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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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<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"><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 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 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 QwtDoubleRect &)</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#6abfdbd4707ca4095ed6b51584a5c504">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 QwtDoubleRect &)</td></tr>
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2e730c7b31507bb66379f64af3468a25"></a><!-- doxytag: member="QwtRasterData::boundingRect" ref="2e730c7b31507bb66379f64af3468a25" args="() const " -->
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QwtDoubleRect </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#2e730c7b31507bb66379f64af3468a25">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#81e17cbcf24c941526088e6458ba347f">rasterHint</a> (const QwtDoubleRect &) 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 QwtDoubleRect &, 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#6396fc013fcec893b1e8cea4cf03691e">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#6c282a2457d2307d26afe9b84cc0b775">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#5e62b72075c01a6be21a7d93b8c934d6">contourLines</a> (const QwtDoubleRect &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="5e62b72075c01a6be21a7d93b8c934d6"></a><!-- doxytag: member="QwtRasterData::contourLines" ref="5e62b72075c01a6be21a7d93b8c934d6" args="(const QwtDoubleRect &rect, const QSize &raster, const QList< double > &levels, int flags) const " --><p>
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<table class="mdTable" cellpadding="2" cellspacing="0">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"><a class="el" href="class_qwt_raster_data.html#dc6679160a229992f0870a2b784985f3">QwtRasterData::ContourLines</a> QwtRasterData::contourLines </td>
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<td class="md" valign="top">( </td>
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<td class="md" nowrap valign="top">const QwtDoubleRect & </td>
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<td class="mdname" nowrap> <em>rect</em>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>const QSize & </td>
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<td class="mdname" nowrap> <em>raster</em>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>const QList< double > & </td>
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<td class="mdname" nowrap> <em>levels</em>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>int </td>
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<td class="mdname" nowrap> <em>flags</em></td>
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<td class="md">) </td>
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<td class="md" colspan="2"> 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_8h-source.html#l00200">QwtDoubleInterval::isValid()</a>. </td>
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<a class="anchor" name="6abfdbd4707ca4095ed6b51584a5c504"></a><!-- doxytag: member="QwtRasterData::copy" ref="6abfdbd4707ca4095ed6b51584a5c504" args="() const =0" --><p>
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<td class="md" nowrap valign="top">virtual <a class="el" href="class_qwt_raster_data.html">QwtRasterData</a>* QwtRasterData::copy </td>
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<td class="md" valign="top">( </td>
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<td class="mdname1" valign="top" nowrap> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap> 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>. </td>
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<a class="anchor" name="369a5f525814bf569e01f88fbd8ddb5b"></a><!-- doxytag: member="QwtRasterData::discardRaster" ref="369a5f525814bf569e01f88fbd8ddb5b" args="()" --><p>
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<table class="mdTable" cellpadding="2" cellspacing="0">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">void QwtRasterData::discardRaster </td>
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<td class="md" valign="top">( </td>
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<td class="mdname1" valign="top" nowrap> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap><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 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#6396fc013fcec893b1e8cea4cf03691e">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>. </td>
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<a class="anchor" name="8405182366702abc965a2f938ccf1f14"></a><!-- doxytag: member="QwtRasterData::initRaster" ref="8405182366702abc965a2f938ccf1f14" args="(const QwtDoubleRect &, const QSize &raster)" --><p>
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<table class="mdTable" cellpadding="2" cellspacing="0">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">void QwtRasterData::initRaster </td>
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<td class="md" valign="top">( </td>
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<td class="md" nowrap valign="top">const QwtDoubleRect & </td>
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<td class="mdname" nowrap>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>const QSize & </td>
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<td class="mdname" nowrap> <em>raster</em></td>
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<td class="md">) </td>
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<td class="md" colspan="2"><code> [virtual]</code></td>
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<table cellspacing="5" cellpadding="0" border="0">
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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 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#6396fc013fcec893b1e8cea4cf03691e">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>. </td>
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<a class="anchor" name="6c282a2457d2307d26afe9b84cc0b775"></a><!-- doxytag: member="QwtRasterData::range" ref="6c282a2457d2307d26afe9b84cc0b775" args="() const =0" --><p>
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<td class="md" nowrap valign="top">virtual <a class="el" href="class_qwt_double_interval.html">QwtDoubleInterval</a> QwtRasterData::range </td>
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<td class="md" valign="top">( </td>
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<td class="mdname1" valign="top" nowrap> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap> const<code> [pure virtual]</code></td>
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<table cellspacing="5" cellpadding="0" border="0">
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<dl compact><dt><b>Returns:</b></dt><dd>the range of the values </dd></dl>
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<a class="anchor" name="81e17cbcf24c941526088e6458ba347f"></a><!-- doxytag: member="QwtRasterData::rasterHint" ref="81e17cbcf24c941526088e6458ba347f" args="(const QwtDoubleRect &) const " --><p>
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<table class="mdTable" cellpadding="2" cellspacing="0">
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">QSize QwtRasterData::rasterHint </td>
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<td class="md" valign="top">( </td>
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<td class="md" nowrap valign="top">const QwtDoubleRect & </td>
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<td class="mdname1" valign="top" nowrap> </td>
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<td class="md" valign="top"> ) </td>
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<td class="md" nowrap> const<code> [virtual]</code></td>
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<table cellspacing="5" cellpadding="0" border="0">
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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 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>. </td>
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<a class="anchor" name="6396fc013fcec893b1e8cea4cf03691e"></a><!-- doxytag: member="QwtRasterData::value" ref="6396fc013fcec893b1e8cea4cf03691e" args="(double x, double y) const =0" --><p>
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<td class="md" nowrap valign="top">virtual double QwtRasterData::value </td>
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<td class="md" valign="top">( </td>
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<td class="md" nowrap valign="top">double </td>
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<td class="mdname" nowrap> <em>x</em>, </td>
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<td class="md" nowrap align="right"></td>
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<td class="md" nowrap>double </td>
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<td class="mdname" nowrap> <em>y</em></td>
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<td class="md">) </td>
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<td class="md" colspan="2"> const<code> [pure virtual]</code></td>
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<table cellspacing="5" cellpadding="0" border="0">
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<dl compact><dt><b>Returns:</b></dt><dd>the value at a raster position </dd></dl>
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<hr size="1"><address style="align: right;"><small>Generated on Mon Jun 11 07:42:49 2007 for Qwt User's Guide by
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<a href="http://www.doxygen.org/index.html">
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>
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