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<div class="title">QCPPaintBufferGlFbo Class Reference</div> </div>
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<p>A paint buffer based on OpenGL frame buffers objects, using hardware accelerated rendering.
<a href="classQCPPaintBufferGlFbo.html#details">More...</a></p>
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Inheritance diagram for QCPPaintBufferGlFbo:</div>
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<area shape="rect" id="node2" href="classQCPAbstractPaintBuffer.html" title="The abstract base class for paint buffers, which define the rendering backend. " alt="" coords="4,5,157,29"/>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Functions</h2></td></tr>
<tr class="memitem:af38531a341082feeeb22ed86922601cb"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPPaintBufferGlFbo.html#af38531a341082feeeb22ed86922601cb">QCPPaintBufferGlFbo</a> (const QSize &size, double devicePixelRatio, QWeakPointer< QOpenGLContext > glContext, QWeakPointer< QOpenGLPaintDevice > glPaintDevice)</td></tr>
<tr class="separator:af38531a341082feeeb22ed86922601cb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a26a67e7d30770513626e1fa56ce7e92a"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classQCPPainter.html">QCPPainter</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPPaintBufferGlFbo.html#a26a67e7d30770513626e1fa56ce7e92a">startPainting</a> ()</td></tr>
<tr class="separator:a26a67e7d30770513626e1fa56ce7e92a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae7f157a529e63e375be2c32950ad5a9c"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPPaintBufferGlFbo.html#ae7f157a529e63e375be2c32950ad5a9c">donePainting</a> ()</td></tr>
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<tr class="memitem:abea347b90aa4ccaa8e754f7ea5446779"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPPaintBufferGlFbo.html#abea347b90aa4ccaa8e754f7ea5446779">draw</a> (<a class="el" href="classQCPPainter.html">QCPPainter</a> *painter) const</td></tr>
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<tr class="memitem:a15399ce6ffd20d9d01e2f09b7c232143"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPPaintBufferGlFbo.html#a15399ce6ffd20d9d01e2f09b7c232143">clear</a> (const QColor &color)</td></tr>
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<tr class="inherit_header pub_methods_classQCPAbstractPaintBuffer"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classQCPAbstractPaintBuffer')"><img src="closed.png" alt="-"/> Public Functions inherited from <a class="el" href="classQCPAbstractPaintBuffer.html">QCPAbstractPaintBuffer</a></td></tr>
<tr class="memitem:a3ce532c12f10b81697108835755641e2 inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPAbstractPaintBuffer.html#a3ce532c12f10b81697108835755641e2">QCPAbstractPaintBuffer</a> (const QSize &size, double devicePixelRatio)</td></tr>
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<tr class="memitem:a3ea8284e547985c5d263f26a6adfa11f inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memItemLeft" align="right" valign="top"><a id="a3ea8284e547985c5d263f26a6adfa11f"></a>
QSize </td><td class="memItemRight" valign="bottom"><b>size</b> () const</td></tr>
<tr class="separator:a3ea8284e547985c5d263f26a6adfa11f inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memSeparator" colspan="2"> </td></tr>
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bool </td><td class="memItemRight" valign="bottom"><b>invalidated</b> () const</td></tr>
<tr class="separator:a76bf771cda945a6c602cf9b7d365d92b inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aac1b981f8c1744036610ff1a6b9461f9 inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memItemLeft" align="right" valign="top"><a id="aac1b981f8c1744036610ff1a6b9461f9"></a>
double </td><td class="memItemRight" valign="bottom"><b>devicePixelRatio</b> () const</td></tr>
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<tr class="memitem:a8b68c3cd36533f1a4a23b5ce8cd66f01 inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPAbstractPaintBuffer.html#a8b68c3cd36533f1a4a23b5ce8cd66f01">setSize</a> (const QSize &size)</td></tr>
<tr class="separator:a8b68c3cd36533f1a4a23b5ce8cd66f01 inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ae4c7dc70dfc66be2879ce297b2b3d67f inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPAbstractPaintBuffer.html#ae4c7dc70dfc66be2879ce297b2b3d67f">setInvalidated</a> (bool invalidated=true)</td></tr>
<tr class="separator:ae4c7dc70dfc66be2879ce297b2b3d67f inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a555eaad5d5c806420ff35602a1bb68fa inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPAbstractPaintBuffer.html#a555eaad5d5c806420ff35602a1bb68fa">setDevicePixelRatio</a> (double ratio)</td></tr>
<tr class="separator:a555eaad5d5c806420ff35602a1bb68fa inherit pub_methods_classQCPAbstractPaintBuffer"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Functions</h2></td></tr>
<tr class="memitem:a116e73dfc70ff70f8d196ecdb5256ce5"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classQCPPaintBufferGlFbo.html#a116e73dfc70ff70f8d196ecdb5256ce5">reallocateBuffer</a> ()</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A paint buffer based on OpenGL frame buffers objects, using hardware accelerated rendering. </p>
<p>This paint buffer is one of the OpenGL paint buffers which facilitate hardware accelerated plot rendering. It is based on OpenGL frame buffer objects (fbo) and is used in Qt versions 5.0 and higher. (See <a class="el" href="classQCPPaintBufferGlPbuffer.html">QCPPaintBufferGlPbuffer</a> used in older Qt versions.)</p>
<p>The OpenGL paint buffers are used if <a class="el" href="classQCustomPlot.html#a7db1adc09016329f3aef7c60da935789">QCustomPlot::setOpenGl</a> is set to true, and if they are supported by the system. </p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#af38531a341082feeeb22ed86922601cb">§ </a></span>QCPPaintBufferGlFbo()</h2>
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<td class="memname">QCPPaintBufferGlFbo::QCPPaintBufferGlFbo </td>
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<p>Creates a <a class="el" href="classQCPPaintBufferGlFbo.html">QCPPaintBufferGlFbo</a> instance with the specified <em>size</em> and <em>devicePixelRatio</em>, if applicable.</p>
<p>All frame buffer objects shall share one OpenGL context and paint device, which need to be set up externally and passed via <em>glContext</em> and <em>glPaintDevice</em>. The set-up is done in <a class="el" href="classQCustomPlot.html#a8954c4667c51070ff4e9b02d858fd190">QCustomPlot::setupOpenGl</a> and the context and paint device are managed by the parent <a class="el" href="classQCustomPlot.html" title="The central class of the library. This is the QWidget which displays the plot and interacts with the ...">QCustomPlot</a> instance. </p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a26a67e7d30770513626e1fa56ce7e92a">§ </a></span>startPainting()</h2>
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<td class="memname"><a class="el" href="classQCPPainter.html">QCPPainter</a> * QCPPaintBufferGlFbo::startPainting </td>
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<p>Returns a <a class="el" href="classQCPPainter.html">QCPPainter</a> which is ready to draw to this buffer. The ownership and thus the responsibility to delete the painter after the painting operations are complete is given to the caller of this method.</p>
<p>Once you are done using the painter, delete the painter and call <a class="el" href="classQCPPaintBufferGlFbo.html#ae7f157a529e63e375be2c32950ad5a9c">donePainting</a>.</p>
<p>While a painter generated with this method is active, you must not call <a class="el" href="classQCPAbstractPaintBuffer.html#a8b68c3cd36533f1a4a23b5ce8cd66f01">setSize</a>, <a class="el" href="classQCPAbstractPaintBuffer.html#a555eaad5d5c806420ff35602a1bb68fa">setDevicePixelRatio</a> or <a class="el" href="classQCPPaintBufferGlFbo.html#a15399ce6ffd20d9d01e2f09b7c232143">clear</a>.</p>
<p>This method may return 0, if a painter couldn't be activated on the buffer. This usually indicates a problem with the respective painting backend. </p>
<p>Implements <a class="el" href="classQCPAbstractPaintBuffer.html#a9e9f29b19c033cf02fb96f1a148463f3">QCPAbstractPaintBuffer</a>.</p>
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<td class="memname">void QCPPaintBufferGlFbo::donePainting </td>
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<p>If you have acquired a <a class="el" href="classQCPPainter.html">QCPPainter</a> to paint onto this paint buffer via <a class="el" href="classQCPPaintBufferGlFbo.html#a26a67e7d30770513626e1fa56ce7e92a">startPainting</a>, call this method as soon as you are done with the painting operations and have deleted the painter.</p>
<p>paint buffer subclasses may use this method to perform any type of cleanup that is necessary. The default implementation does nothing. </p>
<p>Reimplemented from <a class="el" href="classQCPAbstractPaintBuffer.html#a41b0dc6e7744f19fae09f8532c207dc1">QCPAbstractPaintBuffer</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#abea347b90aa4ccaa8e754f7ea5446779">§ </a></span>draw()</h2>
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<td class="memname">void QCPPaintBufferGlFbo::draw </td>
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<p>Draws the contents of this buffer with the provided <em>painter</em>. This is the method that is used to finally join all paint buffers and draw them onto the screen. </p>
<p>Implements <a class="el" href="classQCPAbstractPaintBuffer.html#afb998c7525e3ae37d9d2d46c7aaf461a">QCPAbstractPaintBuffer</a>.</p>
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<td class="memname">void QCPPaintBufferGlFbo::clear </td>
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<p>Fills the entire buffer with the provided <em>color</em>. To have an empty transparent buffer, use the named color <code>Qt::transparent</code>.</p>
<p>This method must not be called if there is currently a painter (acquired with <a class="el" href="classQCPPaintBufferGlFbo.html#a26a67e7d30770513626e1fa56ce7e92a">startPainting</a>) active. </p>
<p>Implements <a class="el" href="classQCPAbstractPaintBuffer.html#a9e253f4541dfc01992b77e8830bd7722">QCPAbstractPaintBuffer</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a116e73dfc70ff70f8d196ecdb5256ce5">§ </a></span>reallocateBuffer()</h2>
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<p>Reallocates the internal buffer with the currently configured size (<a class="el" href="classQCPAbstractPaintBuffer.html#a8b68c3cd36533f1a4a23b5ce8cd66f01">setSize</a>) and device pixel ratio, if applicable (<a class="el" href="classQCPAbstractPaintBuffer.html#a555eaad5d5c806420ff35602a1bb68fa">setDevicePixelRatio</a>). It is called as soon as any of those properties are changed on this paint buffer.</p>
<dl class="section note"><dt>Note</dt><dd>Subclasses of <a class="el" href="classQCPAbstractPaintBuffer.html">QCPAbstractPaintBuffer</a> must call their reimplementation of this method in their constructor, to perform the first allocation (this can not be done by the base class because calling pure virtual methods in base class constructors is not possible). </dd></dl>
<p>Implements <a class="el" href="classQCPAbstractPaintBuffer.html#aee7506a52bd7e5a07c2af27935eb13e7">QCPAbstractPaintBuffer</a>.</p>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li>src/paintbuffer.h</li>
<li>src/paintbuffer.cpp</li>
</ul>
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