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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
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+<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qdial.cpp:86 -->
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>QDial Class</title>
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+<table border="0" cellpadding="0" cellspacing="0" width="100%">
+<tr bgcolor="#E5E5E5">
+<td valign=center>
+ <a href="index.html">
+<font color="#004faf">Home</font></a>
+ | <a href="classes.html">
+<font color="#004faf">All&nbsp;Classes</font></a>
+ | <a href="mainclasses.html">
+<font color="#004faf">Main&nbsp;Classes</font></a>
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+<font color="#004faf">Annotated</font></a>
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+<font color="#004faf">Grouped&nbsp;Classes</font></a>
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+<font color="#004faf">Functions</font></a>
+</td>
+<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QDial Class Reference</h1>
+
+<p>The QDial class provides a rounded range control (like a speedometer or potentiometer).
+<a href="#details">More...</a>
+<p><tt>#include &lt;<a href="qdial-h.html">qdial.h</a>&gt;</tt>
+<p>Inherits <a href="qwidget.html">QWidget</a> and <a href="qrangecontrol.html">QRangeControl</a>.
+<p><a href="qdial-members.html">List of all member functions.</a>
+<h2>Public Members</h2>
+<ul>
+<li class=fn><a href="#QDial"><b>QDial</b></a> ( QWidget&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0, WFlags&nbsp;f = 0 )</li>
+<li class=fn><a href="#QDial-2"><b>QDial</b></a> ( int&nbsp;minValue, int&nbsp;maxValue, int&nbsp;pageStep, int&nbsp;value, QWidget&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0 )</li>
+<li class=fn><a href="#~QDial"><b>~QDial</b></a> ()</li>
+<li class=fn>bool <a href="#tracking"><b>tracking</b></a> () const</li>
+<li class=fn>bool <a href="#wrapping"><b>wrapping</b></a> () const</li>
+<li class=fn>int <a href="#notchSize"><b>notchSize</b></a> () const</li>
+<li class=fn>virtual void <a href="#setNotchTarget"><b>setNotchTarget</b></a> ( double )</li>
+<li class=fn>double <a href="#notchTarget"><b>notchTarget</b></a> () const</li>
+<li class=fn>bool <a href="#notchesVisible"><b>notchesVisible</b></a> () const</li>
+<li class=fn>int <a href="#minValue"><b>minValue</b></a> () const</li>
+<li class=fn>int <a href="#maxValue"><b>maxValue</b></a> () const</li>
+<li class=fn>void <a href="#setMinValue"><b>setMinValue</b></a> ( int )</li>
+<li class=fn>void <a href="#setMaxValue"><b>setMaxValue</b></a> ( int )</li>
+<li class=fn>int <a href="#lineStep"><b>lineStep</b></a> () const</li>
+<li class=fn>int <a href="#pageStep"><b>pageStep</b></a> () const</li>
+<li class=fn>void <a href="#setLineStep"><b>setLineStep</b></a> ( int )</li>
+<li class=fn>void <a href="#setPageStep"><b>setPageStep</b></a> ( int )</li>
+<li class=fn>int <a href="#value"><b>value</b></a> () const</li>
+</ul>
+<h2>Public Slots</h2>
+<ul>
+<li class=fn>virtual void <a href="#setValue"><b>setValue</b></a> ( int )</li>
+<li class=fn>void <a href="#addLine"><b>addLine</b></a> ()</li>
+<li class=fn>void <a href="#subtractLine"><b>subtractLine</b></a> ()</li>
+<li class=fn>void <a href="#addPage"><b>addPage</b></a> ()</li>
+<li class=fn>void <a href="#subtractPage"><b>subtractPage</b></a> ()</li>
+<li class=fn>virtual void <a href="#setNotchesVisible"><b>setNotchesVisible</b></a> ( bool&nbsp;b )</li>
+<li class=fn>virtual void <a href="#setWrapping"><b>setWrapping</b></a> ( bool&nbsp;on )</li>
+<li class=fn>virtual void <a href="#setTracking"><b>setTracking</b></a> ( bool&nbsp;enable )</li>
+</ul>
+<h2>Signals</h2>
+<ul>
+<li class=fn>void <a href="#valueChanged"><b>valueChanged</b></a> ( int&nbsp;value )</li>
+<li class=fn>void <a href="#dialPressed"><b>dialPressed</b></a> ()</li>
+<li class=fn>void <a href="#dialMoved"><b>dialMoved</b></a> ( int&nbsp;value )</li>
+<li class=fn>void <a href="#dialReleased"><b>dialReleased</b></a> ()</li>
+</ul>
+<h2>Properties</h2>
+<ul>
+<li class=fn>int <a href="#lineStep-prop"><b>lineStep</b></a>&nbsp;- the current line step</li>
+<li class=fn>int <a href="#maxValue-prop"><b>maxValue</b></a>&nbsp;- the current maximum value</li>
+<li class=fn>int <a href="#minValue-prop"><b>minValue</b></a>&nbsp;- the current minimum value</li>
+<li class=fn>int <a href="#notchSize-prop"><b>notchSize</b></a>&nbsp;- the current notch size &nbsp;<em>(read only)</em></li>
+<li class=fn>double <a href="#notchTarget-prop"><b>notchTarget</b></a>&nbsp;- the target number of pixels between notches</li>
+<li class=fn>bool <a href="#notchesVisible-prop"><b>notchesVisible</b></a>&nbsp;- whether the notches are shown</li>
+<li class=fn>int <a href="#pageStep-prop"><b>pageStep</b></a>&nbsp;- the current page step</li>
+<li class=fn>bool <a href="#tracking-prop"><b>tracking</b></a>&nbsp;- whether tracking is enabled</li>
+<li class=fn>int <a href="#value-prop"><b>value</b></a>&nbsp;- the current dial value</li>
+<li class=fn>bool <a href="#wrapping-prop"><b>wrapping</b></a>&nbsp;- whether wrapping is enabled</li>
+</ul>
+<h2>Protected Members</h2>
+<ul>
+<li class=fn>virtual void <a href="#valueChange"><b>valueChange</b></a> ()</li>
+<li class=fn>virtual void <a href="#rangeChange"><b>rangeChange</b></a> ()</li>
+<li class=fn>virtual void <a href="#repaintScreen"><b>repaintScreen</b></a> ( const&nbsp;QRect&nbsp;*&nbsp;cr = 0 )</li>
+</ul>
+<hr><a name="details"></a><h2>Detailed Description</h2>
+
+
+<p> The QDial class provides a rounded range control (like a speedometer or potentiometer).
+<p>
+
+<p> QDial is used when the user needs to control a value within a
+program-definable range, and the range either wraps around
+(typically, 0..359 degrees) or the dialog layout needs a square
+widget.
+<p> Both API- and UI-wise, the dial is very similar to a <a href="qslider.html">slider.</a> Indeed, when <a href="#wrapping">wrapping</a>() is FALSE (the default)
+there is no real difference between a slider and a dial. They
+have the same signals, slots and member functions, all of which do
+the same things. Which one you use depends only on your taste
+and on the application.
+<p> The dial initially emits <a href="#valueChanged">valueChanged</a>() signals continuously while
+the slider is being moved; you can make it emit the signal less
+often by calling <a href="#setTracking">setTracking</a>(FALSE). <a href="#dialMoved">dialMoved</a>() is emitted
+continuously even when <a href="#tracking">tracking</a>() is FALSE.
+<p> The slider also emits <a href="#dialPressed">dialPressed</a>() and <a href="#dialReleased">dialReleased</a>() signals
+when the mouse button is pressed and released. But note that the
+dial's value can change without these signals being emitted; the
+keyboard and wheel can be used to change the value.
+<p> Unlike the slider, QDial attempts to draw a "nice" number of
+notches rather than one per <a href="#lineStep">lineStep</a>(). If possible, the number
+of notches drawn is one per lineStep(), but if there aren't enough
+pixels to draw every one, QDial will draw every second, third
+etc., notch. <a href="#notchSize">notchSize</a>() returns the number of units per notch,
+hopefully a multiple of lineStep(); <a href="#setNotchTarget">setNotchTarget</a>() sets the
+target distance between neighbouring notches in pixels. The
+default is 3.75 pixels.
+<p> Like the slider, the dial makes the <a href="qrangecontrol.html">QRangeControl</a> functions
+<a href="#setValue">setValue</a>(), <a href="#addLine">addLine</a>(), <a href="#subtractLine">subtractLine</a>(), <a href="#addPage">addPage</a>() and
+<a href="#subtractPage">subtractPage</a>() available as slots.
+<p> The dial's keyboard interface is fairly simple: The left/up and
+right/down arrow keys move by lineStep(), page up and page down by
+<a href="#pageStep">pageStep</a>() and Home and End to <a href="#minValue">minValue</a>() and <a href="#maxValue">maxValue</a>().
+<p> <img src=qdial-m.png> <img src=qdial-w.png>
+<p> <p>See also <a href="qscrollbar.html">QScrollBar</a>, <a href="qspinbox.html">QSpinBox</a>, <a href="guibooks.html#fowler">GUI Design Handbook: Slider</a>, and <a href="basic.html">Basic Widgets</a>.
+
+<hr><h2>Member Function Documentation</h2>
+<h3 class=fn><a name="QDial"></a>QDial::QDial ( <a href="qwidget.html">QWidget</a>&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0, WFlags&nbsp;f = 0 )
+</h3>
+Constructs a dial called <em>name</em> with parent <em>parent</em>. <em>f</em> is
+propagated to the <a href="qwidget.html">QWidget</a> constructor. It has the default range of
+a <a href="qrangecontrol.html">QRangeControl</a>.
+
+<h3 class=fn><a name="QDial-2"></a>QDial::QDial ( int&nbsp;minValue, int&nbsp;maxValue, int&nbsp;pageStep, int&nbsp;value, <a href="qwidget.html">QWidget</a>&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0 )
+</h3>
+Constructs a dial called <em>name</em> with parent <em>parent</em>. The dial's
+value can never be smaller than <em>minValue</em> or greater than <em>maxValue</em>. Its page step size is <em>pageStep</em>, and its initial value
+is <em>value</em>.
+<p> <em>value</em> is forced to be within the legal range.
+
+<h3 class=fn><a name="~QDial"></a>QDial::~QDial ()
+</h3>
+Destroys the dial.
+
+<h3 class=fn>void <a name="addLine"></a>QDial::addLine ()<tt> [slot]</tt>
+</h3>
+Increments the dial's <a href="#value">value</a>() by one <a href="#lineStep">lineStep</a>().
+
+<h3 class=fn>void <a name="addPage"></a>QDial::addPage ()<tt> [slot]</tt>
+</h3>
+Increments the dial's <a href="#value">value</a>() by one <a href="#pageStep">pageStep</a>() of steps.
+
+<h3 class=fn>void <a name="dialMoved"></a>QDial::dialMoved ( int&nbsp;value )<tt> [signal]</tt>
+</h3>
+
+<p> This signal is emitted whenever the dial <em>value</em> changes. The
+frequency of this signal is <em>not</em> influenced by <a href="#setTracking">setTracking</a>().
+<p> <p>See also <a href="#valueChanged">valueChanged</a>().
+
+<h3 class=fn>void <a name="dialPressed"></a>QDial::dialPressed ()<tt> [signal]</tt>
+</h3>
+
+<p> This signal is emitted when the user begins mouse interaction with
+the dial.
+<p> <p>See also <a href="#dialReleased">dialReleased</a>().
+
+<h3 class=fn>void <a name="dialReleased"></a>QDial::dialReleased ()<tt> [signal]</tt>
+</h3>
+
+<p> This signal is emitted when the user ends mouse interaction with
+the dial.
+<p> <p>See also <a href="#dialPressed">dialPressed</a>().
+
+<h3 class=fn>int <a name="lineStep"></a>QDial::lineStep () const
+</h3><p>Returns the current line step.
+See the <a href="qdial.html#lineStep-prop">"lineStep"</a> property for details.
+<h3 class=fn>int <a name="maxValue"></a>QDial::maxValue () const
+</h3><p>Returns the current maximum value.
+See the <a href="qdial.html#maxValue-prop">"maxValue"</a> property for details.
+<h3 class=fn>int <a name="minValue"></a>QDial::minValue () const
+</h3><p>Returns the current minimum value.
+See the <a href="qdial.html#minValue-prop">"minValue"</a> property for details.
+<h3 class=fn>int <a name="notchSize"></a>QDial::notchSize () const
+</h3><p>Returns the current notch size.
+See the <a href="qdial.html#notchSize-prop">"notchSize"</a> property for details.
+<h3 class=fn>double <a name="notchTarget"></a>QDial::notchTarget () const
+</h3><p>Returns the target number of pixels between notches.
+See the <a href="qdial.html#notchTarget-prop">"notchTarget"</a> property for details.
+<h3 class=fn>bool <a name="notchesVisible"></a>QDial::notchesVisible () const
+</h3><p>Returns TRUE if the notches are shown; otherwise returns FALSE.
+See the <a href="qdial.html#notchesVisible-prop">"notchesVisible"</a> property for details.
+<h3 class=fn>int <a name="pageStep"></a>QDial::pageStep () const
+</h3><p>Returns the current page step.
+See the <a href="qdial.html#pageStep-prop">"pageStep"</a> property for details.
+<h3 class=fn>void <a name="rangeChange"></a>QDial::rangeChange ()<tt> [virtual protected]</tt>
+</h3>
+Reimplemented to ensure tick-marks are consistent with the new range.
+
+<p>Reimplemented from <a href="qrangecontrol.html#rangeChange">QRangeControl</a>.
+<h3 class=fn>void <a name="repaintScreen"></a>QDial::repaintScreen ( const&nbsp;<a href="qrect.html">QRect</a>&nbsp;*&nbsp;cr = 0 )<tt> [virtual protected]</tt>
+</h3>
+Paints the dial using clip region <em>cr</em>.
+
+<h3 class=fn>void <a name="setLineStep"></a>QDial::setLineStep ( int )
+</h3><p>Sets the current line step.
+See the <a href="qdial.html#lineStep-prop">"lineStep"</a> property for details.
+<h3 class=fn>void <a name="setMaxValue"></a>QDial::setMaxValue ( int )
+</h3><p>Sets the current maximum value.
+See the <a href="qdial.html#maxValue-prop">"maxValue"</a> property for details.
+<h3 class=fn>void <a name="setMinValue"></a>QDial::setMinValue ( int )
+</h3><p>Sets the current minimum value.
+See the <a href="qdial.html#minValue-prop">"minValue"</a> property for details.
+<h3 class=fn>void <a name="setNotchTarget"></a>QDial::setNotchTarget ( double )<tt> [virtual]</tt>
+</h3><p>Sets the target number of pixels between notches.
+See the <a href="qdial.html#notchTarget-prop">"notchTarget"</a> property for details.
+<h3 class=fn>void <a name="setNotchesVisible"></a>QDial::setNotchesVisible ( bool&nbsp;b )<tt> [virtual slot]</tt>
+</h3><p>Sets whether the notches are shown to <em>b</em>.
+See the <a href="qdial.html#notchesVisible-prop">"notchesVisible"</a> property for details.
+<h3 class=fn>void <a name="setPageStep"></a>QDial::setPageStep ( int )
+</h3><p>Sets the current page step.
+See the <a href="qdial.html#pageStep-prop">"pageStep"</a> property for details.
+<h3 class=fn>void <a name="setTracking"></a>QDial::setTracking ( bool&nbsp;enable )<tt> [virtual slot]</tt>
+</h3><p>Sets whether tracking is enabled to <em>enable</em>.
+See the <a href="qdial.html#tracking-prop">"tracking"</a> property for details.
+<h3 class=fn>void <a name="setValue"></a>QDial::setValue ( int )<tt> [virtual slot]</tt>
+</h3><p>Sets the current dial value.
+See the <a href="qdial.html#value-prop">"value"</a> property for details.
+<h3 class=fn>void <a name="setWrapping"></a>QDial::setWrapping ( bool&nbsp;on )<tt> [virtual slot]</tt>
+</h3><p>Sets whether wrapping is enabled to <em>on</em>.
+See the <a href="qdial.html#wrapping-prop">"wrapping"</a> property for details.
+<h3 class=fn>void <a name="subtractLine"></a>QDial::subtractLine ()<tt> [slot]</tt>
+</h3>
+Decrements the dial's <a href="#value">value</a>() by one <a href="#lineStep">lineStep</a>().
+
+<h3 class=fn>void <a name="subtractPage"></a>QDial::subtractPage ()<tt> [slot]</tt>
+</h3>
+Decrements the dial's <a href="#value">value</a>() by one <a href="#pageStep">pageStep</a>() of steps.
+
+<h3 class=fn>bool <a name="tracking"></a>QDial::tracking () const
+</h3><p>Returns TRUE if tracking is enabled; otherwise returns FALSE.
+See the <a href="qdial.html#tracking-prop">"tracking"</a> property for details.
+<h3 class=fn>int <a name="value"></a>QDial::value () const
+</h3><p>Returns the current dial value.
+See the <a href="qdial.html#value-prop">"value"</a> property for details.
+<h3 class=fn>void <a name="valueChange"></a>QDial::valueChange ()<tt> [virtual protected]</tt>
+</h3>
+Reimplemented to ensure the display is correct and to emit the
+<a href="#valueChanged">valueChanged</a>(int) signal when appropriate.
+
+<p>Reimplemented from <a href="qrangecontrol.html#valueChange">QRangeControl</a>.
+<h3 class=fn>void <a name="valueChanged"></a>QDial::valueChanged ( int&nbsp;value )<tt> [signal]</tt>
+</h3>
+
+<p> This signal is emitted whenever the dial's <em>value</em> changes. The
+frequency of this signal is influenced by <a href="#setTracking">setTracking</a>().
+
+<h3 class=fn>bool <a name="wrapping"></a>QDial::wrapping () const
+</h3><p>Returns TRUE if wrapping is enabled; otherwise returns FALSE.
+See the <a href="qdial.html#wrapping-prop">"wrapping"</a> property for details.
+<hr><h2>Property Documentation</h2>
+<h3 class=fn>int <a name="lineStep-prop"></a>lineStep</h3>
+<p>This property holds the current line step.
+<p>setLineStep() calls the virtual <a href="qrangecontrol.html#stepChange">stepChange</a>() function if the new
+line step is different from the previous setting.
+<p> <p>See also <a href="qrangecontrol.html#setSteps">QRangeControl::setSteps</a>(), <a href="#pageStep-prop">pageStep</a>, and <a href="qrangecontrol.html#setRange">setRange</a>().
+
+<p>Set this property's value with <a href="#setLineStep">setLineStep</a>() and get this property's value with <a href="#lineStep">lineStep</a>().
+<h3 class=fn>int <a name="maxValue-prop"></a>maxValue</h3>
+<p>This property holds the current maximum value.
+<p>When setting this property, the <a href="#minValue-prop">QDial::minValue</a> is adjusted if
+necessary to ensure that the range remains valid.
+<p> <p>See also <a href="qrangecontrol.html#setRange">setRange</a>().
+
+<p>Set this property's value with <a href="#setMaxValue">setMaxValue</a>() and get this property's value with <a href="#maxValue">maxValue</a>().
+<h3 class=fn>int <a name="minValue-prop"></a>minValue</h3>
+<p>This property holds the current minimum value.
+<p>When setting this property, the <a href="#maxValue-prop">QDial::maxValue</a> is adjusted if
+necessary to ensure that the range remains valid.
+<p> <p>See also <a href="qrangecontrol.html#setRange">setRange</a>().
+
+<p>Set this property's value with <a href="#setMinValue">setMinValue</a>() and get this property's value with <a href="#minValue">minValue</a>().
+<h3 class=fn>int <a name="notchSize-prop"></a>notchSize</h3>
+<p>This property holds the current notch size.
+<p>The notch size is in range control units, not pixels, and if
+possible it is a multiple of <a href="#lineStep">lineStep</a>() that results in an
+on-screen notch size near <a href="#notchTarget">notchTarget</a>().
+<p> <p>See also <a href="#notchTarget-prop">notchTarget</a> and <a href="#lineStep-prop">lineStep</a>.
+
+<p>Get this property's value with <a href="#notchSize">notchSize</a>().
+<h3 class=fn>double <a name="notchTarget-prop"></a>notchTarget</h3>
+<p>This property holds the target number of pixels between notches.
+<p>The notch target is the number of pixels QDial attempts to put
+between each notch.
+<p> The actual size may differ from the target size.
+
+<p>Set this property's value with <a href="#setNotchTarget">setNotchTarget</a>() and get this property's value with <a href="#notchTarget">notchTarget</a>().
+<h3 class=fn>bool <a name="notchesVisible-prop"></a>notchesVisible</h3>
+<p>This property holds whether the notches are shown.
+<p>If TRUE, the notches are shown. If FALSE (the default) notches are
+not shown.
+
+<p>Set this property's value with <a href="#setNotchesVisible">setNotchesVisible</a>() and get this property's value with <a href="#notchesVisible">notchesVisible</a>().
+<h3 class=fn>int <a name="pageStep-prop"></a>pageStep</h3>
+<p>This property holds the current page step.
+<p>setPageStep() calls the virtual <a href="qrangecontrol.html#stepChange">stepChange</a>() function if the new
+page step is different from the previous setting.
+<p> <p>See also <a href="qrangecontrol.html#stepChange">stepChange</a>().
+
+<p>Set this property's value with <a href="#setPageStep">setPageStep</a>() and get this property's value with <a href="#pageStep">pageStep</a>().
+<h3 class=fn>bool <a name="tracking-prop"></a>tracking</h3>
+<p>This property holds whether tracking is enabled.
+<p>If TRUE (the default), tracking is enabled. This means that the
+arrow can be moved using the mouse; otherwise the arrow cannot be
+moved with the mouse.
+
+<p>Set this property's value with <a href="#setTracking">setTracking</a>() and get this property's value with <a href="#tracking">tracking</a>().
+<h3 class=fn>int <a name="value-prop"></a>value</h3>
+<p>This property holds the current dial value.
+<p>This is guaranteed to be within the range
+<a href="#minValue-prop">QDial::minValue</a>..<a href="#maxValue-prop">QDial::maxValue</a>.
+<p> <p>See also <a href="#minValue-prop">minValue</a> and <a href="#maxValue-prop">maxValue</a>.
+
+<p>Set this property's value with <a href="#setValue">setValue</a>() and get this property's value with <a href="#value">value</a>().
+<h3 class=fn>bool <a name="wrapping-prop"></a>wrapping</h3>
+<p>This property holds whether wrapping is enabled.
+<p>If TRUE, wrapping is enabled. This means that the arrow can be
+turned around 360°. Otherwise there is some space at the bottom of
+the dial which is skipped by the arrow.
+<p> This property's default is FALSE.
+
+<p>Set this property's value with <a href="#setWrapping">setWrapping</a>() and get this property's value with <a href="#wrapping">wrapping</a>().
+<!-- eof -->
+<hr><p>
+This file is part of the <a href="index.html">Qt toolkit</a>.
+Copyright &copy; 1995-2007
+<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
+<table width=100% cellspacing=0 border=0><tr>
+<td>Copyright &copy; 2007
+<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
+<td align=right><div align=right>Qt 3.3.8</div>
+</table></div></address></body>
+</html>