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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Qwt User's Guide: QwtPlotCanvas Class Reference</title>
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<div id="projectname">Qwt User's Guide <span id="projectnumber">5.2.2</span></div>
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</ul>
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<div class="header">
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<a href="#pub-types">Public Types</a> |
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<div class="headertitle">
<h1>QwtPlotCanvas Class Reference</h1> </div>
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<div class="contents">
<!-- doxytag: class="QwtPlotCanvas" -->
<p>Canvas of a <a class="el" href="class_qwt_plot.html" title="A 2-D plotting widget.">QwtPlot</a>.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="qwt__plot__canvas_8h_source.html">qwt_plot_canvas.h</a>></code></p>
<p><a href="class_qwt_plot_canvas-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a> { <br/>
  <b>NoFocusIndicator</b>,
<br/>
  <b>CanvasFocusIndicator</b>,
<br/>
  <b>ItemFocusIndicator</b>
<br/>
}</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a76066290edb594a71ee09be564563b0f">PaintAttribute</a> { <br/>
  <b>PaintCached</b> = 1,
<br/>
  <b>PaintPacked</b> = 2
<br/>
}</td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a0e9653bdf8c62299dbc3551ac7e5ec51">focusIndicator</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#ad03018bfc24f361e4ba359643c5c23b6">invalidatePaintCache</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPixmap * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a9181564270ad961288f6651dcd08ad15">paintCache</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const QPixmap * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a1f5bfe56b2c65bdb956cc0a9d805d1ae">paintCache</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="class_qwt_plot.html">QwtPlot</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a72550d1af1b5fb4caca5269c3d5891f9">plot</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_plot.html">QwtPlot</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a1b720b99dc1b686f58e789b13f339f63">plot</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#ae708ed2bc2fe614a809b9b70c9e8959e">QwtPlotCanvas</a> (<a class="el" href="class_qwt_plot.html">QwtPlot</a> *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a1548423348c29001ee2b6fd1c0f9f033">replot</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#ae7330616dbb97128d01c5446ef0b006e">setFocusIndicator</a> (<a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a>)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a7859beb87bcef4fd53f99e7c87104e27">setPaintAttribute</a> (<a class="el" href="class_qwt_plot_canvas.html#a76066290edb594a71ee09be564563b0f">PaintAttribute</a>, bool on=true)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a804f78518b0ba72b11ba996fd2457fb1">testPaintAttribute</a> (<a class="el" href="class_qwt_plot_canvas.html#a76066290edb594a71ee09be564563b0f">PaintAttribute</a>) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a320320bbb1b511c0c37fb2452a7f4404">~QwtPlotCanvas</a> ()</td></tr>
<tr><td colspan="2"><h2><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a48cd4c52f0524f1a21fa53201159aa7c">drawCanvas</a> (QPainter *painter=NULL)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a3c6e3cddf7fe4f48db64459b01a37301">drawContents</a> (QPainter *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a4dc526ac5186fe253a158a392bbb4f40">drawFocusIndicator</a> (QPainter *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a97e862e6c27fd0f88c5eccc5e4e64096">hideEvent</a> (QHideEvent *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#aa8f1516817c578efd407d8dd574170ec">paintEvent</a> (QPaintEvent *)</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Canvas of a <a class="el" href="class_qwt_plot.html" title="A 2-D plotting widget.">QwtPlot</a>. </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot.html" title="A 2-D plotting widget.">QwtPlot</a> </dd></dl>
</div><hr/><h2>Member Enumeration Documentation</h2>
<a class="anchor" id="a89b44e4c28038a674ce211fe9ac2d7be"></a><!-- doxytag: member="QwtPlotCanvas::FocusIndicator" ref="a89b44e4c28038a674ce211fe9ac2d7be" args="" -->
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<div class="memproto">
<table class="memname">
<tr>
<td class="memname">enum <a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be">QwtPlotCanvas::FocusIndicator</a></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Focus indicator. </p>
<ul>
<li>NoFocusIndicator<br/>
Don't paint a focus indicator</li>
</ul>
<ul>
<li>CanvasFocusIndicator<br/>
The focus is related to the complete canvas. Paint the focus indicator using paintFocus()</li>
</ul>
<ul>
<li>ItemFocusIndicator<br/>
The focus is related to an item (curve, point, ...) on the canvas. It is up to the application to display a focus indication using f.e. highlighting.</li>
</ul>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#ae7330616dbb97128d01c5446ef0b006e">setFocusIndicator()</a>, <a class="el" href="class_qwt_plot_canvas.html#a0e9653bdf8c62299dbc3551ac7e5ec51">focusIndicator()</a>, paintFocus() </dd></dl>
</div>
</div>
<a class="anchor" id="a76066290edb594a71ee09be564563b0f"></a><!-- doxytag: member="QwtPlotCanvas::PaintAttribute" ref="a76066290edb594a71ee09be564563b0f" args="" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">enum <a class="el" href="class_qwt_plot_canvas.html#a76066290edb594a71ee09be564563b0f">QwtPlotCanvas::PaintAttribute</a></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Paint attributes. </p>
<ul>
<li>PaintCached<br/>
Paint double buffered and reuse the content of the pixmap buffer for some spontaneous repaints that happen when a plot gets unhidden, deiconified or changes the focus. Disabling the cache will improve the performance for incremental paints (using <a class="el" href="class_qwt_plot_curve.html#a8d52afdd1612ccb4dbf3f410886e680b" title="Draw the complete curve.">QwtPlotCurve::draw</a>).</li>
</ul>
<ul>
<li>PaintPacked<br/>
Suppress system background repaints and paint it together with the canvas contents. Painting packed might avoid flickering for expensive repaints, when there is a notable gap between painting the background and the plot contents.</li>
</ul>
<p>The default setting enables PaintCached and PaintPacked</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#a7859beb87bcef4fd53f99e7c87104e27" title="Changing the paint attributes.">setPaintAttribute()</a>, <a class="el" href="class_qwt_plot_canvas.html#a804f78518b0ba72b11ba996fd2457fb1">testPaintAttribute()</a>, <a class="el" href="class_qwt_plot_canvas.html#a9181564270ad961288f6651dcd08ad15" title="Return the paint cache, might be null.">paintCache()</a> </dd></dl>
</div>
</div>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="ae708ed2bc2fe614a809b9b70c9e8959e"></a><!-- doxytag: member="QwtPlotCanvas::QwtPlotCanvas" ref="ae708ed2bc2fe614a809b9b70c9e8959e" args="(QwtPlot *)" -->
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<td class="memname">QwtPlotCanvas::QwtPlotCanvas </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_plot.html">QwtPlot</a> * </td>
<td class="paramname"><em>plot</em></td><td>)</td>
<td><code> [explicit]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Sets a cross cursor, enables QwtPlotCanvas::PaintCached. </p>
</div>
</div>
<a class="anchor" id="a320320bbb1b511c0c37fb2452a7f4404"></a><!-- doxytag: member="QwtPlotCanvas::~QwtPlotCanvas" ref="a320320bbb1b511c0c37fb2452a7f4404" args="()" -->
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<td class="memname">QwtPlotCanvas::~QwtPlotCanvas </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Destructor. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a48cd4c52f0524f1a21fa53201159aa7c"></a><!-- doxytag: member="QwtPlotCanvas::drawCanvas" ref="a48cd4c52f0524f1a21fa53201159aa7c" args="(QPainter *painter=NULL)" -->
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<td class="memname">void QwtPlotCanvas::drawCanvas </td>
<td>(</td>
<td class="paramtype">QPainter * </td>
<td class="paramname"><em>painter</em> = <code>NULL</code></td><td>)</td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Draw the the canvas</p>
<p>Paints all plot items to the contentsRect(), using <a class="el" href="class_qwt_plot.html#add1b88d8312e2671652d23f8181f2433">QwtPlot::drawCanvas</a> and updates the paint cache.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">painter</td><td>Painter</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot.html#add1b88d8312e2671652d23f8181f2433">QwtPlot::drawCanvas()</a>, setPaintAttributes(), testPaintAttributes() </dd></dl>
</div>
</div>
<a class="anchor" id="a3c6e3cddf7fe4f48db64459b01a37301"></a><!-- doxytag: member="QwtPlotCanvas::drawContents" ref="a3c6e3cddf7fe4f48db64459b01a37301" args="(QPainter *)" -->
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<td class="memname">void QwtPlotCanvas::drawContents </td>
<td>(</td>
<td class="paramtype">QPainter * </td>
<td class="paramname"><em>painter</em></td><td>)</td>
<td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Redraw the canvas, and focus rect </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">painter</td><td>Painter </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a4dc526ac5186fe253a158a392bbb4f40"></a><!-- doxytag: member="QwtPlotCanvas::drawFocusIndicator" ref="a4dc526ac5186fe253a158a392bbb4f40" args="(QPainter *)" -->
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<td class="memname">void QwtPlotCanvas::drawFocusIndicator </td>
<td>(</td>
<td class="paramtype">QPainter * </td>
<td class="paramname"><em>painter</em></td><td>)</td>
<td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Draw the focus indication </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">painter</td><td>Painter </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a0e9653bdf8c62299dbc3551ac7e5ec51"></a><!-- doxytag: member="QwtPlotCanvas::focusIndicator" ref="a0e9653bdf8c62299dbc3551ac7e5ec51" args="() const " -->
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<td class="memname"><a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be">QwtPlotCanvas::FocusIndicator</a> QwtPlotCanvas::focusIndicator </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<dl class="return"><dt><b>Returns:</b></dt><dd>Focus indicator</dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be" title="Focus indicator.">FocusIndicator</a>, <a class="el" href="class_qwt_plot_canvas.html#ae7330616dbb97128d01c5446ef0b006e">setFocusIndicator()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="a97e862e6c27fd0f88c5eccc5e4e64096"></a><!-- doxytag: member="QwtPlotCanvas::hideEvent" ref="a97e862e6c27fd0f88c5eccc5e4e64096" args="(QHideEvent *)" -->
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<td class="memname">void QwtPlotCanvas::hideEvent </td>
<td>(</td>
<td class="paramtype">QHideEvent * </td>
<td class="paramname"><em>event</em></td><td>)</td>
<td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Hide event </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">event</td><td>Hide event </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ad03018bfc24f361e4ba359643c5c23b6"></a><!-- doxytag: member="QwtPlotCanvas::invalidatePaintCache" ref="ad03018bfc24f361e4ba359643c5c23b6" args="()" -->
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<td class="memname">void QwtPlotCanvas::invalidatePaintCache </td>
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<td class="paramname"></td><td>)</td>
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<p>Invalidate the internal paint cache. </p>
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<a class="anchor" id="a1f5bfe56b2c65bdb956cc0a9d805d1ae"></a><!-- doxytag: member="QwtPlotCanvas::paintCache" ref="a1f5bfe56b2c65bdb956cc0a9d805d1ae" args="() const " -->
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<td class="memname">const QPixmap * QwtPlotCanvas::paintCache </td>
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<td> const</td>
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<p>Return the paint cache, might be null. </p>
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<a class="anchor" id="a9181564270ad961288f6651dcd08ad15"></a><!-- doxytag: member="QwtPlotCanvas::paintCache" ref="a9181564270ad961288f6651dcd08ad15" args="()" -->
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<td class="memname">QPixmap * QwtPlotCanvas::paintCache </td>
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<p>Return the paint cache, might be null. </p>
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<a class="anchor" id="aa8f1516817c578efd407d8dd574170ec"></a><!-- doxytag: member="QwtPlotCanvas::paintEvent" ref="aa8f1516817c578efd407d8dd574170ec" args="(QPaintEvent *)" -->
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<td class="memname">void QwtPlotCanvas::paintEvent </td>
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<td><code> [protected, virtual]</code></td>
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<p>Paint event </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">event</td><td>Paint event </td></tr>
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</dd>
</dl>
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<a class="anchor" id="a72550d1af1b5fb4caca5269c3d5891f9"></a><!-- doxytag: member="QwtPlotCanvas::plot" ref="a72550d1af1b5fb4caca5269c3d5891f9" args="() const " -->
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<td class="memname">const <a class="el" href="class_qwt_plot.html">QwtPlot</a> * QwtPlotCanvas::plot </td>
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<td> const</td>
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<p>Return parent plot widget. </p>
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<a class="anchor" id="a1b720b99dc1b686f58e789b13f339f63"></a><!-- doxytag: member="QwtPlotCanvas::plot" ref="a1b720b99dc1b686f58e789b13f339f63" args="()" -->
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<td class="memname"><a class="el" href="class_qwt_plot.html">QwtPlot</a> * QwtPlotCanvas::plot </td>
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<p>Return parent plot widget. </p>
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<a class="anchor" id="a1548423348c29001ee2b6fd1c0f9f033"></a><!-- doxytag: member="QwtPlotCanvas::replot" ref="a1548423348c29001ee2b6fd1c0f9f033" args="()" -->
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<td class="memname">void QwtPlotCanvas::replot </td>
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<p>Invalidate the paint cache and repaint the canvas </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#ad03018bfc24f361e4ba359643c5c23b6" title="Invalidate the internal paint cache.">invalidatePaintCache()</a> </dd></dl>
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<a class="anchor" id="ae7330616dbb97128d01c5446ef0b006e"></a><!-- doxytag: member="QwtPlotCanvas::setFocusIndicator" ref="ae7330616dbb97128d01c5446ef0b006e" args="(FocusIndicator)" -->
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<td class="memname">void QwtPlotCanvas::setFocusIndicator </td>
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<td class="paramtype"><a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a> </td>
<td class="paramname"><em>focusIndicator</em></td><td>)</td>
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<p>Set the focus indicator</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#a89b44e4c28038a674ce211fe9ac2d7be" title="Focus indicator.">FocusIndicator</a>, <a class="el" href="class_qwt_plot_canvas.html#a0e9653bdf8c62299dbc3551ac7e5ec51">focusIndicator()</a> </dd></dl>
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<a class="anchor" id="a7859beb87bcef4fd53f99e7c87104e27"></a><!-- doxytag: member="QwtPlotCanvas::setPaintAttribute" ref="a7859beb87bcef4fd53f99e7c87104e27" args="(PaintAttribute, bool on=true)" -->
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<td class="memname">void QwtPlotCanvas::setPaintAttribute </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_plot_canvas.html#a76066290edb594a71ee09be564563b0f">PaintAttribute</a> </td>
<td class="paramname"><em>attribute</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>on</em> = <code>true</code> </td>
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<td></td>
<td>)</td>
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<p>Changing the paint attributes. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">attribute</td><td>Paint attribute </td></tr>
<tr><td class="paramname">on</td><td>On/Off</td></tr>
</table>
</dd>
</dl>
<p>The default setting enables PaintCached and PaintPacked</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#a804f78518b0ba72b11ba996fd2457fb1">testPaintAttribute()</a>, <a class="el" href="class_qwt_plot_canvas.html#a48cd4c52f0524f1a21fa53201159aa7c">drawCanvas()</a>, <a class="el" href="class_qwt_plot_canvas.html#a3c6e3cddf7fe4f48db64459b01a37301">drawContents()</a>, <a class="el" href="class_qwt_plot_canvas.html#a9181564270ad961288f6651dcd08ad15" title="Return the paint cache, might be null.">paintCache()</a> </dd></dl>
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<a class="anchor" id="a804f78518b0ba72b11ba996fd2457fb1"></a><!-- doxytag: member="QwtPlotCanvas::testPaintAttribute" ref="a804f78518b0ba72b11ba996fd2457fb1" args="(PaintAttribute) const " -->
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<td class="memname">bool QwtPlotCanvas::testPaintAttribute </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_plot_canvas.html#a76066290edb594a71ee09be564563b0f">PaintAttribute</a> </td>
<td class="paramname"><em>attribute</em></td><td>)</td>
<td> const</td>
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<p>Test wether a paint attribute is enabled</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">attribute</td><td>Paint attribute </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>true if the attribute is enabled </dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#a7859beb87bcef4fd53f99e7c87104e27" title="Changing the paint attributes.">setPaintAttribute()</a> </dd></dl>
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