qpicture.html
来自「QT 下载资料仅供参考」· HTML 代码 · 共 264 行
HTML
264 行
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/kernel/qpicture.cpp:53 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QPicture Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td 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><td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QPicture Class Reference</h1><p>The QPicture class is a paint device that records andreplays QPainter commands.<a href="#details">More...</a><p><tt>#include <<a href="qpicture-h.html">qpicture.h</a>></tt><p>Inherits <a href="qpaintdevice.html">QPaintDevice</a>.<p><a href="qpicture-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn><a href="#QPicture"><b>QPicture</b></a> ( int formatVersion = -1 )</div></li><li><div class=fn><a href="#QPicture-2"><b>QPicture</b></a> ( const QPicture & pic )</div></li><li><div class=fn><a href="#~QPicture"><b>~QPicture</b></a> ()</div></li><li><div class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</div></li><li><div class=fn>uint <a href="#size"><b>size</b></a> () const</div></li><li><div class=fn>const char * <a href="#data"><b>data</b></a> () const</div></li><li><div class=fn>virtual void <a href="#setData"><b>setData</b></a> ( const char * data, uint size )</div></li><li><div class=fn>bool <a href="#play"><b>play</b></a> ( QPainter * painter )</div></li><li><div class=fn>bool <a href="#load-2"><b>load</b></a> ( QIODevice * dev, const char * format = 0 )</div></li><li><div class=fn>bool <a href="#load"><b>load</b></a> ( const QString & fileName, const char * format = 0 )</div></li><li><div class=fn>bool <a href="#save-2"><b>save</b></a> ( QIODevice * dev, const char * format = 0 )</div></li><li><div class=fn>bool <a href="#save"><b>save</b></a> ( const QString & fileName, const char * format = 0 )</div></li><li><div class=fn>QRect <a href="#boundingRect"><b>boundingRect</b></a> () const</div></li><li><div class=fn>QPicture & <a href="#operator-eq"><b>operator=</b></a> ( const QPicture & p )</div></li></ul><h2>Protected Members</h2><ul><li><div class=fn>virtual int <a href="#metric"><b>metric</b></a> ( int m ) const</div></li><li><div class=fn>void <a href="#detach"><b>detach</b></a> ()</div></li><li><div class=fn>QPicture <a href="#copy"><b>copy</b></a> () const</div></li></ul><h2>Related Functions</h2><ul><li><div class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QPicture & r )</div></li><li><div class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QPicture & r )</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2>The QPicture class is a paint device that records andreplays <a href="qpainter.html">QPainter</a> commands.<p> <p> A picture serializes painter commands to an IO device in aplatform-independent format. For example, a picture created underWindows can be read on a Sun SPARC.<p> Pictures are called meta-files on some platforms.<p> Qt pictures use a proprietary binary format. Unlike native picture(meta-file) formats on many window systems, Qt pictures have nolimitations regarding their contents. Everything that can bepainted can also be stored in a picture, e.g. fonts, pixmaps,regions, transformed graphics, etc.<p> QPicture is an <a href="shclass.html">implicitly shared</a> class.<p> Example of how to record a picture:<pre> QPicture pic; <a href="qpainter.html">QPainter</a> p; p.<a href="qpainter.html#begin">begin</a>( &pic ); // paint in picture p.<a href="qpainter.html#drawEllipse">drawEllipse</a>( 10,20, 80,70 ); // draw an ellipse p.<a href="qpainter.html#end">end</a>(); // painting done pic.<a href="#save">save</a>( "drawing.pic" ); // save picture </pre> <p> Example of how to replay a picture:<pre> QPicture pic; pic.<a href="#load">load</a>( "drawing.pic" ); // load picture <a href="qpainter.html">QPainter</a> p; p.<a href="qpainter.html#begin">begin</a>( &myWidget ); // paint in myWidget p.<a href="qpainter.html#drawPicture">drawPicture</a>( pic ); // draw the picture p.<a href="qpainter.html#end">end</a>(); // painting done </pre> <p> Pictures can also be drawn using <a href="#play">play</a>(). Some basic data about apicture is available, for example, <a href="#size">size</a>(), <a href="#isNull">isNull</a>() and<a href="#boundingRect">boundingRect</a>().<p> <p>See also <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a> and <a href="shared.html">Implicitly and Explicitly Shared Classes</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QPicture"></a>QPicture::QPicture ( int formatVersion = -1 )</h3>Constructs an empty picture.<p> The <em>formatVersion</em> parameter may be used to <em>create</em> a QPicturethat can be read by applications that are compiled with earlierversions of Qt.<ul><li> <em>formatVersion</em> == 1 is binary compatible with Qt 1.x and later.<li> <em>formatVersion</em> == 2 is binary compatible with Qt 2.0.x and later.<li> <em>formatVersion</em> == 3 is binary compatible with Qt 2.1.x and later.<li> <em>formatVersion</em> == 4 is binary compatible with Qt 3.x.</ul><p> Note that the default formatVersion is -1 which signifies thecurrent release, i.e. for Qt 3.0 a formatVersion of 4 is the sameas the default formatVersion of -1.<p> Reading pictures generated by earlier versions of Qt is supportedand needs no special coding; the format is automatically detected.<h3 class=fn><a name="QPicture-2"></a>QPicture::QPicture ( const <a href="qpicture.html">QPicture</a> & pic )</h3>Constructs a <a href="shclass.html">shallow copy</a> of <em>pic</em>.<h3 class=fn><a name="~QPicture"></a>QPicture::~QPicture ()</h3>Destroys the picture.<h3 class=fn><a href="qrect.html">QRect</a> <a name="boundingRect"></a>QPicture::boundingRect () const</h3>Returns the picture's bounding rectangle or an invalid rectangleif the picture contains no data.<h3 class=fn><a href="qpicture.html">QPicture</a> <a name="copy"></a>QPicture::copy () const<tt> [protected]</tt></h3>Returns a <a href="shclass.html">deep copy</a> of the picture.<h3 class=fn>const char * <a name="data"></a>QPicture::data () const</h3><p> Returns a pointer to the picture data. The pointer is only validuntil the next non-const function is called on this picture. Thereturned pointer is 0 if the picture contains no data.<p> <p>See also <a href="#size">size</a>() and <a href="#isNull">isNull</a>().<h3 class=fn>void <a name="detach"></a>QPicture::detach ()<tt> [protected]</tt></h3>Detaches from shared picture data and makes sure that this pictureis the only one referring to the data.<p> If multiple pictures share common data, this picture makes a copyof the data and detaches itself from the sharing mechanism.Nothing is done if there is just a single reference.<h3 class=fn>bool <a name="isNull"></a>QPicture::isNull () const</h3><p> Returns TRUE if the picture contains no data; otherwise returnsFALSE.<h3 class=fn>bool <a name="load"></a>QPicture::load ( const <a href="qstring.html">QString</a> & fileName, const char * format = 0 )</h3>Loads a picture from the file specified by <em>fileName</em> and returnsTRUE if successful; otherwise returns FALSE.<p> By default, the file will be interpreted as being in the nativeQPicture format. Specifying the <em>format</em> string is optional andis only needed for importing picture data stored in a differentformat.<p> Currently, the only external format supported is the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG</a> format whichrequires the <a href="xml.html">Qt XML module</a>. Thecorresponding <em>format</em> string is "svg".<p> <p>See also <a href="#save">save</a>().<p>Examples: <a href="picture-example.html#x90">picture/picture.cpp</a> and <a href="xform-example.html#x1443">xform/xform.cpp</a>.<h3 class=fn>bool <a name="load-2"></a>QPicture::load ( <a href="qiodevice.html">QIODevice</a> * dev, const char * format = 0 )</h3>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.<p> <em>dev</em> is the device to use for loading.<h3 class=fn>int <a name="metric"></a>QPicture::metric ( int m ) const<tt> [virtual protected]</tt></h3>Internal implementation of the virtual QPaintDevice::metric()function.<p> Use the <a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> class instead.<p> A picture has the following hard-coded values: dpi=72,numcolors=16777216 and depth=24.<p> <em>m</em> is the metric to get.<h3 class=fn><a href="qpicture.html">QPicture</a> & <a name="operator-eq"></a>QPicture::operator= ( const <a href="qpicture.html">QPicture</a> & p )</h3>Assigns a <a href="shclass.html">shallow copy</a> of <em>p</em> to thispicture and returns a reference to this picture.<h3 class=fn>bool <a name="play"></a>QPicture::play ( <a href="qpainter.html">QPainter</a> * painter )</h3>Replays the picture using <em>painter</em>, and returns TRUE ifsuccessful; otherwise returns FALSE.<p> This function does exactly the same as <a href="qpainter.html#drawPicture">QPainter::drawPicture</a>()with (x, y) = (0, 0).<h3 class=fn>bool <a name="save"></a>QPicture::save ( const <a href="qstring.html">QString</a> & fileName, const char * format = 0 )</h3>Saves a picture to the file specified by <em>fileName</em> and returnsTRUE if successful; otherwise returns FALSE.<p> Specifying the file <em>format</em> string is optional. It's notrecommended unless you intend to export the picture data foruse by a third party reader. By default the data will be saved inthe native QPicture file format.<p> Currently, the only external format supported is the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG</a> format whichrequires the <a href="xml.html">Qt XML module</a>. Thecorresponding <em>format</em> string is "svg".<p> <p>See also <a href="#load">load</a>().<p>Example: <a href="picture-example.html#x91">picture/picture.cpp</a>.<h3 class=fn>bool <a name="save-2"></a>QPicture::save ( <a href="qiodevice.html">QIODevice</a> * dev, const char * format = 0 )</h3>This is an overloaded member function, provided for convenience. It behaves essentially like the above function.<p> <em>dev</em> is the device to use for saving.<h3 class=fn>void <a name="setData"></a>QPicture::setData ( const char * data, uint size )<tt> [virtual]</tt></h3>Sets the picture data directly from <em>data</em> and <em>size</em>. Thisfunction copies the input data.<p> <p>See also <a href="#data">data</a>() and <a href="#size">size</a>().<h3 class=fn>uint <a name="size"></a>QPicture::size () const</h3><p> Returns the size of the picture data.<p> <p>See also <a href="#data">data</a>().<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="qpicture.html">QPicture</a> & r )</h3><p> Writes picture, <em>r</em> to the stream <em>s</em> and returns a reference tothe stream.<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="qpicture.html">QPicture</a> & r )</h3><p> Reads a picture from the stream <em>s</em> into picture <em>r</em> and returnsa reference to the stream.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<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 © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?