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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="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">QPolygon Class Reference<br /><span class="small-subtitle">[<a href="qtgui.html">QtGui</a> module]</span>
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<p>The QPolygon class provides a vector of points using integer precision. <a href="#details">More...</a></p>
<pre> #include <QPolygon></pre><p>Inherits <a href="qvector.html">QVector<QPoint></a>.</p>
<p>Inherited by <a href="q3pointarray.html" class="compat">Q3PointArray</a>.</p>
<p><b>Note:</b> All functions in this class are <a href="threads-reentrancy.html#reentrant">reentrant</a>.</p>
<ul>
<li><a href="qpolygon-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary" border="0" cellpadding="0" cellspacing="0" width="100%">
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#QPolygon">QPolygon</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#QPolygon-2">QPolygon</a></b> ( int <i>size</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#QPolygon-3">QPolygon</a></b> ( const QPolygon & <i>polygon</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#QPolygon-4">QPolygon</a></b> ( const QVector<QPoint> & <i>points</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#QPolygon-5">QPolygon</a></b> ( const QRect & <i>rectangle</i>, bool <i>closed</i> = false )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#dtor.QPolygon">~QPolygon</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QRect </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#boundingRect">boundingRect</a></b> () const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#containsPoint">containsPoint</a></b> ( const QPoint & <i>point</i>, Qt::FillRule <i>fillRule</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPolygon </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#intersected">intersected</a></b> ( const QPolygon & <i>r</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#point">point</a></b> ( int <i>index</i>, int * <i>x</i>, int * <i>y</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPoint </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#point-2">point</a></b> ( int <i>index</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#putPoints">putPoints</a></b> ( int <i>index</i>, int <i>nPoints</i>, int <i>firstx</i>, int <i>firsty</i>, ... )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#putPoints-3">putPoints</a></b> ( int <i>index</i>, int <i>nPoints</i>, const QPolygon & <i>fromPolygon</i>, int <i>fromIndex</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#setPoint">setPoint</a></b> ( int <i>index</i>, int <i>x</i>, int <i>y</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#setPoint-2">setPoint</a></b> ( int <i>index</i>, const QPoint & <i>point</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#setPoints">setPoints</a></b> ( int <i>nPoints</i>, const int * <i>points</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#setPoints-2">setPoints</a></b> ( int <i>nPoints</i>, int <i>firstx</i>, int <i>firsty</i>, ... )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPolygon </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#subtracted">subtracted</a></b> ( const QPolygon & <i>r</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#translate">translate</a></b> ( int <i>dx</i>, int <i>dy</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#translate-2">translate</a></b> ( const QPoint & <i>offset</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPolygon </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#translated">translated</a></b> ( int <i>dx</i>, int <i>dy</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPolygon </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#translated-2">translated</a></b> ( const QPoint & <i>offset</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPolygon </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#united">united</a></b> ( const QPolygon & <i>r</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#operator-QVariant">operator QVariant</a></b> () const</td></tr>
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<ul>
<li><div bar="2" class="fn"></div>64 public functions inherited from <a href="qvector.html#public-functions">QVector</a></li>
</ul>
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<a name="related-non-members"></a>
<h2>Related Non-Members</h2>
<table class="alignedsummary" border="0" cellpadding="0" cellspacing="0" width="100%">
<tr><td class="memItemLeft" align="right" valign="top">QDataStream & </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#operator-lt-lt-118">operator<<</a></b> ( QDataStream & <i>stream</i>, const QPolygon & <i>polygon</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QDataStream & </td><td class="memItemRight" valign="bottom"><b><a href="qpolygon.html#operator-gt-gt-69">operator>></a></b> ( QDataStream & <i>stream</i>, QPolygon & <i>polygon</i> )</td></tr>
</table>
<h3>Additional Inherited Members</h3>
<ul>
<li><div class="fn"></div>2 static public members inherited from <a href="qvector.html#static-public-members">QVector</a></li>
</ul>
<a name="details"></a>
<hr />
<h2>Detailed Description</h2>
<p>The QPolygon class provides a vector of points using integer precision.</p>
<p>A QPolygon object is a <a href="qvector.html">QVector</a><<a href="qpoint.html">QPoint</a>>. The easiest way to add points to a QPolygon is to use <a href="qvector.html">QVector</a>'s streaming operator, as illustrated below:</p>
<pre> QPolygon polygon;
polygon << QPoint(10, 20) << QPoint(20, 30);</pre>
<p>In addition to the functions provided by <a href="qvector.html">QVector</a>, QPolygon provides some point-specific functions.</p>
<p>Each point in a polygon can be retrieved by passing its index to the <a href="qpolygon.html#point">point</a>() function. To populate the polygon, QPolygon provides the <a href="qpolygon.html#setPoint">setPoint</a>() function to set the point at a given index, the <a href="qpolygon.html#setPoints">setPoints</a>() function to set all the points in the polygon (resizing it to the given number of points), and the <a href="qpolygon.html#putPoints">putPoints</a>() function which copies a number of given points into the polygon from a specified index (resizing the polygon if necessary).</p>
<p>QPolygon provides the <a href="qpolygon.html#boundingRect">boundingRect</a>() and <a href="qpolygon.html#translate">translate</a>() functions for geometry functions. Use the <a href="qmatrix.html#map">QMatrix::map</a>() function for more general transformations of QPolygons.</p>
<p>The QPolygon class is <a href="implicit-sharing.html#implicit-data-sharing">implicitly shared</a>.</p>
<p>See also <a href="qvector.html">QVector</a>, <a href="qpolygonf.html">QPolygonF</a>, and <a href="qline.html">QLine</a>.</p>
<hr />
<h2>Member Function Documentation</h2>
<a name="//apple_ref/cpp/instm/QPolygon/QPolygon"></a>
<h3 class="fn"><a name="QPolygon"></a>QPolygon::QPolygon ()</h3>
<p>Constructs a polygon with no points.</p>
<p>See also <a href="qvector.html#isEmpty">QVector::isEmpty</a>().</p>
<h3 class="fn"><a name="QPolygon-2"></a>QPolygon::QPolygon ( int <i>size</i> )</h3>
<p>Constructs a polygon of the given <i>size</i>. Creates an empty polygon if <i>size</i> == 0.</p>
<p>See also <a href="qvector.html#isEmpty">QVector::isEmpty</a>().</p>
<h3 class="fn"><a name="QPolygon-3"></a>QPolygon::QPolygon ( const QPolygon & <i>polygon</i> )</h3>
<p>Constructs a copy of the given <i>polygon</i>.</p>
<p>See also <a href="qpolygon.html#setPoints">setPoints</a>().</p>
<h3 class="fn"><a name="QPolygon-4"></a>QPolygon::QPolygon ( const <a href="qvector.html">QVector</a><<a href="qpoint.html">QPoint</a>> & <i>points</i> )</h3>
<p>Constructs a polygon containing the specified <i>points</i>.</p>
<p>See also <a href="qpolygon.html#setPoints">setPoints</a>().</p>
<h3 class="fn"><a name="QPolygon-5"></a>QPolygon::QPolygon ( const <a href="qrect.html">QRect</a> & <i>rectangle</i>, bool <i>closed</i> = false )</h3>
<p>Constructs a polygon from the given <i>rectangle</i>. If <i>closed</i> is false, the polygon just contains the four points of the rectangle ordered clockwise, otherwise the polygon's fifth point is set to <i>rectangle</i>.topLeft().</p>
<p>Note that the bottom-right corner of the rectangle is located at (rectangle.x() + rectangle.width(), rectangle.y() + rectangle.height()).</p>
<p>See also <a href="qpolygon.html#setPoints">setPoints</a>().</p>
<a name="//apple_ref/cpp/instm/QPolygon/~QPolygon"></a>
<h3 class="fn"><a name="dtor.QPolygon"></a>QPolygon::~QPolygon ()</h3>
<p>Destroys the polygon.</p>
<a name="//apple_ref/cpp/instm/QPolygon/boundingRect"></a>
<h3 class="fn"><a name="boundingRect"></a><a href="qrect.html">QRect</a> QPolygon::boundingRect () const</h3>
<p>Returns the bounding rectangle of the polygon, or <a href="qrect.html">QRect</a>(0, 0, 0, 0) if the polygon is empty.</p>
<p>See also <a href="qvector.html#isEmpty">QVector::isEmpty</a>().</p>
<a name="//apple_ref/cpp/instm/QPolygon/containsPoint"></a>
<h3 class="fn"><a name="containsPoint"></a>bool QPolygon::containsPoint ( const <a href="qpoint.html">QPoint</a> & <i>point</i>, <a href="qt.html#FillRule-enum">Qt::FillRule</a> <i>fillRule</i> ) const</h3>
<p>Returns true if the given <i>point</i> is inside the polygon according to the specified <i>fillRule</i>; otherwise returns false.</p>
<p>This function was introduced in Qt 4.3.</p>
<a name="//apple_ref/cpp/instm/QPolygon/intersected"></a>
<h3 class="fn"><a name="intersected"></a>QPolygon QPolygon::intersected ( const QPolygon & <i>r</i> ) const</h3>
<p>Returns a polygon which is the intersection of this polygon and <i>r</i>.</p>
<p>Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.</p>
<p>This function was introduced in Qt 4.3.</p>
<a name="//apple_ref/cpp/instm/QPolygon/point"></a>
<h3 class="fn"><a name="point"></a>void QPolygon::point ( int <i>index</i>, int * <i>x</i>, int * <i>y</i> ) const</h3>
<p>Extracts the coordinates of the point at the given <i>index</i> to *<i>x</i> and *<i>y</i> (if they are valid pointers).</p>
<p>See also <a href="qpolygon.html#setPoint">setPoint</a>().</p>
<h3 class="fn"><a name="point-2"></a><a href="qpoint.html">QPoint</a> QPolygon::point ( int <i>index</i> ) const</h3>
<p>This is an overloaded function.</p>
<p>Returns the point at the given <i>index</i>.</p>
<a name="//apple_ref/cpp/instm/QPolygon/putPoints"></a>
<h3 class="fn"><a name="putPoints"></a>void QPolygon::putPoints ( int <i>index</i>, int <i>nPoints</i>, int <i>firstx</i>, int <i>firsty</i>, ... )</h3>
<p>Copies <i>nPoints</i> points from the variable argument list into this polygon from the given <i>index</i>.</p>
<p>The points are given as a sequence of integers, starting with <i>firstx</i> then <i>firsty</i>, and so on. The polygon is resized if <tt>index+nPoints</tt> exceeds its current size.</p>
<p>The example code creates a polygon with three points (4,5), (6,7) and (8,9), by expanding the polygon from 1 to 3 points:</p>
<pre> QPolygon polygon(1);
polygon[0] = QPoint(4, 5);
polygon.putPoints(1, 2, 6,7, 8,9);</pre>
<p>The following code has the same result, but here the putPoints() function overwrites rather than extends:</p>
<pre> QPolygon polygon(3);
polygon.putPoints(0, 3, 4,5, 0,0, 8,9);
polygon.putPoints(1, 1, 6,7);</pre>
<p>See also <a href="qpolygon.html#setPoints">setPoints</a>().</p>
<h3 class="fn"><a name="putPoints-3"></a>void QPolygon::putPoints ( int <i>index</i>, int <i>nPoints</i>, const QPolygon & <i>fromPolygon</i>, int <i>fromIndex</i> = 0 )</h3>
<p>This is an overloaded function.</p>
<p>Copies <i>nPoints</i> points from the given <i>fromIndex</i> ( 0 by default) in <i>fromPolygon</i> into this polygon, starting at the specified <i>index</i>. For example:</p>
<pre> QPolygon polygon1;
polygon1.putPoints(0, 3, 1,2, 0,0, 5,6);
<span class="comment">// polygon1 is now the three-point polygon(1,2, 0,0, 5,6);</span>
QPolygon polygon2;
polygon2.putPoints(0, 3, 4,4, 5,5, 6,6);
<span class="comment">// polygon2 is now (4,4, 5,5, 6,6);</span>
polygon1.putPoints(2, 3, polygon2);
<span class="comment">// polygon1 is now the five-point polygon(1,2, 0,0, 4,4, 5,5, 6,6);</span></pre>
<a name="//apple_ref/cpp/instm/QPolygon/setPoint"></a>
<h3 class="fn"><a name="setPoint"></a>void QPolygon::setPoint ( int <i>index</i>, int <i>x</i>, int <i>y</i> )</h3>
<p>Sets the point at the given <i>index</i> to the point specified by (<i>x</i>, <i>y</i>).</p>
<p>See also <a href="qpolygon.html#point">point</a>(), <a href="qpolygon.html#putPoints">putPoints</a>(), and <a href="qpolygon.html#setPoints">setPoints</a>().</p>
<h3 class="fn"><a name="setPoint-2"></a>void QPolygon::setPoint ( int <i>index</i>, const <a href="qpoint.html">QPoint</a> & <i>point</i> )</h3>
<p>This is an overloaded function.</p>
<p>Sets the point at the given <i>index</i> to the given <i>point</i>.</p>
<a name="//apple_ref/cpp/instm/QPolygon/setPoints"></a>
<h3 class="fn"><a name="setPoints"></a>void QPolygon::setPoints ( int <i>nPoints</i>, const int * <i>points</i> )</h3>
<p>Resizes the polygon to <i>nPoints</i> and populates it with the given <i>points</i>.</p>
<p>The example code creates a polygon with two points (10, 20) and (30, 40):</p>
<pre> static const int points[] = { 10, 20, 30, 40 };
QPolygon polygon;
polygon.setPoints(2, points);</pre>
<p>See also <a href="qpolygon.html#setPoint">setPoint</a>() and <a href="qpolygon.html#putPoints">putPoints</a>().</p>
<h3 class="fn"><a name="setPoints-2"></a>void QPolygon::setPoints ( int <i>nPoints</i>, int <i>firstx</i>, int <i>firsty</i>, ... )</h3>
<p>This is an overloaded function.</p>
<p>Resizes the polygon to <i>nPoints</i> and populates it with the points specified by the variable argument list. The points are given as a sequence of integers, starting with <i>firstx</i> then <i>firsty</i>, and so on.</p>
<p>The example code creates a polygon with two points (10, 20) and (30, 40):</p>
<pre> QPolygon polygon;
polygon.setPoints(2, 10, 20, 30, 40);</pre>
<a name="//apple_ref/cpp/instm/QPolygon/subtracted"></a>
<h3 class="fn"><a name="subtracted"></a>QPolygon QPolygon::subtracted ( const QPolygon & <i>r</i> ) const</h3>
<p>Returns a polygon which is <i>r</i> subtracted from this polygon.</p>
<p>Set operations on polygons will treat the polygons as areas. Non-closed polygons will be treated as implicitly closed.</p>
<p>This function was introduced in Qt 4.3.</p>
<a name="//apple_ref/cpp/instm/QPolygon/translate"></a>
<h3 class="fn"><a name="translate"></a>void QPolygon::translate ( int <i>dx</i>, int <i>dy</i> )</h3>
<p>Translates all points in the polygon by (<i>dx</i>, <i>dy</i>).</p>
<p>See also <a href="qpolygon.html#translated">translated</a>().</p>
<h3 class="fn"><a name="translate-2"></a>void QPolygon::translate ( const <a href="qpoint.html">QPoint</a> & <i>offset</i> )</h3>
<p>This is an overloaded function.</p>
<p>Translates all points in the polygon by the given <i>offset</i>.</p>
<p>See also <a href="qpolygon.html#translated">translated</a>().</p>
<a name="//apple_ref/cpp/instm/QPolygon/translated"></a>
<h3 class="fn"><a name="translated"></a>QPolygon QPolygon::translated ( int <i>dx</i>, int <i>dy</i> ) const</h3>
<p>Returns a copy of the polygon that is translated by (<i>dx</i>, <i>dy</i>).</p>
<p>This function was introduced in Qt 4.6.</p>
<p>See also <a href="qpolygon.html#translate">translate</a>().</p>
<h3 class="fn"><a name="translated-2"></a>QPolygon QPolygon::translated ( const <a href="qpoint.html">QPoint</a> & <i>offset</i> ) const</h3>
<p>This is an overloaded function.</p>
<p>Returns a copy of the polygon that is translated by the given <i>offset</i>.</p>
<p>This function was introduced in Qt 4.6.</p>
<p>See also <a href="qpolygon.html#translate">translate</a>().</p>
<a name="//apple_ref/cpp/instm/QPolygon/united"></a>
<h3 class="fn"><a name="united"></a>QPolygon QPolygon::united ( const QPolygon & <i>r</i> ) const</h3>
<p>Returns a polygon which is the union of this polygon and <i>r</i>.</p>
<p>Set operations on polygons, will treat the polygons as areas, and implicitly close the polygon.</p>
<p>This function was introduced in Qt 4.3.</p>
<p>See also <a href="qpolygon.html#intersected">intersected</a>() and <a href="qpolygon.html#subtracted">subtracted</a>().</p>
<a name="//apple_ref/cpp/instm/QPolygon/operator QVariant"></a>
<h3 class="fn"><a name="operator-QVariant"></a>QPolygon::operator QVariant () const</h3>
<p>Returns the polygon as a <a href="qvariant.html">QVariant</a></p>
<hr />
<h2>Related Non-Members</h2>
<h3 class="fn"><a name="operator-lt-lt-118"></a><a href="qdatastream.html">QDataStream</a> & operator<< ( <a href="qdatastream.html">QDataStream</a> & <i>stream</i>, const QPolygon & <i>polygon</i> )</h3>
<p>Writes the given <i>polygon</i> to the given <i>stream</i>, and returns a reference to the stream.</p>
<p>This function was introduced in Qt 4.4.</p>
<p>See also <a href="datastreamformat.html">Format of the QDataStream Operators</a>.</p>
<h3 class="fn"><a name="operator-gt-gt-69"></a><a href="qdatastream.html">QDataStream</a> & operator>> ( <a href="qdatastream.html">QDataStream</a> & <i>stream</i>, QPolygon & <i>polygon</i> )</h3>
<p>Reads a polygon from the given <i>stream</i> into the given <i>polygon</i>, and returns a reference to the stream.</p>
<p>This function was introduced in Qt 4.4.</p>
<p>See also <a href="datastreamformat.html">Format of the QDataStream Operators</a>.</p>
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