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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Qwt User's Guide: QwtScaleArithmetic Class Reference</title>
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<div class="header">
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<a href="#pub-static-methods">Static Public Member Functions</a> </div>
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<h1>QwtScaleArithmetic Class Reference</h1> </div>
</div>
<div class="contents">
<!-- doxytag: class="QwtScaleArithmetic" -->
<p>Arithmetic including a tolerance.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="qwt__scale__engine_8h_source.html">qwt_scale_engine.h</a>></code></p>
<p><a href="class_qwt_scale_arithmetic-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_arithmetic.html#a5768ab1c30f4fa8f02e3bb83f50fac02">ceil125</a> (double x)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_arithmetic.html#a86da4fc0928457d03201d8b520d7d816">ceilEps</a> (double value, double intervalSize)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_arithmetic.html#a6c6f982022550fba9ccee034f87461ce">compareEps</a> (double value1, double value2, double intervalSize)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_arithmetic.html#ae5f0415105b2a97cccb93f3da9ddaead">divideEps</a> (double interval, double steps)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_arithmetic.html#a0cf6b5993a700cf0f00175486bd57b5b">floor125</a> (double x)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_scale_arithmetic.html#a924d97f2e5db236f43f4d65e430e09c1">floorEps</a> (double value, double intervalSize)</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Arithmetic including a tolerance. </p>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a5768ab1c30f4fa8f02e3bb83f50fac02"></a><!-- doxytag: member="QwtScaleArithmetic::ceil125" ref="a5768ab1c30f4fa8f02e3bb83f50fac02" args="(double x)" -->
<div class="memitem">
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<td class="memname">double QwtScaleArithmetic::ceil125 </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>x</em></td><td>)</td>
<td><code> [static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Find the smallest value out of {1,2,5}*10^n with an integer number n which is greater than or equal to x</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">x</td><td>Input value </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a86da4fc0928457d03201d8b520d7d816"></a><!-- doxytag: member="QwtScaleArithmetic::ceilEps" ref="a86da4fc0928457d03201d8b520d7d816" args="(double value, double intervalSize)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">double QwtScaleArithmetic::ceilEps </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>intervalSize</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Ceil a value, relative to an interval</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">value</td><td>Value to ceil </td></tr>
<tr><td class="paramname">intervalSize</td><td>Interval size</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_arithmetic.html#a924d97f2e5db236f43f4d65e430e09c1">floorEps()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="a6c6f982022550fba9ccee034f87461ce"></a><!-- doxytag: member="QwtScaleArithmetic::compareEps" ref="a6c6f982022550fba9ccee034f87461ce" args="(double value1, double value2, double intervalSize)" -->
<div class="memitem">
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<td class="memname">int QwtScaleArithmetic::compareEps </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>value1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>value2</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>intervalSize</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Compare 2 values, relative to an interval. </p>
<p>Values are "equal", when : <img class="formulaInl" alt="$\cdot value2 - value1 <= abs(intervalSize * 10e^{-6})$" src="form_0.png"/></p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">value1</td><td>First value to compare </td></tr>
<tr><td class="paramname">value2</td><td>Second value to compare </td></tr>
<tr><td class="paramname">intervalSize</td><td>interval size</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0: if equal, -1: if value2 > value1, 1: if value1 > value2 </dd></dl>
</div>
</div>
<a class="anchor" id="ae5f0415105b2a97cccb93f3da9ddaead"></a><!-- doxytag: member="QwtScaleArithmetic::divideEps" ref="ae5f0415105b2a97cccb93f3da9ddaead" args="(double interval, double steps)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname">double QwtScaleArithmetic::divideEps </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>intervalSize</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>numSteps</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Divide an interval into steps. </p>
<p><img class="formulaInl" alt="$stepSize = (intervalSize - intervalSize * 10e^{-6}) / numSteps$" src="form_1.png"/></p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">intervalSize</td><td>Interval size </td></tr>
<tr><td class="paramname">numSteps</td><td>Number of steps </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Step size </dd></dl>
</div>
</div>
<a class="anchor" id="a0cf6b5993a700cf0f00175486bd57b5b"></a><!-- doxytag: member="QwtScaleArithmetic::floor125" ref="a0cf6b5993a700cf0f00175486bd57b5b" args="(double x)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">double QwtScaleArithmetic::floor125 </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>x</em></td><td>)</td>
<td><code> [static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Find the largest value out of {1,2,5}*10^n with an integer number n which is smaller than or equal to x. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">x</td><td>Input value </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a924d97f2e5db236f43f4d65e430e09c1"></a><!-- doxytag: member="QwtScaleArithmetic::floorEps" ref="a924d97f2e5db236f43f4d65e430e09c1" args="(double value, double intervalSize)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">double QwtScaleArithmetic::floorEps </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>intervalSize</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Floor a value, relative to an interval</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">value</td><td>Value to floor </td></tr>
<tr><td class="paramname">intervalSize</td><td>Interval size</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_scale_arithmetic.html#a924d97f2e5db236f43f4d65e430e09c1">floorEps()</a> </dd></dl>
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