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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: qwt_scale_engine.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><h1>qwt_scale_engine.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span><a name="l00002"></a>00002 <span class="comment"> * Qwt Widget Library</span><a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span><a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span><a name="l00005"></a>00005 <span class="comment"> * </span><a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span><a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span><a name="l00008"></a>00008 <span class="comment"> *****************************************************************************/</span><a name="l00009"></a>00009 <a name="l00010"></a>00010 <span class="preprocessor">#ifndef QWT_SCALE_ENGINE_H</span><a name="l00011"></a>00011 <span class="preprocessor"></span><span class="preprocessor">#define QWT_SCALE_ENGINE_H</span><a name="l00012"></a>00012 <span class="preprocessor"></span><a name="l00013"></a>00013 <span class="preprocessor">#include "qwt_global.h"</span><a name="l00014"></a>00014 <span class="preprocessor">#include "qwt_scale_div.h"</span><a name="l00015"></a>00015 <span class="preprocessor">#include "qwt_double_interval.h"</span><a name="l00016"></a>00016 <a name="l00017"></a>00017 <span class="keyword">class </span><a class="code" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a>;<a name="l00018"></a>00018 <a name="l00022"></a><a class="code" href="class_qwt_scale_arithmetic.html">00022</a> <span class="keyword">class </span>QWT_EXPORT <a class="code" href="class_qwt_scale_arithmetic.html">QwtScaleArithmetic</a><a name="l00023"></a>00023 {<a name="l00024"></a>00024 <span class="keyword">public</span>:<a name="l00025"></a>00025 <span class="keyword">static</span> <span class="keywordtype">int</span> compareEps(<a name="l00026"></a>00026 <span class="keywordtype">double</span> value1, <span class="keywordtype">double</span> value2, <span class="keywordtype">double</span> intervalSize);<a name="l00027"></a>00027 <a name="l00028"></a>00028 <span class="keyword">static</span> <span class="keywordtype">double</span> ceilEps(<span class="keywordtype">double</span> value, <span class="keywordtype">double</span> intervalSize);<a name="l00029"></a>00029 <span class="keyword">static</span> <span class="keywordtype">double</span> floorEps(<span class="keywordtype">double</span> value, <span class="keywordtype">double</span> intervalSize);<a name="l00030"></a>00030 <a name="l00031"></a>00031 <span class="keyword">static</span> <span class="keywordtype">double</span> divideEps(<span class="keywordtype">double</span> interval, <span class="keywordtype">double</span> steps);<a name="l00032"></a>00032 <a name="l00033"></a>00033 <span class="keyword">static</span> <span class="keywordtype">double</span> ceil125(<span class="keywordtype">double</span> x);<a name="l00034"></a>00034 <span class="keyword">static</span> <span class="keywordtype">double</span> floor125(<span class="keywordtype">double</span> x);<a name="l00035"></a>00035 };<a name="l00036"></a>00036 <a name="l00050"></a><a class="code" href="class_qwt_scale_engine.html">00050</a> <span class="keyword">class </span>QWT_EXPORT QwtScaleEngine<a name="l00051"></a>00051 {<a name="l00052"></a>00052 <span class="keyword">public</span>:<a name="l00054"></a><a class="code" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">00054</a> <span class="keyword">enum</span> <a class="code" href="class_qwt_scale_engine.html#7548418e0896d75eec164bfa2ba3ff5f">Attribute</a><a name="l00055"></a>00055 {<a name="l00056"></a>00056 NoAttribute = 0,<a name="l00057"></a>00057 IncludeReference = 1, <a name="l00058"></a>00058 Symmetric = 2, <a name="l00059"></a>00059 Floating = 4,<a name="l00060"></a>00060 Inverted = 8 <a name="l00061"></a>00061 };<a name="l00062"></a>00062 <a name="l00063"></a>00063 <span class="keyword">explicit</span> QwtScaleEngine();<a name="l00064"></a>00064 <span class="keyword">virtual</span> ~QwtScaleEngine();<a name="l00065"></a>00065 <a name="l00066"></a>00066 <span class="keywordtype">void</span> setAttribute(Attribute, <span class="keywordtype">bool</span> on = <span class="keyword">true</span>);<a name="l00067"></a>00067 <span class="keywordtype">bool</span> testAttribute(Attribute) <span class="keyword">const</span>;<a name="l00068"></a>00068 <a name="l00069"></a>00069 <span class="keywordtype">void</span> setAttributes(<span class="keywordtype">int</span>);<a name="l00070"></a>00070 <span class="keywordtype">int</span> attributes() <span class="keyword">const</span>;<a name="l00071"></a>00071 <a name="l00072"></a>00072 <span class="keywordtype">void</span> setReference(<span class="keywordtype">double</span> reference);<a name="l00073"></a>00073 <span class="keywordtype">double</span> reference() <span class="keyword">const</span>;<a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="keywordtype">void</span> setMargins(<span class="keywordtype">double</span> m1, <span class="keywordtype">double</span> m2);<a name="l00076"></a>00076 <span class="keywordtype">double</span> loMargin() <span class="keyword">const</span>;<a name="l00077"></a>00077 <span class="keywordtype">double</span> hiMargin() <span class="keyword">const</span>;<a name="l00078"></a>00078 <a name="l00087"></a>00087 <span class="keyword">virtual</span> <span class="keywordtype">void</span> autoScale(<span class="keywordtype">int</span> maxNumSteps, <a name="l00088"></a>00088 <span class="keywordtype">double</span> &x1, <span class="keywordtype">double</span> &x2, <span class="keywordtype">double</span> &stepSize) <span class="keyword">const </span>= 0;<a name="l00089"></a>00089 <a name="l00100"></a>00100 <span class="keyword">virtual</span> <a class="code" href="class_qwt_scale_div.html">QwtScaleDiv</a> divideScale(<span class="keywordtype">double</span> x1, <span class="keywordtype">double</span> x2,<a name="l00101"></a>00101 <span class="keywordtype">int</span> maxMajSteps, <span class="keywordtype">int</span> maxMinSteps, <a name="l00102"></a>00102 <span class="keywordtype">double</span> stepSize = 0.0) <span class="keyword">const </span>= 0;<a name="l00103"></a>00103 <a name="l00105"></a>00105 <span class="keyword">virtual</span> <a class="code" href="class_qwt_scale_transformation.html">QwtScaleTransformation</a> *transformation() <span class="keyword">const </span>= 0;⌨️ 快捷键说明
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