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<title>Qwt User's Guide: QwtRasterData Class Reference</title>
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<li><a href="classes.html"><span>Alphabetical List</span></a></li>
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<li><a href="annotated.html"><span>Class List</span></a></li>
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<h1>QwtRasterData Class Reference</h1><!-- doxytag: class="QwtRasterData" -->Inheritance diagram for QwtRasterData:<p><center><img src="class_qwt_raster_data__inherit__graph.png" border="0" usemap="#_qwt_raster_data__inherit__map" alt="Inheritance graph"></center>
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<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="class_qwt_raster_data-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
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<a class="el" href="class_qwt_raster_data.html">QwtRasterData</a> defines an interface to any type of raster data.
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Definition at line <a class="el" href="qwt__raster__data_8h-source.html#l00053">53</a> of file <a class="el" href="qwt__raster__data_8h-source.html">qwt_raster_data.h</a>.<table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#8be376c4015dcb4adc207316bccf1140">ConrecAttribute</a> { <br>
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<b>IgnoreAllVerticesOnLevel</b> = 1,
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<b>IgnoreOutOfRange</b> = 2
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="dc6679160a229992f0870a2b784985f3"></a><!-- doxytag: member="QwtRasterData::ContourLines" ref="dc6679160a229992f0870a2b784985f3" args="" -->
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typedef QMap< double, QPolygonF > </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#dc6679160a229992f0870a2b784985f3">ContourLines</a></td></tr>
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<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0fc20e05a794c0dc85f6ae5719566588"></a><!-- doxytag: member="QwtRasterData::QwtRasterData" ref="0fc20e05a794c0dc85f6ae5719566588" args="()" -->
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</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#0fc20e05a794c0dc85f6ae5719566588">QwtRasterData</a> ()</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="6bc4af46167b65d2b6eb69d03b87715a"></a><!-- doxytag: member="QwtRasterData::QwtRasterData" ref="6bc4af46167b65d2b6eb69d03b87715a" args="(const QwtDoubleRect &)" -->
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</td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#6bc4af46167b65d2b6eb69d03b87715a">QwtRasterData</a> (const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> &)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="95b24c7cad42c5f7947e64e990def3e8"></a><!-- doxytag: member="QwtRasterData::~QwtRasterData" ref="95b24c7cad42c5f7947e64e990def3e8" args="()" -->
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virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#95b24c7cad42c5f7947e64e990def3e8">~QwtRasterData</a> ()</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="class_qwt_raster_data.html">QwtRasterData</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#6fb61a7458f7a34f871f765f2b9d4eae">copy</a> () const=0</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="88ec1da25b0beaa9530dd039791399fb"></a><!-- doxytag: member="QwtRasterData::setBoundingRect" ref="88ec1da25b0beaa9530dd039791399fb" args="(const QwtDoubleRect &)" -->
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virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#88ec1da25b0beaa9530dd039791399fb">setBoundingRect</a> (const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> &)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="bcd512d7fc6b042e21aa20501a4ac12d"></a><!-- doxytag: member="QwtRasterData::boundingRect" ref="bcd512d7fc6b042e21aa20501a4ac12d" args="() const" -->
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<a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#bcd512d7fc6b042e21aa20501a4ac12d">boundingRect</a> () const</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual QSize </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#07359cae6d521c3589acc3c8100e9964">rasterHint</a> (const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> &) const</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#8405182366702abc965a2f938ccf1f14">initRaster</a> (const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> &, const QSize &raster)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#369a5f525814bf569e01f88fbd8ddb5b">discardRaster</a> ()</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#56f816e86f763e481d41ae0cb5106869">value</a> (double x, double y) const=0</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#95b3861eed67368d580395e2c1a596c4">range</a> () const=0</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="class_qwt_raster_data.html#dc6679160a229992f0870a2b784985f3">ContourLines</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#aa736252a4fa41dec93599a6207124d5">contourLines</a> (const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> &rect, const QSize &raster, const QList< double > &levels, int flags) const</td></tr>
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<hr><h2>Member Function Documentation</h2>
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<a class="anchor" name="6fb61a7458f7a34f871f765f2b9d4eae"></a><!-- doxytag: member="QwtRasterData::copy" ref="6fb61a7458f7a34f871f765f2b9d4eae" args="() const=0" -->
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<td class="memname">virtual <a class="el" href="class_qwt_raster_data.html">QwtRasterData</a>* QwtRasterData::copy </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"> const<code> [pure virtual]</code></td>
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Referenced by <a class="el" href="qwt__plot__spectrogram_8cpp-source.html#l00342">QwtPlotSpectrogram::setData()</a>.
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<a class="anchor" name="07359cae6d521c3589acc3c8100e9964"></a><!-- doxytag: member="QwtRasterData::rasterHint" ref="07359cae6d521c3589acc3c8100e9964" args="(const QwtDoubleRect &) const" -->
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<td class="memname">QSize QwtRasterData::rasterHint </td>
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<td class="paramtype">const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> & </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"> const<code> [virtual]</code></td>
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Find the raster of the data for an area.
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The resolution is the number of horizontal and vertical pixels that the data can return for an area. An invalid resolution indicates that the data can return values for any detail level.<p>
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The resolution will limit the size of the image that is rendered from the data. F.e. this might be important when printing a spectrogram to a A0 printer with 600 dpi.<p>
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The default implementation returns an invalid resolution (size)<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>rect</em> </td><td>In most implementations the resolution of the data doesn't depend on the requested rectangle.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>Resolution, as number of horizontal and vertical pixels </dd></dl>
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Definition at line <a class="el" href="qwt__raster__data_8cpp-source.html#l00258">258</a> of file <a class="el" href="qwt__raster__data_8cpp-source.html">qwt_raster_data.cpp</a>.
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<a class="anchor" name="8405182366702abc965a2f938ccf1f14"></a><!-- doxytag: member="QwtRasterData::initRaster" ref="8405182366702abc965a2f938ccf1f14" args="(const QwtDoubleRect &, const QSize &raster)" -->
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<td class="memname">void QwtRasterData::initRaster </td>
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<td class="paramtype">const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> & </td>
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<td class="paramname">, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const QSize & </td>
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<td class="paramname"> <em>raster</em></td><td> </td>
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<td></td><td></td><td width="100%"><code> [virtual]</code></td>
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Before the composition of an image <a class="el" href="class_qwt_plot_spectrogram.html">QwtPlotSpectrogram</a> calls initRaster, announcing the area and its resolution that will be requested.<p>
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The default implementation does nothing, but for data sets that are stored in files, it might be good idea to reimplement initRaster, where the data is resampled and loaded into memory.<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>rect</em> </td><td>Area of the raster </td></tr>
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<tr><td valign="top"></td><td valign="top"><em>raster</em> </td><td>Number of horizontal and vertical pixels</td></tr>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_raster_data.html#8405182366702abc965a2f938ccf1f14">initRaster()</a>, <a class="el" href="class_qwt_raster_data.html#56f816e86f763e481d41ae0cb5106869">value()</a> </dd></dl>
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Definition at line <a class="el" href="qwt__raster__data_8cpp-source.html#l00222">222</a> of file <a class="el" href="qwt__raster__data_8cpp-source.html">qwt_raster_data.cpp</a>.
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<a class="anchor" name="369a5f525814bf569e01f88fbd8ddb5b"></a><!-- doxytag: member="QwtRasterData::discardRaster" ref="369a5f525814bf569e01f88fbd8ddb5b" args="()" -->
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<td class="memname">void QwtRasterData::discardRaster </td>
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<td class="paramname"> </td>
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<td> ) </td>
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<td width="100%"><code> [virtual]</code></td>
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After the composition of an image <a class="el" href="class_qwt_plot_spectrogram.html">QwtPlotSpectrogram</a> calls <a class="el" href="class_qwt_raster_data.html#369a5f525814bf569e01f88fbd8ddb5b">discardRaster()</a>.<p>
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The default implementation does nothing, but if data has been loaded in <a class="el" href="class_qwt_raster_data.html#8405182366702abc965a2f938ccf1f14">initRaster()</a>, it could deleted now.<p>
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<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_raster_data.html#8405182366702abc965a2f938ccf1f14">initRaster()</a>, <a class="el" href="class_qwt_raster_data.html#56f816e86f763e481d41ae0cb5106869">value()</a> </dd></dl>
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Definition at line <a class="el" href="qwt__raster__data_8cpp-source.html#l00236">236</a> of file <a class="el" href="qwt__raster__data_8cpp-source.html">qwt_raster_data.cpp</a>.
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<a class="anchor" name="56f816e86f763e481d41ae0cb5106869"></a><!-- doxytag: member="QwtRasterData::value" ref="56f816e86f763e481d41ae0cb5106869" args="(double x, double y) const=0" -->
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<td class="memname">virtual double QwtRasterData::value </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="paramtype">double </td>
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<td class="paramname"> <em>y</em></td><td> </td>
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<td></td><td></td><td width="100%"> const<code> [pure virtual]</code></td>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the value at a raster position </dd></dl>
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<a class="anchor" name="95b3861eed67368d580395e2c1a596c4"></a><!-- doxytag: member="QwtRasterData::range" ref="95b3861eed67368d580395e2c1a596c4" args="() const=0" -->
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<td class="memname">virtual <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> QwtRasterData::range </td>
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<td> ) </td>
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<td width="100%"> const<code> [pure virtual]</code></td>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the range of the values </dd></dl>
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<a class="anchor" name="aa736252a4fa41dec93599a6207124d5"></a><!-- doxytag: member="QwtRasterData::contourLines" ref="aa736252a4fa41dec93599a6207124d5" args="(const QwtDoubleRect &rect, const QSize &raster, const QList< double > &levels, int flags) const" -->
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<td class="memname"><a class="el" href="class_qwt_raster_data.html#dc6679160a229992f0870a2b784985f3">QwtRasterData::ContourLines</a> QwtRasterData::contourLines </td>
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<td class="paramtype">const <a class="el" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> & </td>
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<td class="paramname"> <em>rect</em>, </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="paramtype">const QList< double > & </td>
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<td class="paramname"> <em>levels</em>, </td>
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<td class="paramtype">int </td>
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<td class="paramname"> <em>flags</em></td><td> </td>
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<td></td><td></td><td width="100%"> const<code> [virtual]</code></td>
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Calculate contour lines<p>
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An adaption of CONREC, a simple contouring algorithm. <a href="http://astronomy.swin.edu.au/~pbourke/projection/conrec">http://astronomy.swin.edu.au/~pbourke/projection/conrec</a>
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Definition at line <a class="el" href="qwt__raster__data_8cpp-source.html#l00270">270</a> of file <a class="el" href="qwt__raster__data_8cpp-source.html">qwt_raster_data.cpp</a>.
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References <a class="el" href="qwt__double__interval_8cpp-source.html#l00054">QwtDoubleInterval::contains()</a>, and <a class="el" href="qwt__double__interval_8h-source.html#l00200">QwtDoubleInterval::isValid()</a>.
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