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587 lines
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<a href="#pub-types">Public Types</a> |
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<div class="title">QwtRasterData Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<p><a class="el" href="class_qwt_raster_data.html" title="QwtRasterData defines an interface to any type of raster data.">QwtRasterData</a> defines an interface to any type of raster data.
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<a href="class_qwt_raster_data.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="qwt__raster__data_8h_source.html">qwt_raster_data.h</a>></code></p>
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Inheritance diagram for QwtRasterData:</div>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
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Public Types</h2></td></tr>
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<tr class="memitem:aa9a0ea0f92af158a354421c3651fdfaf"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">Attribute</a> { <a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfafac421ef9c406513f8c068aa88794f48c2">WithoutGaps</a> = 0x01
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}</td></tr>
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<tr class="memdesc:aa9a0ea0f92af158a354421c3651fdfaf"><td class="mdescLeft"> </td><td class="mdescRight">Raster data attributes. <a href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">More...</a><br /></td></tr>
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<tr class="separator:aa9a0ea0f92af158a354421c3651fdfaf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac0053b66315fde6f0a9a69c40d7c5dcc"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dcc">ConrecFlag</a> { <a class="el" href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dccafd2f6337e825201a247408f033713c92">IgnoreAllVerticesOnLevel</a> = 0x01
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, <a class="el" href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dcca18e8d1de171dd43cc957c279eb03d32c">IgnoreOutOfRange</a> = 0x02
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}</td></tr>
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<tr class="memdesc:ac0053b66315fde6f0a9a69c40d7c5dcc"><td class="mdescLeft"> </td><td class="mdescRight">Flags to modify the contour algorithm. <a href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dcc">More...</a><br /></td></tr>
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<tr class="separator:ac0053b66315fde6f0a9a69c40d7c5dcc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a2632728957a7c118d225d63ab539b21d"><td class="memItemLeft" align="right" valign="top"><a id="a2632728957a7c118d225d63ab539b21d"></a>
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typedef <a class="el" href="class_q_map.html">QMap</a>< double, QPolygonF > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a2632728957a7c118d225d63ab539b21d">ContourLines</a></td></tr>
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<tr class="memdesc:a2632728957a7c118d225d63ab539b21d"><td class="mdescLeft"> </td><td class="mdescRight">Contour lines. <br /></td></tr>
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<tr class="separator:a2632728957a7c118d225d63ab539b21d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6f5308c40f5394e3956cf0c03d75f2c6"><td class="memItemLeft" align="right" valign="top">typedef QFlags< <a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">Attribute</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a6f5308c40f5394e3956cf0c03d75f2c6">Attributes</a></td></tr>
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<tr class="separator:a6f5308c40f5394e3956cf0c03d75f2c6"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a32c7f179e655dcc2fca1fdb851c1570e"><td class="memItemLeft" align="right" valign="top">typedef QFlags< <a class="el" href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dcc">ConrecFlag</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a32c7f179e655dcc2fca1fdb851c1570e">ConrecFlags</a></td></tr>
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<tr class="separator:a32c7f179e655dcc2fca1fdb851c1570e"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a0fc20e05a794c0dc85f6ae5719566588"><td class="memItemLeft" align="right" valign="top"><a id="a0fc20e05a794c0dc85f6ae5719566588"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a0fc20e05a794c0dc85f6ae5719566588">QwtRasterData</a> ()</td></tr>
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<tr class="memdesc:a0fc20e05a794c0dc85f6ae5719566588"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br /></td></tr>
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<tr class="memitem:a95b24c7cad42c5f7947e64e990def3e8"><td class="memItemLeft" align="right" valign="top"><a id="a95b24c7cad42c5f7947e64e990def3e8"></a>
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virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a95b24c7cad42c5f7947e64e990def3e8">~QwtRasterData</a> ()</td></tr>
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<tr class="memdesc:a95b24c7cad42c5f7947e64e990def3e8"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br /></td></tr>
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<tr class="separator:a95b24c7cad42c5f7947e64e990def3e8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa4f0f8b9dcdc1f4ceef4429dd132f492"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#aa4f0f8b9dcdc1f4ceef4429dd132f492">setAttribute</a> (<a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">Attribute</a>, bool on=true)</td></tr>
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<tr class="separator:aa4f0f8b9dcdc1f4ceef4429dd132f492"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a0df063cd367b161526429b671b0adebf"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a0df063cd367b161526429b671b0adebf">testAttribute</a> (<a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">Attribute</a>) const</td></tr>
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<tr class="separator:a0df063cd367b161526429b671b0adebf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:abe716e1d7ba8b5319c98995cd34c952e"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_qwt_interval.html">QwtInterval</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#abe716e1d7ba8b5319c98995cd34c952e">interval</a> (Qt::Axis) const =0</td></tr>
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<tr class="separator:abe716e1d7ba8b5319c98995cd34c952e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a0557ff0444301b1c6dd9277d857d7ee7"><td class="memItemLeft" align="right" valign="top">virtual QRectF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a0557ff0444301b1c6dd9277d857d7ee7">pixelHint</a> (const QRectF &) const</td></tr>
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<tr class="memdesc:a0557ff0444301b1c6dd9277d857d7ee7"><td class="mdescLeft"> </td><td class="mdescRight">Pixel hint. <a href="class_qwt_raster_data.html#a0557ff0444301b1c6dd9277d857d7ee7">More...</a><br /></td></tr>
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<tr class="separator:a0557ff0444301b1c6dd9277d857d7ee7"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a64f5bf40b6138cc66719a56555c03589"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a64f5bf40b6138cc66719a56555c03589">initRaster</a> (const QRectF &, const QSize &raster)</td></tr>
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<tr class="memdesc:a64f5bf40b6138cc66719a56555c03589"><td class="mdescLeft"> </td><td class="mdescRight">Initialize a raster. <a href="class_qwt_raster_data.html#a64f5bf40b6138cc66719a56555c03589">More...</a><br /></td></tr>
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<tr class="separator:a64f5bf40b6138cc66719a56555c03589"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a369a5f525814bf569e01f88fbd8ddb5b"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a369a5f525814bf569e01f88fbd8ddb5b">discardRaster</a> ()</td></tr>
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<tr class="memdesc:a369a5f525814bf569e01f88fbd8ddb5b"><td class="mdescLeft"> </td><td class="mdescRight">Discard a raster. <a href="class_qwt_raster_data.html#a369a5f525814bf569e01f88fbd8ddb5b">More...</a><br /></td></tr>
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<tr class="separator:a369a5f525814bf569e01f88fbd8ddb5b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6396fc013fcec893b1e8cea4cf03691e"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a6396fc013fcec893b1e8cea4cf03691e">value</a> (double x, double y) const =0</td></tr>
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<tr class="separator:a6396fc013fcec893b1e8cea4cf03691e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a79e1f7503d18b9f42abc51a0446924f6"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_qwt_raster_data.html#a2632728957a7c118d225d63ab539b21d">ContourLines</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a79e1f7503d18b9f42abc51a0446924f6">contourLines</a> (const QRectF &rect, const QSize &raster, const <a class="el" href="class_q_list.html">QList</a>< double > &levels, <a class="el" href="class_qwt_raster_data.html#a32c7f179e655dcc2fca1fdb851c1570e">ConrecFlags</a>) const</td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p><a class="el" href="class_qwt_raster_data.html" title="QwtRasterData defines an interface to any type of raster data.">QwtRasterData</a> defines an interface to any type of raster data. </p>
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<p><a class="el" href="class_qwt_raster_data.html" title="QwtRasterData defines an interface to any type of raster data.">QwtRasterData</a> is an abstract interface, that is used by <a class="el" href="class_qwt_plot_raster_item.html" title="A class, which displays raster data.">QwtPlotRasterItem</a> to find the values at the pixels of its raster.</p>
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<p>Gaps inside the bounding rectangle of the data can be indicated by NaN values ( when WithoutGaps is disabled ).</p>
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<p>Often a raster item is used to display values from a matrix. Then the derived raster data class needs to implement some sort of resampling, that maps the raster of the matrix into the requested raster of the raster item ( depending on resolution and scales of the canvas ).</p>
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<p><a class="el" href="class_qwt_matrix_raster_data.html" title="A class representing a matrix of values as raster data.">QwtMatrixRasterData</a> implements raster data, that returns values from a given 2D matrix.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_matrix_raster_data.html" title="A class representing a matrix of values as raster data.">QwtMatrixRasterData</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8h_source.html#l00042">42</a> of file <a class="el" href="qwt__raster__data_8h_source.html">qwt_raster_data.h</a>.</p>
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</div><h2 class="groupheader">Member Typedef Documentation</h2>
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<a id="a6f5308c40f5394e3956cf0c03d75f2c6"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a6f5308c40f5394e3956cf0c03d75f2c6">◆ </a></span>Attributes</h2>
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<td class="memname">typedef QFlags<<a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">Attribute</a> > <a class="el" href="class_qwt_raster_data.html#a6f5308c40f5394e3956cf0c03d75f2c6">QwtRasterData::Attributes</a></td>
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</div><div class="memdoc">
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<p>An ORed combination of <a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">Attribute</a> values. </p>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8h_source.html#l00074">74</a> of file <a class="el" href="qwt__raster__data_8h_source.html">qwt_raster_data.h</a>.</p>
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<a id="a32c7f179e655dcc2fca1fdb851c1570e"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a32c7f179e655dcc2fca1fdb851c1570e">◆ </a></span>ConrecFlags</h2>
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<td class="memname">typedef QFlags<<a class="el" href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dcc">ConrecFlag</a> > <a class="el" href="class_qwt_raster_data.html#a32c7f179e655dcc2fca1fdb851c1570e">QwtRasterData::ConrecFlags</a></td>
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<p>An ORed combination of <a class="el" href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dcc">ConrecFlag</a> values. </p>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8h_source.html#l00086">86</a> of file <a class="el" href="qwt__raster__data_8h_source.html">qwt_raster_data.h</a>.</p>
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<h2 class="groupheader">Member Enumeration Documentation</h2>
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<a id="aa9a0ea0f92af158a354421c3651fdfaf"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#aa9a0ea0f92af158a354421c3651fdfaf">◆ </a></span>Attribute</h2>
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<td class="memname">enum <a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf">QwtRasterData::Attribute</a></td>
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<p>Raster data attributes. </p>
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<p>Additional information that is used to improve processing of the data. </p>
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<table class="fieldtable">
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="aa9a0ea0f92af158a354421c3651fdfafac421ef9c406513f8c068aa88794f48c2"></a>WithoutGaps </td><td class="fielddoc"><p>The bounding rectangle of the data is spanned by the interval(Qt::XAxis) and interval(Qt::YAxis).</p>
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<p>WithoutGaps indicates, that the data has no gaps ( unknown values ) in this area and the result of <a class="el" href="class_qwt_raster_data.html#a6396fc013fcec893b1e8cea4cf03691e">value()</a> does not need to be checked for NaN values.</p>
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<p>Enabling this flag will have an positive effect on the performance of rendering a <a class="el" href="class_qwt_plot_spectrogram.html" title="A plot item, which displays a spectrogram.">QwtPlotSpectrogram</a>.</p>
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<p>The default setting is false.</p>
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<dl class="section note"><dt>Note</dt><dd>NaN values indicate an undefined value </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8h_source.html#l00054">54</a> of file <a class="el" href="qwt__raster__data_8h_source.html">qwt_raster_data.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac0053b66315fde6f0a9a69c40d7c5dcc">◆ </a></span>ConrecFlag</h2>
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<td class="memname">enum <a class="el" href="class_qwt_raster_data.html#ac0053b66315fde6f0a9a69c40d7c5dcc">QwtRasterData::ConrecFlag</a></td>
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<p>Flags to modify the contour algorithm. </p>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="ac0053b66315fde6f0a9a69c40d7c5dccafd2f6337e825201a247408f033713c92"></a>IgnoreAllVerticesOnLevel </td><td class="fielddoc"><p>Ignore all vertices on the same level. </p>
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<tr><td class="fieldname"><a id="ac0053b66315fde6f0a9a69c40d7c5dcca18e8d1de171dd43cc957c279eb03d32c"></a>IgnoreOutOfRange </td><td class="fielddoc"><p>Ignore all values, that are out of range. </p>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8h_source.html#l00077">77</a> of file <a class="el" href="qwt__raster__data_8h_source.html">qwt_raster_data.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a79e1f7503d18b9f42abc51a0446924f6">◆ </a></span>contourLines()</h2>
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<td class="memname"><a class="el" href="class_qwt_raster_data.html#a2632728957a7c118d225d63ab539b21d">QwtRasterData::ContourLines</a> QwtRasterData::contourLines </td>
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<td>(</td>
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<td class="paramtype">const QRectF & </td>
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<p>Calculate contour lines</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">rect</td><td>Bounding rectangle for the contour lines </td></tr>
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<tr><td class="paramname">raster</td><td>Number of data pixels of the raster data </td></tr>
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<tr><td class="paramname">levels</td><td>List of limits, where to insert contour lines </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Calculated contour lines</dd></dl>
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<p>An adaption of CONREC, a simple contouring algorithm. <a href="http://local.wasp.uwa.edu.au/~pbourke/papers/conrec/">http://local.wasp.uwa.edu.au/~pbourke/papers/conrec/</a> </p>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8cpp_source.html#l00286">286</a> of file <a class="el" href="qwt__raster__data_8cpp_source.html">qwt_raster_data.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a369a5f525814bf569e01f88fbd8ddb5b">◆ </a></span>discardRaster()</h2>
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<p>Discard a raster. </p>
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<p>After the composition of an image <a class="el" href="class_qwt_plot_spectrogram.html" title="A plot item, which displays a spectrogram.">QwtPlotSpectrogram</a> calls <a class="el" href="class_qwt_raster_data.html#a369a5f525814bf569e01f88fbd8ddb5b" title="Discard a raster.">discardRaster()</a>.</p>
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<p>The default implementation does nothing, but if data has been loaded in <a class="el" href="class_qwt_raster_data.html#a64f5bf40b6138cc66719a56555c03589" title="Initialize a raster.">initRaster()</a>, it could deleted now.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_raster_data.html#a64f5bf40b6138cc66719a56555c03589" title="Initialize a raster.">initRaster()</a>, <a class="el" href="class_qwt_raster_data.html#a6396fc013fcec893b1e8cea4cf03691e">value()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8cpp_source.html#l00237">237</a> of file <a class="el" href="qwt__raster__data_8cpp_source.html">qwt_raster_data.cpp</a>.</p>
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<p>Initialize a raster. </p>
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<p>Before the composition of an image <a class="el" href="class_qwt_plot_spectrogram.html" title="A plot item, which displays a spectrogram.">QwtPlotSpectrogram</a> calls <a class="el" href="class_qwt_raster_data.html#a64f5bf40b6138cc66719a56555c03589" title="Initialize a raster.">initRaster()</a>, announcing the area and its resolution that will be requested.</p>
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<p>The default implementation does nothing, but for data sets that are stored in files, it might be good idea to reimplement <a class="el" href="class_qwt_raster_data.html#a64f5bf40b6138cc66719a56555c03589" title="Initialize a raster.">initRaster()</a>, where the data is resampled and loaded into memory.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_raster_data.html#a64f5bf40b6138cc66719a56555c03589" title="Initialize a raster.">initRaster()</a>, <a class="el" href="class_qwt_raster_data.html#a6396fc013fcec893b1e8cea4cf03691e">value()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8cpp_source.html#l00221">221</a> of file <a class="el" href="qwt__raster__data_8cpp_source.html">qwt_raster_data.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#abe716e1d7ba8b5319c98995cd34c952e">◆ </a></span>interval()</h2>
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<dl class="section return"><dt>Returns</dt><dd>Bounding interval for an axis </dd></dl>
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<p>Implemented in <a class="el" href="class_qwt_matrix_raster_data.html#a1d8668b0d9fe4c98514e272837c2b563">QwtMatrixRasterData</a>.</p>
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<p>Pixel hint. </p>
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<p>Width and height of the hint need to be the horizontal and vertical distances between 2 neighbored points. The center of the hint has to be the position of any point ( it doesn't matter which one ).</p>
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<p>An empty hint indicates, that there are values for any detail level.</p>
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<p>Limiting the resolution of the image might significantly improve the performance and heavily reduce the amount of memory when rendering a QImage from the raster data.</p>
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<p>Reimplemented in <a class="el" href="class_qwt_matrix_raster_data.html#a8c32a3222b2b4ad15036898532e95ffa">QwtMatrixRasterData</a>.</p>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8cpp_source.html#l00267">267</a> of file <a class="el" href="qwt__raster__data_8cpp_source.html">qwt_raster_data.cpp</a>.</p>
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<p>Specify an attribute of the data</p>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8cpp_source.html#l00189">189</a> of file <a class="el" href="qwt__raster__data_8cpp_source.html">qwt_raster_data.cpp</a>.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_raster_data.html#aa9a0ea0f92af158a354421c3651fdfaf" title="Raster data attributes.">Attribute</a>, <a class="el" href="class_qwt_raster_data.html#aa4f0f8b9dcdc1f4ceef4429dd132f492">setAttribute()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__raster__data_8cpp_source.html#l00201">201</a> of file <a class="el" href="qwt__raster__data_8cpp_source.html">qwt_raster_data.cpp</a>.</p>
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<td class="memname">virtual double QwtRasterData::value </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>x</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>y</em> </td>
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<td>)</td>
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<td></td><td> const</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">pure virtual</span></span> </td>
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<dl class="section return"><dt>Returns</dt><dd>the value at a raster position </dd></dl>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">x</td><td>X value in plot coordinates </td></tr>
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<tr><td class="paramname">y</td><td>Y value in plot coordinates </td></tr>
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</dd>
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<p>Implemented in <a class="el" href="class_qwt_matrix_raster_data.html#a0629b3294f3bcfd9cc210b06eeeff6c4">QwtMatrixRasterData</a>.</p>
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<li class="navelem"><a class="el" href="class_qwt_raster_data.html">QwtRasterData</a></li>
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