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<a href="#pub-methods">Public Member Functions</a> &#124;
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  <div class="headertitle">
<div class="title">QwtTextEngine Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div>  </div>
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<p>Abstract base class for rendering text strings.  
 <a href="class_qwt_text_engine.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="qwt__text__engine_8h_source.html">qwt_text_engine.h</a>&gt;</code></p>
<div class="dynheader">
Inheritance diagram for QwtTextEngine:</div>
<div class="dyncontent">
<div class="center"><img src="class_qwt_text_engine__inherit__graph.png" border="0" usemap="#a_qwt_text_engine_inherit__map" alt="Inheritance graph"/></div>
<map name="_qwt_text_engine_inherit__map" id="a_qwt_text_engine_inherit__map">
<area shape="rect" title="Abstract base class for rendering text strings." alt="" coords="201,5,311,32"/>
<area shape="rect" href="class_qwt_math_m_l_text_engine.html" title="Text Engine for the MathML renderer of the Qt solutions package." alt="" coords="5,80,163,107"/>
<area shape="rect" href="class_qwt_plain_text_engine.html" title="A text engine for plain texts." alt="" coords="187,80,325,107"/>
<area shape="rect" href="class_qwt_rich_text_engine.html" title="A text engine for Qt rich texts." alt="" coords="349,80,488,107"/>
</map>
<center><span class="legend">[<a target="top" href="graph_legend.html">legend</a>]</span></center></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:adda9e23494429c54b3cc3452940fb2bc"><td class="memItemLeft" align="right" valign="top"><a id="adda9e23494429c54b3cc3452940fb2bc"></a>
virtual&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_text_engine.html#adda9e23494429c54b3cc3452940fb2bc">~QwtTextEngine</a> ()</td></tr>
<tr class="memdesc:adda9e23494429c54b3cc3452940fb2bc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor. <br /></td></tr>
<tr class="separator:adda9e23494429c54b3cc3452940fb2bc"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aee891b14d90c817b8c73d551f623cc17"><td class="memItemLeft" align="right" valign="top">virtual double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_text_engine.html#aee891b14d90c817b8c73d551f623cc17">heightForWidth</a> (const QFont &amp;font, int flags, const QString &amp;text, double width) const =0</td></tr>
<tr class="separator:aee891b14d90c817b8c73d551f623cc17"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad9382cc8ff22c6b3e448fce566a76178"><td class="memItemLeft" align="right" valign="top">virtual QSizeF&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_text_engine.html#ad9382cc8ff22c6b3e448fce566a76178">textSize</a> (const QFont &amp;font, int flags, const QString &amp;text) const =0</td></tr>
<tr class="separator:ad9382cc8ff22c6b3e448fce566a76178"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a98316f2f6f4f50216ceffbe9babe2901"><td class="memItemLeft" align="right" valign="top">virtual bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_text_engine.html#a98316f2f6f4f50216ceffbe9babe2901">mightRender</a> (const QString &amp;text) const =0</td></tr>
<tr class="separator:a98316f2f6f4f50216ceffbe9babe2901"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a83c8d3dc590b9914e9216c01e78e0838"><td class="memItemLeft" align="right" valign="top">virtual void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_text_engine.html#a83c8d3dc590b9914e9216c01e78e0838">textMargins</a> (const QFont &amp;font, const QString &amp;text, double &amp;left, double &amp;right, double &amp;top, double &amp;bottom) const =0</td></tr>
<tr class="separator:a83c8d3dc590b9914e9216c01e78e0838"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad727f58f9eebfec86369e7f2e5bf6a59"><td class="memItemLeft" align="right" valign="top">virtual void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_text_engine.html#ad727f58f9eebfec86369e7f2e5bf6a59">draw</a> (QPainter *painter, const QRectF &amp;rect, int flags, const QString &amp;text) const =0</td></tr>
<tr class="separator:ad727f58f9eebfec86369e7f2e5bf6a59"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:a97c5ef76ee920ab0f19e178e85017d9d"><td class="memItemLeft" align="right" valign="top"><a id="a97c5ef76ee920ab0f19e178e85017d9d"></a>
&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_text_engine.html#a97c5ef76ee920ab0f19e178e85017d9d">QwtTextEngine</a> ()</td></tr>
<tr class="memdesc:a97c5ef76ee920ab0f19e178e85017d9d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Constructor. <br /></td></tr>
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</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Abstract base class for rendering text strings. </p>
<p>A text engine is responsible for rendering texts for a specific text format. They are used by <a class="el" href="class_qwt_text.html" title="A class representing a text.">QwtText</a> to render a text.</p>
<p><a class="el" href="class_qwt_plain_text_engine.html" title="A text engine for plain texts.">QwtPlainTextEngine</a> and <a class="el" href="class_qwt_rich_text_engine.html" title="A text engine for Qt rich texts.">QwtRichTextEngine</a> are part of the Qwt library. The implementation of <a class="el" href="class_qwt_math_m_l_text_engine.html" title="Text Engine for the MathML renderer of the Qt solutions package.">QwtMathMLTextEngine</a> uses code from the Qt solution package. Because of license implications it is built into a separate library.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_text.html#aef6a1e71b1feba3116ce69f6c9de70ad">QwtText::setTextEngine()</a> </dd></dl>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="ad727f58f9eebfec86369e7f2e5bf6a59"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad727f58f9eebfec86369e7f2e5bf6a59">&#9670;&nbsp;</a></span>draw()</h2>

<div class="memitem">
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  <tr>
  <td class="mlabels-left">
      <table class="memname">
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          <td class="memname">virtual void QwtTextEngine::draw </td>
          <td>(</td>
          <td class="paramtype">QPainter *&#160;</td>
          <td class="paramname"><em>painter</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const QRectF &amp;&#160;</td>
          <td class="paramname"><em>rect</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>flags</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const QString &amp;&#160;</td>
          <td class="paramname"><em>text</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Draw the text in a clipping rectangle</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">painter</td><td>Painter </td></tr>
    <tr><td class="paramname">rect</td><td>Clipping rectangle </td></tr>
    <tr><td class="paramname">flags</td><td>Bitwise OR of the flags like in for QPainter::drawText() </td></tr>
    <tr><td class="paramname">text</td><td>Text to be rendered </td></tr>
  </table>
  </dd>
</dl>

<p>Implemented in <a class="el" href="class_qwt_math_m_l_text_engine.html#a7d762090045267910dfd579defb6fa29">QwtMathMLTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#a06a4adbfd09b33896c8df14d861311ae">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_plain_text_engine.html#a84d8e3e2a4710d3e1143ca47020f1c4a">QwtPlainTextEngine</a>.</p>

</div>
</div>
<a id="aee891b14d90c817b8c73d551f623cc17"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aee891b14d90c817b8c73d551f623cc17">&#9670;&nbsp;</a></span>heightForWidth()</h2>

<div class="memitem">
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  <tr>
  <td class="mlabels-left">
      <table class="memname">
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          <td class="memname">virtual double QwtTextEngine::heightForWidth </td>
          <td>(</td>
          <td class="paramtype">const QFont &amp;&#160;</td>
          <td class="paramname"><em>font</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>flags</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const QString &amp;&#160;</td>
          <td class="paramname"><em>text</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double&#160;</td>
          <td class="paramname"><em>width</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Find the height for a given width</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">font</td><td>Font of the text </td></tr>
    <tr><td class="paramname">flags</td><td>Bitwise OR of the flags used like in QPainter::drawText </td></tr>
    <tr><td class="paramname">text</td><td>Text to be rendered </td></tr>
    <tr><td class="paramname">width</td><td>Width</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Calculated height </dd></dl>

<p>Implemented in <a class="el" href="class_qwt_math_m_l_text_engine.html#a9b9d72be4816b901acd3a9e3e8754712">QwtMathMLTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#aba12fcba7303a187128cb01d06ecb382">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_plain_text_engine.html#ac5cedc0d644433b2ff14b3740996eb7d">QwtPlainTextEngine</a>.</p>

</div>
</div>
<a id="a98316f2f6f4f50216ceffbe9babe2901"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a98316f2f6f4f50216ceffbe9babe2901">&#9670;&nbsp;</a></span>mightRender()</h2>

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  <td class="mlabels-left">
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          <td class="memname">virtual bool QwtTextEngine::mightRender </td>
          <td>(</td>
          <td class="paramtype">const QString &amp;&#160;</td>
          <td class="paramname"><em>text</em></td><td>)</td>
          <td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Test if a string can be rendered by this text engine</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">text</td><td>Text to be tested </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>true, if it can be rendered </dd></dl>

<p>Implemented in <a class="el" href="class_qwt_math_m_l_text_engine.html#adbb0723b8a7f8ab9ff612d062d5f053b">QwtMathMLTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#a597cd0341d44bc364dab2f5e70cd0674">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_plain_text_engine.html#ad210b32f1218447fcff3dafafd0a9fb9">QwtPlainTextEngine</a>.</p>

</div>
</div>
<a id="a83c8d3dc590b9914e9216c01e78e0838"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a83c8d3dc590b9914e9216c01e78e0838">&#9670;&nbsp;</a></span>textMargins()</h2>

<div class="memitem">
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  <tr>
  <td class="mlabels-left">
      <table class="memname">
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          <td class="memname">virtual void QwtTextEngine::textMargins </td>
          <td>(</td>
          <td class="paramtype">const QFont &amp;&#160;</td>
          <td class="paramname"><em>font</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const QString &amp;&#160;</td>
          <td class="paramname"><em>text</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double &amp;&#160;</td>
          <td class="paramname"><em>left</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double &amp;&#160;</td>
          <td class="paramname"><em>right</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double &amp;&#160;</td>
          <td class="paramname"><em>top</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double &amp;&#160;</td>
          <td class="paramname"><em>bottom</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Return margins around the texts</p>
<p>The textSize might include margins around the text, like QFontMetrics::descent(). In situations where texts need to be aligned in detail, knowing these margins might improve the layout calculations.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">font</td><td>Font of the text </td></tr>
    <tr><td class="paramname">text</td><td>Text to be rendered </td></tr>
    <tr><td class="paramname">left</td><td>Return value for the left margin </td></tr>
    <tr><td class="paramname">right</td><td>Return value for the right margin </td></tr>
    <tr><td class="paramname">top</td><td>Return value for the top margin </td></tr>
    <tr><td class="paramname">bottom</td><td>Return value for the bottom margin </td></tr>
  </table>
  </dd>
</dl>

<p>Implemented in <a class="el" href="class_qwt_math_m_l_text_engine.html#a7ae2e9d5cd4f841baf746652aa24042c">QwtMathMLTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#a8aaca45963ed5ab76bfe6161e0ebc964">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_plain_text_engine.html#a4ed2a4aa7574f1badc88a3118a0de502">QwtPlainTextEngine</a>.</p>

</div>
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<a id="ad9382cc8ff22c6b3e448fce566a76178"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ad9382cc8ff22c6b3e448fce566a76178">&#9670;&nbsp;</a></span>textSize()</h2>

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          <td class="memname">virtual QSizeF QwtTextEngine::textSize </td>
          <td>(</td>
          <td class="paramtype">const QFont &amp;&#160;</td>
          <td class="paramname"><em>font</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>flags</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const QString &amp;&#160;</td>
          <td class="paramname"><em>text</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td> const</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">
<p>Returns the size, that is needed to render text</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">font</td><td>Font of the text </td></tr>
    <tr><td class="paramname">flags</td><td>Bitwise OR of the flags like in for QPainter::drawText </td></tr>
    <tr><td class="paramname">text</td><td>Text to be rendered</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Calculated size </dd></dl>

<p>Implemented in <a class="el" href="class_qwt_math_m_l_text_engine.html#a82ca1c89927b32a32829680e4be63001">QwtMathMLTextEngine</a>, <a class="el" href="class_qwt_rich_text_engine.html#ad644bf615cf2f27bc51e941d9bdcb509">QwtRichTextEngine</a>, and <a class="el" href="class_qwt_plain_text_engine.html#ab4937c7b9d44aa4d1cc5dcd1d7740b3b">QwtPlainTextEngine</a>.</p>

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