpty"></a>QRegion::isEmpty () const
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</h3>
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Returns TRUE if the region is empty; otherwise returns FALSE. An
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empty region is a region that contains no points.
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<p> Example:
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<pre>
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QRegion r1( 10, 10, 20, 20 );
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QRegion r2( 40, 40, 20, 20 );
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QRegion r3;
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r1.<a href="#isNull">isNull</a>(); // FALSE
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r1.<a href="#isEmpty">isEmpty</a>(); // FALSE
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r3.<a href="#isNull">isNull</a>(); // TRUE
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r3.<a href="#isEmpty">isEmpty</a>(); // TRUE
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r3 = r1.<a href="#intersect">intersect</a>( r2 ); // r3 = intersection of r1 and r2
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r3.<a href="#isNull">isNull</a>(); // FALSE
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r3.<a href="#isEmpty">isEmpty</a>(); // TRUE
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r3 = r1.<a href="#unite">unite</a>( r2 ); // r3 = union of r1 and r2
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r3.<a href="#isNull">isNull</a>(); // FALSE
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r3.<a href="#isEmpty">isEmpty</a>(); // FALSE
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</pre>
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<p> <p>See also <a href="#isNull">isNull</a>().
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<h3 class=fn>bool <a name="isNull"></a>QRegion::isNull () const
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</h3>
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Returns TRUE if the region is a null region; otherwise returns
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FALSE.
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<p> A null region is a region that has not been initialized. A null
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region is always empty.
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<p> <p>See also <a href="#isEmpty">isEmpty</a>().
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<h3 class=fn>bool <a name="operator!-eq"></a>QRegion::operator!= ( const <a href="qregion.html">QRegion</a> & r ) const
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</h3>
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<p> Returns TRUE if the region is different from <em>r</em>; otherwise
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returns FALSE.
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<h3 class=fn>const <a href="qregion.html">QRegion</a> <a name="operator-and"></a>QRegion::operator& ( const <a href="qregion.html">QRegion</a> & r ) const
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</h3>
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Applies the <a href="#intersect">intersect</a>() function to this region and <em>r</em>. <tt>r1&r2</tt>
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is equivalent to <tt>r1.intersect(r2)</tt>
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<p> <p>See also <a href="#intersect">intersect</a>().
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<h3 class=fn><a href="qregion.html">QRegion</a> & <a name="operator-and-eq"></a>QRegion::operator&= ( const <a href="qregion.html">QRegion</a> & r )
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</h3>
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Applies the <a href="#intersect">intersect</a>() function to this region and <em>r</em> and
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assigns the result to this region. <tt>r1&=r2</tt> is equivalent to <tt>r1=r1.intersect(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#intersect">intersect</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qregion.html">QRegion</a> <a name="operator+"></a>QRegion::operator+ ( const <a href="qregion.html">QRegion</a> & r ) const
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em>. <tt>r1+r2</tt> is
|
||
|
|
equivalent to <tt>r1.unite(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#unite">unite</a>() and <a href="#operator|">operator|</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> & <a name="operator+-eq"></a>QRegion::operator+= ( const <a href="qregion.html">QRegion</a> & r )
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em> and assigns
|
||
|
|
the result to this region. <tt>r1+=r2</tt> is equivalent to <tt>r1=r1.unite(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#intersect">intersect</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qregion.html">QRegion</a> <a name="operator-"></a>QRegion::operator- ( const <a href="qregion.html">QRegion</a> & r ) const
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#subtract">subtract</a>() function to this region and <em>r</em>. <tt>r1-r2</tt>
|
||
|
|
is equivalent to <tt>r1.subtract(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#subtract">subtract</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> & <a name="operator--eq"></a>QRegion::operator-= ( const <a href="qregion.html">QRegion</a> & r )
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#subtract">subtract</a>() function to this region and <em>r</em> and
|
||
|
|
assigns the result to this region. <tt>r1-=r2</tt> is equivalent to <tt>r1=r1.subtract(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#subtract">subtract</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> & <a name="operator-eq"></a>QRegion::operator= ( const <a href="qregion.html">QRegion</a> & r )
|
||
|
|
</h3>
|
||
|
|
Assigns <em>r</em> to this region and returns a reference to the region.
|
||
|
|
|
||
|
|
<h3 class=fn>bool <a name="operator-eq-eq"></a>QRegion::operator== ( const <a href="qregion.html">QRegion</a> & r ) const
|
||
|
|
</h3>
|
||
|
|
Returns TRUE if the region is equal to <em>r</em>; otherwise returns
|
||
|
|
FALSE.
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qregion.html">QRegion</a> <a name="operator^"></a>QRegion::operator^ ( const <a href="qregion.html">QRegion</a> & r ) const
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#eor">eor</a>() function to this region and <em>r</em>. <tt>r1^r2</tt> is
|
||
|
|
equivalent to <tt>r1.eor(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#eor">eor</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> & <a name="operator^-eq"></a>QRegion::operator^= ( const <a href="qregion.html">QRegion</a> & r )
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#eor">eor</a>() function to this region and <em>r</em> and
|
||
|
|
assigns the result to this region. <tt>r1^=r2</tt> is equivalent to <tt>r1=r1.eor(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#eor">eor</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>const <a href="qregion.html">QRegion</a> <a name="operator|"></a>QRegion::operator| ( const <a href="qregion.html">QRegion</a> & r ) const
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em>. <tt>r1|r2</tt> is
|
||
|
|
equivalent to <tt>r1.unite(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#unite">unite</a>() and <a href="#operator+">operator+</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> & <a name="operator|-eq"></a>QRegion::operator|= ( const <a href="qregion.html">QRegion</a> & r )
|
||
|
|
</h3>
|
||
|
|
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em> and assigns
|
||
|
|
the result to this region. <tt>r1|=r2</tt> is equivalent to <tt>r1=r1.unite(r2)</tt>
|
||
|
|
<p> <p>See also <a href="#unite">unite</a>().
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qmemarray.html">QMemArray</a><QRect> <a name="rects"></a>QRegion::rects () const
|
||
|
|
</h3>
|
||
|
|
Returns an array of non-overlapping rectangles that make up the
|
||
|
|
region.
|
||
|
|
<p> The union of all the rectangles is equal to the original region.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> <a name="subtract"></a>QRegion::subtract ( const <a href="qregion.html">QRegion</a> & r ) const
|
||
|
|
</h3>
|
||
|
|
Returns a region which is <em>r</em> subtracted from this region.
|
||
|
|
<p> <center><img src="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> )
|
||
|
|
|
||
|
|
<h3 class=fn>void <a name="translate"></a>QRegion::translate ( int dx, int dy )
|
||
|
|
</h3>
|
||
|
|
Translates (moves) the region <em>dx</em> along the X axis and <em>dy</em>
|
||
|
|
along the Y axis.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qregion.html">QRegion</a> <a name="unite"></a>QRegion::unite ( const <a href="qregion.html">QRegion</a> & r ) const
|
||
|
|
</h3>
|
||
|
|
Returns a region which is the union of this region and <em>r</em>.
|
||
|
|
<p> <center><img src="runion.png" alt="Region Union"></center>
|
||
|
|
<p> The figure shows the union of two elliptical regions.
|
||
|
|
|
||
|
|
<hr><h2>Related Functions</h2>
|
||
|
|
<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">QDataStream</a> & s, const <a href="qregion.html">QRegion</a> & r )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Writes the region <em>r</em> to the stream <em>s</em> and returns a reference
|
||
|
|
to the stream.
|
||
|
|
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
||
|
|
|
||
|
|
<h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qregion.html">QRegion</a> & r )
|
||
|
|
</h3>
|
||
|
|
|
||
|
|
<p> Reads a region from the stream <em>s</em> into <em>r</em> and returns a
|
||
|
|
reference to the stream.
|
||
|
|
<p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">Qt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|