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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Qwt User's Guide: QwtPaintBuffer Class Reference</title>
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<div class="qindex"><a class="qindex" href="index.html">Main Page</a> | <a class="qindex" href="hierarchy.html">Class Hierarchy</a> | <a class="qindex" href="classes.html">Alphabetical List</a> | <a class="qindex" href="annotated.html">Class List</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Class Members</a> | <a class="qindex" href="globals.html">File Members</a> | <a class="qindex" href="pages.html">Related Pages</a></div>
<h1>QwtPaintBuffer Class Reference</h1><a href="class_qwt_paint_buffer-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
Paint buffer for Qwt widgets.
<p>
QwtPaintBuffer offers a simple way to en/disable double buffering. Double buffering is enabled as default and in general there will be no reason to change this.
<p>
Definition at line <a class="el" href="qwt__paint__buffer_8h-source.html#l00026">26</a> of file <a class="el" href="qwt__paint__buffer_8h-source.html">qwt_paint_buffer.h</a>.<table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a0">QwtPaintBuffer</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a1">QwtPaintBuffer</a> (QPaintDevice *, const QRect &, QPainter *p=NULL)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>virtual </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a2">~QwtPaintBuffer</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a3">open</a> (QPaintDevice *, const QRect &, QPainter *p=NULL)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a4">close</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>QPainter * </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a5">painter</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>const QPaintDevice * </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a6">device</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>const QPixmap & </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#a7">buffer</a> () const</td></tr>
<tr><td colspan=2><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#e0">setEnabled</a> (bool enable)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#e1">isEnabled</a> ()</td></tr>
<tr><td colspan=2><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="class_qwt_paint_buffer.html#b0">flush</a> ()</td></tr>
</table>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a0" doxytag="QwtPaintBuffer::QwtPaintBuffer" ></a><p>
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<td class="md" nowrap valign="top"> QwtPaintBuffer::QwtPaintBuffer </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
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</td>
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<td>
</td>
<td>
<p>
Default constructor.
<p>
Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00017">17</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>. </td>
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<a class="anchor" name="a1" doxytag="QwtPaintBuffer::QwtPaintBuffer" ></a><p>
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<td class="md" nowrap valign="top"> QwtPaintBuffer::QwtPaintBuffer </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QPaintDevice * </td>
<td class="mdname" nowrap> <em>device</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const QRect & </td>
<td class="mdname" nowrap> <em>rect</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>QPainter * </td>
<td class="mdname" nowrap> <em>painter</em> = <code>NULL</code></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Create an open paint buffer <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>device</em> </td><td>Device to paint on </td></tr>
<tr><td></td><td valign=top><em>rect</em> </td><td>Rect to paint on </td></tr>
<tr><td></td><td valign=top><em>painter</em> </td><td>Painter to paint on device. In case of 0 QwtPaintBuffer uses an internal painter</td></tr>
</table>
</dl>
<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_paint_buffer.html#a3">QwtPaintBuffer::open()</a> </dd></dl>
Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00034">34</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
References <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00097">open()</a>. </td>
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</table>
<a class="anchor" name="a2" doxytag="QwtPaintBuffer::~QwtPaintBuffer" ></a><p>
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<td class="md" nowrap valign="top"> QwtPaintBuffer::~<a class="el" href="class_qwt_paint_buffer.html">QwtPaintBuffer</a> </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
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</td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Closes the buffer <dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_paint_buffer.html#a4">QwtPaintBuffer::close()</a> </dd></dl>
Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00047">47</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
References <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00178">close()</a>. </td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a7" doxytag="QwtPaintBuffer::buffer" ></a><p>
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<td class="md" nowrap valign="top"> const QPixmap& QwtPaintBuffer::buffer </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const</td>
</tr>
</table>
</td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Return Buffer used for double buffering.
<p>
Definition at line <a class="el" href="qwt__paint__buffer_8h-source.html#l00044">44</a> of file <a class="el" href="qwt__paint__buffer_8h-source.html">qwt_paint_buffer.h</a>.
<p>
Referenced by <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00174">QwtPlotCanvas::drawCanvas()</a>. </td>
</tr>
</table>
<a class="anchor" name="a4" doxytag="QwtPaintBuffer::close" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="md" nowrap valign="top"> void QwtPaintBuffer::close </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Flush the internal pixmap buffer to the device and close the buffer. Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00178">178</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
References <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00151">flush()</a>.
<p>
Referenced by <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00097">open()</a>, and <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00047">~QwtPaintBuffer()</a>. </td>
</tr>
</table>
<a class="anchor" name="a6" doxytag="QwtPaintBuffer::device" ></a><p>
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<td class="md" nowrap valign="top"> const QPaintDevice * QwtPaintBuffer::device </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
<dl compact><dt><b>Returns:</b></dt><dd>Device to paint on </dd></dl>
Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00066">66</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
Referenced by <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00151">flush()</a>. </td>
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<a class="anchor" name="b0" doxytag="QwtPaintBuffer::flush" ></a><p>
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<td class="md" nowrap valign="top"> void QwtPaintBuffer::flush </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [protected]</code></td>
</tr>
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</td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Flush the internal pixmap buffer to the device. Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00151">151</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
References <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00066">device()</a>.
<p>
Referenced by <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00178">close()</a>. </td>
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<a class="anchor" name="e1" doxytag="QwtPaintBuffer::isEnabled" ></a><p>
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<td class="md" nowrap valign="top"> bool QwtPaintBuffer::isEnabled </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
</tr>
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
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</td>
<td>
<p>
<dl compact><dt><b>Returns:</b></dt><dd>TRUE if double buffering is enabled, FALSE otherwise. </dd></dl>
Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00084">84</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
Referenced by <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00174">QwtPlotCanvas::drawCanvas()</a>, and <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00097">open()</a>. </td>
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<a class="anchor" name="a3" doxytag="QwtPaintBuffer::open" ></a><p>
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<td class="md" nowrap valign="top"> void QwtPaintBuffer::open </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">QPaintDevice * </td>
<td class="mdname" nowrap> <em>device</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const QRect & </td>
<td class="mdname" nowrap> <em>rect</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>QPainter * </td>
<td class="mdname" nowrap> <em>painter</em> = <code>NULL</code></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Open the buffer <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>device</em> </td><td>Device to paint on </td></tr>
<tr><td></td><td valign=top><em>rect</em> </td><td>Rect to paint on </td></tr>
<tr><td></td><td valign=top><em>painter</em> </td><td>Painter to paint on device. In case of 0 QwtPaintBuffer uses an internal painter </td></tr>
</table>
</dl>
Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00097">97</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
References <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00178">close()</a>, and <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00084">isEnabled()</a>.
<p>
Referenced by <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00034">QwtPaintBuffer()</a>. </td>
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<a class="anchor" name="a5" doxytag="QwtPaintBuffer::painter" ></a><p>
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<td class="md" nowrap valign="top"> QPainter * QwtPaintBuffer::painter </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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</td>
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<p>
<dl compact><dt><b>Returns:</b></dt><dd>Depending on <a class="el" href="class_qwt_paint_buffer.html#e1">isEnabled()</a> the painter connected to an internal pixmap buffer otherwise the painter connected to the device. </dd></dl>
Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00058">58</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>.
<p>
Referenced by <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00174">QwtPlotCanvas::drawCanvas()</a>, <a class="el" href="qwt__wheel_8cpp-source.html#l00425">QwtWheel::paintEvent()</a>, <a class="el" href="qwt__thermo_8cpp-source.html#l00068">QwtThermo::paintEvent()</a>, <a class="el" href="qwt__slider_8cpp-source.html#l00391">QwtSlider::paintEvent()</a>, <a class="el" href="qwt__scale_8cpp-source.html#l00413">QwtScale::paintEvent()</a>, <a class="el" href="qwt__knob_8cpp-source.html#l00262">QwtKnob::paintEvent()</a>, and <a class="el" href="qwt__dial_8cpp-source.html#l00372">QwtDial::paintEvent()</a>. </td>
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<a class="anchor" name="e0" doxytag="QwtPaintBuffer::setEnabled" ></a><p>
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<td class="md" nowrap valign="top"> void QwtPaintBuffer::setEnabled </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">bool </td>
<td class="mdname1" valign="top" nowrap> <em>enable</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [static]</code></td>
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Enable/Disable double buffering. Please note that this is a global switch for all QwtPaintBuffers, but won't change opened buffers. Definition at line <a class="el" href="qwt__paint__buffer_8cpp-source.html#l00076">76</a> of file <a class="el" href="qwt__paint__buffer_8cpp-source.html">qwt_paint_buffer.cpp</a>. </td>
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