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<title>Qwt User's Guide: QwtDialNeedle Class Reference</title>
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<h1>QwtDialNeedle Class Reference</h1><!-- doxytag: class="QwtDialNeedle" -->Base class for needles that can be used in a <a class="el" href="class_qwt_dial.html" title="QwtDial class provides a rounded range control.">QwtDial</a>.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="qwt__dial__needle_8h-source.html">qwt_dial_needle.h</a>></code>
<p>
<div class="dynheader">
Inheritance diagram for QwtDialNeedle:</div>
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<p><center><img src="class_qwt_dial_needle__inherit__graph.png" border="0" usemap="#_qwt_dial_needle__inherit__map" alt="Inheritance graph"></center>
<map name="_qwt_dial_needle__inherit__map">
<area shape="rect" href="class_qwt_compass_magnet_needle.html" title="A magnet needle for compass widgets." alt="" coords="7,83,193,107"><area shape="rect" href="class_qwt_compass_wind_arrow.html" title="An indicator for the wind direction." alt="" coords="217,83,385,107"><area shape="rect" href="class_qwt_dial_simple_needle.html" title="A needle for dial widgets." alt="" coords="409,83,561,107"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
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<a href="class_qwt_dial_needle-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 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_dial_needle.html#ef3af79632ce784bc4d7332f6e269a1f">QwtDialNeedle</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_dial_needle.html#c23b2af4af50042967c8cea87b474247">~QwtDialNeedle</a> ()</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_dial_needle.html#6076eecfa9fc39235435d098cf146a2c">draw</a> (QPainter *painter, const QPoint &center, int length, double direction, QPalette::ColorGroup cg=QPalette::Active) 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_dial_needle.html#e850883a64501136bca64d6ea2d084b9">setPalette</a> (const QPalette &)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">const QPalette & </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_dial_needle.html#8b3c915032389261e07cc983b433166c">palette</a> () const </td></tr>
<tr><td colspan="2"><br><h2>Static Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_dial_needle.html#5ff7738a4ce55551b0949a55b145662f">drawKnob</a> (QPainter *, const QPoint &pos, int width, const QBrush &, bool sunken)</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Base class for needles that can be used in a <a class="el" href="class_qwt_dial.html" title="QwtDial class provides a rounded range control.">QwtDial</a>.
<p>
<a class="el" href="class_qwt_dial_needle.html" title="Base class for needles that can be used in a QwtDial.">QwtDialNeedle</a> is a pointer that indicates a value by pointing to a specific direction.<p>
Qwt is missing a set of good looking needles. Contributions are very welcome.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_dial.html" title="QwtDial class provides a rounded range control.">QwtDial</a>, <a class="el" href="class_qwt_compass.html" title="A Compass Widget.">QwtCompass</a> </dd></dl>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="ef3af79632ce784bc4d7332f6e269a1f"></a><!-- doxytag: member="QwtDialNeedle::QwtDialNeedle" ref="ef3af79632ce784bc4d7332f6e269a1f" args="()" -->
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<td class="memname">QwtDialNeedle::QwtDialNeedle </td>
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<p>
Constructor.
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<a class="anchor" name="c23b2af4af50042967c8cea87b474247"></a><!-- doxytag: member="QwtDialNeedle::~QwtDialNeedle" ref="c23b2af4af50042967c8cea87b474247" args="()" -->
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<td class="memname">QwtDialNeedle::~QwtDialNeedle </td>
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<td class="paramname"> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
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<p>
Destructor.
<p>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="6076eecfa9fc39235435d098cf146a2c"></a><!-- doxytag: member="QwtDialNeedle::draw" ref="6076eecfa9fc39235435d098cf146a2c" args="(QPainter *painter, const QPoint &center, int length, double direction, QPalette::ColorGroup cg=QPalette::Active) const =0" -->
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<td class="memname">virtual void QwtDialNeedle::draw </td>
<td>(</td>
<td class="paramtype">QPainter * </td>
<td class="paramname"> <em>painter</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const QPoint & </td>
<td class="paramname"> <em>center</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>length</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>direction</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">QPalette::ColorGroup </td>
<td class="paramname"> <em>cg</em> = <code>QPalette::Active</code></td><td> </td>
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<td>)</td>
<td></td><td></td><td> const<code> [pure virtual]</code></td>
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<p>
Draw the needle<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>painter</em> </td><td>Painter </td></tr>
<tr><td valign="top"></td><td valign="top"><em>center</em> </td><td>Center of the dial, start position for the needle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>length</em> </td><td>Length of the needle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>direction</em> </td><td>Direction of the needle, in degrees counter clockwise </td></tr>
<tr><td valign="top"></td><td valign="top"><em>cg</em> </td><td>Color group, used for painting </td></tr>
</table>
</dl>
<p>Implemented in <a class="el" href="class_qwt_dial_simple_needle.html#e5b090bd9bbbe0d1a21c02058b8a3539">QwtDialSimpleNeedle</a>, <a class="el" href="class_qwt_compass_magnet_needle.html#5f70372a381eb8953728def1a5cb8bc2">QwtCompassMagnetNeedle</a>, and <a class="el" href="class_qwt_compass_wind_arrow.html#a3a2d79d2934205501a92a9c198e3d8a">QwtCompassWindArrow</a>.</p>
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<a class="anchor" name="5ff7738a4ce55551b0949a55b145662f"></a><!-- doxytag: member="QwtDialNeedle::drawKnob" ref="5ff7738a4ce55551b0949a55b145662f" args="(QPainter *, const QPoint &pos, int width, const QBrush &, bool sunken)" -->
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<td class="memname">void QwtDialNeedle::drawKnob </td>
<td>(</td>
<td class="paramtype">QPainter * </td>
<td class="paramname"> <em>painter</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const QPoint & </td>
<td class="paramname"> <em>pos</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>width</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const QBrush & </td>
<td class="paramname"> <em>brush</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>sunken</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td><code> [static, protected]</code></td>
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<p>
Draw the knob.
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<a class="anchor" name="8b3c915032389261e07cc983b433166c"></a><!-- doxytag: member="QwtDialNeedle::palette" ref="8b3c915032389261e07cc983b433166c" args="() const " -->
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<td class="memname">const QPalette & QwtDialNeedle::palette </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const</td>
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<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the palette of the needle. </dd></dl>
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<a class="anchor" name="e850883a64501136bca64d6ea2d084b9"></a><!-- doxytag: member="QwtDialNeedle::setPalette" ref="e850883a64501136bca64d6ea2d084b9" args="(const QPalette &)" -->
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<td class="memname">void QwtDialNeedle::setPalette </td>
<td>(</td>
<td class="paramtype">const QPalette & </td>
<td class="paramname"> <em>palette</em> </td>
<td> ) </td>
<td><code> [virtual]</code></td>
</tr>
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<p>
Sets the palette for the needle.<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>palette</em> </td><td>New Palette </td></tr>
</table>
</dl>
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