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<a href="#pub-types">Public Types</a> |
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<a href="class_qwt_raster_data-members.html">List of all members</a> </div>
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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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<div class="dynheader">
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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: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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}<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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</td></tr>
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<tr class="separator:ac0053b66315fde6f0a9a69c40d7c5dcc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:adc6679160a229992f0870a2b784985f3"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="adc6679160a229992f0870a2b784985f3"></a>
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typedef QMap< double, QPolygonF > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#adc6679160a229992f0870a2b784985f3">ContourLines</a></td></tr>
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<tr class="memdesc:adc6679160a229992f0870a2b784985f3"><td class="mdescLeft"> </td><td class="mdescRight">Contour lines. <br /></td></tr>
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<tr class="separator:adc6679160a229992f0870a2b784985f3"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8101f4a0c71813d49fcdc73a457c4874"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8101f4a0c71813d49fcdc73a457c4874"></a>
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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#a8101f4a0c71813d49fcdc73a457c4874">ConrecFlags</a></td></tr>
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<tr class="memdesc:a8101f4a0c71813d49fcdc73a457c4874"><td class="mdescLeft"> </td><td class="mdescRight">Flags to modify the contour algorithm. <br /></td></tr>
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<tr class="separator:a8101f4a0c71813d49fcdc73a457c4874"><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 class="anchor" 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="separator:a0fc20e05a794c0dc85f6ae5719566588"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a95b24c7cad42c5f7947e64e990def3e8"><td class="memItemLeft" align="right" valign="top"><a class="anchor" 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:a14abf60573989e2a2c97e21a98aee558"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a14abf60573989e2a2c97e21a98aee558">setInterval</a> (Qt::Axis, const <a class="el" href="class_qwt_interval.html">QwtInterval</a> &)</td></tr>
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<tr class="separator:a14abf60573989e2a2c97e21a98aee558"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8423d051697f975150b3b555bfcac8b9"><td class="memItemLeft" align="right" valign="top">const <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#a8423d051697f975150b3b555bfcac8b9">interval</a> (Qt::Axis) const </td></tr>
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<tr class="separator:a8423d051697f975150b3b555bfcac8b9"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad1ce58351804760d1ba1e7efe97d39d6"><td class="memItemLeft" align="right" valign="top">virtual QRectF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#ad1ce58351804760d1ba1e7efe97d39d6">pixelHint</a> (const QRectF &) const </td></tr>
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<tr class="memdesc:ad1ce58351804760d1ba1e7efe97d39d6"><td class="mdescLeft"> </td><td class="mdescRight">Pixel hint. <a href="#ad1ce58351804760d1ba1e7efe97d39d6">More...</a><br /></td></tr>
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<tr class="separator:ad1ce58351804760d1ba1e7efe97d39d6"><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="#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="#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:a2ac980d656945f310143641956c67046"><td class="memItemLeft" align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a2ac980d656945f310143641956c67046">value</a> (double x, double y) const =0</td></tr>
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<tr class="separator:a2ac980d656945f310143641956c67046"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1fa90434ddeeeeaacb80657e49af8fe1"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_qwt_raster_data.html#adc6679160a229992f0870a2b784985f3">ContourLines</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#a1fa90434ddeeeeaacb80657e49af8fe1">contourLines</a> (const QRectF &rect, const QSize &raster, const QList< double > &levels, <a class="el" href="class_qwt_raster_data.html#a8101f4a0c71813d49fcdc73a457c4874">ConrecFlags</a>) const </td></tr>
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<tr class="separator:a1fa90434ddeeeeaacb80657e49af8fe1"><td class="memSeparator" colspan="2"> </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>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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</div><h2 class="groupheader">Member Enumeration Documentation</h2>
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<a class="anchor" id="ac0053b66315fde6f0a9a69c40d7c5dcc"></a>
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<div class="memitem">
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<div class="memproto">
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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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</div><div class="memdoc">
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<p>Flags to modify the contour algorithm. </p>
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<table class="fieldtable">
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a class="anchor" id="ac0053b66315fde6f0a9a69c40d7c5dccafd2f6337e825201a247408f033713c92"></a>IgnoreAllVerticesOnLevel </td><td class="fielddoc">
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<p>Ignore all vertices on the same level. </p>
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</td></tr>
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<tr><td class="fieldname"><a class="anchor" id="ac0053b66315fde6f0a9a69c40d7c5dcca18e8d1de171dd43cc957c279eb03d32c"></a>IgnoreOutOfRange </td><td class="fielddoc">
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<p>Ignore all values, that are out of range. </p>
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</td></tr>
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</table>
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</div>
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</div>
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<h2 class="groupheader">Member Function Documentation</h2>
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<a class="anchor" id="a1fa90434ddeeeeaacb80657e49af8fe1"></a>
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<td class="memname"><a class="el" href="class_qwt_raster_data.html#adc6679160a229992f0870a2b784985f3">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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<td class="paramname"><em>rect</em>, </td>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const QSize & </td>
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<td class="paramname"><em>raster</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const QList< double > & </td>
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<td class="paramname"><em>levels</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="class_qwt_raster_data.html#a8101f4a0c71813d49fcdc73a457c4874">ConrecFlags</a> </td>
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<td class="paramname"><em>flags</em> </td>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td> const</td>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">virtual</span></span> </td>
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</div><div class="memdoc">
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<p>Calculate contour lines</p>
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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">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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<tr><td class="paramname">flags</td><td>Flags to customize the contouring algorithm</td></tr>
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</table>
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</dd>
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</dl>
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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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<td class="memname">void QwtRasterData::discardRaster </td>
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<td>(</td>
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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#a2ac980d656945f310143641956c67046">value()</a> </dd></dl>
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<td class="memname">void QwtRasterData::initRaster </td>
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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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<table class="params">
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<tr><td class="paramname">area</td><td>Area of the raster </td></tr>
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<tr><td class="paramname">raster</td><td>Number of horizontal and vertical pixels</td></tr>
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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#a2ac980d656945f310143641956c67046">value()</a> </dd></dl>
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<td class="memname">const <a class="el" href="class_qwt_interval.html">QwtInterval</a> & QwtRasterData::interval </td>
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<dl class="section return"><dt>Returns</dt><dd>Bounding interval for a axis </dd></dl>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_raster_data.html#a14abf60573989e2a2c97e21a98aee558">setInterval</a> </dd></dl>
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<p>Pixel hint. </p>
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<p><a class="el" href="class_qwt_raster_data.html#ad1ce58351804760d1ba1e7efe97d39d6" title="Pixel hint. ">pixelHint()</a> returns the geometry of a pixel, that can be used to calculate the resolution and alignment of the plot item, that is representing the data.</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>The default implementation returns an empty rectangle recommending to render in target device ( f.e. screen ) resolution.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<dl class="section return"><dt>Returns</dt><dd>Bounding rectangle of a pixel </dd></dl>
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<p>Reimplemented in <a class="el" href="class_qwt_matrix_raster_data.html#a7a9034de8037af500e4f737f54591358">QwtMatrixRasterData</a>.</p>
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<td class="memname">void QwtRasterData::setInterval </td>
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<p>Set the bounding interval for the x, y or z coordinates.</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#a8423d051697f975150b3b555bfcac8b9">interval()</a> </dd></dl>
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<p>Reimplemented in <a class="el" href="class_qwt_matrix_raster_data.html#a69db38d8f920edb9dc3f0953ca16db8f">QwtMatrixRasterData</a>.</p>
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<td class="memname">virtual double QwtRasterData::value </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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<tr><td class="paramname">x</td><td>X value in plot coordinates </td></tr>
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<p>Implemented in <a class="el" href="class_qwt_matrix_raster_data.html#a49952670063166bccdbfb9cdbd7b56e8">QwtMatrixRasterData</a>.</p>
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