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<h1>QwtRasterData Class Reference</h1><!-- doxytag: class="QwtRasterData" --><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.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="qwt__raster__data_8h-source.html">qwt_raster_data.h</a>></code>
<p>
<div class="dynheader">
Inheritance diagram for QwtRasterData:</div>
<div class="dynsection">
<p><center><img src="class_qwt_raster_data__inherit__graph.png" border="0" usemap="#_qwt_raster_data__inherit__map" alt="Inheritance graph"></center>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
<p>
<a href="class_qwt_raster_data-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<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>
<b>IgnoreAllVerticesOnLevel</b> = 1,
<br>
<b>IgnoreOutOfRange</b> = 2
<br>
}</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="dc6679160a229992f0870a2b784985f3"></a><!-- doxytag: member="QwtRasterData::ContourLines" ref="dc6679160a229992f0870a2b784985f3" args="" -->
typedef QMap< double, QPolygonF > </td><td class="memItemRight" valign="bottom"><b>ContourLines</b></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#0fc20e05a794c0dc85f6ae5719566588">QwtRasterData</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#6bc4af46167b65d2b6eb69d03b87715a">QwtRasterData</a> (const QwtDoubleRect &)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#95b24c7cad42c5f7947e64e990def3e8">~QwtRasterData</a> ()</td></tr>
<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>
<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#88ec1da25b0beaa9530dd039791399fb">setBoundingRect</a> (const QwtDoubleRect &)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QwtDoubleRect </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_raster_data.html#2e730c7b31507bb66379f64af3468a25">boundingRect</a> () const </td></tr>
<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>
<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>
<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>
<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>
<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>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual ContourLines </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>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<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>
<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>
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 ). <hr><h2>Member Enumeration Documentation</h2>
<a class="anchor" name="8be376c4015dcb4adc207316bccf1140"></a><!-- doxytag: member="QwtRasterData::ConrecAttribute" ref="8be376c4015dcb4adc207316bccf1140" args="" -->
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<td class="memname">enum <a class="el" href="class_qwt_raster_data.html#8be376c4015dcb4adc207316bccf1140">QwtRasterData::ConrecAttribute</a> </td>
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<p>
Attribute to modify the contour algorithm.
<p>
</div>
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<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="0fc20e05a794c0dc85f6ae5719566588"></a><!-- doxytag: member="QwtRasterData::QwtRasterData" ref="0fc20e05a794c0dc85f6ae5719566588" args="()" -->
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<td class="memname">QwtRasterData::QwtRasterData </td>
<td>(</td>
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<p>
Constructor.
<p>
</div>
</div><p>
<a class="anchor" name="6bc4af46167b65d2b6eb69d03b87715a"></a><!-- doxytag: member="QwtRasterData::QwtRasterData" ref="6bc4af46167b65d2b6eb69d03b87715a" args="(const QwtDoubleRect &)" -->
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<td class="memname">QwtRasterData::QwtRasterData </td>
<td>(</td>
<td class="paramtype">const QwtDoubleRect & </td>
<td class="paramname"> <em>boundingRect</em> </td>
<td> ) </td>
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<p>
Constructor<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>boundingRect</em> </td><td>Bounding rectangle </td></tr>
</table>
</dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_raster_data.html#88ec1da25b0beaa9530dd039791399fb">setBoundingRect()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="95b24c7cad42c5f7947e64e990def3e8"></a><!-- doxytag: member="QwtRasterData::~QwtRasterData" ref="95b24c7cad42c5f7947e64e990def3e8" args="()" -->
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<td class="memname">QwtRasterData::~QwtRasterData </td>
<td>(</td>
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<td> ) </td>
<td><code> [virtual]</code></td>
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<p>
Destructor.
<p>
</div>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="2e730c7b31507bb66379f64af3468a25"></a><!-- doxytag: member="QwtRasterData::boundingRect" ref="2e730c7b31507bb66379f64af3468a25" args="() const " -->
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<td class="memname">QwtDoubleRect QwtRasterData::boundingRect </td>
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<td class="paramname"> </td>
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<td> const</td>
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<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Bounding rectangle </dd></dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_raster_data.html#2e730c7b31507bb66379f64af3468a25">boundingRect()</a> </dd></dl>
</div>
</div><p>
<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 " -->
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<td class="memname">QwtRasterData::ContourLines QwtRasterData::contourLines </td>
<td>(</td>
<td class="paramtype">const QwtDoubleRect & </td>
<td class="paramname"> <em>rect</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const QSize & </td>
<td class="paramname"> <em>raster</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const QList< double > & </td>
<td class="paramname"> <em>levels</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>flags</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [virtual]</code></td>
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<p>
Calculate contour lines<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>
</div>
</div><p>
<a class="anchor" name="6abfdbd4707ca4095ed6b51584a5c504"></a><!-- doxytag: member="QwtRasterData::copy" ref="6abfdbd4707ca4095ed6b51584a5c504" 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>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [pure virtual]</code></td>
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<p>
Clone the data.
<p>
</div>
</div><p>
<a class="anchor" name="369a5f525814bf569e01f88fbd8ddb5b"></a><!-- doxytag: member="QwtRasterData::discardRaster" ref="369a5f525814bf569e01f88fbd8ddb5b" args="()" -->
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<td class="memname">void QwtRasterData::discardRaster </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<p>
Discard a raster.
<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#369a5f525814bf569e01f88fbd8ddb5b" title="Discard a raster.">discardRaster()</a>.<p>
The default implementation does nothing, but if data has been loaded in <a class="el" href="class_qwt_raster_data.html#8405182366702abc965a2f938ccf1f14" title="Initialize a raster.">initRaster()</a>, it could deleted now.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_raster_data.html#8405182366702abc965a2f938ccf1f14" title="Initialize a raster.">initRaster()</a>, <a class="el" href="class_qwt_raster_data.html#6396fc013fcec893b1e8cea4cf03691e">value()</a> </dd></dl>
</div>
</div><p>
<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>
<td>(</td>
<td class="paramtype">const QwtDoubleRect & </td>
<td class="paramname">, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const QSize & </td>
<td class="paramname"> <em>raster</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [virtual]</code></td>
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<p>
Initialize a raster.
<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 initRaster, announcing the area and its resolution that will be requested.<p>
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>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>rect</em> </td><td>Area of the raster </td></tr>
<tr><td valign="top"></td><td valign="top"><em>raster</em> </td><td>Number of horizontal and vertical pixels</td></tr>
</table>
</dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_raster_data.html#8405182366702abc965a2f938ccf1f14" title="Initialize a raster.">initRaster()</a>, <a class="el" href="class_qwt_raster_data.html#6396fc013fcec893b1e8cea4cf03691e">value()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="6c282a2457d2307d26afe9b84cc0b775"></a><!-- doxytag: member="QwtRasterData::range" ref="6c282a2457d2307d26afe9b84cc0b775" 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>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [pure virtual]</code></td>
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<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the range of the values </dd></dl>
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</div><p>
<a class="anchor" name="81e17cbcf24c941526088e6458ba347f"></a><!-- doxytag: member="QwtRasterData::rasterHint" ref="81e17cbcf24c941526088e6458ba347f" args="(const QwtDoubleRect &) const " -->
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<td class="memname">QSize QwtRasterData::rasterHint </td>
<td>(</td>
<td class="paramtype">const QwtDoubleRect & </td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [virtual]</code></td>
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<p>
Find the raster of the data for an area.
<p>
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>
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>
The default implementation returns an invalid resolution (size)<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<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>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Resolution, as number of horizontal and vertical pixels </dd></dl>
</div>
</div><p>
<a class="anchor" name="88ec1da25b0beaa9530dd039791399fb"></a><!-- doxytag: member="QwtRasterData::setBoundingRect" ref="88ec1da25b0beaa9530dd039791399fb" args="(const QwtDoubleRect &)" -->
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<td class="memname">void QwtRasterData::setBoundingRect </td>
<td>(</td>
<td class="paramtype">const QwtDoubleRect & </td>
<td class="paramname"> <em>boundingRect</em> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<p>
Set the bounding rect ( == area, un plot coordinates )<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>boundingRect</em> </td><td>Bounding rectangle </td></tr>
</table>
</dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_raster_data.html#2e730c7b31507bb66379f64af3468a25">boundingRect()</a> </dd></dl>
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</div><p>
<a class="anchor" name="6396fc013fcec893b1e8cea4cf03691e"></a><!-- doxytag: member="QwtRasterData::value" ref="6396fc013fcec893b1e8cea4cf03691e" args="(double x, double y) const =0" -->
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<td class="memname">virtual double QwtRasterData::value </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"> <em>x</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>y</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td> const<code> [pure virtual]</code></td>
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<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the value at a raster position </dd></dl>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>x</em> </td><td>X value in plot coordinates </td></tr>
<tr><td valign="top"></td><td valign="top"><em>y</em> </td><td>Y value in plot coordinates </td></tr>
</table>
</dl>
</div>
</div><p>
</div>
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