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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/qpicture.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
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| -rw-r--r-- | doc/html/qpicture.html | 270 |
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diff --git a/doc/html/qpicture.html b/doc/html/qpicture.html new file mode 100644 index 0000000..8fade7b --- /dev/null +++ b/doc/html/qpicture.html @@ -0,0 +1,270 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/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"><!-- +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 and +replays 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 class=fn><a href="#QPicture"><b>QPicture</b></a> ( int formatVersion = -1 )</li> +<li class=fn><a href="#QPicture-2"><b>QPicture</b></a> ( const QPicture & pic )</li> +<li class=fn><a href="#~QPicture"><b>~QPicture</b></a> ()</li> +<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li> +<li class=fn>uint <a href="#size"><b>size</b></a> () const</li> +<li class=fn>const char * <a href="#data"><b>data</b></a> () const</li> +<li class=fn>virtual void <a href="#setData"><b>setData</b></a> ( const char * data, uint size )</li> +<li class=fn>bool <a href="#play"><b>play</b></a> ( QPainter * painter )</li> +<li class=fn>bool <a href="#load-2"><b>load</b></a> ( QIODevice * dev, const char * format = 0 )</li> +<li class=fn>bool <a href="#load"><b>load</b></a> ( const QString & fileName, const char * format = 0 )</li> +<li class=fn>bool <a href="#save-2"><b>save</b></a> ( QIODevice * dev, const char * format = 0 )</li> +<li class=fn>bool <a href="#save"><b>save</b></a> ( const QString & fileName, const char * format = 0 )</li> +<li class=fn>QRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li> +<li class=fn>void <a href="#setBoundingRect"><b>setBoundingRect</b></a> ( const QRect & r )</li> +<li class=fn>QPicture & <a href="#operator-eq"><b>operator=</b></a> ( const QPicture & p )</li> +</ul> +<h2>Protected Members</h2> +<ul> +<li class=fn>virtual int <a href="#metric"><b>metric</b></a> ( int m ) const</li> +<li class=fn>void <a href="#detach"><b>detach</b></a> ()</li> +<li class=fn>QPicture <a href="#copy"><b>copy</b></a> () const</li> +</ul> +<h2>Related Functions</h2> +<ul> +<li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QPicture & r )</li> +<li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QPicture & r )</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +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. For example, a picture created under +Windows 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 no +limitations regarding their contents. Everything that can be +painted 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 a +picture 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 QPicture +that can be read by applications that are compiled with earlier +versions 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 3.0.x and later. +<li> <em>formatVersion</em> == 5 is binary compatible with Qt 3.1. +</ul> +<p> Note that the default formatVersion is -1 which signifies the +current release, i.e. for Qt 3.1 a formatVersion of 5 is the same +as the default formatVersion of -1. +<p> Reading pictures generated by earlier versions of Qt is supported +and 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 rectangle +if 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 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>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 picture +is the only one referring to the data. +<p> If multiple pictures share common data, this picture makes a copy +of 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 returns +FALSE. + +<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 returns +TRUE if successful; otherwise returns FALSE. +<p> By default, the file will be interpreted as being in the native +QPicture format. Specifying the <em>format</em> string is optional and +is only needed for importing picture data stored in a different +format. +<p> Currently, the only external format supported is the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG</a> format which +requires the <a href="xml.html">Qt XML module</a>. The +corresponding <em>format</em> string is "svg". +<p> <p>See also <a href="#save">save</a>(). + +<p>Examples: <a href="picture-example.html#x122">picture/picture.cpp</a> and <a href="xform-example.html#x1244">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 this +picture 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 if +successful; 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 returns +TRUE if successful; otherwise returns FALSE. +<p> Specifying the file <em>format</em> string is optional. It's not +recommended unless you intend to export the picture data for +use by a third party reader. By default the data will be saved in +the 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 which +requires the <a href="xml.html">Qt XML module</a>. The +corresponding <em>format</em> string is "svg". +<p> <p>See also <a href="#load">load</a>(). + +<p>Example: <a href="picture-example.html#x123">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="setBoundingRect"></a>QPicture::setBoundingRect ( const <a href="qrect.html">QRect</a> & r ) +</h3> +Sets the picture's bounding rectangle to <em>r</em>. The automatically +calculated value is overriden. + +<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>. This +function 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 to +the 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 returns +a reference to the stream. + +<!-- 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>. 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