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<li class="level1"><a href="#public-functions">Public Functions</a></li>
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<h1 class="title">QPicture Class Reference</h1>
<!-- $$$QPicture-brief -->
<p>The QPicture class is a paint device that records and replays <a href="qpainter.html">QPainter</a> commands. <a href="#details">More...</a></p>
<!-- @@@QPicture -->
<pre class="cpp"> <span class="preprocessor">#include <QPicture></span></pre><p><b>Inherits: </b><a href="qpaintdevice.html">QPaintDevice</a>.</p>
<p><b>Inherited by: </b><a href="q3picture.html" class="compat">Q3Picture</a>.</p>
<ul>
<li><a href="qpicture-members.html">List of all members, including inherited members</a></li>
<li><a href="qpicture-obsolete.html">Obsolete members</a></li>
<li><a href="qpicture-qt3.html">Qt 3 support members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#QPicture">QPicture</a></b> ( int <i>formatVersion</i> = -1 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#QPicture-2">QPicture</a></b> ( const QPicture & <i>pic</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#dtor.QPicture">~QPicture</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QRect </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#boundingRect">boundingRect</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const char * </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#data">data</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#isNull">isNull</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#load">load</a></b> ( const QString & <i>fileName</i>, const char * <i>format</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#load-2">load</a></b> ( QIODevice * <i>dev</i>, const char * <i>format</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#play">play</a></b> ( QPainter * <i>painter</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#save">save</a></b> ( const QString & <i>fileName</i>, const char * <i>format</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#save-2">save</a></b> ( QIODevice * <i>dev</i>, const char * <i>format</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#setBoundingRect">setBoundingRect</a></b> ( const QRect & <i>r</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#setData">setData</a></b> ( const char * <i>data</i>, uint <i>size</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> uint </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#size">size</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#swap">swap</a></b> ( QPicture & <i>other</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPicture & </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#operator-eq">operator=</a></b> ( const QPicture & <i>p</i> )</td></tr>
</table>
<ul>
<li class="fn">13 public functions inherited from <a href="qpaintdevice.html#public-functions">QPaintDevice</a></li>
</ul>
<a name="related-non-members"></a>
<h2>Related Non-Members</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> QDataStream & </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#operator-lt-lt-205">operator<<</a></b> ( QDataStream & <i>s</i>, const QPicture & <i>r</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QDataStream & </td><td class="memItemRight bottomAlign"><b><a href="qpicture.html#operator-gt-gt-112">operator>></a></b> ( QDataStream & <i>s</i>, QPicture & <i>r</i> )</td></tr>
</table>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 protected function inherited from <a href="qpaintdevice.html#protected-functions">QPaintDevice</a></li>
</ul>
<a name="details"></a>
<!-- $$$QPicture-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QPicture class is a paint device that records and replays <a href="qpainter.html">QPainter</a> commands.</p>
<p>A picture serializes painter commands to an IO device in a platform-independent format. They are sometimes referred to as meta-files.</p>
<p>Qt pictures use a proprietary binary format. Unlike native picture (meta-file) formats on many window systems, Qt pictures have no limitations regarding their contents. Everything that can be painted on a widget or pixmap (e.g., fonts, pixmaps, regions, transformed graphics, etc.) can also be stored in a picture.</p>
<p>QPicture is resolution independent, i.e. a QPicture can be displayed on different devices (for example svg, pdf, ps, printer and screen) looking the same. This is, for instance, needed for WYSIWYG print preview. QPicture runs in the default system dpi, and scales the painter to match differences in resolution depending on the window system.</p>
<p>Example of how to record a picture:</p>
<pre class="cpp"> <span class="type">QPicture</span> picture;
<span class="type"><a href="qpainter.html">QPainter</a></span> painter;
painter<span class="operator">.</span>begin(<span class="operator">&</span>picture); <span class="comment">// paint in picture</span>
painter<span class="operator">.</span>drawEllipse(<span class="number">10</span><span class="operator">,</span><span class="number">20</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span><span class="number">70</span>); <span class="comment">// draw an ellipse</span>
painter<span class="operator">.</span>end(); <span class="comment">// painting done</span>
picture<span class="operator">.</span>save(<span class="string">"drawing.pic"</span>); <span class="comment">// save picture</span></pre>
<p>Note that the list of painter commands is reset on each call to the <a href="qpainter.html#begin">QPainter::begin</a>() function.</p>
<p>Example of how to replay a picture:</p>
<pre class="cpp"> <span class="type">QPicture</span> picture;
picture<span class="operator">.</span>load(<span class="string">"drawing.pic"</span>); <span class="comment">// load picture</span>
<span class="type"><a href="qpainter.html">QPainter</a></span> painter;
painter<span class="operator">.</span>begin(<span class="operator">&</span>myImage); <span class="comment">// paint in myImage</span>
painter<span class="operator">.</span>drawPicture(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> picture); <span class="comment">// draw the picture at (0,0)</span>
painter<span class="operator">.</span>end(); <span class="comment">// painting done</span></pre>
<p>Pictures can also be drawn using <a href="qpicture.html#play">play</a>(). Some basic data about a picture is available, for example, <a href="qpicture.html#size">size</a>(), <a href="qpicture.html#isNull">isNull</a>() and <a href="qpicture.html#boundingRect">boundingRect</a>().</p>
</div>
<p><b>See also </b><a href="qmovie.html">QMovie</a>.</p>
<!-- @@@QPicture -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QPicture[overload1]$$$QPictureint -->
<h3 class="fn"><a name="QPicture"></a>QPicture::<span class="name">QPicture</span> ( <span class="type">int</span> <i>formatVersion</i> = -1 )</h3>
<p>Constructs an empty picture.</p>
<p>The <i>formatVersion</i> parameter may be used to <i>create</i> a <a href="qpicture.html">QPicture</a> that can be read by applications that are compiled with earlier versions of Qt.</p>
<p>Note that the default formatVersion is -1 which signifies the current release, i.e. for Qt 4.0 a formatVersion of 7 is the same as the default formatVersion of -1.</p>
<p>Reading pictures generated by earlier versions of Qt is not supported in Qt 4.0.</p>
<!-- @@@QPicture -->
<!-- $$$QPicture$$$QPictureconstQPicture& -->
<h3 class="fn"><a name="QPicture-2"></a>QPicture::<span class="name">QPicture</span> ( const <span class="type">QPicture</span> & <i>pic</i> )</h3>
<p>Constructs a copy of <i>pic</i>.</p>
<p>This constructor is fast thanks to <a href="implicit-sharing.html">implicit sharing</a>.</p>
<!-- @@@QPicture -->
<!-- $$$~QPicture[overload1]$$$~QPicture -->
<h3 class="fn"><a name="dtor.QPicture"></a>QPicture::<span class="name">~QPicture</span> ()</h3>
<p>Destroys the picture.</p>
<!-- @@@~QPicture -->
<!-- $$$boundingRect[overload1]$$$boundingRect -->
<h3 class="fn"><a name="boundingRect"></a><span class="type"><a href="qrect.html">QRect</a></span> QPicture::<span class="name">boundingRect</span> () const</h3>
<p>Returns the picture's bounding rectangle or an invalid rectangle if the picture contains no data.</p>
<p><b>See also </b><a href="qpicture.html#setBoundingRect">setBoundingRect</a>().</p>
<!-- @@@boundingRect -->
<!-- $$$data[overload1]$$$data -->
<h3 class="fn"><a name="data"></a>const <span class="type">char</span> * QPicture::<span class="name">data</span> () const</h3>
<p>Returns a pointer to the picture data. The pointer is only valid until the next non-const function is called on this picture. The returned pointer is 0 if the picture contains no data.</p>
<p><b>See also </b><a href="qpicture.html#setData">setData</a>(), <a href="qpicture.html#size">size</a>(), and <a href="qpicture.html#isNull">isNull</a>().</p>
<!-- @@@data -->
<!-- $$$isNull[overload1]$$$isNull -->
<h3 class="fn"><a name="isNull"></a><span class="type">bool</span> QPicture::<span class="name">isNull</span> () const</h3>
<p>Returns true if the picture contains no data; otherwise returns false.</p>
<!-- @@@isNull -->
<!-- $$$load[overload1]$$$loadconstQString&constchar* -->
<h3 class="fn"><a name="load"></a><span class="type">bool</span> QPicture::<span class="name">load</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>fileName</i>, const <span class="type">char</span> * <i>format</i> = 0 )</h3>
<p>Loads a picture from the file specified by <i>fileName</i> and returns true if successful; otherwise returns false.</p>
<p>Please note that the <i>format</i> parameter has been deprecated and will have no effect.</p>
<p><b>See also </b><a href="qpicture.html#save">save</a>().</p>
<!-- @@@load -->
<!-- $$$load$$$loadQIODevice*constchar* -->
<h3 class="fn"><a name="load-2"></a><span class="type">bool</span> QPicture::<span class="name">load</span> ( <span class="type"><a href="qiodevice.html">QIODevice</a></span> * <i>dev</i>, const <span class="type">char</span> * <i>format</i> = 0 )</h3>
<p>This is an overloaded function.</p>
<p><i>dev</i> is the device to use for loading.</p>
<!-- @@@load -->
<!-- $$$play[overload1]$$$playQPainter* -->
<h3 class="fn"><a name="play"></a><span class="type">bool</span> QPicture::<span class="name">play</span> ( <span class="type"><a href="qpainter.html">QPainter</a></span> * <i>painter</i> )</h3>
<p>Replays the picture using <i>painter</i>, and returns true if successful; otherwise returns false.</p>
<p>This function does exactly the same as <a href="qpainter.html#drawPicture">QPainter::drawPicture</a>() with (x, y) = (0, 0).</p>
<!-- @@@play -->
<!-- $$$save[overload1]$$$saveconstQString&constchar* -->
<h3 class="fn"><a name="save"></a><span class="type">bool</span> QPicture::<span class="name">save</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>fileName</i>, const <span class="type">char</span> * <i>format</i> = 0 )</h3>
<p>Saves a picture to the file specified by <i>fileName</i> and returns true if successful; otherwise returns false.</p>
<p>Please note that the <i>format</i> parameter has been deprecated and will have no effect.</p>
<p><b>See also </b><a href="qpicture.html#load">load</a>().</p>
<!-- @@@save -->
<!-- $$$save$$$saveQIODevice*constchar* -->
<h3 class="fn"><a name="save-2"></a><span class="type">bool</span> QPicture::<span class="name">save</span> ( <span class="type"><a href="qiodevice.html">QIODevice</a></span> * <i>dev</i>, const <span class="type">char</span> * <i>format</i> = 0 )</h3>
<p>This is an overloaded function.</p>
<p><i>dev</i> is the device to use for saving.</p>
<!-- @@@save -->
<!-- $$$setBoundingRect[overload1]$$$setBoundingRectconstQRect& -->
<h3 class="fn"><a name="setBoundingRect"></a><span class="type">void</span> QPicture::<span class="name">setBoundingRect</span> ( const <span class="type"><a href="qrect.html">QRect</a></span> & <i>r</i> )</h3>
<p>Sets the picture's bounding rectangle to <i>r</i>. The automatically calculated value is overridden.</p>
<p><b>See also </b><a href="qpicture.html#boundingRect">boundingRect</a>().</p>
<!-- @@@setBoundingRect -->
<!-- $$$setData[overload1]$$$setDataconstchar*uint -->
<h3 class="fn"><a name="setData"></a><span class="type">void</span> QPicture::<span class="name">setData</span> ( const <span class="type">char</span> * <i>data</i>, <span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> <i>size</i> )<tt> [virtual]</tt></h3>
<p>Sets the picture data directly from <i>data</i> and <i>size</i>. This function copies the input data.</p>
<p><b>See also </b><a href="qpicture.html#data">data</a>() and <a href="qpicture.html#size">size</a>().</p>
<!-- @@@setData -->
<!-- $$$size[overload1]$$$size -->
<h3 class="fn"><a name="size"></a><span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> QPicture::<span class="name">size</span> () const</h3>
<p>Returns the size of the picture data.</p>
<p><b>See also </b><a href="qpicture.html#data">data</a>().</p>
<!-- @@@size -->
<!-- $$$swap[overload1]$$$swapQPicture& -->
<h3 class="fn"><a name="swap"></a><span class="type">void</span> QPicture::<span class="name">swap</span> ( <span class="type">QPicture</span> & <i>other</i> )</h3>
<p>Swaps picture <i>other</i> with this picture. This operation is very fast and never fails.</p>
<p>This function was introduced in Qt 4.8.</p>
<!-- @@@swap -->
<!-- $$$operator=[overload1]$$$operator=constQPicture& -->
<h3 class="fn"><a name="operator-eq"></a><span class="type">QPicture</span> & QPicture::<span class="name">operator=</span> ( const <span class="type">QPicture</span> & <i>p</i> )</h3>
<p>Assigns picture <i>p</i> to this picture and returns a reference to this picture.</p>
<!-- @@@operator= -->
</div>
<div class="relnonmem">
<h2>Related Non-Members</h2>
<!-- $$$operator<<$$$operator<<QDataStream&constQPicture& -->
<h3 class="fn"><a name="operator-lt-lt-205"></a><span class="type"><a href="qdatastream.html">QDataStream</a></span> & <span class="name">operator<<</span> ( <span class="type"><a href="qdatastream.html">QDataStream</a></span> & <i>s</i>, const <span class="type">QPicture</span> & <i>r</i> )</h3>
<p>Writes picture <i>r</i> to the stream <i>s</i> and returns a reference to the stream.</p>
<!-- @@@operator<< -->
<!-- $$$operator>>$$$operator>>QDataStream&QPicture& -->
<h3 class="fn"><a name="operator-gt-gt-112"></a><span class="type"><a href="qdatastream.html">QDataStream</a></span> & <span class="name">operator>></span> ( <span class="type"><a href="qdatastream.html">QDataStream</a></span> & <i>s</i>, <span class="type">QPicture</span> & <i>r</i> )</h3>
<p>Reads a picture from the stream <i>s</i> into picture <i>r</i> and returns a reference to the stream.</p>
<!-- @@@operator>> -->
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