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<title>Qwt Polar User's Guide: QwtPolarCanvas Class Reference</title>
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<div id="projectname">Qwt Polar User's Guide <span id="projectnumber">0.1.0</span></div>
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<div class="title">QwtPolarCanvas Class Reference</div> </div>
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<!-- doxytag: class="QwtPolarCanvas" -->
<p>Canvas of a <a class="el" href="class_qwt_polar_plot.html" title="A plotting widget, displaying a polar coordinate system.">QwtPolarPlot</a>.
<a href="class_qwt_polar_canvas.html#details">More...</a></p>
<p><code>#include <<a class="el" href="qwt__polar__canvas_8h_source.html">qwt_polar_canvas.h</a>></code></p>
<p><a href="class_qwt_polar_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_polar_canvas.html#a371f88face8daaac6cd556e5f7596613">PaintAttribute</a> { <b>PaintCached</b> = 1
}</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"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#aa5f39d822a71e056b4735da113a0a4e5">QwtPolarCanvas</a> (<a class="el" href="class_qwt_polar_plot.html">QwtPolarPlot</a> *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#aaf0b8442dc8b32353d7705c9dcc28bc0">~QwtPolarCanvas</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="class_qwt_polar_plot.html">QwtPolarPlot</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#a2f3dc31a8c28390e3a7ec13cab60250e">plot</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="class_qwt_polar_plot.html">QwtPolarPlot</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#a5dbeb0e16e24c256825a51a1a92d4162">plot</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_polar_canvas.html#ae7010120b9f6905bd31f748775c80b6c">setPaintAttribute</a> (<a class="el" href="class_qwt_polar_canvas.html#a371f88face8daaac6cd556e5f7596613">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_polar_canvas.html#aaf6c538d5c26945df4dbbc2121f4d859">testPaintAttribute</a> (<a class="el" href="class_qwt_polar_canvas.html#a371f88face8daaac6cd556e5f7596613">PaintAttribute</a>) const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">QPixmap * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#ad72862ab45a58af5bac31d7ab49160f1">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_polar_canvas.html#a5908eb231fc964e5828141836cb9c534">paintCache</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_polar_canvas.html#a7035d414994046cd347241fcb71bffcd">invalidatePaintCache</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">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#ab8718969291c05c56050f9500da212ad">paintEvent</a> (QPaintEvent *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#aa3418bc87d68888ac73c70e52a476c27">resizeEvent</a> (QResizeEvent *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#a44ae4b67914f5b9d7ce447166f6fcddc">drawContents</a> (QPainter *)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_polar_canvas.html#adf1b99b4cb84cb5c17e09f695aa6834a">drawCanvas</a> (QPainter *, const QwtDoubleRect &)</td></tr>
<tr><td colspan="2"><h2><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a7a25af1dea5f56f213e3b979a743cad2"></a><!-- doxytag: member="QwtPolarCanvas::d_data" ref="a7a25af1dea5f56f213e3b979a743cad2" args="" -->
PrivateData * </td><td class="memItemRight" valign="bottom"><b>d_data</b></td></tr>
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<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Canvas of a <a class="el" href="class_qwt_polar_plot.html" title="A plotting widget, displaying a polar coordinate system.">QwtPolarPlot</a>. </p>
<p>The canvas is the widget, where all polar items are painted to.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>In opposite to QwtPlot all axes are painted on the canvas. </dd></dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_polar_plot.html" title="A plotting widget, displaying a polar coordinate system.">QwtPolarPlot</a> </dd></dl>
</div><hr/><h2>Member Enumeration Documentation</h2>
<a class="anchor" id="a371f88face8daaac6cd556e5f7596613"></a><!-- doxytag: member="QwtPolarCanvas::PaintAttribute" ref="a371f88face8daaac6cd556e5f7596613" args="" -->
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<td class="memname">enum <a class="el" href="class_qwt_polar_canvas.html#a371f88face8daaac6cd556e5f7596613">QwtPolarCanvas::PaintAttribute</a></td>
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<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.</li>
</ul>
<p>The default setting enables PaintCached </p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_polar_canvas.html#ae7010120b9f6905bd31f748775c80b6c" title="Changing the paint attributes.">setPaintAttribute()</a>, <a class="el" href="class_qwt_polar_canvas.html#aaf6c538d5c26945df4dbbc2121f4d859">testPaintAttribute()</a>, <a class="el" href="class_qwt_polar_canvas.html#ad72862ab45a58af5bac31d7ab49160f1" title="Return the paint cache, might be null.">paintCache()</a> </dd></dl>
</div>
</div>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="aa5f39d822a71e056b4735da113a0a4e5"></a><!-- doxytag: member="QwtPolarCanvas::QwtPolarCanvas" ref="aa5f39d822a71e056b4735da113a0a4e5" args="(QwtPolarPlot *)" -->
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<td class="memname">QwtPolarCanvas::QwtPolarCanvas </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_polar_plot.html">QwtPolarPlot</a> * </td>
<td class="paramname"><em>plot</em></td><td>)</td>
<td><code> [explicit]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Constructor. </p>
</div>
</div>
<a class="anchor" id="aaf0b8442dc8b32353d7705c9dcc28bc0"></a><!-- doxytag: member="QwtPolarCanvas::~QwtPolarCanvas" ref="aaf0b8442dc8b32353d7705c9dcc28bc0" args="()" -->
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<td class="memname">QwtPolarCanvas::~QwtPolarCanvas </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td><code> [virtual]</code></td>
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</table>
</div>
<div class="memdoc">
<p>Destructor. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="adf1b99b4cb84cb5c17e09f695aa6834a"></a><!-- doxytag: member="QwtPolarCanvas::drawCanvas" ref="adf1b99b4cb84cb5c17e09f695aa6834a" args="(QPainter *, const QwtDoubleRect &)" -->
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<td class="memname">void QwtPolarCanvas::drawCanvas </td>
<td>(</td>
<td class="paramtype">QPainter * </td>
<td class="paramname"><em>painter</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const QwtDoubleRect & </td>
<td class="paramname"><em>canvasRect</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [protected]</code></td>
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<div class="memdoc">
<p>Draw the the canvas</p>
<p>Paints all plot items to the canvasRect, using <a class="el" href="class_qwt_polar_plot.html#a05f3a23edf65849c844e4feca3ebbe76">QwtPolarPlot::drawCanvas</a> and updates the paint cache.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_polar_plot.html#a05f3a23edf65849c844e4feca3ebbe76">QwtPolarPlot::drawCanvas</a>, setPaintAttributes(), testPaintAttributes() </dd></dl>
</div>
</div>
<a class="anchor" id="a44ae4b67914f5b9d7ce447166f6fcddc"></a><!-- doxytag: member="QwtPolarCanvas::drawContents" ref="a44ae4b67914f5b9d7ce447166f6fcddc" args="(QPainter *)" -->
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<td class="memname">void QwtPolarCanvas::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. </p>
</div>
</div>
<a class="anchor" id="a7035d414994046cd347241fcb71bffcd"></a><!-- doxytag: member="QwtPolarCanvas::invalidatePaintCache" ref="a7035d414994046cd347241fcb71bffcd" args="()" -->
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<td class="memname">void QwtPolarCanvas::invalidatePaintCache </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Invalidate the internal paint cache. </p>
</div>
</div>
<a class="anchor" id="ad72862ab45a58af5bac31d7ab49160f1"></a><!-- doxytag: member="QwtPolarCanvas::paintCache" ref="ad72862ab45a58af5bac31d7ab49160f1" args="()" -->
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<td class="memname">QPixmap * QwtPolarCanvas::paintCache </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Return the paint cache, might be null. </p>
</div>
</div>
<a class="anchor" id="a5908eb231fc964e5828141836cb9c534"></a><!-- doxytag: member="QwtPolarCanvas::paintCache" ref="a5908eb231fc964e5828141836cb9c534" args="() const " -->
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<td class="memname">const QPixmap * QwtPolarCanvas::paintCache </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Return the paint cache, might be null. </p>
</div>
</div>
<a class="anchor" id="ab8718969291c05c56050f9500da212ad"></a><!-- doxytag: member="QwtPolarCanvas::paintEvent" ref="ab8718969291c05c56050f9500da212ad" args="(QPaintEvent *)" -->
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<td class="memname">void QwtPolarCanvas::paintEvent </td>
<td>(</td>
<td class="paramtype">QPaintEvent * </td>
<td class="paramname"><em>event</em></td><td>)</td>
<td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Paint event. </p>
</div>
</div>
<a class="anchor" id="a2f3dc31a8c28390e3a7ec13cab60250e"></a><!-- doxytag: member="QwtPolarCanvas::plot" ref="a2f3dc31a8c28390e3a7ec13cab60250e" args="()" -->
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<td class="memname"><a class="el" href="class_qwt_polar_plot.html">QwtPolarPlot</a> * QwtPolarCanvas::plot </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
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</div>
<div class="memdoc">
<p>Return parent plot widget. </p>
</div>
</div>
<a class="anchor" id="a5dbeb0e16e24c256825a51a1a92d4162"></a><!-- doxytag: member="QwtPolarCanvas::plot" ref="a5dbeb0e16e24c256825a51a1a92d4162" args="() const " -->
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<td class="memname">const <a class="el" href="class_qwt_polar_plot.html">QwtPolarPlot</a> * QwtPolarCanvas::plot </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Return parent plot widget. </p>
</div>
</div>
<a class="anchor" id="aa3418bc87d68888ac73c70e52a476c27"></a><!-- doxytag: member="QwtPolarCanvas::resizeEvent" ref="aa3418bc87d68888ac73c70e52a476c27" args="(QResizeEvent *)" -->
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<td class="memname">void QwtPolarCanvas::resizeEvent </td>
<td>(</td>
<td class="paramtype">QResizeEvent * </td>
<td class="paramname"><em>event</em></td><td>)</td>
<td><code> [protected, virtual]</code></td>
</tr>
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<div class="memdoc">
<p>Resize event. </p>
</div>
</div>
<a class="anchor" id="ae7010120b9f6905bd31f748775c80b6c"></a><!-- doxytag: member="QwtPolarCanvas::setPaintAttribute" ref="ae7010120b9f6905bd31f748775c80b6c" args="(PaintAttribute, bool on=true)" -->
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<td class="memname">void QwtPolarCanvas::setPaintAttribute </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_polar_canvas.html#a371f88face8daaac6cd556e5f7596613">PaintAttribute</a> </td>
<td class="paramname"><em>attribute</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>on</em> = <code>true</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<div class="memdoc">
<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</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_polar_canvas.html#aaf6c538d5c26945df4dbbc2121f4d859">testPaintAttribute()</a>, <a class="el" href="class_qwt_polar_canvas.html#adf1b99b4cb84cb5c17e09f695aa6834a">drawCanvas()</a>, <a class="el" href="class_qwt_polar_canvas.html#a44ae4b67914f5b9d7ce447166f6fcddc" title="Redraw the canvas.">drawContents()</a>, <a class="el" href="class_qwt_polar_canvas.html#ad72862ab45a58af5bac31d7ab49160f1" title="Return the paint cache, might be null.">paintCache()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="aaf6c538d5c26945df4dbbc2121f4d859"></a><!-- doxytag: member="QwtPolarCanvas::testPaintAttribute" ref="aaf6c538d5c26945df4dbbc2121f4d859" args="(PaintAttribute) const " -->
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<td class="memname">bool QwtPolarCanvas::testPaintAttribute </td>
<td>(</td>
<td class="paramtype"><a class="el" href="class_qwt_polar_canvas.html#a371f88face8daaac6cd556e5f7596613">PaintAttribute</a> </td>
<td class="paramname"><em>attribute</em></td><td>)</td>
<td> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<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_polar_canvas.html#ae7010120b9f6905bd31f748775c80b6c" title="Changing the paint attributes.">setPaintAttribute()</a> </dd></dl>
</div>
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