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271 lines
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271 lines
14 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qpicture.cpp:53 -->
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<title>TQPicture Class</title>
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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>TQPicture Class Reference</h1>
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<p>The TQPicture class is a paint device that records and
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replays TQPainter commands.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qpicture-h.html">ntqpicture.h</a>></tt>
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<p>Inherits <a href="ntqpaintdevice.html">TQPaintDevice</a>.
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<p><a href="qpicture-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><a href="#TQPicture"><b>TQPicture</b></a> ( int formatVersion = -1 )</li>
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<li class=fn><a href="#TQPicture-2"><b>TQPicture</b></a> ( const TQPicture & pic )</li>
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<li class=fn><a href="#~TQPicture"><b>~TQPicture</b></a> ()</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>uint <a href="#size"><b>size</b></a> () const</li>
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<li class=fn>const char * <a href="#data"><b>data</b></a> () const</li>
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<li class=fn>virtual void <a href="#setData"><b>setData</b></a> ( const char * data, uint size )</li>
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<li class=fn>bool <a href="#play"><b>play</b></a> ( TQPainter * painter )</li>
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<li class=fn>bool <a href="#load-2"><b>load</b></a> ( TQIODevice * dev, const char * format = 0 )</li>
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<li class=fn>bool <a href="#load"><b>load</b></a> ( const TQString & fileName, const char * format = 0 )</li>
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<li class=fn>bool <a href="#save-2"><b>save</b></a> ( TQIODevice * dev, const char * format = 0 )</li>
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<li class=fn>bool <a href="#save"><b>save</b></a> ( const TQString & fileName, const char * format = 0 )</li>
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<li class=fn>TQRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li>
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<li class=fn>void <a href="#setBoundingRect"><b>setBoundingRect</b></a> ( const TQRect & r )</li>
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<li class=fn>TQPicture & <a href="#operator-eq"><b>operator=</b></a> ( const TQPicture & p )</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn>virtual int <a href="#metric"><b>metric</b></a> ( int m ) const</li>
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<li class=fn>void <a href="#detach"><b>detach</b></a> ()</li>
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<li class=fn>TQPicture <a href="#copy"><b>copy</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>TQDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( TQDataStream & s, const TQPicture & r )</li>
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<li class=fn>TQDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( TQDataStream & s, TQPicture & 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 TQPicture class is a paint device that records and
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replays <a href="ntqpainter.html">TQPainter</a> commands.
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<p>
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<p> A picture serializes painter commands to an IO device in a
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platform-independent format. For example, a picture created under
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Windows can be read on a Sun SPARC.
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<p> Pictures are called meta-files on some platforms.
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<p> TQt pictures use a proprietary binary format. Unlike native picture
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(meta-file) formats on many window systems, TQt pictures have no
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limitations regarding their contents. Everything that can be
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painted can also be stored in a picture, e.g. fonts, pixmaps,
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regions, transformed graphics, etc.
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<p> TQPicture is an <a href="shclass.html">implicitly shared</a> class.
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<p> Example of how to record a picture:
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<pre>
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TQPicture pic;
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<a href="ntqpainter.html">TQPainter</a> p;
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p.<a href="ntqpainter.html#begin">begin</a>( &pic ); // paint in picture
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p.<a href="ntqpainter.html#drawEllipse">drawEllipse</a>( 10,20, 80,70 ); // draw an ellipse
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p.<a href="ntqpainter.html#end">end</a>(); // painting done
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pic.<a href="#save">save</a>( "drawing.pic" ); // save picture
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</pre>
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<p> Example of how to replay a picture:
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<pre>
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TQPicture pic;
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pic.<a href="#load">load</a>( "drawing.pic" ); // load picture
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<a href="ntqpainter.html">TQPainter</a> p;
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p.<a href="ntqpainter.html#begin">begin</a>( &myWidget ); // paint in myWidget
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p.<a href="ntqpainter.html#drawPicture">drawPicture</a>( pic ); // draw the picture
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p.<a href="ntqpainter.html#end">end</a>(); // painting done
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</pre>
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<p> Pictures can also be drawn using <a href="#play">play</a>(). Some basic data about a
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picture is available, for example, <a href="#size">size</a>(), <a href="#isNull">isNull</a>() and
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<a href="#boundingRect">boundingRect</a>().
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<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>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQPicture"></a>TQPicture::TQPicture ( int formatVersion = -1 )
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</h3>
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Constructs an empty picture.
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<p> The <em>formatVersion</em> parameter may be used to <em>create</em> a TQPicture
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that can be read by applications that are compiled with earlier
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versions of TQt.
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<ul>
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<li> <em>formatVersion</em> == 1 is binary compatible with TQt 1.x and later.
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<li> <em>formatVersion</em> == 2 is binary compatible with TQt 2.0.x and later.
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<li> <em>formatVersion</em> == 3 is binary compatible with TQt 2.1.x and later.
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<li> <em>formatVersion</em> == 4 is binary compatible with TQt 3.0.x and later.
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<li> <em>formatVersion</em> == 5 is binary compatible with TQt 3.1.
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</ul>
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<p> Note that the default formatVersion is -1 which signifies the
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current release, i.e. for TQt 3.1 a formatVersion of 5 is the same
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as the default formatVersion of -1.
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<p> Reading pictures generated by earlier versions of TQt is supported
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and needs no special coding; the format is automatically detected.
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<h3 class=fn><a name="TQPicture-2"></a>TQPicture::TQPicture ( const <a href="ntqpicture.html">TQPicture</a> & pic )
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</h3>
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Constructs a <a href="shclass.html">shallow copy</a> of <em>pic</em>.
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<h3 class=fn><a name="~TQPicture"></a>TQPicture::~TQPicture ()
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</h3>
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Destroys the picture.
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<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="boundingRect"></a>TQPicture::boundingRect () const
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</h3>
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Returns the picture's bounding rectangle or an invalid rectangle
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if the picture contains no data.
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<h3 class=fn><a href="ntqpicture.html">TQPicture</a> <a name="copy"></a>TQPicture::copy () const<tt> [protected]</tt>
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</h3>
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Returns a <a href="shclass.html">deep copy</a> of the picture.
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<h3 class=fn>const char * <a name="data"></a>TQPicture::data () const
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</h3>
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<p> Returns a pointer to the picture data. The pointer is only valid
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until the next non-const function is called on this picture. The
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returned pointer is 0 if the picture contains no data.
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<p> <p>See also <a href="#size">size</a>() and <a href="#isNull">isNull</a>().
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<h3 class=fn>void <a name="detach"></a>TQPicture::detach ()<tt> [protected]</tt>
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</h3>
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Detaches from shared picture data and makes sure that this picture
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is the only one referring to the data.
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<p> If multiple pictures share common data, this picture makes a copy
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of the data and detaches itself from the sharing mechanism.
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Nothing is done if there is just a single reference.
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<h3 class=fn>bool <a name="isNull"></a>TQPicture::isNull () const
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</h3>
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<p> Returns TRUE if the picture contains no data; otherwise returns
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FALSE.
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<h3 class=fn>bool <a name="load"></a>TQPicture::load ( const <a href="tqstring.html">TQString</a> & fileName, const char * format = 0 )
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</h3>
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Loads a picture from the file specified by <em>fileName</em> and returns
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TRUE if successful; otherwise returns FALSE.
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<p> By default, the file will be interpreted as being in the native
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TQPicture format. Specifying the <em>format</em> string is optional and
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is only needed for importing picture data stored in a different
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format.
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<p> Currently, the only external format supported is the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG</a> format which
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requires the <a href="xml.html">TQt XML module</a>. The
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corresponding <em>format</em> string is "svg".
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<p> <p>See also <a href="#save">save</a>().
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<p>Examples: <a href="picture-example.html#x122">picture/picture.cpp</a> and <a href="xform-example.html#x1244">xform/xform.cpp</a>.
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<h3 class=fn>bool <a name="load-2"></a>TQPicture::load ( <a href="ntqiodevice.html">TQIODevice</a> * dev, const char * format = 0 )
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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> <em>dev</em> is the device to use for loading.
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<h3 class=fn>int <a name="metric"></a>TQPicture::metric ( int m ) const<tt> [virtual protected]</tt>
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</h3>
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Internal implementation of the virtual TQPaintDevice::metric()
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function.
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<p> Use the <a href="ntqpaintdevicemetrics.html">TQPaintDeviceMetrics</a> class instead.
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<p> A picture has the following hard-coded values: dpi=72,
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numcolors=16777216 and depth=24.
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<p> <em>m</em> is the metric to get.
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<h3 class=fn><a href="ntqpicture.html">TQPicture</a> & <a name="operator-eq"></a>TQPicture::operator= ( const <a href="ntqpicture.html">TQPicture</a> & p )
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</h3>
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Assigns a <a href="shclass.html">shallow copy</a> of <em>p</em> to this
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picture and returns a reference to this picture.
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<h3 class=fn>bool <a name="play"></a>TQPicture::play ( <a href="ntqpainter.html">TQPainter</a> * painter )
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</h3>
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Replays the picture using <em>painter</em>, and returns TRUE if
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successful; otherwise returns FALSE.
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<p> This function does exactly the same as <a href="ntqpainter.html#drawPicture">TQPainter::drawPicture</a>()
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with (x, y) = (0, 0).
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<h3 class=fn>bool <a name="save"></a>TQPicture::save ( const <a href="tqstring.html">TQString</a> & fileName, const char * format = 0 )
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</h3>
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Saves a picture to the file specified by <em>fileName</em> and returns
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TRUE if successful; otherwise returns FALSE.
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<p> Specifying the file <em>format</em> string is optional. It's not
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recommended unless you intend to export the picture data for
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use by a third party reader. By default the data will be saved in
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the native TQPicture file format.
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<p> Currently, the only external format supported is the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG</a> format which
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requires the <a href="xml.html">TQt XML module</a>. The
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corresponding <em>format</em> string is "svg".
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<p> <p>See also <a href="#load">load</a>().
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<p>Example: <a href="picture-example.html#x123">picture/picture.cpp</a>.
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<h3 class=fn>bool <a name="save-2"></a>TQPicture::save ( <a href="ntqiodevice.html">TQIODevice</a> * dev, const char * format = 0 )
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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> <em>dev</em> is the device to use for saving.
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<h3 class=fn>void <a name="setBoundingRect"></a>TQPicture::setBoundingRect ( const <a href="ntqrect.html">TQRect</a> & r )
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</h3>
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Sets the picture's bounding rectangle to <em>r</em>. The automatically
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calculated value is overriden.
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<h3 class=fn>void <a name="setData"></a>TQPicture::setData ( const char * data, uint size )<tt> [virtual]</tt>
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</h3>
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Sets the picture data directly from <em>data</em> and <em>size</em>. This
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function copies the input data.
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<p> <p>See also <a href="#data">data</a>() and <a href="#size">size</a>().
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<h3 class=fn>uint <a name="size"></a>TQPicture::size () const
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</h3>
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<p> Returns the size of the picture data.
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<p> <p>See also <a href="#data">data</a>().
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<hr><h2>Related Functions</h2>
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<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="ntqdatastream.html">TQDataStream</a> & s, const <a href="ntqpicture.html">TQPicture</a> & r )
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</h3>
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<p> Writes picture <em>r</em> to the stream <em>s</em> and returns a reference to
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the stream.
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<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="ntqdatastream.html">TQDataStream</a> & s, <a href="ntqpicture.html">TQPicture</a> & r )
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</h3>
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<p> Reads a picture from the stream <em>s</em> into picture <em>r</em> and returns
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a reference to the stream.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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