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<title>Qwt User's Guide: qwt_dimap.cpp Source File</title>
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<h1>qwt_dimap.cpp</h1><pre class="fragment"><div>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span>
00002 <span class="comment"> * Qwt Widget Library</span>
00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span>
00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span>
00005 <span class="comment"> * </span>
00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span>
00008 <span class="comment"> *****************************************************************************/</span>
00009
00010 <span class="preprocessor">#include "qwt_dimap.h"</span>
00011
00012 QT_STATIC_CONST_IMPL <span class="keywordtype">double</span> QwtDiMap::LogMin = 1.0e-150;
00013 QT_STATIC_CONST_IMPL <span class="keywordtype">double</span> QwtDiMap::LogMax = 1.0e150;
00014
<a name="l00020"></a><a class="code" href="class_qwt_di_map.html#a0">00020</a> <a class="code" href="class_qwt_di_map.html#a0">QwtDiMap::QwtDiMap</a>():
00021 d_x1(0.0),
00022 d_x2(1.0),
00023 d_y1(0),
00024 d_y2(1),
00025 d_cnv(1.0),
00026 d_log(FALSE)
00027 {
00028 }
00029
00030
<a name="l00043"></a><a class="code" href="class_qwt_di_map.html#a1">00043</a> <a class="code" href="class_qwt_di_map.html#a0">QwtDiMap::QwtDiMap</a>(<span class="keywordtype">int</span> i1, <span class="keywordtype">int</span> i2, <span class="keywordtype">double</span> d1, <span class="keywordtype">double</span> d2, <span class="keywordtype">bool</span> logarithmic)
00044 {
00045 <span class="comment">// setIntRange(i1, i2) calls newFactor() with uninitialized memory</span>
00046 d_y1 = i1;
00047 d_y2 = i2;
00048 <a class="code" href="class_qwt_di_map.html#a6">setDblRange</a>(d1, d2, logarithmic);
00049 }
00050
<a name="l00054"></a><a class="code" href="class_qwt_di_map.html#a2">00054</a> <a class="code" href="class_qwt_di_map.html#a2">QwtDiMap::~QwtDiMap</a>()
00055 {
00056 }
00057
<a name="l00063"></a><a class="code" href="class_qwt_di_map.html#a3">00063</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_di_map.html#a3">QwtDiMap::contains</a>(<span class="keywordtype">double</span> x)<span class="keyword"> const</span>
00064 <span class="keyword"></span>{
00065 <span class="keywordflow">return</span> ( (x >= QMIN(d_x1, d_x2)) && (x <= QMAX(d_x1, d_x2)));
00066 }
00067
<a name="l00073"></a><a class="code" href="class_qwt_di_map.html#a4">00073</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_di_map.html#a3">QwtDiMap::contains</a>(<span class="keywordtype">int</span> x)<span class="keyword"> const</span>
00074 <span class="keyword"></span>{
00075 <span class="keywordflow">return</span> ( (x >= QMIN(d_y1, d_y2)) && (x <= QMAX(d_y1, d_y2)));
00076 }
00077
<a name="l00084"></a><a class="code" href="class_qwt_di_map.html#a6">00084</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_di_map.html#a6">QwtDiMap::setDblRange</a>(<span class="keywordtype">double</span> d1, <span class="keywordtype">double</span> d2, <span class="keywordtype">bool</span> lg)
00085 {
00086 <span class="keywordflow">if</span> (lg)
00087 {
00088 d_log = TRUE;
00089 <span class="keywordflow">if</span> (d1 < LogMin)
00090 d1 = LogMin;
00091 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (d1 > LogMax)
00092 d1 = LogMax;
00093
00094 <span class="keywordflow">if</span> (d2 < LogMin)
00095 d2 = LogMin;
00096 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (d2 > LogMax)
00097 d2 = LogMax;
00098
00099 d_x1 = log(d1);
00100 d_x2 = log(d2);
00101 }
00102 <span class="keywordflow">else</span>
00103 {
00104 d_log = FALSE;
00105 d_x1 = d1;
00106 d_x2 = d2;
00107 }
00108 newFactor();
00109 }
00110
<a name="l00116"></a><a class="code" href="class_qwt_di_map.html#a5">00116</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_di_map.html#a5">QwtDiMap::setIntRange</a>(<span class="keywordtype">int</span> i1, <span class="keywordtype">int</span> i2)
00117 {
00118 d_y1 = i1;
00119 d_y2 = i2;
00120 newFactor();
00121 }
00122
<a name="l00132"></a><a class="code" href="class_qwt_di_map.html#a8">00132</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_di_map.html#a8">QwtDiMap::invTransform</a>(<span class="keywordtype">int</span> y)<span class="keyword"> const </span>
00133 <span class="keyword"></span>{
00134 <span class="keywordflow">if</span> (d_cnv == 0.0)
00135 <span class="keywordflow">return</span> 0.0;
00136 <span class="keywordflow">else</span>
00137 {
00138 <span class="keywordflow">if</span>(d_log)
00139 <span class="keywordflow">return</span> exp(d_x1 + <span class="keywordtype">double</span>(y - d_y1) / d_cnv );
00140 <span class="keywordflow">else</span>
00141 <span class="keywordflow">return</span> ( d_x1 + double(y - d_y1) / d_cnv );
00142 }
00143 }
00144
<a name="l00155"></a><a class="code" href="class_qwt_di_map.html#a9">00155</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_di_map.html#a9">QwtDiMap::limTransform</a>(<span class="keywordtype">double</span> x)<span class="keyword"> const</span>
00156 <span class="keyword"></span>{
00157 <span class="keywordflow">if</span> (d_log) {
00158 <span class="keywordflow">if</span> (x > LogMax)
00159 x = LogMax;
00160 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x < LogMin)
00161 x = LogMin;
00162 x = log(x);
00163 }
00164
00165 <span class="keywordflow">if</span> ( x > qwtMax(d_x1, d_x2) )
00166 x = qwtMax(d_x1, d_x2);
00167 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( x < qwtMin(d_x1, d_x2))
00168 x = qwtMin(d_x1, d_x2);
00169
00170 <span class="keywordflow">return</span> d_log ? <a class="code" href="class_qwt_di_map.html#a7">transform</a>(exp(x)) : <a class="code" href="class_qwt_di_map.html#a7">transform</a>(x);
00171 }
00172
<a name="l00185"></a><a class="code" href="class_qwt_di_map.html#a10">00185</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_di_map.html#a10">QwtDiMap::xTransform</a>(<span class="keywordtype">double</span> x)<span class="keyword"> const</span>
00186 <span class="keyword"></span>{
00187 <span class="keywordtype">double</span> rv;
00188
00189 <span class="keywordflow">if</span> (d_log)
00190 rv = double(d_y1) + (log(x) - d_x1) * d_cnv;
00191 <span class="keywordflow">else</span>
00192 rv = double(d_y1) + (x - d_x1) * d_cnv;
00193
00194 <span class="keywordflow">return</span> rv;
00195 }
00196
00197
00201 <span class="keywordtype">void</span> QwtDiMap::newFactor()
00202 {
00203 <span class="keywordflow">if</span> (d_x2 != d_x1)
00204 d_cnv = double(d_y2 - d_y1) / (d_x2 - d_x1);
00205 <span class="keywordflow">else</span>
00206 d_cnv = 0.0;
00207 }
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:20 2004 for Qwt User's Guide by
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